Dissertationen zum Thema „Atmospheric carbon dioxide“
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Barkley, Michael P. „Measuring atmospheric carbon dioxide from space“. Thesis, University of Leicester, 2007. http://hdl.handle.net/2381/30591.
Der volle Inhalt der QuelleHaworth, Matthew. „Mesozoic atmospheric carbon dioxide concentrations from fossil plant cutucles“. Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442779.
Der volle Inhalt der QuelleMurphy, Paulette P. „The carbonate system in seawater : laboratory and field studies /“. Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/8509.
Der volle Inhalt der QuelleCheng, Yufu. „Effects of manipulated atmospheric carbon dioxide concentrations on carbon dioxide and water vapor fluxes in Southern California chaparral /“. For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 95-101). Also available via the World Wide Web. (Restricted to UC campuses).
DeLacy, Brendan G. Bandy A. R. „The determination of carbon dioxide flux in the atmosphere using atmospheric pressure ionization mass spectrometry and isotopic dilution /“. Philadelphia, Pa. : Drexel University, 2006. http://dspace.library.drexel.edu/handle/1860%20/868.
Der volle Inhalt der QuelleSindhøj, Erik. „Elevated atmospheric CO₂ in a semi-natural grassland : root dynamics, decomposition and soil C balances /“. Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5797-1.pdf.
Der volle Inhalt der QuelleKessler, Toby Jonathan 1974. „Calculating the global flux of carbon dioxide into groundwater“. Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/54439.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 85-90).
In this research, the global annual flux of inorganic carbon into groundwater was calculated to be 4.4 GtC/y, with a lower bound of 1.4 GtC/y and an upper bound of 27.5 GtC/y. Starting with 44 soil PCO2 measurements, the dissolved inorganic carbon (DIC) of the groundwater was determined by equilibrium equations for the carbonate system. The calculated DIC was then multiplied by the groundwater recharge to determine the annual carbon flux per area. These PCO2 estimates were assigned to specific bio-temperatures and precipitations according to the Holdridge life-zone classification system, and regressions between PCO2, biotemperature, and precipitation were used to provide estimates for regions of the world that lacked PCO2 measurements. The fluxes were mapped on a generalized Holdridge life-zone map, and the total flux for each life-zone was found by multiplying the calculated flux by the area in each life-zone. While there was a wide range in the error, the calculations in this study strongly suggest that the flux of carbon into groundwater is comparable to many of the major fluxes that have been tabulated for the carbon cycle. The large flux that was calculated in this study was due to the high PCO2 that is common in soils. The elevated PCO2 levels are due to the decomposition of organic matter in soils, and the absorption of oxygen by plant roots. After the groundwater enters into rivers, it is possible that large amounts of CO2 is released from the surface of rives, as the carbon-rich waters re-equilibrate with the low atmospheric PCO2-
by Toby Jonathan Kessler.
S.M.
Kambis, Alexis Demitrios. „A numerical model of the global carbon cycle to predict atmospheric carbon dioxide concentrations“. W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539616709.
Der volle Inhalt der QuelleOsterman, My. „Carbon dioxide in agricultural streams : Magnitude and patterns of an understudied atmospheric carbon source“. Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355402.
Der volle Inhalt der QuelleCollins, Sinead. „Microalgal adaptation to changes in carbon dioxide“. Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100340.
Der volle Inhalt der QuelleJones, Dylan Gwynn. „The effects of elevated atmospheric concentrations of carbon dioxide on trees“. Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318146.
Der volle Inhalt der QuelleKaminski, Daniel Thomas. „Corrosion Inhibition of Magnesium Alloys and Influence of Atmospheric Carbon Dioxide“. The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460241073.
Der volle Inhalt der QuelleGlenn, Aaron James, und University of Lethbridge Faculty of Arts and Science. „Growing season carbon dioxide exchange of two contrasting peatland ecosystems“. Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2005, 2005. http://hdl.handle.net/10133/259.
Der volle Inhalt der Quellexii, 126 leaves : ill. (some col.) ; 29 cm.
Ferretti, Dominic Francesco. „The development and application of a new high precision GC-IRMS technique for N₂O-free isotopic analysis of astmospheric CO₂“. [Wellington, New Zealand] : Victoria University of Wellington, 1999. http://catalog.hathitrust.org/api/volumes/oclc/154329143.html.
Der volle Inhalt der QuelleBachman, Sarah. „Elevated atmospheric carbon dioxide and precipitation alter ecosystem carbon fluxes over northern mixed-grass prairie at the prairie heating and CO2 enrichment (PHACE) experiment in Cheyenne, Wyoming, USA“. Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1445355711&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Der volle Inhalt der QuelleMandiwana, KL, und N. Panichev. „The leaching of vanadium(V) in soil due to the presence of atmospheric carbon dioxide and ammonia“. Elsevier, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001493.
Der volle Inhalt der QuelleSey, Benjamin Kweku. „Carbon dioxide and nitrous oxide production from corn and soybean agroecosystems“. Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102726.
Der volle Inhalt der QuelleMcKinley, Galen Anile 1973. „Interannual variability of air-sea fluxes of carbon dioxide and oxygen“. Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16824.
Der volle Inhalt der QuelleThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 161-169).
The currently observed increase in atmospheric CO2 due anthropogenic emissions is substantially slowed by natural processes that incorporate CO2 into the terrestrial biota and the ocean. Year-to-year changes in the CO2 growth rate that exceed variations in the fossil fuel source indicate a significant variability in these global CO2 sinks. However, the enormous complexity of the terrestrial and oceanic biogeochemical systems that absorb atmospheric CO2 makes these sinks extremely difficult to understand and precisely quantify. Many techniques, including the interpretation of the relative changes in atmospheric CO2 and O2/N2, ocean modeling, and atmospheric data inversions, have been employed to estimate the mean and variability of global CO2 sinks. However, uncertainty remains large. The goal of this thesis is to improve understanding of global CO2 sinks by considering (1) the error in the atmospheric O2/N2 partitioning method due to the neglect of interannual variability in the air-sea fluxes of 02, and (2) the interannual variability of the ocean CO2 sink.
(cont.) A global, high-resolution ocean general circulation model is used to estimate the magnitude and understand the mechanisms of interannual variability in air-sea fluxes of both CO2 and 02. I find that the global variability in the fluxes of both gases are dominantly forced by large-scale physical processes governing upper ocean dynamics, particularly El Nifio / Southern Oscillation (ENSO) and, for 02, the North Atlantic Oscillation (NAO). Estimates of the extremes of CO2 and 02 flux variability for the period 1980-1998 are +/-0.5x1015 grams Carbon/yr (PgC/yr) and -70/+100x1012 mol/yr (Tmol/yr), respectively. Global 02 flux variability implies up to a 1.0 PgC/yr error in estimates of interannual variability in land and ocean CO2 sinks derived from atmospheric 02/N2 observations. This error is significant for estimates of annual sinks, but it is cumulatively negligible for estimates of mean sinks from October 1991 to April 1998. Increasing convergence of estimates of land.
by Galen Anile McKinley.
Ph.D.
Jaeger, Alexa. „Methane and carbon dioxide cycling in soils of the Harvard Forest“. Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117912.
Der volle Inhalt der QuelleCataloged from PDF version of thesis.
Includes bibliographical references (page 18).
Soil is Earth's largest terrestrial carbon pool (Oertel et al., 2016) and can act as a net source of greenhouse gases (GHG). However, if organic material accumulates in soils faster than it is converted to CO2 by cellular respiration, soil becomes a smaller GHG source and even has the potential to become a GHG sink. Not much is known about factors that drive soil to be a source or a sink of GHG. Soil temperature and moisture have both been shown to correlate with CH4 emissions and temperature has been shown to correlate with CO 2 emissions (Jacinthe et al., 2015). Currently these relationships are not well constrained, particularly in upland soils, which are soils found at elevations between 100 and 500 m (Carating et al., 2014). Soil from the Harvard Forest was collected and used in two in-lab flux experiments to constrain the effect that soil moisture has on i.) the rate of CH4 and CO2 production/consumption and ii.) the fraction of injected CH4 that is oxidized to CO2 by soil microbes. The first experiment involved injecting vials containing soil samples with CH4 , taking an initial measurement with a residual gas analyzer (RGA), incubating for three days, and taking final measurements using the RGA. The results of this experiment indicated that cellular respiration is an important carbon source in these soils, with more CO2 coming from cellular respiration than from the oxidation of CH4. The second experiment involved injecting vials containing soil samples with CH4 and 14CH4 as a tracer, incubating for six days, and analyzing CO2 from each sample using a scintillation counter. This experiment showed a weak trend indicating that increased soil moisture may result in decreased CH4 oxidation. Results showed that decays per minute from the samples were lower than in a control. These results indicated that not all CO 2 from each sample was successfully captured and analyzed using the methods here. So while the trend may hold true, it should be supported by reconducting the experiment using a more reliable means of CO2 capture. The unexpected results from both experiments indicated that there is still much to be learned about the reactions that occur in these soils and how to perfect laboratory methods to study them.
by Alexa Jaeger.
S.B.
Cotrufo, Maria Francesca. „Effects of enriched atmospheric concentration of carbon dioxide on tree litter decomposition“. Thesis, Lancaster University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282385.
Der volle Inhalt der QuelleStrader, Heidi Suzanne. „Trends in atmospheric carbon dioxide over the last ten to fifteen years“. Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/57752.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 85-87).
by Heidi Suzanne Strader.
M.S.
Wilkins, Diana. „Effect of elevated carbon dioxide on cherry (Prunus) : a biochemical and physiological approach“. Thesis, University of Sussex, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282143.
Der volle Inhalt der QuellePepper, David A. „Investigation of the long term physiological response of Huon pine (Lagarostrobos franklinii) to changes in atmospheric CO2 and climate using stable isotopes“. Phd thesis, School of Biological Sciences, 1999. http://hdl.handle.net/2123/4032.
Der volle Inhalt der QuelleTitle from title screen (viewed February 12, 2009). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Biological Sciences, Faculty of Science. Degree awarded 2000; thesis submitted 1999. The 2 in the title is in subscript. Includes bibliographical references. Also available in print form.
McElwain, Jennifer Claire. „Fossil stomatal parameters as indicators of palaeo-atmospheric CO2 concentration through Phanerozoic time“. Thesis, Royal Holloway, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362713.
Der volle Inhalt der QuelleButterworth, Brian J. „Air-sea carbon dioxide exchange in the Southern Ocean and Antarctic Sea ice zone“. Thesis, State University of New York at Albany, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10149297.
Der volle Inhalt der QuelleThe Southern Ocean is an important part of the global carbon cycle, responsible for roughly half of the carbon dioxide (CO2) absorbed by the global ocean. The air-sea CO2 flux (Fc) can be expressed as the product of the water-air CO2 partial pressure difference (ΔpCO2) and the gas transfer velocity ( k), an exchange coefficient which represents the efficiency of gas exchange. Generally, Fc is negative (a sink) throughout the Southern Ocean and Antarctic sea ice zone (SIZ), but uncertainty in k has made it difficult to develop an accurate regional carbon budget. Constraining the functional dependence of k on wind speed in open water environments, and quantifying the effect of sea ice on k, will reduce uncertainty in the estimated contribution of the Southern Ocean and Antarctic SIZ to the global carbon cycle.
To investigate Fc in the Southern Ocean, a ruggedized, unattended, closed-path eddy covariance (EC) system was deployed on the Antarctic research vessel Nathaniel B. Palmer for nine cruises during 18 months from January 2013 to June 2014 in the Southern Ocean and coastal Antarctica. The methods are described and results are shown for two cruises chosen for their latitudinal range, inclusion of open water and sea ice cover, and large ΔpCO2. The results indicated that ship-based unattended EC measurements in high latitudes are feasible, and recommendations for deployments in such environments were provided.
Measurements of Fc and ΔpCO2 were used to compute k. The open water data showed a quadratic relationship between k (cm hr–1) and the neutral 10-m wind speed (U10n, m s –1), k=0.245 U10n 2+1.3, in close agreement with tracer-based results and much lower than previous EC studies. In the SIZ, it was found that k decreased in proportion to sea ice cover. This contrasted findings of enhanced Fc in the SIZ by previous open-path EC campaigns. Using the NBP results a net annual Southern Ocean (ocean south of 30°S) carbon flux of –1.1 PgC yr–1 was calculated.
Berry, Stephanie C. Carleton University Dissertation Biology. „The influence of vegetation and soil carbon dioxide exchange on the concentration and isotopic composition of atmospheric carbon dioxide within plant canopies“. Ottawa, 1994.
Den vollen Inhalt der Quelle findenLukac, Martin. „Effects of atmospheric COâ†2 enrichment on root processes and mycorrhizal functioning in short rotation intensive poplar plantation“. Thesis, Bangor University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391756.
Der volle Inhalt der QuelleCario, Cara Hinkson. „Elevated atmospheric carbon dioxide and chronic atmospheric nitrogen deposition change nitrogen dynamics associated with two Mediterranean climate evergreen oaks /“. For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Der volle Inhalt der QuelleRochefort, Line. „Atmospheric COâ†2 and environmental determinants of plant growth : a model with Sinapis alba L“. Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240047.
Der volle Inhalt der QuelleHemming, D. L. „Stable isotopes in tree rings : biosensors of climate and atmospheric carbon-dioxide variations“. Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603940.
Der volle Inhalt der QuelleFoote, Alexander. „Converting carbon dioxide into value added chemicals via low temperature atmospheric pressure plasmas“. Thesis, University of York, 2018. http://etheses.whiterose.ac.uk/21237/.
Der volle Inhalt der QuelleSperatti, Alicia B. „Earthworm-microbial interactions influence carbon dioxide and nitrous oxide fluxes from agricultural soils“. Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101652.
Der volle Inhalt der QuelleRahman, Sayedur. „Canopy architecture, carbon gain and grain properties of native Australian rices: effects of elevated atmospheric carbon dioxide“. Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/27809.
Der volle Inhalt der QuelleLysyshyn, Kathleen E. „Carbon dioxide and methane fluxes and organic carbon accumulation in old field and northern temperate forest plantation soils“. Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31263.
Der volle Inhalt der QuelleDynamic and static chamber techniques were used to measure surface fluxes of CO2 and CH4, respectively, and soil gas concentrations were sampled with probes. In the old field and forest plantations, surface soil CO2 flux ranged from 2.9 to 27 g CO2 m-2 d-1 and 2.0 to 39 g CO2 m -2 d-1 respectively. Significant differences due to age and species of plantation were observed. Seasonal variations in CO2 efflux from the soil surface and within the soil profile were related to variation in soil temperature and moisture. Uptake of CH4 was observed at all sites and there was no significant differences in flux due to vegetation type or age. Maximum rate of CH4 consumption was 6.3 mg CH4 m-2 d-1. Methane uptake was positively related to soil moisture conditions.
The carbon content of the soil increased in all sites following the establishment of vegetation on sandy parent material. Carbon content was greatest in the upper soil profile. Rates of carbon accumulation ranged from 109 to 426 g m-2 y-1. Soil carbon increased with increasing age of plantation during the first 30 years following the establishment of vegetation on parent material, but declined as the forest plantation matured.
Rudmann, Silvia G., of Western Sydney Hawkesbury University, Faculty of Science and Technology und Centre for Horticulture and Plant Sciences. „Resource utilization of C4 tropical grasses at elevated CO2“. THESIS_FST_HPS_Rudmann_S.xml, 2000. http://handle.uws.edu.au:8081/1959.7/65.
Der volle Inhalt der QuelleDoctor of Philsophy (PhD)
Pepper, David A. „Investigation of the long term physiological response of Huon pine (Lagarostrobos franklinii) to changes in atmospheric CO2 and climate using stable isotopes“. Connect to full text, 1999. http://ses.library.usyd.edu.au/handle/2123/4032.
Der volle Inhalt der QuelleTitle from title screen (viewed February 12, 2009). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Biological Sciences, Faculty of Science. Degree awarded 2000; thesis submitted 1999. The 2 in the title is in subscript. Includes bibliographical references. Also available in print form.
Pongracic, Silvia School of Biological Sciences UNSW. „Influence of Irrigation and Fertilization on the Belowground Carbon Allocation in a Pine Plantation“. Awarded by:University of New South Wales. School of Biological Sciences, 2001. http://handle.unsw.edu.au/1959.4/18164.
Der volle Inhalt der QuelleWilson, Philip. „Insight into the carbon cycle from continuous measurements of oxygen and carbon dioxide at Weybourne Atmospheric Observatory, UK“. Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/42961/.
Der volle Inhalt der QuelleGascoigne-Owens, Johanna Sara. „Responses of the Câ‚„ plant Zea mays (maize) to elevated atmospheric carbon dioxide concentration“. Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414631.
Der volle Inhalt der QuelleCambaliza, Maria Obiminda L. „Measurement of forest ecosystem-atmosphere exchange of 8¹³C-CO₂ using Fourier transform infrared spectroscopy and disjunct eddy covariance“. Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/m_cambaliza_121709.pdf.
Der volle Inhalt der QuelleTitle from PDF title page (viewed on June 10, 2010). "Department of Civil and Environmental Engineering." Includes bibliographical references.
Pangga, Ireneo B. „Effects of elevated CO2 on plant architecture of Stylosanthes scabra and epidemiology of anthracnose disease /“. [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16215.pdf.
Der volle Inhalt der QuelleGhannoum, Oula, of Western Sydney Hawkesbury University, Faculty of Agriculture and Horticulture und School of Horticulture. „Responses of C3 and C4 Panicum grasses to CO2 enrichment“. THESIS_FAH_HOR_Ghannoum_O.xml, 1997. http://handle.uws.edu.au:8081/1959.7/139.
Der volle Inhalt der QuelleDoctor of Philosophy (PhD)
Souza, Amanda Pereira de. „A cana-de-açucar e as mudanças climaticas : efeitos de uma atmosfera enriquecida em 'CO IND. 2' sobre o crescimento, desenvolvimento e metabolismo de carboidratos de Saccharum ssp“. [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317739.
Der volle Inhalt der QuelleDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-09T03:07:16Z (GMT). No. of bitstreams: 1 Souza_AmandaPereirade_M.pdf: 752519 bytes, checksum: 0abdf68fd1d19b70a0af931741ccf052 (MD5) Previous issue date: 2007
Resumo: Desde o início da Revolução Industrial as concentrações de CO2 atmosférico aumentaram em cerca de 30% e estimativas apontam que esta concentração poderá atingir aproximadamente 720 ppm até a metade deste século. Estudos sobre o efeito do alto CO2 no desenvolvimento de diversas espécies vegetais já foram realizados, porém poucos com espécies de gramíneas tropicais do tipo C4, como é o caso da cana-de-açúcar. Considerando a importância econômica da cana e seu potencial na obtenção de biocombustíveis é importante saber como esta cultura irá responder ao aumento previsto na concentração de CO2 atmosférico. Sendo assim, o objetivo deste trabalho foi estudar o efeito do aumento do CO2 atmosférico sobre o crescimento, desenvolvimento e metabolismo de carboidratos da cana-de-açúcar visando avaliar o potencial de seqüestro de carbono e o impacto das mudanças climáticas sobre a produtividade. Parâmetros fisiológicos, bioquímicos e moleculares foram analisados em plantas cultivadas em câmaras de topo aberto durante 50 semanas com atmosfera de CO2 ambiente (~370 ppm) e elevada (~720 ppm). Os principais resultados obtidos indicam incremento em altura, na taxa fotossintética e em biomassa de colmo e folhas das plantas cultivadas sob elevado CO2. Ao final das 50 semanas foi detectado no colmo das plantas crescidas em tais condições, um aumento no teor de sacarose, de fibras e no conteúdo de celulose. A análise do perfil de transcritos de folhas após 9 e 22 semanas de cultivo usando microarranjos revelou expressão diferencial de 37 genes, sendo que 14 foram reprimidos e 23 foram induzidos e correspondem principalmente a genes de fotossíntese e desenvolvimento. Nossos resultados indicam que a cultura da cana-de-açúcar tem capacidade para seqüestro de carbono e potencial para aumento na produtividade em condições de alta concentração de CO2
Abstract: Since the beginning of the Industrial Revolution, the concentrations of CO2 in the atmosphere increased about 30% and the current forecasts point out that this concentration will reach approximately 720 ppm until the middle of this century. Studies about the effect of CO2 on the development of several plant species have been performed. However, few studies have been performed with tropical grass species having photosynthesis C4, as is the case of sugar cane. Due to the economic importance of sugar cane and its high potential to obtain biofuel, it is important to known how this crop will respond to the forecasted increase in the CO2 concentration in the atmosphere. Therefore, the goal of this work was to study the effects of increased CO2 concentration on growth, development and carbohydrate metabolism of sugar cane aiming the evaluation of the potential of this specie for carbon sequestration and the impact of the global climatic change on its productivity. Physiological, biochemical and molecular features of these plants have been analyzed during 50 weeks of growth in Open-Top-Chambers (OTCs) with ambient (~370 ppm) and elevated (~720 ppm) CO2 concentrations. After 50 weeks of growth under these conditions, we observed an increase of sucrose content, fiber an also in cellulose contents in stems of plants grown under elevated CO2. The microarray analysis of the transcriptome of leaves was obtained after 9 and 22 weeks and revealed differential expression of 37 genes. Fourteen genes were repressed and 23 induced by elevated CO2. The latter correspond mainly to the processes of photosynthesis and development. Our results indicate that the sugar cane crop has a high potential for carbon sequestration and increase of productivity under elevated CO2 concentrations
Mestrado
Biologia Celular
Mestre em Biologia Celular e Estrutural
Barlow, James Mathew. „Interpretation of observed atmospheric variations of CO2 and CH4“. Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10507.
Der volle Inhalt der QuelleSahlée, Erik. „Fluxes of Sensible and Latent Heat and Carbon Dioxide in the Marine Atmospheric Boundary Layer“. Doctoral thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8184.
Der volle Inhalt der QuelleOceans cover about 70% of the earth’s surface. They are the largest source of the atmospheric water vapour and act as enormous heat reservoirs. Thus in order to predict the future weather and climate it is of great importance to understand the processes governing the exchange of water vapour and heat between the ocean and atmosphere. This exchange is to a large extent mediated by turbulent eddies. Current numerical climate and weather forecast models are unable to resolve the turbulence, which means that the turbulent exchange needs to be simplified by using parameterizations.
Tower based measurements at the Östergarnsholm Island in the Baltic Sea have been used to study the air-sea turbulent exchange of latent and sensible heat and the heat flux parameterizations. Although the measurements are made at an island, data obtained at this site is shown to represent open ocean conditions during most situations for winds coming from the east-south sector. It is found that during conditions with small air-sea temperature differences and wind speeds above 10 m s-1, the structure of the turbulence is re-organized. Drier and colder air from aloft is transported to the surface by detached eddies, which considerably enhance the turbulent heat fluxes. The fluxes where observed to be much larger than predicted by current state-of-the-art parameterizations. The turbulence regime during these conditions is termed the Unstable Very Close to Neutral Regime, the UVCN-regime.
The global increase of the latent and sensible heat fluxes due to the UVCN-regime is calculated to 2.4 W m-2 and 0.8 W m-2 respectively. This is comparable to the current increase of the radiative forcing due to anthropogenic emissions of greenhouse gases, reported in Intergovernmental Panel on Climate Change fourth assessment report (IPCC AR4). Thus the UVCN-effect could have a significant influence when predicting the future weather and climate.
Klappenbach, Friedrich Wilhelm [Verfasser], und J. [Akademischer Betreuer] Orphal. „Mobile spectroscopic measurements of atmospheric carbon dioxide and methane / Friedrich Wilhelm Klappenbach ; Betreuer: J. Orphal“. Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1114312576/34.
Der volle Inhalt der QuelleCogan, Austin James. „Atmospheric carbon dioxide retrieved from the Greenhouse gases Observing SATellite : method, comparisons and algorithm development“. Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/27690.
Der volle Inhalt der QuelleCunniff, Jennifer. „The roles of atmospheric carbon dioxide and plant ecological traits in the origin of agriculture“. Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515436.
Der volle Inhalt der QuelleCharalambous, Charithea. „Temperature swing adsorption process for carbon dioxide capture, purification and compression directly from atmospheric air“. Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33311.
Der volle Inhalt der QuelleWang, Xianzhong. „Gender-specific and intraspecific responses of Trembling Aspen (Populus Tremuloides) to elevated atmospheric Carbon Dioxide /“. The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488192119266776.
Der volle Inhalt der Quelle