Journal articles on the topic 'Dust storms Australia'

Dust storms are frequent in Australia and can have a large impact on the soil resource, the economy and people. There have been few economic studies of the impact of wind erosion worldwide and only one in Australia before this study. While wind erosion impacts on the soil resource at the point of the erosion, the level of economic impact rises as the population and associated infrastructure affected by dust increases. This study estimates the impact on the economy of the state of New South Wales of a single large dust storm called Red Dawn that passed over the eastern coast of Australia on 23 September 2009. Estimates for rural and urban areas are presented with both on- and off-site costs evaluated. The estimated cost is A$299 million (with a range of A$293–A$313 million) with most of the cost being associated with household cleaning and associated activities. The dust storm also impacted on many cities on the coast of the state of Queensland, but their costs are not included in this study. This study demonstrates some, but not all, of the major economic costs associated with wind erosion in Australia. Given the annual average cost of dust storms it is suggested that A$9 million per year would be a conservative estimate of the level of investment required in rural areas for dust mitigation strategies, based on improved land management that could be justified to achieve a positive impact on soil condition and reduce economic losses in rural towns and the more populous coastal cities.

Aeolian dust deposition has been shown to stimulate phytoplankton growth in various oligotrophic oceanic regions of the northern hemisphere. The present study investigated the relationship between the change in phytoplankton biomass in Queensland coastal waters and aeolian dust deposition during the severe October 2002 dust storm, using satellite-derived chlorophyll concentrations. A response in phytoplankton standing stock immediately following dust deposition from this event was found in the area of maximal dust deposition, as defined by a previous dust transport modelling analysis. Standing stock levels increased to 1.5–2 times the long-term mean. This is the first documented episode of a dust fertilisation event in Australian coastal waters and, given the high frequency of dust storms in northern Australia, demonstrates that aeolian delivery of nutrients may be an important factor in future regional nutrient budget analyses.

During the austral spring of 2009 several significant dust storms occurred in south-east Australia including the so-called ‘Red Dawn’ event in late September. Estimates of 2.5 Mt total suspended particulate sediment lost off the Australian coast in the 3000km long dust plume make it the largest off-continent loss of soil ever reported. Much of this material was transported over the coastline of New South Wales and into the adjacent Tasman Sea. Long-term model simulations of dust deposition over the south-west Tasman Sea suggest the amount deposited during the spring of 2009 was approximately three times the long-term monthly average. Previous satellite-based analyses of the biological response of Tasman Sea waters to dust-derived nutrients are equivocal or have observed no response. Satellite-derived surface chlorophyll concentrations in the southern Tasman during the spring of 2009 are well above the climatological mean, with positive anomalies as high as 0.5mgm–3. Dust transport simulations indicate strong deposition to the ocean surface, which during both the ‘Red Dawn’ event and mid-October 2009 dust storm events was enhanced by heavy precipitation. Cloud processing of the dust aerosol may have enhanced iron bioavailability for phytoplankton uptake.

Dust storms originating from Central Australia and western New South Wales frequently cause high particle concentrations at many sites across New South Wales, both inland and along the coast. This study focussed on a dust storm event in February 2019 which affected air quality across the state as detected at many ambient monitoring stations in the Department of Planning, Industry and Environment (DPIE) air quality monitoring network. The WRF-Chem (Weather Research and Forecast Model—Chemistry) model is used to study the formation, dispersion and transport of dust across the state of New South Wales (NSW, Australia). Wildfires also happened in northern NSW at the same time of the dust storm in February 2019, and their emissions are taken into account in the WRF-Chem model by using Fire Inventory from NCAR (FINN) as emission input. The model performance is evaluated and is shown to predict fairly accurate the PM2.5 and PM10 concentration as compared to observation. The predicted PM2.5 concentration over New South Wales during 5 days from 11 to 15 February 2019 is then used to estimate the impact of the February 2019 dust storm event on three health endpoints, namely mortality, respiratory and cardiac disease hospitalisation rates. The results show that even though as the daily average of PM2.5 over some parts of the state, especially in western and north western NSW near the centre of the dust storm and wild fires, are very high (over 900 µg/m3), the population exposure is low due to the sparse population. Generally, the health impact is similar in order of magnitude to that caused by biomass burning events from wildfires or from hazardous reduction burnings (HRBs) near populous centres such as in Sydney in May 2016. One notable difference is the higher respiratory disease hospitalisation for this dust event (161) compared to the fire event (24).

Between 11 and 15 February 2019, a dust storm originating in Central Australia with persistent westerly and south westerly winds caused high particle concentrations at many sites in the state of New South Wales (NSW); both inland and along the coast. The dust continued to be transported to New Zealand and to Antarctica in the south east. This study uses observed data and the WRF-Chem Weather Research Forecast model based on GOCART-AFWA (Goddard Chemistry Aerosol Radiation and Transport–Air Force and Weather Agency) dust scheme and GOCART aerosol and gas-phase MOZART (Model for Ozone And Related chemical Tracers) chemistry model to study the long-range transport of aerosols for the period 11 to 15 February 2019 across eastern Australia and onto New Zealand and Antarctica. Wildfires also happened in northern NSW at the same time, and their emissions are taken into account in the WRF-Chem model by using the Fire Inventory from NCAR (FINN) as the emission input. Modelling results using the WRF-Chem model show that for the Canterbury region of the South Island of New Zealand, peak concentration of PM10 (and PM2.5) as measured on 14 February 2019 at 05:00 UTC at the monitoring stations of Geraldine, Ashburton, Timaru and Woolston (Christchurch), and about 2 h later at Rangiora and Kaiapoi, correspond to the prediction of high PM10 due to the intrusion of dust to ground level from the transported dust layer above. The Aerosol Optical Depth (AOD) observation data from MODIS 3 km Terra/Aqua and CALIOP LiDAR measurements on board CALIPSO (Cloud-Aerosol LiDAR and Infrared Pathfinder Satellite Observations) satellite also indicate that high-altitude dust ranging from 2 km to 6 km, originating from this dust storm event in Australia, was located above Antarctica. This study suggests that the present dust storms in Australia can transport dust from sources in Central Australia to the Tasman sea, New Zealand and Antarctica.

The lands held by Aboriginal people are mostly located in the Australian desert, aside from pastoral country purchased under the Indigenous Land Corporation, they are among the least amenable to agricultural production. Social expectations regarding land use are undergoing a multifunctional transition with a move away from a focus on production, to increased amenity and conservation uses. This change means that Aboriginal people with cultural connections to country enjoy an absolute advantage in managing country through their application of land care involving Indigenous ecological knowledge. An integrated multidisciplinary economic welfare approach, based on data from northern Australia and the central Australian desert, is used to demonstrate the role Aboriginal people can play in caring for country. Such engagement can be to the advantage of Aboriginal people through a multiplicity of private and public good benefits, such as improving Aboriginal health, maintaining biodiversity, and the mitigation of climate change impacts through possible greenhouse gas biosequestration and the reduction of dust storms – which are an important vector of disease.

Background: Desert dust outbreaks and dust storms are the major source of particulate matter globally and pose a major threat to human health. We investigated the microorganisms transported with desert dust particles and evaluated their potential impact on human health. Methods: A systematic review of all reports on the association between non-anthropogenic desert dust pollution, dust microorganisms and human health is conducted. Results: In total, 51 articles were included in this review. The affected regions studied were Asia (32/51, 62.7%) followed by Europe (9/51, 17.6%), America (6/51, 11.8%), Africa (4/51, 7.8%) and Australia (1/51, 2.0%). The Sahara Desert was the most frequent source of dust, followed by Asian and American deserts. In 39/51 studies the dust-related microbiome was analyzed, while, in 12/51 reports, the association of desert dust with infectious disease outbreaks was examined. Pathogenic and opportunistic agents were isolated from dust in 24/39 (61.5%) and 29/39 (74.4%) of the studies, respectively. A significant association of dust events with infectious disease outbreaks was found in 10/12 (83.3%) reports. The infectious diseases that were mostly investigated with dust outbreaks were pneumonia, respiratory tract infections, COVID-19, pulmonary tuberculosis and coccidioidomycosis. Conclusions: Desert dust outbreaks are vehicles of a significant number of pathogenic or opportunistic microorganisms and limited data indicate an association between dust events and infectious disease outbreaks. Further research is required to strengthen the correlation between dust events and infectious diseases and subsequently guide preventive public health measures.

This paper presents a summary of the key findings of the special issue of Atmosphere on Air Quality in New South Wales and discusses the implications of the work for policy makers and individuals. This special edition presents new air quality research in Australia undertaken by (or in association with) the Clean Air and Urban Landscapes hub, which is funded by the National Environmental Science Program on behalf of the Australian Government’s Department of the Environment and Energy. Air pollution in Australian cities is generally low, with typical concentrations of key pollutants at much lower levels than experienced in comparable cities in many other parts of the world. Australian cities do experience occasional exceedances in ozone and PM2.5 (above air pollution guidelines), as well as extreme pollution events, often as a result of bushfires, dust storms, or heatwaves. Even in the absence of extreme events, natural emissions play a significant role in influencing the Australian urban environment, due to the remoteness from large regional anthropogenic emission sources. By studying air quality in Australia, we can gain a greater understanding of the underlying atmospheric chemistry and health risks in less polluted atmospheric environments, and the health benefits of continued reduction in air pollution. These conditions may be representative of future air quality scenarios for parts of the Northern Hemisphere, as legislation and cleaner technologies reduce anthropogenic air pollution in European, American, and Asian cities. However, in many instances, current legislation regarding emissions in Australia is significantly more lax than in other developed countries, making Australia vulnerable to worsening air pollution in association with future population growth. The need to avoid complacency is highlighted by recent epidemiological research, reporting associations between air pollution and adverse health outcomes even at air pollutant concentrations that are lower than Australia’s national air quality standards. Improving air quality is expected to improve health outcomes at any pollution level, with specific benefits projected for reductions in long-term exposure to average PM2.5 concentrations.

Abstract. At present, major dust storms are occurring at mid-latitudes in the Middle East and Asia, as well as at low latitudes in northern Africa and in Australia. Western Europe, though, does not experience such dramatic climate events, except for some African dust reaching it from the Sahara. This modern situation is of particular interest, in the context of future climate projections, since the present interglacial is usually interpreted, in this context, as an analog of the warm Eemian interval. European terrestrial records show, however, major dust events during the penultimate interglacial and early glacial. These events are easily observed in loess records by their whitish-color deposits, which lie above and below dark chernozem paleosols in Central European records of Marine Isotope Stage (MIS) 5 age. We describe here the base of the Dolni Vestonice (DV) loess sequence, Czech Republic, as the reference of such records. The dust is deposited during intervals that are characterized by poor vegetation – manifested by high δ13C values and low magnetic susceptibility – while the fine sand and clay in the deposits shows grain sizes that are clearly different from the overlying pleniglacial loess deposits. Some of these dust events have been previously described as "Markers" or Marker Silts (MS) by one of us (G. Kukla), and are dated at about 111–109 and 93–92 ka, with a third and last one slightly visible at about 75–73 ka. Other events correspond to the loess material of Kukla's cycles, and are described as eolian silts (ES); they are observed in the same DV sequence and are dated at about 106–105, 88–86, and 78.5–77 ka. The fine eolian deposits mentioned above, MS as well as ES, correspond to short events that lasted about 2 ka; they are synchronous with re-advances of the polar front over the North Atlantic, as observed in marine sediment cores. These deposits also correlate with important changes observed in European vegetation. Some ES and MS events appear to be coeval with significant dust peaks recorded in the Greenland ice cores, while others are not. This decoupling between the European eolian and Greenland dust depositions is of considerable interest, as it differs from the fully glacial situation, in which the Eurasian loess sedimentation mimics the Greenland dust record. Previous field observations supported an interpretation of MS events as caused by continental dust storms. We show here, by a comparison with speleothems of the same age found in the northern Alps, that different atmospheric-circulation modes seem to be responsible for the two categories of dust events, MS vs. ES.

Abstract. At present, major dust storms are occurring at mid-latitudes in the Middle East and Asia, as well as at low latitudes in Northern Africa and in Australia. Western Europe, though, does not experience such dramatic climate events, except for some African dust reaching it from the Sahara. This modern situation is of particular interest, in the context of future climate projections, since the present interglacial is usually interpreted, in this context, as an analog of the warm Eemian interval. European terrestrial records show, however, major dust events during the penultimate interglacial and early glacial. These events are easily observed in loess records by their whitish-color deposits, which lie above and below dark chernozem paleosols in Central European records of Marine Isotope Stage (MIS) 5 age. We describe here the base of the Dolni Vestonice (DV) loess sequence, Czech Republic, as the reference of such records. The dust is deposited during intervals that are characterized by poor vegetation – manifested by high δ13C values and low magnetic susceptibility – while the fine sand and clay in the deposits shows grain sizes that are clearly different from the overlying pleniglacial loess deposits. Some of these dust events have been previously described as "Markers" or Marker Silts (MS) by one of us (G. Kukla), and are dated at about 111–109 ka and 93–92 ka, with a third and last one slightly visible at about 75–73 ka. Other events correspond to the loess material of Kukla's cycles, and are described as eolian silts (ES); they are observed in the same DV sequence and are dated at about 106–105 ka, 88–86 ka, and 78.5–77 ka. These dates are determined by considering the OSL ages with their errors measured on the studied sequence, and the comparison with Greenland ice-core and European speleothem chronologies. The fine eolian deposits mentioned above, MS as well as ES, correspond to short events that lasted about 2 ka; they are synchronous with re-advances of the polar front over the North Atlantic, as observed in marine sediment cores. These deposits also correlate with important changes observed in European vegetation. Some ES and MS events appear to be coeval with significant dust peaks recorded in the Greenland ice cores, while others are not. This decoupling between the European eolian and Greenland dust depositions is of considerable interest, as it differs from the fully glacial situation, in which the Eurasian loess sedimentation mimics the Greenland dust record. Previous field observations supported an interpretation of MS events as caused by continental dust storms. We show here, by a comparison with speleothems of the same age found in the northern Alps, that different atmospheric-circulation modes seem to be responsible for the two categories of dust events, MS vs. ES.

ABSTRACTA massive central Australian dust storm in September 2009 was associated with abundant fungal spores (150,000/m3) and hyphae in coastal waters between Brisbane (27°S) and Sydney (34°S). These spores were successfully germinated from formalin-preserved samples, and using molecular sequencing of three different genes (the large subunit rRNA gene [LSU], internal transcribed spacer [ITS[, and beta-tubulin gene), they were conclusively identified asAspergillus sydowii, an organism circumstantially associated with gorgonian coral fan disease in the Caribbean. Surprisingly, no human health or marine ecosystem impacts were associated with this Australian dust storm event. Australian fungal cultures were nontoxic to fish gills and caused a minor reduction in the motility ofAlexandriumorChattonellaalgal cultures but had their greatest impacts onSymbiodiniumdinoflagellate coral symbiont motility, with hyphae being more detrimental than spores. While we have not yet seen any soft coral disease outbreaks on the Australian Great Barrier Reef similar to those observed in the Caribbean and while this particular fungal population was non- or weakly pathogenic, our observations raise the possibility of future marine ecosystem pathogen impacts from similar dust storms harboring more pathogenic strains.

Environmental context. Dust particles produced from wind blown soils are of global significance as these dust particles not only impact visibility, as evident in the recent 2009 Australian dust storm, but also atmospheric chemistry, climate and biogeochemical cycles. The amount of water vapour in the atmosphere (relative humidity) can play a role in these global processes yet there are few studies and little quantitative data on water-dust particle interactions. The focus of this research is on quantifying water-dust particle interactions for several dust sources including Asia and Africa where dust storms are most prevalent. Abstract. Mineral dust aerosol provides a reactive surface in the troposphere. The reactivity of mineral dust depends on the source region as chemical composition and mineralogy of the aerosol affects its interaction with atmospheric gases. Furthermore, the impact of mineral dust aerosol in atmospheric processes and climate is a function of relative humidity. In this study, we have investigated water uptake of complex dust samples. In particular, water uptake as a function of relative humidity has been measured on three different dust sources that have been characterised using a variety of bulk and surface techniques. For these well-characterised dust samples, it is shown that although there are variations in chemical composition and mineralogy, on a per mass basis, water uptake capacities for the three dusts are very similar and are comparable to single component clay samples. These results suggest that the measured uptake of water of these bulk samples is dominated by the clay component.

Abstract The large dust event of 23 September 2009 is recognized as the most significant on record in Australia since the 1940s. At its peak, reported hourly average particulate concentrations exceeded 15,000 μg m−3, significantly exceeding the Australian National Air Quality Standard of 50 μg m−3 and daily September averages of 20–25 μg m−3. Measurements of the spectral surface ultraviolet irradiance monitored continuously before, after, and during the event of 23 September 2009 are presented. These measurements highlight the significance of extreme dust load on the ultraviolet irradiance, and exceed previously published UV attenuations measured in Saharan and Chinese dust events. Measured spectral attenuations of up to 99.5% in the ultraviolet B and 97.6% in the ultraviolet A were associated with the arrival of low-altitude cumuliform cloud and the dust plume ahead of an approaching cold front on the morning of 23 September 2009. The data presented cover the period of maximum attenuation and the afternoon, which had no cloud cover. This research characterizes for the first time the influence of a frontal desert dust storm on the surface ultraviolet irradiance in the naturally high ambient ultraviolet climate of subtropical Australia.

Environmental context In 2009, at the end of the longest drought period ever recorded in Australia, a major dust storm blanketed the cities of Sydney and Brisbane for more than 24 h. The source of the dust was inner New South Wales and South Australia, where large scale open-cut mining occurs together with agricultural practices. We report results of extensive mineralogical and chemical analyses of the dust, and discuss their significance in terms of the dust origins and potential human health risks. Abstract In a 24-h period from 23 to 24 September 2009, a dust storm passed over Sydney, Australia that produced a red sky and reduced the visibility to a few metres. It was Sydney’s worst dust storm since 1942. During this period, the PM10 (particles measuring 10 μm or less) value jumped from 50 to 11 800 µg m–3. The dust storm was sampled and its mineralogical and organic contents were analysed. Four major particle sizes (0.6, 4.5, 9.3 and 20 µm) were observed in the dust. A multimodal particle distribution indicated a long range of dust transport. Mineralogical analysis showed that the particles were mainly composed of crustal elemental oxides of Al and Si. The ratio of Al/Si was 0.39 and the organic content was 10.6 %, which was found to be enriched with humic-type substances. The high Al/Si ratio (>0.3) indicated that the dust originated from desert land whereas the high organic content indicated that the particles were also derived from eroded agricultural land. A fluorescence spectroscopic study on the organic matter at excitation and emission wavelengths of 245–265 and 330–350 nm indicated that biohazardous substances were unlikely to be present in the dust.

The central premise of the paper by Shaw et al. (2008) (hereafter SGM) is that phytoplankton in coastal waters of Queensland, Australia, were nutrient-limited and that biomass increased immediately following a large dust storm in October 2002. I will show that (i) the timing of the phytoplankton response precludes the dust storm as a causative agent for chlorophyll increases and (ii) it is not clear that there was actually any change in chlorophyll in response to the dust storm.

Atmospheric dust and rainfall were collected at 19 locations within a 90 x 10 km study area extending eastwards from the coast near Adelaide, South Australia. Monthly collections for up to 3 years established seasonal and regional trends in fallout of particulate matter. Fallout was highest in the area of highest rainfall, but correlation of monthly rainfall with fallout was generally not statistically significant. The amount of dust collected was higher under tree foliage than in adjacent open space. Annual accession of atmospheric dust within this urban-rural transect was in the range of 5-10 t km-2 but the occasional severe dust storm could contribute about half the annual rate. These accretions of dust to the landscape, 2.5-5 mm per 1000 years, were about one hundredth of the recommended soil loss tolerance adopted in many studies of soil erosion, and thus unlikely to contribute significantly to models developed for soil loss on that basis. Dust accessions were, however, similar to estimates of rates of soil formation or profile deepening on resistant rocks of 1-5 mm per 1000 years which may be appropriate to conditions in southern Australia. Incorporation of such accessions into existing soils would be difficult to identify yet may provide a significant factor in pedogenesis in the higher rainfall areas. The low rates of soil development in many Australian landscapes, with contribution from both weathering and eolian dust inputs, would encourage the adoption of soil loss tolerances in soil erosion management that are orders of magnitude lower than those commonly accepted.

Land degradation surveys in Australia may not have fully delineated the nature and extent of wind erosion, owing perhaps, to a shortage of quantitative data on wind erosion rates and to the subtle and transient nature of field evidence. The Ew Index of wind erosion demonstrates that regional climatic factors (i.e. effective soil moisture and wind erosivity) have a significant influence upon wind erosion rates (measured by dust storm frequencies). Also, a map of wind erosion classes shows areas where wind erosion is increased or decreased by local conditions of soil/sediment erodibility and/or agricultural and pastoral activities.

Environmental contextMineral dust aerosol is both an efficient scatterer of solar radiation, potentially cooling the planet, and a moderate absorber, potentially warming it: the exact balance is both uncertain, and geographically variable. Australian desert soils are noticeably more reddish than most Northern Hemisphere deserts, most probably a result of enhanced iron mineralogy. This paper contains results from a field campaign designed to increase our understanding of the chemistry of Australian mineral dust aerosol, especially in relation to iron and salt. AbstractAustralia is the dominant source of mineral dust aerosol in the Southern Hemisphere, yet the physical, chemical and optical properties of this aerosol remain poorly understood. Four sets of size-resolved aerosol samples were collected at a site on the edge of the Lake Eyre Basin (LEB), in the south-east dust transport pathway. Back trajectory analysis shows that three samples were sourced from the LEB (one during a rare winter dust storm), and one from coastal regions to the south. All samples were subjected to both ion beam analysis and ion chromatography. A Fe/Al ratio of 0.9 was found, consistent with results from our other campaigns to sites in the LEB, significantly higher than typical Northern Hemisphere values (~0.45–0.6). This confirms the iron-rich character of central Australian soils. Clear evidence of marine advection in the fourth sample was also found, and evidence of chloride depletion by nitric acid in two samples.

AbstractDirect normal irradiance (DNI) is the main input for concentrating solar power (CSP) technologies—an important component in future energy scenarios. DNI forecast accuracy is sensitive to radiative transfer schemes (RTSs) and microphysics in numerical weather prediction (NWP) models. Additionally, NWP models have large regional aerosol uncertainties. Dust aerosols can significantly attenuate DNI in extreme cases, with marked consequences for applications such as CSP. To date, studies have not compared the skill of different physical parameterization schemes for predicting hourly DNI under varying aerosol conditions over Australia. The authors address this gap by aiming to provide the first Weather and Forecasting (WRF) Model DNI benchmarks for Australia as baselines for assessing future aerosol-assimilated models. Annual and day-ahead simulations against ground measurements at selected sites focusing on an extreme dust event are run. Model biases are assessed for five shortwave RTSs at 30- and 10-km grid resolutions, along with the Thompson aerosol-aware scheme in three different microphysics configurations: no aerosols, fixed optical properties, and monthly climatologies. From the annual simulation, the best schemes were the Rapid Radiative Transfer Model for global climate models (RRTMG), followed by the new Goddard and Dudhia schemes, despite the relative simplicity of the latter. These top three RTSs all had 1.4–70.8 W m−2 lower mean absolute error than persistence. RRTMG with monthly aerosol climatologies was the best combination. The extreme dust event had large DNI mean bias overpredictions (up to 4.6 times), compared to background aerosol results. Dust storm–aware DNI forecasts could benefit from RRTMG with high-resolution aerosol inputs.

ABSTRACT Major solar eruptions occasionally cause magnetic superstorms on the Earth. Despite their serious consequences, the low frequency of their occurrence provides us with only limited cases through modern instrumental observations, and the intensities of historical storms before the coverage of the Dst index have been only sporadically estimated. Herein, we examine a solar-terrestrial storm that occurred in 1946 March and quantitatively evaluate its parameters. During the ascending phase of Solar Cycle 18, two moderate sunspot groups caused a major flare. The H α flaring area was recorded to be ≥600–1200 millionths of solar hemisphere, suggesting that this was an M- or X-class flare in soft X-ray intensity. Upon this eruption, a rapid interplanetary coronal mass ejection (ICME) with an average speed of ≈1590 km s−1 was launched. Based on measurements in four known mid-latitude and relatively complete magnetograms, the arrival of this extreme ICME caused a magnetic superstorm, which caused an initial phase with the H-component amplitude of ≥80 nT, followed by a main phase whose intensity was reconstructed as ≤−512 nT using most negative Dst* estimates. Meanwhile, the equatorial boundary of the auroral oval extended down to ≤41${^{\circ}_{.}}$8 in invariant latitude and formed a corona aurora in Watheroo, Australia. Interestingly, during this magnetic superstorm, larger magnetic disturbances were recorded at dusk and near the dip equator on the dayside. Its cause may be associated with a strong westward equatorial electrojet and field-aligned current, in addition to the contribution from the storm-time ring current.

Air quality related to respiratory illness is examined in many settings, including populations that work or reside close to sources of pollution. Industry produced pollution from mining and metal manufacturing, natural environmental pollution as in the case of bushfires and large-scale dust storms are examples. We reviewed any available literature and data concerning the Queensland coal industry and its effect on respiratory health of miners, mining related workers and communities in proximity to coal mines. We searched various databases using keywords related to coal and respiratory diseases, using the five step criteria defined by Denyer and Tranfield. In the Queensland coal mining industry, the negative effect of mining on workers’ respiratory health has been known for many years and has received increased attention in the last five years both nationally and internationally due to the resurgence in Coal Mine Dust Lung Diseases and specifically Coal Worker’s Pneumoconiosis (CWP). A Queensland parliamentary review has prompted regulatory amendments for the permitted (occupational) exposure level (PEL; OEL) to coal dust and silica; amendments have also been enacted for better occupational respiratory health surveillance of Queensland coal miners, both surface and underground. Considering Queensland has a high proportion of Australian coal mines, the literature available on respiratory health in Queensland coal mines and surrounding communities is minimal. There is very limited research into, and possible underreporting of CMDLD amongst the coal mining workers in Queensland. Further studies are required to better understand air pollution and health effects in coal miners in Queensland.

Abstract. The ionospheric response at middle and high latitudes in the Antarctica American and Australian sectors to the 26–27 September 2011 moderately intense geomagnetic storm was investigated using instruments including an ionosonde, riometer, and GNSS receivers. The multi-instrument observations permitted us to characterize the ionospheric storm-enhanced density (SED) and tongues of ionization (TOIs) as a function of storm time and location, considering the effect of prompt penetration electric fields (PPEFs). During the main phase of the geomagnetic storm, dayside SEDs were observed at middle latitudes, and in the nightside only density depletions were observed from middle to high latitudes. Both the increase and decrease in ionospheric density at middle latitudes can be attributed to a combination of processes, including the PPEF effect just after the storm onset, dominated by disturbance dynamo processes during the evolution of the main phase. Two SEDs–TOIs were identified in the Southern Hemisphere, but only the first episode had a counterpart in the Northern Hemisphere. This difference can be explained by the interhemispheric asymmetry caused by the high-latitude coupling between solar wind and the magnetosphere, which drives the dawn-to-dusk component of the interplanetary magnetic field. The formation of polar TOI is a function of the SED plume location that might be near the dayside cusp from which it can enter the polar cap, which was the case in the Southern Hemisphere. Strong GNSS scintillations were observed at stations collocated with SED plumes at middle latitudes and cusp on the dayside and at polar cap TOIs on the nightside.

Abstract Recurrent dust storms represent a significant concern in Australia because of their related hazards and damages since particulate matter (PM) has harmful impacts on the environmental, health and economic sectors. The particulate matter may be released from natural sources and human activities. The major part of natural particulate matter is emitted into the air by wind erosion processes from desert and semi-desert areas at the world scale. A huge dust storm crossed over several areas of New South Wales (NSW), Australia, including the Sydney region on 21–22 November 2018 and decreased the horizontal visibility to less than 1 km for 22 h. This study examined the synoptic weather conditions, and assessed the air quality and identified the source and transport trajectory of the dust storm over Sydney using ground and satellite remote sensing data. PM10 (< 10 μm) concentrations were obtained from selected air quality monitoring sites operated by the Environmental Protection Agency in NSW. The highest hourly concentration of PM10 (578.7 μg/m3) was recorded at Singleton in the Hunter Valley, while concentrations in Sydney ranged from 480 to 385 μg/m3, well above the standard air quality level in Australia (50 μg/m3 per 24 h). The HYSPLIT back trajectories of air parcels suggest that the potential sources of the dust episode originated from the Lake Eyre Basin and northeast South Australia, the Mundi Mundi plains west of Broken Hill, Cobar and the grazing lands and the red sandplains in northwestern NSW. It then travelled towards the east coast. These long-range airflows transported suspended dust particles, raising air quality to hazardous levels (elevated PM10 levels) over most areas of NSW. The results from the HYSPLIT model for dust movement are confirmed by MODIS satellite images. Many areas of NSW experienced this intense dust storm due to northwest wind generated by the low-pressure systems and cold fronts over South Australia and many parts of western NSW as it moved eastward.

While waterways and tempestuous, cyclonic forces have dominated former readings of Carpentaria, this paper places its focus on another elemental presence embedded in the environment of northern Australia: dust. The south highlands region of Alexis Wright’s Waanyi Country is bound by ties which not only flow out into the ocean to the north, but to the desert and dry country to the south. While dust in Western literature, has predominantly signified human limits, death, absence and fear, this paper illuminates how the dust of Carpentaria denotes connection to the past, the time immemorial of Indigenous relation to Country, through which the dynamic forces and regenerative powers of catastrophe can be comprehended. Tracing pathways of dust through the novel and across its landscapes reveals the powerful role this infinitesimal substance occupies in the story’s ecology. From the dust storms which strike the story in primeval fury, to Mozzie Fishman’s dust-covered convoy from which Will Phantom emerges, to the final climatic obliteration of the mine, dust assuages the threat of destruction and fragmentation through its connection to what Wright has described as the ancient library, the deep knowledge and epic storytelling traditions ingrained in Country.

This article examines, in part, the spread of an introduced grass species, Buffel grass (Cenchrus ciliaris), in central Australia. It is also about immersing oneself in an unfamiliar landscape and environment, and exploring the kind of writing that can emerge from that process. It is informed by James Clifford's proposition in 'Fort Ross Meditation' that history occurs on diverse and overlapping temporal registers such as weather, dust, faultlines, human histories, animal histories and histories of seeds, among others. While the article does not explicitly discuss Clifford’s argument, it is an attempt to explore similarly diverse histories including those generated by arid zone scientists, Albert Namatjira’s efforts to gain a grazing licence, environmental impact of settlement (including erosion, dust storms and species extinction), along with personal narratives impelled by engagement with place. The article does not aim to theorise its content, rather to elaborate knowledge of landscape along with that elusive quality, a ‘sense of place’, through connecting disparate things.

Introduction: Extreme weather events such as dust storms are predicted to become more frequent as the global climate warms through the 21st century. Studies of Asian, Saharan, Arabian, and Australian dust storms have found associations with cardiovascular and total non-accidental mortality and hospitalizations for stroke. However, the only population-level epidemiological work on dust storms in the United States was focused on a single small metropolitan area (Spokane, WA), and it is uncertain whether its null results are representative of the country as a whole. Hypothesis: Dust storms in the United States are associated with daily cardiovascular mortality. Methods: Dust storm incidence data (N=141), including date and approximate location, as well as meteorological station observations, were taken from the U.S. National Weather Service. County-level mortality data for the years 1993-2005 were acquired from the National Center for Health Statistics. Ambient particulate matter monitor concentrations were obtained from the U.S. Environmental Protection Agency. Inference was performed used conditional logistic regression models under a case-crossover design while accounting for the nonlinear effect of temperature. Results: We found a 9.5% increase in cardiovascular mortality at a two-day lag (95% CI: [0.31%,19.5%], p = 0.042). The results were robust to adjusting for heat waves and ambient particulate matter concentrations. Analysis of storms occurring only on days with <0.1 inches of precipitation strengthened these results and in addition yielded a mean daily increase of 4.0% across lags 0-5 (95% CI: [0.07%,20.8%], p = 0.046). In Arizona, the U.S. state with the largest number of storms, we observed a 13.0% increase at a three-day lag (CI: [0.40%,27.1%], p = 0.043). Conclusions: Dust storms in the U.S. are associated with increases in lagged cardiovascular mortality. This has implications for the development of public health advisories and suggests that further public health interventions may be needed. Disclaimer: This work does not represent official U.S. Environmental Protection Agency policy.

Introduction One of the ways in which ‘country’ is made to work discursively is in ‘country music’ – defining a genre and sensibility in music production, marketing and consumption. This article seeks to excavate one small niche in the historical geography of country music to explore exactly how discursive antecedents emerged, and crucially, how images associated with ‘country’ surfaced and travelled internationally via one of the new ‘global’ media of the first half of the twentieth century – sheet music. My central arguments are twofold: first, that alongside aural qualities and lyrical content, the visual elements of sheet music were important and thus far have been under-acknowledged. Sheet music diffused the imagery connecting ‘country’ to music, to particular landscapes, and masculinities. In the literature on country music much emphasis has been placed on film, radio and television (Tichi; Peterson). Yet, sheet music was for several decades the most common way people bought personal copies of songs they liked and intended to play at home on piano, guitar or ukulele. This was particularly the case in Australia – geographically distant, and rarely included in international tours by American country music stars. Sheet music is thus a rich text to reveal the historical contours of ‘country’. My second and related argument is that that the possibilities for the globalising of ‘country’ were first explored in music. The idea of transnational discourses associated with ‘country’ and ‘rurality’ is relatively new (Cloke et al; Gorman-Murray et al; McCarthy), but in music we see early evidence of a globalising discourse of ‘country’ well ahead of the time period usually analysed. Accordingly, my focus is on the sheet music of country songs in Australia in the first half of the twentieth century and on how visual representations hybridised travelling themes to create a new vernacular ‘country’ in Australia. Creating ‘Country’ Music Country music, as its name suggests, is perceived as the music of rural areas, “defined in contrast to metropolitan norms” (Smith 301). However, the ‘naturalness’ of associations between country music and rurality belies a history of urban capitalism and the refinement of deliberate methods of marketing music through associated visual imagery. Early groups wore suits and dressed for urban audiences – but then altered appearances later, on the insistence of urban record companies, to emphasise rurality and cowboy heritage. Post-1950, ‘country’ came to replace ‘folk’ music as a marketing label, as the latter was considered to have too many communistic references (Hemphill 5), and the ethnic mixing of earlier folk styles was conveniently forgotten in the marketing of ‘country’ music as distinct from African American ‘race’ and ‘r and b’ music. Now an industry of its own with multinational headquarters in Nashville, country music is a ‘cash cow’ for entertainment corporations, with lower average production costs, considerable profit margins, and marketing advantages that stem from tropes of working class identity and ‘rural’ honesty (see Lewis; Arango). Another of country music’s associations is with American geography – and an imagined heartland in the colonial frontier of the American West. Slippages between ‘country’ and ‘western’ in music, film and dress enhance this. But historical fictions are masked: ‘purists’ argue that western dress and music have nothing to do with ‘country’ (see truewesternmusic.com), while recognition of the Spanish-Mexican, Native American and Hawaiian origins of ‘cowboy’ mythology is meagre (George-Warren and Freedman). Similarly, the highly international diffusion and adaptation of country music as it rose to prominence in the 1940s is frequently downplayed (Connell and Gibson), as are the destructive elements of colonialism and dispossession of indigenous peoples in frontier America (though Johnny Cash’s 1964 album The Ballads Of The American Indian: Bitter Tears was an exception). Adding to the above is the way ‘country’ operates discursively in music as a means to construct particular masculinities. Again, linked to rural imagery and the American frontier, the dominant masculinity is of rugged men wrestling nature, negotiating hardships and the pressures of family life. Country music valorises ‘heroic masculinities’ (Holt and Thompson), with echoes of earlier cowboy identities reverberating into contemporary performance through dress style, lyrical content and marketing imagery. The men of country music mythology live an isolated existence, working hard to earn an income for dependent families. Their music speaks to the triumph of hard work, honest values (meaning in this context a musical style, and lyrical concerns that are ‘down to earth’, ‘straightforward’ and ‘without pretence’) and physical strength, in spite of neglect from national governments and uncaring urban leaders. Country music has often come to be associated with conservative politics, heteronormativity, and whiteness (Gibson and Davidson), echoing the wider politics of ‘country’ – it is no coincidence, for example, that the slogan for the 2008 Republican National Convention in America was ‘country first’. And yet, throughout its history, country music has also enabled more diverse gender performances to emerge – from those emphasising (or bemoaning) domesticity; assertive femininity; creative negotiation of ‘country’ norms by gay men; and ‘alternative’ culture (captured in the marketing tag, ‘alt.country’); to those acknowledging white male victimhood, criminality (‘the outlaw’), vulnerability and cruelty (see Johnson; McCusker and Pecknold; Saucier). Despite dominant tropes of ‘honesty’, country music is far from transparent, standing for certain values and identities, and yet enabling the construction of diverse and contradictory others. Historical analysis is therefore required to trace the emergence of ‘country’ in music, as it travelled beyond America. A Note on Sheet Music as Media Source Sheet music was one of the main modes of distribution of music from the 1930s through to the 1950s – a formative period in which an eclectic group of otherwise distinct ‘hillbilly’ and ‘folk’ styles moved into a single genre identity, and after which vinyl singles and LP records with picture covers dominated. Sheet music was prevalent in everyday life: beyond radio, a hit song was one that was widely purchased as sheet music, while pianos and sheet music collections (stored in a piece of furniture called a ‘music canterbury’) in family homes were commonplace. Sheet music is in many respects preferable to recorded music as a form of evidence for historical analysis of country music. Picture LP covers did not arrive until the late 1950s (by which time rock and roll had surpassed country music). Until then, 78 rpm shellac discs, the main form of pre-recorded music, featured generic brown paper sleeves from the individual record companies, or city retail stores. Also, while radio was clearly central to the consumption of music in this period, it obviously also lacked the pictorial element that sheet music could provide. Sheet music bridged the music and printing industries – the latter already well-equipped with colour printing, graphic design and marketing tools. Sheet music was often literally crammed with information, providing the researcher with musical notation, lyrics, cover art and embedded advertisements – aural and visual texts combined. These multiple dimensions of sheet music proved useful here, for clues to the context of the music/media industries and geography of distribution (for instance, in addresses for publishers and sheet music retail shops). Moreover, most sheet music of the time used rich, sometimes exaggerated, images to convince passing shoppers to buy songs that they had possibly never heard. As sheet music required caricature rather than detail or historical accuracy, it enabled fantasy without distraction. In terms of representations of ‘country’, then, sheet music is perhaps even more evocative than film or television. Hundreds of sheet music items were collected for this research over several years, through deliberate searching (for instance, in library archives and specialist sheet music stores) and with some serendipity (for instance, when buying second hand sheet music in charity shops or garage sales). The collected material is probably not representative of all music available at the time – it is as much a specialised personal collection as a comprehensive survey. However, at least some material from all the major Australian country music performers of the time were found, and the resulting collection appears to be several times larger than that held currently by the National Library of Australia (from which some entries were sourced). All examples here are of songs written by, or cover art designed for Australian country music performers. For brevity’s sake, the following analysis of the sheet music follows a crudely chronological framework. Country Music in Australia Before ‘Country’ Country music did not ‘arrive’ in Australia from America as a fully-finished genre category; nor was Australia at the time without rural mythology or its own folk music traditions. Associations between Australian national identity, rurality and popular culture were entrenched in a period of intense creativity and renewed national pride in the decades prior to and after Federation in 1901. This period saw an outpouring of art, poetry, music and writing in new nationalist idiom, rooted in ‘the bush’ (though drawing heavily on Celtic expressions), and celebrating themes of mateship, rural adversity and ‘battlers’. By the turn of the twentieth century, such myths, invoked through memory and nostalgia, had already been popularised. Australia had a fully-established system of colonies, capital cities and state governments, and was highly urbanised. Yet the poetry, folk music and art, invariably set in rural locales, looked back to the early 1800s, romanticising bush characters and frontier events. The ‘bush ballad’ was a central and recurring motif, one that commentators have argued was distinctly, and essentially ‘Australian’ (Watson; Smith). Sheet music from this early period reflects the nationalistic, bush-orientated popular culture of the time: iconic Australian fauna and flora are prominent, and Australian folk culture is emphasised as ‘native’ (being the first era of cultural expressions from Australian-born residents). Pioneer life and achievements are celebrated. ‘Along the road to Gundagai’, for instance, was about an iconic Australian country town and depicted sheep droving along rustic trails with overhanging eucalypts. Male figures are either absent, or are depicted in situ as lone drovers in the archetypal ‘shepherd’ image, behind their flocks of sheep (Figure 1). Figure 1: No. 1 Magpie Ballads – The Pioneer (c1900) and Along the road to Gundagai (1923). Further colonial ruralities developed in Australia from the 1910s to 1940s, when agrarian values grew in the promotion of Australian agricultural exports. Australia ‘rode on the sheep’s back’ to industrialisation, and governments promoted rural development and inland migration. It was a period in which rural lifestyles were seen as superior to those in the crowded inner city, and government strategies sought to create a landed proletariat through post-war land settlement and farm allotment schemes. National security was said to rely on populating the inland with those of European descent, developing rural industries, and breeding a healthier and yet compliant population (Dufty), from which armies of war-ready men could be recruited in times of conflict. Popular culture served these national interests, and thus during these decades, when ‘hillbilly’ and other North American music forms were imported, they were transformed, adapted and reworked (as in other places such as Canada – see Lehr). There were definite parallels in the frontier narratives of the United States (Whiteoak), and several local adaptations followed: Tex Morton became Australia’s ‘Yodelling boundary rider’ and Gordon Parsons became ‘Australia’s yodelling bushman’. American songs were re-recorded and performed, and new original songs written with Australian lyrics, titles and themes. Visual imagery in sheet music built upon earlier folk/bush frontier themes to re-cast Australian pastoralism in a more settled, modernist and nationalist aesthetic; farms were places for the production of a robust nation. Where male figures were present on sheet music covers in the early twentieth century, they became more prominent in this period, and wore Akubras (Figure 2). The lyrics to John Ashe’s Growin’ the Golden Fleece (1952) exemplify this mix of Australian frontier imagery, new pastoralist/nationalist rhetoric, and the importation of American cowboy masculinity: Go west and take up sheep, man, North Queensland is the shot But if you don’t get rich, man, you’re sure to get dry rot Oh! Growin’ the golden fleece, battlin’ a-way out west Is bound to break your flamin’ heart, or else expand your chest… We westerners are handy, we can’t afford to crack Not while the whole darn’d country is riding on our back Figure 2: Eric Tutin’s Shearers’ Jamboree (1946). As in America, country music struck a chord because it emerged “at a point in history when the project of the creation and settlement of a new society was underway but had been neither completed nor abandoned” (Dyer 33). Governments pressed on with the colonial project of inland expansion in Australia, despite the theft of indigenous country this entailed, and popular culture such as music became a means to normalise and naturalise the process. Again, mutations of American western imagery, and particular iconic male figures were important, as in Roy Darling’s (1945) Overlander Trail (Figure 3): Wagon wheels are rolling on, and the days seem mighty long Clouds of heat-dust in the air, bawling cattle everywhere They’re on the overlander trail Where only sheer determination will prevail Men of Aussie with a job to do, they’ll stick and drive the cattle through And though they sweat they know they surely must Keep on the trail that winds a-head thro’ heat and dust All sons of Aussie and they will not fail. Sheet music depicted silhouetted men in cowboy hats on horses (either riding solo or in small groups), riding into sunsets or before looming mountain ranges. Music – an important part of popular culture in the 1940s – furthered the colonial project of invading, securing and transforming the Australian interior by normalising its agendas and providing it with heroic male characters, stirring tales and catchy tunes. Figure 3: ‘Roy Darling’s (1945) Overlander Trail and Smoky Dawson’s The Overlander’s Song (1946). ‘Country Music’ Becomes a (Globalised) Genre Further growth in Australian country music followed waves of popularity in the United States in the 1940s and 1950s, and was heavily influenced by new cross-media publicity opportunities. Radio shows expanded, and western TV shows such as Bonanza and On the Range fuelled a ‘golden age’. Australian performers such as Slim Dusty and Smokey Dawson rose to fame (see Fitzgerald and Hayward) in an era when rural-urban migration peaked. Sheet music reflected the further diffusion and adoption of American visual imagery: where male figures were present on sheet music covers, they became more prominent than before and wore Stetsons. Some were depicted as chiselled-faced but simple men, with plain clothing and square jaws. Others began to more enthusiastically embrace cowboy looks, with bandana neckerchiefs, rawhide waistcoats, embellished and harnessed tall shaft boots, pipe-edged western shirts with wide collars, smile pockets, snap fasteners and shotgun cuffs, and fringed leather jackets (Figure 4). Landscapes altered further too: cacti replaced eucalypts, and iconic ‘western’ imagery of dusty towns, deserts, mesas and buttes appeared (Figure 5). Any semblance of folk music’s appeal to rustic authenticity was jettisoned in favour of showmanship, as cowboy personas were constructed to maximise cinematic appeal. Figure 4: Al Dexter’s Pistol Packin’ Mama (1943) and Reg Lindsay’s (1954) Country and Western Song Album. Figure 5: Tim McNamara’s Hitching Post (1948) and Smoky Dawson’s Golden West Album (1951). Far from slavish mimicry of American culture, however, hybridisations were common. According to Australian music historian Graeme Smith (300): “Australian place names appear, seeking the same mythological resonance that American localisation evoked: hobos became bagmen […] cowboys become boundary riders.” Thus alongside reproductions of the musical notations of American songs by Lefty Frizzel, Roy Carter and Jimmie Rodgers were songs with localised themes by new Australian stars such as Reg Lindsay and Smoky Dawson: My curlyheaded buckaroo, My home way out back, and On the Murray Valley. On the cover of The square dance by the billabong (Figure 6) – the title of which itself was a conjunction of archetypal ‘country’ images from both America and Australia – a background of eucalypts and windmills frames dancers in classic 1940s western (American) garb. In the case of Tex Morton’s Beautiful Queensland (Figure 7), itself mutated from W. Lee O’Daniel’s Beautiful Texas (c1945), the sheet music instructed those playing the music that the ‘names of other states may be substituted for Queensland’. ‘Country’ music had become an established genre, with normative values, standardised images and themes and yet constituted a stylistic formula with enough polysemy to enable local adaptations and variations. Figure 6: The Square dance by the billabong, Vernon Lisle, 1951. Figure 7: Beautiful Queensland, Tex Morton, c1945 source: http://nla.gov.au/nla.mus-vn1793930. Conclusions In country music images of place and masculinity combine. In music, frontier landscapes are populated by rugged men living ‘on the range’ in neo-colonial attempts to tame the land and convert it to productive uses. This article has considered only one media – sheet music – in only one country (Australia) and in only one time period (1900-1950s). There is much more to say than was possible here about country music, place and gender – particularly recently, since ‘country’ has fragmented into several niches, and marketing of country music via cable television and the internet has ensued (see McCusker and Pecknold). My purpose here has been instead to explore the early origins of ‘country’ mythology in popular culture, through a media source rarely analysed. Images associated with ‘country’ travelled internationally via sheet music, immensely popular in the 1930s and 1940s before the advent of television. The visual elements of sheet music contributed to the popularisation and standardisation of genre expectations and appearances, and yet these too travelled and were adapted and varied in places like Australia which had their own colonial histories and folk music heritages. Evidenced here is how combinations of geographical and gender imagery embraced imported American cowboy imagery and adapted it to local markets and concerns. Australia saw itself as a modern rural utopia with export aspirations and a desire to secure permanence through taming and populating its inland. Sheet music reflected all this. So too, sheet music reveals the historical contours of ‘country’ as a transnational discourse – and the extent to which ‘country’ brought with it a clearly defined set of normative values, a somewhat exaggerated cowboy masculinity, and a remarkable capacity to be moulded to local circumstances. Well before later and more supposedly ‘global’ media such as the internet and television, the humble printed sheet of notated music was steadily shaping ‘country’ imagery, and an emergent international geography of cultural flows. References Arango, Tim. “Cashville USA.” Fortune, Jan 29, 2007. Sept 3, 2008, http://money.cnn.com/magazines/fortune/fortune_archive/2007/01/22/8397980/index.htm. Cloke, Paul, Marsden, Terry and Mooney, Patrick, eds. Handbook of Rural Studies, London: Sage, 2006. 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