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1
Loh, Z. M., R. M. Law, K. D. Haynes, P. B. Krummel, L. P. Steele, P. J. Fraser, S. Chambers e A. Williams. "Simulations of atmospheric methane for Cape Grim, Tasmania, to constrain South East Australian methane emissions". Atmospheric Chemistry and Physics Discussions 14, n. 15 (19 agosto 2014): 21189–221. http://dx.doi.org/10.5194/acpd-14-21189-2014.
Testo completoAbstract (sommario):
Abstract. This study uses two climate models and six scenarios of prescribed methane emissions to compare modelled and observed atmospheric methane between 1994 and 2007, for Cape Grim, Australia (40.7° S, 144.7° E). The model simulations follow the TransCom-CH4 protocol and use the Australian Community Climate and Earth System Simulator (ACCESS) and the CSIRO Conformal-Cubic Atmospheric Model (CCAM). Radon is also simulated and used to reduce the impact of transport differences between the models and observations. Comparisons are made for air samples that have traversed the Australian continent. All six emission scenarios give modelled concentrations that are broadly consistent with those observed. There are three notable mismatches, however. Firstly, scenarios that incorporate interannually varying biomass burning emissions produce anomalously high methane concentrations at Cape Grim at times of large fire events in southeastern Australia, most likely due to the fire methane emissions being unrealistically input into the lowest model level. Secondly, scenarios with wetland methane emissions in the austral winter overestimate methane concentrations at Cape Grim during wintertime while scenarios without winter wetland emissions perform better. Finally, all scenarios fail to represent a methane source in austral spring implied by the observations. It is possible that the timing of wetland emissions in the scenarios is incorrect with recent satellite measurements suggesting an austral spring (September-October-November), rather than winter, maximum for wetland emissions.
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Boon, Paul I., Kerri L. Muller e George G. Ganf. "Methane emissions from diverse wetlands in south-eastern Australia". SIL Proceedings, 1922-2010 27, n. 3 (novembre 2000): 1382–86. http://dx.doi.org/10.1080/03680770.1998.11901462.
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Bai, M., S. Muir, D. Rowell, J. Hill, D. Chen, T. Naylor, F. Phillips, T. Denmead, D. Griffiths e R. Edis. "Quantification of greenhouse gas emissions from a beef feedlot system in south-east Australia during summer conditions". Proceedings of the British Society of Animal Science 2009 (aprile 2009): 20. http://dx.doi.org/10.1017/s1752756200028593.
Testo completoAbstract (sommario):
Feedlot management systems for beef cattle are becoming a more common practice in Australia reflecting opportunities to ensure quality of product whilst maintaining cost efficiencies within production. However, feedlot systems have been identified as point sources of greenhouse gases emissions (GGE: methane, nitrous oxide and the indirect greenhouse gas ammonia). It has been estimated that feedlot systems contribute 3.5% of total direct methane emissions (Alford et al. 2006), and 30% of total emissions from livestock wastes. Furthermore, approximately 1% of total N2O emissions from agriculture are attributed to livestock. This paper reports methane, N2O and NH3 emissions from an Australian feedlot system managed under summer climatic conditions. It compares actual measured emissions with estimated from three recognised models used by national governments to estimate total GGE per annum from livestock agriculture.
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Dighton, P. F. "COAL SEAM METHANE—MEETING THE REQUIREMENTS OF BUYERS, FINANCIERS AND REGULATORS". APPEA Journal 40, n. 1 (2000): 751. http://dx.doi.org/10.1071/aj99053.
Testo completoAbstract (sommario):
Significant work is taking place in Queensland and New South Wales to make the recovery of natural gas from coal seams (Coal Seam Methane) a viable industry. At this stage there are still some daunting hurdles to overcome. Australian buyers and financiers remain sceptical on resource risk and continuity of supply issues. In the USA commercial production has been taking place for 20 years, but the industry was only able to achieve credibility and viability by relying on tax breaks. Unfortunately, the same type of government incentives are not present in Australia. Whether, in the absence of these incentives, Australian producers can harness the resource on an economic basis remains to be seen.
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Wakelin-King, Gordon. "Highlights and trends in exploration 2009". APPEA Journal 50, n. 1 (2010): 113. http://dx.doi.org/10.1071/aj09008.
Testo completoAbstract (sommario):
2009 saw an overall decrease from high activity from 2008, levelling off in the December quarter as the economy stabilised. Unsurprisingly, most activity was in offshore Western Australia and on coal seam methane (CSM) in Queensland. Highlights include: good results in the Carnarvon and Browse basins for Western Australian operators, interest in Karoon and Conoco-Phillips’ enigmatic Poseidon project, over 180 CSM exploration wells in Queenslandd, and a relatively busy year for Tasmania. Western Australian seismic acquisition approached 10,000 km of 2D and 25,000 km2 of 3D for 38* wells and success rate around 50%. South Australia saw the highest conventional onshore drilling and seismic activity, with good results for 17 wells, while other states saw low activity in this sector. Victoria saw one offshore exploration well and no seismic. Tasmania also saw no new seismic, but saw four exploration wells and encouragement at Rockhopper–1. CSM is picking up in South Australia, and New South Wales saw continued high CSM activity in a historically low-activity region. High success rates suggest two trends: explorers finding value in 3D seismic, and a ‘flight to quality’ as operating costs and poorer access to capital reinforce risk aversion among operators. Elsewhere, geothermal energy helped small cap investors satisfy their appetite for risk outside of the petroleum industry, and results will be watched with great interest. *Numbers are from early public and departmental statistics and may be revised.
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Boon, P. I., e K. Lee. "Methane oxidation in sediments of a floodplain wetland in south‐eastern Australia". Letters in Applied Microbiology 25, n. 2 (agosto 1997): 138–42. http://dx.doi.org/10.1046/j.1472-765x.1997.00189.x.
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Muller, KL, GG Ganf e PI Boon. "Methane flux from beds of Baumea arthrophylla (Nees) Boeckeler and Triglochin procerum R. Br. at Bool Lagoon, South Australia". Marine and Freshwater Research 45, n. 8 (1994): 1543. http://dx.doi.org/10.1071/mf9941543.
Testo completoAbstract (sommario):
The flux of methane from freshwater wetlands is likely to be influenced by the presence of emergent macrophytes. The plants generate an organic loading, which should increase methanogenesis, yet they also aerate the sediment, creating oxic zones inimical to the obligately anaerobic methanogenic bacteria and promoting the oxidation of methane by methanotrophic bacteria. Moreover, emergent plants can act as a conduit for methane to be vented to the atmosphere. Depth profiles of oxygen in beds of B. arthrophylla and T. procerum at Bool Lagoon, South Australia, showed that water at the sediment surface was anoxic during the night but became oxygenated during the latter part of the day. Redox profiles of the sediment gave values that ranged from -50 to +250 mV, indicating a sediment that was not highly reducing. Despite these conditions, the wetlands were sources of significant methane emissions, with total water-atmosphere fluxes ranging from < 0.0 t1o 1.05 mmol m-2 h-1. The presence of B. arthrophylla, but not that of T. procerum, affected the bubble concentration of methane in the sediments. Diel variations in ebullitive or total methane fluxes were not detected, but emissions varied according to water depth and time of year. Treatments that removed macrophytes reduced total methane fluxes to rates approximately equivalent to ebullition, indicating that the plants were acting as a major pathway for the release of methane to the atmosphere. The lack of a clear die1 pattern in emissions suggests that diffusion, rather than convective flow, is the mechanism for this flux through the plants.
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Ngo, Phuong Linh. "THE METHANE UPTAKE CAPACITY OF SOIL GARDEN". Vietnam Journal of Science and Technology 55, n. 4C (24 marzo 2018): 122. http://dx.doi.org/10.15625/2525-2518/55/4c/12140.
Testo completoAbstract (sommario):
Aerobic CH4 oxidation through methanotrophic bacteria is the only terrestrial sink and the only sink that can be altered directly or indirectly by human so far. However, the capacity of this sink is highly variable in different ecosystems depending on four key factors which are soil diffusivity, soil temperature, soil nitrogen status and soil moisture. While many studies in Australia experience the significant inverse correlation between soil moisture and CH4 flux magnitude in temperate forests in Victoria and New South Wales, there is a lack of research about the methane uptake capacity of garden soil. Consequently, we hypothesise that there is a similar pattern of CH4 uptake by garden soil. The aim of this study is to determine the capacity of CH4 oxidation along the soil garden profile. Our study was conducted at a native garden in Burnley Campus of the University of Melbourne, Victoria, Australia. Our results show three main findings. Firstly, garden soil can become a significant sink of CH4. Secondly, there was a significant correlation between soil moisture and the soil CH4 uptake rates. Finally, there was an expansion of the CH4 oxidation layer to deeper soil layers as the soil dries at the surface.
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Akumu, Clement E., Sumith Pathirana, Serwan Baban e Daniel Bucher. "Modeling Methane Emission from Wetlands in North-Eastern New South Wales, Australia Using Landsat ETM+". Remote Sensing 2, n. 5 (17 maggio 2010): 1378–99. http://dx.doi.org/10.3390/rs2051378.
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Kondo, Yutaka, Nobuyuki Takegawa, Yuzo Miyazaki, Malcolm Ko, Makoto Koike, Kazuyuki Kita, Shuji Kawakami et al. "Effects of biomass burning and lightning on atmospheric chemistry over Australia and South-east Asia". International Journal of Wildland Fire 12, n. 4 (2003): 271. http://dx.doi.org/10.1071/wf03014.
Testo completoAbstract (sommario):
In situ aircraft measurements of trace gases and aerosols were made in the boundary layer (BL) and free troposphere (FT) over Indonesia and Australia during the Biomass Burning and Lightning Experiment (BIBLE)-A and B conducted in August–October 1998 and 1999.Concentrations of ozone (O3) and its precursors [CO, reactive nitrogen (NOx), non-methane hydrocarbons (NMHCs)] were measured in these campaigns to identify the sources of NOx and to estimate the effects of biomass burning and lightning on photochemical production of O3. Over Indonesia, in-situ production of NOx by lightning was found to be a major source of reactive nitrogen in the upper troposphere during BIBLE-A. In some circumstances, increases in reactive nitrogen were often associated with enhancements in CO and NMHCs, suggesting that the sources were biomass burning and fossil fuel combustion, followed by upward transport by cumulus convection. Over Australia the levels of O3, CO, reactive nitrogen, and NMHCs were elevated throughout the troposphere compared to those observed in the tropical Pacific. However, the mechanisms responsible for the enhanced concentrations in the BL and FT are distinctly different. The emissions from biomass burning that occurred in northern Australia were restricted to the BL because of strong subsidence in the period. In the FT over Australia, elevated concentrations of O3 and its precursors result from injections of emissions as the air masses travel over Africa, South America, the Indian Ocean, and Indonesia en route to Australia. In all cases, O3 levels in the biomass burning plumes were enhanced due to photochemical production.
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Sturm, K., Z. Yuan, B. Gibbes, U. Werner e A. Grinham. "Methane and nitrous oxide sources and emissions in a subtropical freshwater reservoir, South East Queensland, Australia". Biogeosciences 11, n. 18 (30 settembre 2014): 5245–58. http://dx.doi.org/10.5194/bg-11-5245-2014.
Testo completoAbstract (sommario):
Abstract. Reservoirs have been identified as an important source of non-carbon dioxide (CO2) greenhouse gases with wide ranging fluxes for reported methane (CH4); however, fluxes for nitrous oxide (N2O) are rarely quantified. This study investigates CH4 and N2O sources and emissions in a subtropical freshwater Gold Creek Reservoir, Australia, using a combination of water–air and sediment–water flux measurements and water column and pore water analyses. The reservoir was clearly a source of these gases as surface waters were supersaturated with CH4 and N2O. Atmospheric CH4 fluxes were dominated by ebullition (60 to 99%) relative to diffusive fluxes and ranged from 4.14 × 102 to 3.06 × 105 μmol CH4 m−2 day−1 across the sampling sites. Dissolved CH4 concentrations were highest in the anoxic water column and sediment pore waters (approximately 5 000 000% supersaturated). CH4 production rates of up to 3616 ± 395 μmol CH4 m−2 day−1 were found during sediment incubations in anoxic conditions. These findings are in contrast to N2O where no production was detected during sediment incubations and the highest dissolved N2O concentrations were found in the oxic water column which was 110 to 220% supersaturated with N2O. N2O fluxes to the atmosphere were primarily through the diffusive pathway, mainly driven by diffusive fluxes from the water column and by a minor contribution from sediment diffusion and ebullition. Results suggest that future studies of subtropical reservoirs should monitor CH4 fluxes with an appropriate spatial resolution to ensure capture of ebullition zones, whereas assessment of N2O fluxes should focus on the diffusive pathway.
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Sturm, K., Z. Yuan, B. Gibbes e A. Grinham. "Methane and nitrous oxide sources and emissions in a subtropical freshwater reservoir, south east Queensland, Australia". Biogeosciences Discussions 10, n. 12 (11 dicembre 2013): 19485–508. http://dx.doi.org/10.5194/bgd-10-19485-2013.
Testo completoAbstract (sommario):
Abstract. Reservoirs have been identified as an important source of non-CO2 greenhouse gases, especially methane (CH4). This study investigates CH4 and nitrous oxide (N2O) sources and emissions in a subtropical freshwater reservoir Gold Creek Dam, Australia using a combination of water–atmosphere and sediment–water flux measurements, water column sampling and pore water analysis. The reservoir was clearly a net source as surface waters were supersaturated with CH4 and N2O. CH4 flux rates were one to two orders of magnitude higher than N2O rates when expressed as CO2 equivalents. Atmospheric CH4 fluxes were dominated by ebullition (<60%) relative to diffusive fluxes and ranged from 165 to 6526 mg CO2 eq m−2 d−1. Dissolved CH4 concentrations in sediment pore waters were approximately 5 000 000% supersaturated. However, dissolved N2O concentrations were 140 to 220% supersaturated and generally confined to the water column greatly reducing the likelihood of ebullition. The flux measurements from this study support past findings that demonstrate the potential important contribution of emissions from subtropical reservoirs to overall GHG budgets. Results suggest future efforts to monitor and model emissions that concentrate on quantifying the ebullition pathway for CH4 as this was dominant relative to diffusive fluxes as well as total N2O emissions.
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Bai, Mei, Jianlei Sun, Kithsiri B. Dassanayake, Marcelo A. Benvenutti, Julian Hill, Owen T. Denmead, Thomas Flesch e Deli Chen. "Non-interference measurement of CH4, N2O and NH3 emissions from cattle". Animal Production Science 56, n. 9 (2016): 1496. http://dx.doi.org/10.1071/an14992.
Testo completoAbstract (sommario):
A technique combining open-path Fourier transform infrared spectroscopy with an inverse-dispersion model was used to quantify methane (CH4), nitrous oxide (N2O) and ammonia (NH3) emissions from an isolated cattle pen in south-eastern Australia. Twenty-eight Angus steers (1-year old, initial average liveweight 404 kg) were fed a 60% grain diet and kept in a pen (20 × 20 m) for 41 days. Gas concentrations were measured downwind of the pen using an open-path Fourier transform infrared spectroscopy with a path length of 100 m, having a detection sensitivity of 2, 0.3 and 0.4 ppb for CH4, N2O and NH3, respectively. Daily emission rates were 232, 14 and 192 g/cattle.day for CH4, N2O and NH3, respectively. The measured CH4 emissions were in agreement with predictions based on Australian National Inventory recommendations, however, measured N2O and NH3 emissions were much higher than the predicted values. Extrapolation of our measurements would mean that CH4 and N2O emissions from beef feedlot cattle contribute 3.1% and 5.9% of the Australian agricultural CH4 and N2O emissions, respectively.
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Salmachi, Alireza, Mojtaba Rajabi, Carmine Wainman, Steven Mackie, Peter McCabe, Bronwyn Camac e Christopher Clarkson. "History, Geology, In Situ Stress Pattern, Gas Content and Permeability of Coal Seam Gas Basins in Australia: A Review". Energies 14, n. 9 (5 maggio 2021): 2651. http://dx.doi.org/10.3390/en14092651.
Testo completoAbstract (sommario):
Coal seam gas (CSG), also known as coalbed methane (CBM), is an important source of gas supply to the liquefied natural gas (LNG) exporting facilities in eastern Australia and to the Australian domestic market. In late 2018, Australia became the largest exporter of LNG in the world. 29% of the country’s LNG nameplate capacity is in three east coast facilities that are supplied primarily by coal seam gas. Six geological basins including Bowen, Sydney, Gunnedah, Surat, Cooper and Gloucester host the majority of CSG resources in Australia. The Bowen and Surat basins contain an estimated 40Tcf of CSG whereas other basins contain relatively minor accumulations. In the Cooper Basin of South Australia, thick and laterally extensive Permian deep coal seams (>2 km) are currently underdeveloped resources. Since 2013, gas production exclusively from deep coal seams has been tested as a single add-on fracture stimulation in vertical well completions across the Cooper Basin. The rates and reserves achieved since 2013 demonstrate a robust statistical distribution (>130 hydraulic fracture stages), the mean of which, is economically viable. The geological characteristics including coal rank, thickness and hydrogeology as well as the present-day stress pattern create favourable conditions for CSG production. Detailed analyses of high-resolution borehole image log data reveal that there are major perturbations in maximum horizontal stress (SHmax) orientation, both spatially and with depth in Australian CSG basins, which is critical in hydraulic fracture stimulation and geomechanical modelling. Within a basin, significant variability in gas content and permeability may be observed with depth. The major reasons for such variabilities are coal rank, sealing capacity of overlying formations, measurement methods, thermal effects of magmatic intrusions, geological structures and stress regime. Field studies in Australia show permeability may enhance throughout depletion in CSG fields and the functional form of permeability versus reservoir pressure is exponential, consistent with observations in North American CSG fields.
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Laing, S., C. N. Dee e P. W. Best. "THE OTWAY BASIN". APPEA Journal 29, n. 1 (1989): 417. http://dx.doi.org/10.1071/aj88034.
Testo completoAbstract (sommario):
The Otway Basin covers an area of some 150 000 km2 both onshore and offshore southwestern Victoria and southeastern South Australia. Exploration within the basin is at a moderately mature stage by Australian standards (though immature by world standards), with a well density of one per 1500 km2, including offshore areas.Formation of the Otway Basin commenced in the late Jurassic with the initiation of rifting between Australia and Antarctica. As rifting continued, a number of depositional cycles occurred. Initial deposition comprised fluvio- lacustrine sediments, followed by marine transgressions and associated regressive deltaic cycles. As subsidence continued into the Late Tertiary, a series of marine carbonates and marls were deposited. The Otway Basin is structurally complex as a result of the superposition of a number of tectonic events which occurredboth during and after the development of the basin.The Otway Basin is a proven gas province, with commercial production at Caroline 1 (carbon dioxide) and North Paaratte Field (methane). Although no commercial oil production has yet been established in the basin, oil has been recovered at Port Campbell 4, Lindon 1 and Windermere 1. The presence of excellent reservoir units within the basin, mature source rocks and adequate seals, together with a number of untested play types and favourable economics, augurs well for the prospectivity of the Otway Basin.
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Nara, Hideki, Hiroshi Tanimoto, Yukihiro Nojiri, Hitoshi Mukai, Jiye Zeng, Yasunori Tohjima e Toshinobu Machida. "CO emissions from biomass burning in South-east Asia in the 2006 El Niño year: shipboard and AIRS satellite observations". Environmental Chemistry 8, n. 2 (2011): 213. http://dx.doi.org/10.1071/en10113.
Testo completoAbstract (sommario):
Environmental contextAtmospheric carbon monoxide greatly affects the abundance of environmentally important gases, including methane, hydrochlorofluorocarbons and tropospheric ozone. We present evidence for episodes of CO pollution over the tropical Pacific Ocean resulting from intensive biomass burning in South-east Asia and Northern Australia during the 2006 El Niño year. We discuss the locations of the CO emissions and their long-range transport. AbstractBiomass burning is often associated with climate oscillations. For example, biomass burning in South-east Asia is strongly linked to El Niño–southern oscillation activity. During October and November of the 2006 El Niño year, a substantial increase in CO mixing ratios was detected over the Western tropical Pacific Ocean by shipboard observations routinely operated between Japan and Australia and New Zealand. Combining in-situ measurements, satellite observations, and an air trajectory model simulation, two high CO episodes were identified originating from biomass burning in Borneo, Sumatra, New Guinea, and Northern Australia. Between 15°N and the Equator, marked CO enhancements were encountered associated with a significant correlation between CO and CO2 and between CO and O3. The ΔCO/ΔCO2 ratio observed in the fire plume was considerably high (171 ppbv ppmv–1), suggesting substantial contributions from peat soil burning in Indonesia. In contrast, the ΔO3/ΔCO ratio was only 0.05 ppbv ppbv–1, indicating that net photochemical production of O3 in the plume was negligible during long-range transport in the lower troposphere over the Western tropical North Pacific.
17
Sturm, Katrin, Alistair Grinham, Ursula Werner e Zhiguo Yuan. "Sources and sinks of methane and nitrous oxide in the subtropical Brisbane River estuary, South East Queensland, Australia". Estuarine, Coastal and Shelf Science 168 (gennaio 2016): 10–21. http://dx.doi.org/10.1016/j.ecss.2015.11.002.
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Sebire, Tamara. "PESA 2010 production and development review". APPEA Journal 51, n. 1 (2011): 167. http://dx.doi.org/10.1071/aj10011.
Testo completoAbstract (sommario):
2010 was another busy year for Australian hydrocarbon production and development. Natural gas production was the standout performer with both domestic gas and LNG production increasing by about 5% compared to 2009. Domestic gas output was strong with significant growth in production from the Gippsland Basin, coal seam methane in the Surat-Bowen Basin, and the start-up of the Blacktip gas project in WA. Domestic gas output is set to reach record levels again next year and has strong growth prospects in the future with final investment decisions being taken on coal seam gas projects in Queensland and the Macedon project in WA. Australian LNG production increased 4.5% in 2010 accounting for 34% of Australian hydrocarbon production. LNG production will grow further in 2011 with first gas expected from Pluto LNG project during the year. Oil production was steady in 2010; however, it is set to increase in 2011 with a full year of production from the Van Gogh and Pyrenees projects. Production levels only tell part of the Australian hydrocarbon story. In addition to the proposed domestic gas and oil projects, the combined value of committed and potential LNG projects in Australia has surpassed $100 billion. A highlight of 2010 was the final investment decision on the A$15 bn Queensland Curtis LNG Project (QCLNG). The first phase of QCLNG will consist of two LNG trains with a combined capacity of 8.5 million tonnes per annum, with first LNG exports expected in 2014. QCLNG is the first of many proposed coal seam gas to LNG (CSG-LNG) developments in Queensland. Other CSG-LNG projects reached significant milestones this year. Of particular note is the federal environmental approval of Gladstone LNG and state environmental approval of Australia Pacific LNG. In WA, the Browse LNG project complied with all Browse Basin retention lease conditions and remains on track for a targeted final investment decision in 2012. Other major LNG projects including Ichthys and Wheatstone also continue to make positive progress towards a final investment decision in the next 24 months. Sunrise, Prelude and Bonaparte LNG set a technology milestone in the industry with all three selecting floating LNG (FLNG) as their preferred development concept. 2010 has also seen the emergence of further new technologies in the form of small scale LNG projects for resources previously considered un-commercial. This has opened the door for South Australia and New South Wales to enter the LNG export market in the future. The Australian hydrocarbon industry continues to grow and its global importance, particularly in LNG, reflected by the increasing number of foreign companies entering Australia. In 2010, Shell and PetroChina increased their involvement in the Australian industry purchasing Arrow Energy for A$3.5 bn. CNOOC has increased its involvement in a number of areas, including purchasing a 5–10% stake in QCLNG and investment in CSM exploration through Exoma Energy. GDF Suez and Total have reinvigorated their interests in offshore WA and Petrobras made their first entry into Australia acquiring an interest in exploration acreage offshore WA. 2010 was an active year for Australian hydrocarbon production and development–continued success depends on the successful execution of committed and proposed projects. Escalation of development costs and a looming skills shortage remain the largest risks to the Australian hydrocarbon industry as multiple projects attempt to move forward simultaneously.
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Zindler, C., A. Bracher, C. A. Marandino, B. Taylor, E. Torrecilla, A. Kock e H. W. Bange. "Sulphur compounds, methane, and phytoplankton: interactions along a north-south transit in the western Pacific Ocean". Biogeosciences Discussions 9, n. 10 (29 ottobre 2012): 15011–49. http://dx.doi.org/10.5194/bgd-9-15011-2012.
Testo completoAbstract (sommario):
Abstract. Here we present results of the first comprehensive study of sulphur compounds and methane in the oligotrophic tropical West Pacific Ocean. The concentrations of dimethylsuphide (DMS), dimethylsulphoniopropionate (DMSP), dimethylsulphoxide (DMSO), and methane (CH4), as well as various phytoplankton marker pigments in the surface ocean were measured along a north-south transit from Japan to Australia in October 2009. DMS (0.9 nmol l−1), dissolved DMSP (DMSPd, 1.6 nmol l−1) and particulate DMSP (DMSPp, 2 nmol l−1) concentrations were generally low, while dissolved DMSO (DMSOd, 4.4 nmol l−1) and particulate DMSO (DMSOp, 11.5 nmol l−1) concentrations were comparably enhanced. Positive correlations were found between DMSO and DMSP as well as DMSP and DMSO with chlorophyll a, which suggests a similar source for both compounds. Similar phytoplankton groups were identified as being important for the DMSO and DMSP pool, thus, the same algae taxa might produce both DMSP and DMSO. In contrast, phytoplankton seemed to play only a minor role for the DMS distribution in the western Pacific Ocean. The observed DMSPp : DMSOp ratios were very low and seem to be characteristic of oligotrophic tropical waters representing the extreme endpoint of the global DMSPp : DMSOp ratio vs. SST relationship. It is most likely that nutrient limitation and oxidative stress in the tropical West Pacific Ocean triggered enhanced DMSO production leading to an accumulation of DMSO in the sea surface. Positive correlations between DMSPd and CH4, as well as between DMSO (particulate and total) and CH4, were found along the transit. We conclude that both DMSP and DMSO serve as substrates for methanogenic bacteria in the western Pacific Ocean.
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Cronshaw, Ian, e R. Quentin Grafton. "A tale of two states: Development and regulation of coal bed methane extraction in Queensland and New South Wales, Australia". Resources Policy 50 (dicembre 2016): 253–63. http://dx.doi.org/10.1016/j.resourpol.2016.10.007.
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Zindler, C., A. Bracher, C. A. Marandino, B. Taylor, E. Torrecilla, A. Kock e H. W. Bange. "Sulphur compounds, methane, and phytoplankton: interactions along a north–south transit in the western Pacific Ocean". Biogeosciences 10, n. 5 (16 maggio 2013): 3297–311. http://dx.doi.org/10.5194/bg-10-3297-2013.
Testo completoAbstract (sommario):
Abstract. Here we present results of the first comprehensive study of sulphur compounds and methane in the oligotrophic tropical western Pacific Ocean. The concentrations of dimethylsuphide (DMS), dimethylsulphoniopropionate (DMSP), dimethylsulphoxide (DMSO), and methane (CH4), as well as various phytoplankton marker pigments in the surface ocean were measured along a north–south transit from Japan to Australia in October 2009. DMS (0.9 nmol L−1), dissolved DMSP (DMSPd, 1.6 nmol L−1) and particulate DMSP (DMSPp, 2 nmol L−1) concentrations were generally low, while dissolved DMSO (DMSOd, 4.4 nmol L−1) and particulate DMSO (DMSOp, 11.5 nmol L−1) concentrations were comparably enhanced. Positive correlations were found between DMSO and DMSP as well as DMSP and DMSO with chlorophyll a, which suggests a similar source for both compounds. Similar phytoplankton groups were identified as being important for the DMSO and DMSP pool, thus, the same algae taxa might produce both DMSP and DMSO. In contrast, phytoplankton seemed to play only a minor role for the DMS distribution in the western Pacific Ocean. The observed DMSPp : DMSOp ratios were very low and seem to be characteristic of oligotrophic tropical waters representing the extreme endpoint of the global DMSPp : DMSOp ratio vs SST relationship. It is most likely that nutrient limitation and oxidative stress in the tropical western Pacific Ocean triggered enhanced DMSO production leading to an accumulation of DMSO in the sea surface. Positive correlations between DMSPd and CH4, as well as between DMSO (particulate and total) and CH4, were found along the transit. We conclude that DMSP and DMSO and/or their degradation products might serve as potential substrates for CH4 production in the oxic surface layer of the western Pacific Ocean.
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Fry, M. M., M. D. Schwarzkopf, Z. Adelman e J. J. West. "Air quality and radiative forcing impacts of anthropogenic volatile organic compound emissions from ten world regions". Atmospheric Chemistry and Physics Discussions 13, n. 8 (13 agosto 2013): 21125–57. http://dx.doi.org/10.5194/acpd-13-21125-2013.
Testo completoAbstract (sommario):
Abstract. Non-methane volatile organic compounds (NMVOCs) influence air quality and global climate change through their effects on secondary air pollutants and climate forcers. Here we simulate the air quality and radiative forcing (RF) impacts of changes in ozone, methane, and sulfate from halving anthropogenic NMVOC emissions globally and from 10 regions individually, using a global chemical transport model and a standalone radiative transfer model. Halving global NMVOC emissions decreases global annual average tropospheric methane and ozone by 36.6 ppbv and 3.3 Tg, respectively, and surface ozone by 0.67 ppbv. All regional reductions slow the production of PAN, resulting in regional to intercontinental PAN decreases and regional NOx increases. These NOx increases drive tropospheric ozone increases nearby or downwind of source regions in the Southern Hemisphere (South America, Southeast Asia, Africa, and Australia). Some regions' NMVOC emissions contribute importantly to air pollution in other regions, such as East Asia, Middle East, and Europe, whose impact on US surface ozone is 43%, 34%, and 34% of North America's impact. Global and regional NMVOC reductions produce widespread negative net RFs (cooling) across both hemispheres from tropospheric ozone and methane decreases, and regional warming and cooling from changes in tropospheric ozone and sulfate (via several oxidation pathways). The total global net RF for NMVOCs is estimated as 0.0277 W m−2 (~1.8% of CO2 RF since the preindustrial). The 100 yr and 20 yr global warming potentials (GWP100, GWP20) are 2.36 and 5.83 for the global reduction, and 0.079 to 6.05 and −1.13 to 18.9 among the 10 regions. The NMVOC RF and GWP estimates are generally lower than previously modeled estimates, due to differences among models in ozone, methane, and sulfate sensitivities, and the climate forcings included in each estimate. Accounting for a~fuller set of RF contributions may change the relative magnitude of each region's impacts. The large variability in the RF and GWP of NMVOCs among regions suggest that regionally-specific metrics may be necessary to include NMVOCs in multi-gas climate trading schemes.
23
Paton-Walsh, Clare, Élise-Andrée Guérette, Dagmar Kubistin, Ruhi Humphries, Stephen R. Wilson, Doreena Dominick, Ian Galbally et al. "The MUMBA campaign: measurements of urban, marine and biogenic air". Earth System Science Data 9, n. 1 (6 giugno 2017): 349–62. http://dx.doi.org/10.5194/essd-9-349-2017.
Testo completoAbstract (sommario):
Abstract. The Measurements of Urban, Marine and Biogenic Air (MUMBA) campaign took place in Wollongong, New South Wales (a small coastal city approximately 80 km south of Sydney, Australia) from 21 December 2012 to 15 February 2013. Like many Australian cities, Wollongong is surrounded by dense eucalyptus forest, so the urban airshed is heavily influenced by biogenic emissions. Instruments were deployed during MUMBA to measure the gaseous and aerosol composition of the atmosphere with the aim of providing a detailed characterisation of the complex environment of the ocean–forest–urban interface that could be used to test the skill of atmospheric models. The gases measured included ozone, oxides of nitrogen, carbon monoxide, carbon dioxide, methane and many of the most abundant volatile organic compounds. The aerosol characterisation included total particle counts above 3 nm, total cloud condensation nuclei counts, mass concentration, number concentration size distribution, aerosol chemical analyses and elemental analysis.The campaign captured varied meteorological conditions, including two extreme heat events, providing a potentially valuable test for models of future air quality in a warmer climate. There was also an episode when the site sampled clean marine air for many hours, providing a useful additional measure of the background concentrations of these trace gases within this poorly sampled region of the globe. In this paper we describe the campaign, the meteorology and the resulting observations of atmospheric composition in general terms in order to equip the reader with a sufficient understanding of the Wollongong regional influences to use the MUMBA datasets as a case study for testing a chemical transport model. The data are available from PANGAEA (http://doi.pangaea.de/10.1594/PANGAEA.871982).
24
Fry, M. M., M. D. Schwarzkopf, Z. Adelman e J. J. West. "Air quality and radiative forcing impacts of anthropogenic volatile organic compound emissions from ten world regions". Atmospheric Chemistry and Physics 14, n. 2 (16 gennaio 2014): 523–35. http://dx.doi.org/10.5194/acp-14-523-2014.
Testo completoAbstract (sommario):
Abstract. Non-methane volatile organic compounds (NMVOCs) influence air quality and global climate change through their effects on secondary air pollutants and climate forcers. Here we simulate the air quality and radiative forcing (RF) impacts of changes in ozone, methane, and sulfate from halving anthropogenic NMVOC emissions globally and from 10 regions individually, using a global chemical transport model and a standalone radiative transfer model. Halving global NMVOC emissions decreases global annual average tropospheric methane and ozone by 36.6 ppbv and 3.3 Tg, respectively, and surface ozone by 0.67 ppbv. All regional reductions slow the production of peroxyacetyl nitrate (PAN), resulting in regional to intercontinental PAN decreases and regional NOx increases. These NOx increases drive tropospheric ozone increases nearby or downwind of source regions in the Southern Hemisphere (South America, Southeast Asia, Africa, and Australia). Some regions' NMVOC emissions contribute importantly to air pollution in other regions, such as East Asia, the Middle East, and Europe, whose impact on US surface ozone is 43%, 34%, and 34% of North America's impact. Global and regional NMVOC reductions produce widespread negative net RFs (cooling) across both hemispheres from tropospheric ozone and methane decreases, and regional warming and cooling from changes in tropospheric ozone and sulfate (via several oxidation pathways). The 100 yr and 20 yr global warming potentials (GWP100, GWP20) are 2.36 and 5.83 for the global reduction, and 0.079 to 6.05 and −1.13 to 18.9 among the 10 regions. The NMVOC RF and GWP estimates are generally lower than previously modeled estimates, due to the greater NMVOC/NOx emissions ratios simulated, which result in less sensitivity to NMVOC emissions changes and smaller global O3 burden responses, in addition to differences in the representation of NMVOCs and oxidation chemistry among models. Accounting for a fuller set of RF contributions may change the relative magnitude of each region's impacts. The large variability in the RF and GWP of NMVOCs among regions suggest that regionally specific metrics may be necessary to include NMVOCs in multi-gas climate trading schemes.
25
Blevin, J. E. "EXPLORATION HIGHLIGHTS FOR 2006". APPEA Journal 47, n. 2 (2007): 631. http://dx.doi.org/10.1071/aj06056.
Testo completoAbstract (sommario):
Key business indicators show an upward trend in exploration activity in Australia during 2006. The year was marked by fluctuating high oil prices, a strong uptake of acreage in most basins, and increased levels of drilling activity and seismic acquisition. Market demand for product, production infrastructure and the fruition of several development projects have pushed the level of exploration activity in both offshore and onshore basins. Despite this trend and the spread of tenements, almost all petroleum discoveries made during 2006 were located within 15 km of existing (but often undeveloped) fields.The Carnarvon Basin continued to be the focus of most offshore exploration activity during 2006, with the highest levels of 3D seismic acquisition and exploration/appraisal/development drilling in the country. Discoveries in the Carnarvon Basin also covered the broadest range of water depths—extending from the oil and gas discoveries made by Apache on the inboard margin of the Barrow Subbasin, to the deepwater gas discoveries at Clio–1 and Chandon–1 by Chevron. Several large gas discoveries were made in the Carnarvon and Bonaparte basins and provide significant tie-back opportunities to existing and planned infrastructure. The Bonaparte Basin also saw significantly increased levels of 2D and 3D seismic acquisition during 2006. Onshore, the Cooper/Eromanga basins continued to experience the highest level of drilling activity and seismic acquisition, while maintaining an overall high drilling success rate. For the first time in many years, data acquisition also occurred in frontier basins like the Daly (Northern Territory), Darling (New South Wales), Tasmanian (Tasmania) and Faust/Capel basins (Lord Howe Rise region).Coal seam methane (CSM) exploration maintained a strong performance in 2006, particularly in Queensland, while South Australia, Queensland and Victoria continue to lead the way with large tracts of acreage gazetted for geothermal energy exploration.
26
McGahan, E. J., F. A. Phillips, S. G. Wiedemann, T. A. Naylor, B. Warren, C. M. Murphy, D. W. T. Griffith e M. Desservettaz. "Methane, nitrous oxide and ammonia emissions from an Australian piggery with short and long hydraulic retention-time effluent storage". Animal Production Science 56, n. 9 (2016): 1376. http://dx.doi.org/10.1071/an15649.
Testo completoAbstract (sommario):
In the Australian pork industry, manure is the main source of greenhouse gases (GHG). In conventional production systems, effluent from sheds is transferred into open anaerobic ponds where the effluent is typically stored for many months, with the potential of generating large quantities of GHG. The present study measured methane (CH4), nitrous oxide (N2O) and ammonia (NH3) emissions from a conventional anaerobic effluent pond (control), a short hydraulic retention-time tank (short HRT, mitigation) and from the animal housing for a flushing piggery in south-eastern Queensland, over two 30-day trials during summer and winter. Emissions were compared to determine the potential for a short HRT to reduce emissions. Average CH4 emissions from the pond were 452 ± 37 g per animal unit (AU; 1 AU = 500 kg liveweight) per day, during the winter trial and 789 ± 29 g/AU.day during the summer trial. Average NH3 emissions were 73 ± 8 g/AU.day during the winter trial and 313 ± 18 g/AU.day during the summer trial. High emission factors during summer will be temperature driven and influenced by the residual volatile solids and nitrogen (N) deposited in the pond during winter. Average NH3 emissions from the piggery shed were 0.707 ± 0.050 g/AU.day and CH4 emissions were 0.344 ± 0.116 g/AU.day. The N2O concentrations from both the pond and shed were close to, or below, the detection limits. Total emissions from the short HRT during the winter and summer trials, respectively, were as follows: CH4 10.65 ± 0.616 mg/AU.day and 4108 ± 473 mg/AU.day; NH3-N 1.15 ± 0.07 mg/AU.day and 29.8 ± 2.57 mg/AU.day; N2O-N 0.001 ± 0.00052 mg/AU.day and 5.9 ± 0.321 mg/AU.day. On the basis of a conservative analysis of CH4 emissions relative to the inflow of volatile solids, and NH3 and N2O emissions as a fraction of the excreted N, GHG emissions were found to be 79% lower from the short-HRT system. This system provides a potential mitigation option to reduce GHG emissions from conventional pork production in Australia.
27
Zhao, Y., Y. Z. Wang, Z. H. Xu e L. Fu. "Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia". Biogeosciences 12, n. 21 (3 novembre 2015): 6279–90. http://dx.doi.org/10.5194/bg-12-6279-2015.
Testo completoAbstract (sommario):
Abstract. Prescribed burning is a forest management practice that is widely used in Australia to reduce the risk of damaging wildfires. Prescribed burning can affect both carbon (C) and nitrogen (N) cycling in the forest and thereby influence the soil-atmosphere exchange of major greenhouse gases, i.e. carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). To quantify the impact of a prescribed burning (conducted on 27 May 2014) on greenhouse gas exchange and the potential controlling mechanisms, we carried out a series of field measurements before (August 2013) and after (August 2014 and November 2014) the fire. Gas exchange rates were determined in four replicate plots which were burned during the combustion and in another four adjacent unburned plots located in green islands, using a set of static chambers. Surface soil properties including temperature, pH, moisture, soil C and N pools were also determined either by in situ measurement or by analysing surface 10 cm soil samples. All of the chamber measurements indicated a net sink of atmospheric CH4, with mean CH4 uptake ranging from 1.15 to 1.99 mg m−2 d−1. Prescribed burning significantly enhanced CH4 uptake as indicated by the significant higher CH4 uptake rates in the burned plots measured in August 2014. In the following 3 months, the CH4 uptake rate was recovered to the pre-burning level. Mean CO2 emission from the forest soils ranged from 2721.76 to 7113.49 mg m−2 d−1. The effect of prescribed burning on CO2 emission was limited within the first 3 months, as no significant difference was observed between the burned and the adjacent unburned plots in both August and November 2014. The CO2 emissions showed more seasonal variations, rather than the effects of prescribed burning. The N2O emission in the plots was quite low, and no significant impact of prescribed burning was observed. The changes in understory plants and litter layers, surface soil temperature, C and N substrate availability and microbial activities, following the prescribed burning, were the factors that controlled the greenhouse gas exchanges. Our results suggested that the low-intensity prescribed burning would decrease soil CO2 emission and increase CH4 uptake, but this effect would be present within a relatively short period. Only slight changes in the surface soil properties during the combustion and very limited impacts of prescribed burning on the mineral soils supported the rapid recovery of the greenhouse gas exchange rates.
28
Zhao, Y., Y. Z. Wang, Z. H. Xu e L. Fu. "Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia". Biogeosciences Discussions 12, n. 13 (9 luglio 2015): 10679–706. http://dx.doi.org/10.5194/bgd-12-10679-2015.
Testo completoAbstract (sommario):
Abstract. Prescribed burning is a forest management practice that is widely used in Australia to reduce the risk of damaging wildfires. It can affect both carbon (C) and nitrogen (N) cycling in the forest and thereby influence the soil–atmosphere exchange of major greenhouse gases, i.e. carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). To quantify the impact of a prescribed burning (conducted on 27 May 2014) on greenhouse gas exchange and the potential controlling mechanisms, we carried out a series of field measurements before (August 2013) and after (August 2014 and November 2014) the fire. Gas exchange rates were determined at 4 replicate sites which were burned during the combustion and another 4 adjacent unburned sites located in green islands, using a set of static chambers. Surface soil properties including temperature, pH, moisture, soil C and N pools were also determined either by in situ measurement or by analysing surface 10 cm soil samples. All of the chamber measurements indicated a net sink of atmospheric CH4, with mean CH4 uptake ranging from 1.15 to 1.99 mg m−2 day−1. The burning significantly enhanced CH4 uptake as indicated by the significant higher CH4 uptake rates at the burned sites measured in August 2014. While within the next 3 months the CH4 uptake rate was recovered to pre-burning levels. Mean CO2 emission from forest soils ranged from 2721.76 to 7113.49 mg m−2 day−1. The effect of prescribed burning on CO2 emission was limited within the first 3 months, as no significant difference was observed between the burned and the adjacent unburned sites in both August and November 2014. The temporal dynamics of the CO2 emission presented more seasonal variations, rather than burning effects. The N2O emission at the studied sites was quite low, and no significant impact of burning was observed. The changes in understory plants and litter layers, surface soil temperature, C and N substrate availability and microbial activities, resulting from the burning, were the factors that controlled the greenhouse gas exchanges. Our results suggested that the low intensity prescribed burning would decrease soil CO2 emission and increase CH4 uptake, however, this effect would be present within a relative short period. Only slight changes in the surface soil during the combustion and very limited damages in the mineral soils supported the quick recovery of the greenhouse gas exchange rates.
29
Russo, V. M., J. L. Jacobs, M. C. Hannah, P. J. Moate, F. R. Dunshea e B. J. Leury. "In vitro evaluation of the methane mitigation potential of a range of grape marc products". Animal Production Science 57, n. 7 (2017): 1437. http://dx.doi.org/10.1071/an16495.
Testo completoAbstract (sommario):
Grape marc consists of the skins, seeds and stems remaining after grapes have been pressed to make wine. Interest in grape marc for use as a dietary feed additive for ruminants has grown after recent research showed that inclusion of grape marc in the diet of dairy cows reduced their enteric methane (CH4) emissions. In the present research, in vitro fermentations were conducted on 20 diverse grape marcs to evaluate their potential as ruminant feed supplements and, in particular, mitigants of enteric CH4 emissions. The grape marcs, which were sourced from vineyards in south-eastern Australia, contained a range of red and white grape varieties with different proportions of skins, seeds and stalks, and had diverse chemical compositions. For each grape marc, four replicate samples, each of 1 g DM, were incubated in vitro with ruminal fluid. The volumes of total gas and CH4 produced after 48 h of incubation were determined. Total gas production ranged from 21.8 to 146.9 mL and CH4 production from 6.8 to 30.3 mL. White grape marcs produced more (P < 0.05) total gas (81.8 mL) than did red grape marcs (61.0 mL), but had a lower (P < 0.05) percentage of CH4 (25.3% and 30.3% of total gas). Grape marcs with a higher proportion of seeds produced less (P < 0.05) total gas than did the types composed of either skin or stalks; however, the seed types produced the greatest (P < 0.05) percentage of CH4 (49.8% of total gas). It is concluded that grape marcs differ greatly in their potential as mitigants of enteric CH4 emissions for ruminal production systems.
30
Dunlop, Mark, Zoran D. Ristovski, Erin Gallagher, Gavin Parcsi, Robin L. Modini, Victoria Agranovski e Richard M. Stuetz. "Odour, dust and non-methane volatile organic-compound emissions from tunnel-ventilated layer-chicken sheds: a case study of two farms". Animal Production Science 53, n. 12 (2013): 1309. http://dx.doi.org/10.1071/an12343.
Testo completoAbstract (sommario):
An observational study was undertaken to measure odour and dust (PM10 and PM2.5) emission rates and identify non-methane volatile organic compounds (NMVOCs) and odorants in the exhaust air from two tunnel-ventilated layer-chicken sheds that were configured with multi-tiered cages and manure belts. The study sites were located in south-eastern Queensland and the West Gippsland region of Victoria, Australia. Samples were collected in summer and winter on sequential days across the manure-belt cleaning cycle. Odour emissions ranged from 58 to 512 ou/s per 1000 birds (0.03–0.27 ou/s.kg) and dust emission rates ranged 0.014–0.184 mg/s per 1000 birds for PM10 and 0.001–0.190 mg/s per 1000 birds for PM2.5. Twenty NMVOCs were identified, including three that were also identified as odorants using thermal desorption–gas chromatography–mass spectrometry/olfactometry analysis. Odour emission rates were observed to vary with the amount of manure accumulation on the manure belts, being lowest 2–4 days after removing manure. Odour emission rates were also observed to vary with diurnal and seasonal changes in ventilation rate. Dust emissions were observed to increase with ventilation rate but not with manure accumulation. Some NMVOCs were identified at both farms and in different seasons whereas others were observed only at one farm or in one season, indicating that odorant composition was influenced by farm-specific practices and season.
31
Gonzalez, Dennis, Sreekanth Janardhanan, Daniel E. Pagendam e Daniel W. Gladish. "Probabilistic Groundwater Flow, Particle Tracking and Uncertainty Analysis for Environmental Receptor Vulnerability Assessment of a Coal Seam Gas Project". Water 12, n. 11 (13 novembre 2020): 3177. http://dx.doi.org/10.3390/w12113177.
Testo completoAbstract (sommario):
The production of coalbed methane, or coal seam gas (CSG) in Australia increased 250-fold since the 1990s to around 1502 petajoules in 2019 and continues to expand. Groundwater flow in the aquifers intersected by gas wells could potentially facilitate a transport pathway for migration of contaminants or poorer quality water from deeper formations. While regulatory and mitigation mechanisms are put in place to minimize the risks, quantitative environmental impact assessments are also undertaken. When many gas wells are drilled in a wide area where many potential receptors are also spatially distributed, potential source-receptor combinations are too numerous to undertake detailed contamination risk assessment using contaminant transport modelling. However, valuable information can be gleaned from the analysis of groundwater flow directions and velocities to inform and prioritise contamination risk assessment and can precede computationally challenging stochastic contaminant transport modelling. A probabilistic particle tracking approach was developed as a computationally efficient screening analysis of contamination pathways for a planned CSG development near Narrabri in northern New South Wales, Australia. Particle tracking was run iteratively with a numerical groundwater flow model across a range of plausible parameter sets to generate an ensemble of estimated flow paths through the main Great Artesian Basin aquifer in the area. Spatial patterns of path lines and spatial relationships with potential receptors including neighbouring groundwater extraction wells and hydrologically connected ecological systems were analysed. Particle velocities ranged from 0.5 to 11 m/year and trajectories indicated dedicated contaminant transport modeling would be ideally focused at the local scale where wells are near potential receptors. The results of this type of analysis can inform the design of monitoring strategies and direct new data collection to reduce uncertainty and improve the effectiveness of adaptive management strategies and early detection of impacts.
32
Henry, Beverley K., D. Butler e S. G. Wiedemann. "A life cycle assessment approach to quantifying greenhouse gas emissions from land-use change for beef production in eastern Australia". Rangeland Journal 37, n. 3 (2015): 273. http://dx.doi.org/10.1071/rj14112.
Testo completoAbstract (sommario):
In life cycle assessment studies, greenhouse gas (GHG) emissions from direct land-use change have been estimated to make a significant contribution to the global warming potential of agricultural products. However, these estimates have a high uncertainty due to the complexity of data requirements and difficulty in attribution of land-use change. This paper presents estimates of GHG emissions from direct land-use change from native woodland to grazing land for two beef production regions in eastern Australia, which were the subject of a multi-impact life cycle assessment study for premium beef production. Spatially- and temporally consistent datasets were derived for areas of forest cover and biomass carbon stocks using published remotely sensed tree-cover data and regionally applicable allometric equations consistent with Australia’s national GHG inventory report. Standard life cycle assessment methodology was used to estimate GHG emissions and removals from direct land-use change attributed to beef production. For the northern-central New South Wales region of Australia estimates ranged from a net emission of 0.03 t CO2-e ha–1 year–1 to net removal of 0.12 t CO2-e ha–1 year–1 using low and high scenarios, respectively, for sequestration in regrowing forests. For the same period (1990–2010), the study region in southern-central Queensland was estimated to have net emissions from land-use change in the range of 0.45–0.25 t CO2-e ha–1 year–1. The difference between regions reflects continuation of higher rates of deforestation in Queensland until strict regulation in 2006 whereas native vegetation protection laws were introduced earlier in New South Wales. On the basis of liveweight produced at the farm-gate, emissions from direct land-use change for 1990–2010 were comparable in magnitude to those from other on-farm sources, which were dominated by enteric methane. However, calculation of land-use change impacts for the Queensland region for a period starting 2006, gave a range from net emissions of 0.11 t CO2-e ha–1 year–1 to net removals of 0.07 t CO2-e ha–1 year–1. This study demonstrated a method for deriving spatially- and temporally consistent datasets to improve estimates for direct land-use change impacts in life cycle assessment. It identified areas of uncertainty, including rates of sequestration in woody regrowth and impacts of land-use change on soil carbon stocks in grazed woodlands, but also showed the potential for direct land-use change to represent a net sink for GHG.
33
Fest, Benedikt J., Nina Hinko-Najera, Tim Wardlaw, David W. T. Griffith, Stephen J. Livesley e Stefan K. Arndt. "Soil methane oxidation in both dry and wet temperate eucalypt forests shows a near-identical relationship with soil air-filled porosity". Biogeosciences 14, n. 2 (27 gennaio 2017): 467–79. http://dx.doi.org/10.5194/bg-14-467-2017.
Testo completoAbstract (sommario):
Abstract. Well-drained, aerated soils are important sinks for atmospheric methane (CH4) via the process of CH4 oxidation by methane-oxidising bacteria (MOB). This terrestrial CH4 sink may contribute towards climate change mitigation, but the impact of changing soil moisture and temperature regimes on CH4 uptake is not well understood in all ecosystems. Soils in temperate forest ecosystems are the greatest terrestrial CH4 sink globally. Under predicted climate change scenarios, temperate eucalypt forests in south-eastern Australia are predicted to experience rapid and extreme changes in rainfall patterns, temperatures and wild fires. To investigate the influence of environmental drivers on seasonal and inter-annual variation of soil–atmosphere CH4 exchange, we measured soil–atmosphere CH4 exchange at high-temporal resolution (< 2 h) in a dry temperate eucalypt forest in Victoria (Wombat State Forest, precipitation 870 mm yr−1) and in a wet temperature eucalypt forest in Tasmania (Warra Long-Term Ecological Research site, 1700 mm yr−1). Both forest soil systems were continuous CH4 sinks of −1.79 kg CH4 ha−1 yr−1 in Victoria and −3.83 kg CH4 ha−1 yr−1 in Tasmania. Soil CH4 uptake showed substantial temporal variation and was strongly controlled by soil moisture at both forest sites. Soil CH4 uptake increased when soil moisture decreased and this relationship explained up to 90 % of the temporal variability. Furthermore, the relationship between soil moisture and soil CH4 flux was near-identical at both forest sites when soil moisture was expressed as soil air-filled porosity (AFP). Soil temperature only had a minor influence on soil CH4 uptake. Soil nitrogen concentrations were generally low and fluctuations in nitrogen availability did not influence soil CH4 uptake at either forest site. Our data suggest that soil MOB activity in the two forests was similar and that differences in soil CH4 exchange between the two forests were related to differences in soil moisture and thereby soil gas diffusivity. The differences between forest sites and the variation in soil CH4 exchange over time could be explained by soil AFP as an indicator of soil moisture status.
34
Caplehorn, John R. M., e Robert G. Batey. "Methadone Maintenance in Australia". Journal of Drug Issues 22, n. 3 (luglio 1992): 661–78. http://dx.doi.org/10.1177/002204269202200314.
Testo completoAbstract (sommario):
The history of methadone treatment in Australia has been and continues to be marked by conflict between two competing aims: harm minimisation and abstinence. The two approaches tend to be associated with high dose-long term and low dose-short term treatment, respectively. Most programmes fail to provide adequate ancillary services, often to the detriment of patient outcome. Despite chronic under-funding, a relative lack of staff training and, in some states, the absence of a system of clinical accountability, Australian methadone services have grown significantly in the last decade. Factors influencing the growth of programmes have been described using the New South Wales programme as the example as it represents the largest and most complex programme in the country. Current problems and the impact of the Human Immunodeficiency Virus on policy development are highlighted.
35
Hill, Michael, e Michael Armstrong. "COAL SEAM METHANE: THE FUTURE OF OPERATIONS IN NEW SOUTH WALES". APPEA Journal 31, n. 1 (1991): 367. http://dx.doi.org/10.1071/aj90029.
Testo completoAbstract (sommario):
The coal seams of the coal basins in New South Wales contain vast resources of methane. The gas has been of interest in the past, principally because the inflow of significant quantities into coal mine workings is a danger to mine safety and reduces production. Drainage techniques have been introduced into deeper collieries but they have not proved to be totally effective.Surface pre-drainage operations using hydraulic fracturing to stimulate gas production have been successful in the United States over recent years. The technique has yet to be successfully tested in New South Wales but if effective it will enable future mining areas to be drained prior to commencement of mining. The technique will also enable commercial production of large quantities of methane from both within and outside the coal mining areas.Seven organisations have commenced or will soon commence the exploration and development of the State's coal seam methane resources. Total planned expenditure over the next two years is over $4 000 000. Other Australian and overseas organisations are actively reviewing investment opportunities.Detailed exploration programs will be required prior to the commencement of operations because of the relative lack of data on the geology and gas resources of the basins. Differences exist between Australian and American coals and comparative reservoir and pilot studies will be required to determine the most effective pre-drainage methods. Potential markets exist in the State for methane and changes have been made to relevant legislation and administrative procedures to create incentives for exploration and production. Careful land-use planning will be required to ensure that the gas resource is not sterilised.
36
Yin, Y., F. Chevallier, P. Ciais, G. Broquet, A. Fortems-Cheiney, I. Pison e M. Saunois. "Decadal trends in global CO emissions as seen by MOPITT". Atmospheric Chemistry and Physics 15, n. 23 (7 dicembre 2015): 13433–51. http://dx.doi.org/10.5194/acp-15-13433-2015.
Testo completoAbstract (sommario):
Abstract. Negative trends of carbon monoxide (CO) concentrations are observed in the recent decade by both surface measurements and satellite retrievals over many regions of the globe, but they are not well explained by current emission inventories. Here, we analyse the observed CO concentration decline with an atmospheric inversion that simultaneously optimizes the two main CO sources (surface emissions and atmospheric hydrocarbon oxidations) and the main CO sink (atmospheric hydroxyl radical OH oxidation). Satellite CO column retrievals from Measurements of Pollution in the Troposphere (MOPITT), version 6, and surface observations of methane and methyl chloroform mole fractions are assimilated jointly for the period covering 2002–2011. Compared to the model simulation prescribed with prior emission inventories, trends in the optimized CO concentrations show better agreement with that of independent surface in situ measurements. At the global scale, the atmospheric inversion primarily interprets the CO concentration decline as a decrease in the CO emissions (−2.3 % yr−1), more than twice the negative trend estimated by the prior emission inventories (−1.0 % yr−1). The spatial distribution of the inferred decrease in CO emissions indicates contributions from western Europe (−4.0 % yr−1), the United States (−4.6 % yr−1) and East Asia (−1.2 % yr−1), where anthropogenic fuel combustion generally dominates the overall CO emissions, and also from Australia (−5.3 % yr−1), the Indo-China Peninsula (−5.6 % yr−1), Indonesia (−6.7 % y−1), and South America (−3 % yr−1), where CO emissions are mostly due to biomass burning. In contradiction with the bottom-up inventories that report an increase of 2 % yr−1 over China during the study period, a significant emission decrease of 1.1 % yr−1 is inferred by the inversion. A large decrease in CO emission factors due to technology improvements would outweigh the increase in carbon fuel combustions and may explain this decrease. Independent satellite formaldehyde (CH2O) column retrievals confirm the absence of large-scale trends in the atmospheric source of CO. However, it should be noted that the CH2O retrievals are not assimilated and OH concentrations are optimized at a very large scale in this study.
37
Yin, Y., F. Chevallier, P. Ciais, G. Broquet, A. Fortems-Cheiney, I. Pison e M. Saunois. "Decadal trends in global CO emissions as seen by MOPITT". Atmospheric Chemistry and Physics Discussions 15, n. 10 (22 maggio 2015): 14505–47. http://dx.doi.org/10.5194/acpd-15-14505-2015.
Testo completoAbstract (sommario):
Abstract. Negative trends of carbon monoxide (CO) concentrations are observed in the recent decade by both surface measurements and satellite retrievals over many regions, but they are not well explained by current emission inventories. Here, we attribute the observed CO concentration decline with an atmospheric inversion that simultaneously optimizes the two main CO sources (surface emissions and atmospheric hydrocarbon oxidations) and the main CO sink (atmospheric hydroxyl radical OH oxidation) by assimilating observations of CO and other chemically related tracers. Satellite CO column retrievals from Measurements of Pollution in the Troposphere (MOPITT), version 6, and surface in-situ measurements of methane and methyl-chloroform mole fractions are assimilated jointly for the period of 2002–2011. Compared to the prior simulation, the optimized CO concentrations show better agreement with independent surface in-situ measurements in terms of both distributions and trends. At the global scale, the atmospheric inversion primarily interprets the CO concentration decline as a decrease in the CO emissions, and finds noticeable trends neither in the chemical oxidation sources of CO, nor in the OH concentrations that regulate CO sinks. The latitudinal comparison of the model state with independent formaldehyde (CH2O) columns retrieved from the Ozone Measurement Instrument (OMI) confirms the absence of large-scale trends in the atmospheric source of CO. The global CO emission decreased by 17% during the decade, more than twice the negative trend estimated by emission inventories. The spatial distribution of the inferred decrease of CO emissions indicates contributions from both a decrease in fossil- and bio-fuel emissions over Europe, the USA and Asia, and from a decrease in biomass burning emissions in South America, Indonesia, Australia and Boreal regions. An emission decrease of 2% yr−1 is inferred in China, one of the main emitting regions, in contradiction with the bottom-up inventories that report an increase of 2% yr−1 during the study period. A large decrease in CO emission factors due to technology improvements would outweigh the increase of carbon fuel combustions and may explain the observed decrease. In Africa, instead of the negative trend (1% yr−1) reported by CO emission inventories mainly contributed by biomass burning, a positive trend (1.5% yr−1) is found by the atmospheric inversion, suggesting different trends between satellite-detected burned areas and CO emissions.
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Gazali, Mohamad, Eri Safutra e Zulfadhli Zulfadhli. "POTENSI MAKROALGA PADINA AUSTRALIS (HAUCK 1887) DI BARAT SELATAN ACEH SEBAGAI AGEN INHIBITOR TIROSINASE". JURNAL PERIKANAN TROPIS 5, n. 1 (1 aprile 2018): 71. http://dx.doi.org/10.35308/jpt.v5i1.1027.
Testo completoAbstract (sommario):
Seaweeds are marine macro algae that can be found attach to the bottom shallow coastal waters. There are three major groups of seaweeds namely brown algae (Phaeophyta), red (Rhodophyta) and green (Chlorophyta). Padina australis is one of brown algae which mostly found in the West-South of Aceh coastal Area. Seaweed contains bioactive compound which can serve as a defense from ultraviolet radiation that caused hyperpigmentation effect The purpose of this study is to analyse the tyrosinase inhibitory activity of P. australis extract from West-South Aceh. The results shown that the methanol extract of P. australis possess phytochemical properties such as flavonoids, tannin and saponin. tyrosinase inhibitory activity of P. australis methanol extract is the best extract which can be inhibit monophenolase with IC50 : 293.520 µg/ml and IC50 = 13.571.067 µg/ml in diphenolase pathway with kojic acid as positive control. Moreover, chloroform and n-hexane extract have no activity of tyrosinase inhibitor. Therefore, new finding of tyrosinase inhibitor agent from marine macroalgae P. australis give the fruitfull information for cosmeceutical industry. P. australis parts could be complementary each other in providing the raw material of cosmetic product.
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Williamson, Paul A., Kevin J. Foreman, Jason M. White e Geoff Anderson. "Methadone‐related overdose deaths in South Australia, 1984‐1994: How safe is methadone prescribing?" Medical Journal of Australia 166, n. 6 (marzo 1997): 302–5. http://dx.doi.org/10.5694/j.1326-5377.1997.tb122318.x.
Testo completo
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SUNJIC, SANDRA, e DEBORAH ZADOR. "Methadone syrup-related deaths in New South Wales, Australia, 1990-95". Drug and Alcohol Review 18, n. 4 (dicembre 1999): 409–15. http://dx.doi.org/10.1080/09595239996275.
Testo completo
41
Zador, Deborah, e Sandra Sunjic. "Deaths in methadone maintenance treatment in New South Wales, Australia 1990-1995". Addiction 95, n. 1 (gennaio 2000): 77–84. http://dx.doi.org/10.1046/j.1360-0443.2000.951778.x.
Testo completo
42
Cockrum, PA, e JA Edgar. "Rapid estimation of corynetoxins in bacterial galls from annual ryegrass (Lolium rigidum Gaudin) by high-performance liquid chromatography". Australian Journal of Agricultural Research 36, n. 1 (1985): 35. http://dx.doi.org/10.1071/ar9850035.
Testo completoAbstract (sommario):
A rapid and sensitive method is described for the extraction, detection and measurement of corynetoxins in ryegrass seed galls colonized by Corynebucterium rathayi. Excised galls are extracted with aqueous methanol and the extract analysed, without further purification, by reversed-phase high-performance liquid chromatography with detection by uItraviolet absorption. The method is applicable down to the level of a single gall or part of a gall with a minimum level of detection of about 0.25 �g using the equipment described. The corynetoxin content of the individual galls examined varied from below the detection limit to 10.6 �g. The highest level of corynetoxin in a single gall was 1.15% of gall weight. The corynetoxin composition of galls collected during outbreaks of annual ryegrass toxicity in South Australia, Western Australia and South Africa during a 19-year period were found to be similar.
43
Gaughwin, Matt, Patty Solomon e Robert Ali. "Correlates of retention on the South Australian Methadone Program 1981-91". Australian and New Zealand Journal of Public Health 22, n. 7 (dicembre 1998): 771–76. http://dx.doi.org/10.1111/j.1467-842x.1998.tb01491.x.
Testo completo
44
Gaughwin, Matthew D., e Robert Ali. "HIV infection among injecting drug users in the South Australian methadone program". Medical Journal of Australia 162, n. 5 (marzo 1995): 242–44. http://dx.doi.org/10.5694/j.1326-5377.1995.tb139876.x.
Testo completo
45
Caplehorn, John R. M. "Official and de facto admission criteria for methadone maintenance in New South Wales, Australia". Drug and Alcohol Review 17, n. 1 (marzo 1998): 121–22. http://dx.doi.org/10.1080/09595239800187671.
Testo completo
46
Le, Phuong-Phi, e Elizabeth D. Hotham. "South Australian rural community pharmacists and the provision of methadone, buprenorphine and injecting equipment". International Journal of Pharmacy Practice 16, n. 3 (giugno 2008): 149–54. http://dx.doi.org/10.1211/ijpp.16.3.0004.
Testo completo
47
Loh, Zoë, Deli Chen, Mei Bai, Travis Naylor, David Griffith, Julian Hill, Tom Denmead, Sean McGinn e Robert Edis. "Measurement of greenhouse gas emissions from Australian feedlot beef production using open-path spectroscopy and atmospheric dispersion modelling". Australian Journal of Experimental Agriculture 48, n. 2 (2008): 244. http://dx.doi.org/10.1071/ea07244.
Testo completoAbstract (sommario):
Feedlot production of beef cattle results in concentrated sources of gas emissions to the atmosphere. Reported here are the preliminary results of a micrometeorological study using open-path concentration measurements to determine whole-of-feedlot emissions of methane (CH4) and ammonia (NH3). Tunable near-infrared diode lasers were used to measure line-averaged (150–400 m) open-path concentrations of CH4 and NH3. A backward Lagrangian stochastic model of atmospheric dispersion and the software package WindTrax were used to estimate greenhouse gas fluxes from the measured concentrations. We studied typical Australian beef feedlots in the north (Queensland) and south (Victoria) of the continent. The data from a campaign during summer show a range of CH4 emissions from 146 g/animal.day in Victoria to 166 g/animal.day in Queensland and NH3 emissions from 125 g/animal.day in Victoria to 253 g/animal.day Queensland.
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ZADOR, D., P. M. LYONS WALL e I. WEBSTER. "High sugar intake in a group of women on methadone maintenance in South Western Sydney, Australia". Addiction 91, n. 7 (luglio 1996): 1053–61. http://dx.doi.org/10.1046/j.1360-0443.1996.917105311.x.
Testo completo
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ZADOR, D., P. M. LYONS WALL e I. WEBSTER. "High sugar intake in a group of women on methadone maintenance in South Western Sydney, Australia". Addiction 91, n. 7 (luglio 1996): 1053–61. http://dx.doi.org/10.1111/j.1360-0443.1996.tb03601.x.
Testo completo
50
McGee, P. A. "Reduced growth and deterrence from feeding of the insect pest Helicoverpa armigera associated with fungal endophytes from cotton". Australian Journal of Experimental Agriculture 42, n. 7 (2002): 995. http://dx.doi.org/10.1071/ea01124.
Testo completoAbstract (sommario):
More than 13 morphospecies of fungal endophyte were isolated from leaves of cotton collected from eastern New South Wales, Australia. Of the fungi tested, methanol extracts of 4 morphospecies offered with a food source reduced the larval growth rate of the insect pest Helicoverpa armigera. Extracts of different isolates of 1�common morphospecies had varying effects on growth rates of H. armigera and H. punctigera. The impact of the endophytes after inoculation to leaves of cotton also differed. Five of 10 selected isolates were associated with reduced feeding from leaf discs in a feeding-choice experiment with H. armigera. The data are consistent with the view that some fungal endophytes benefit their host through reduced herbivory of the plant.