Post Doctoral Research Associate
<p>My main research interests are in understanding geological processes that control environmental conditions at the surface of the Earth by developing and using chemical and isotopic proxies, particularly non-traditional stable isotope systems. My current projects focus on comprehending modern and past environments and on investigating the distribution of isotopes in nature and the biogeochemical mechanisms that fractionate these isotopes. This specifically includes:</p><ul><li><em>Determining past levels of global seawater oxygenation.</em>I am currently working on establishing a multi-proxy (Mo, Re and U stable isotopes) record of global ocean oxygenation spanning the large climatic gradient of the Early Cenozoic (56-25 Ma). The combination of proxies with different residence times in the ocean and different sensitivities to oxygen concentration in seawater will allow us to refine our knowledge of past global seawater oxygenation variations and to get a better understanding of the dominant factors driving episodes of oceanic anoxia.</li></ul><p> </p><ul><li><em>Investigating the potential of Li isotopes as tracers for weathering processes</em>. Li isotopes show major fractionation during the weathering of continental silicate minerals as the lighter isotope is preferentially retained in clay minerals. Variations in Li isotope signatures in the surface environment can thus provide us with crucial information on present and past clay production and thus weathering rates, which are intrinsically related to climate. I have investigated Li fractionation processes both at the scale of water-rock interactions in the Strengbach watershed (<a href="http://ohge.unistra.fr/" rel="nofollow">OHGE</a>, Vosges Mountains, France), and at the continental scale by studying Li signatures of groundwater discharge to the Bay of Bengal. I am also interested in developing the potential of Li isotopes as a proxy for quantifying past weathering processes.</li></ul><p> </p><ul><li><em>Tracing chemical fluxes in permafrost regions.</em>Boreal regions probably will be among the areas most sensitive to climate change. The destabilisation of the permafrost, in particular, will lead to major environmental disruptions. Thus, it is critical to understand the functioning of permafrost ecosystems so we can identify their response to global warming. I have studied the watershed of the Nizhnaya Tunguska (main tributary of the Yenisei river) in Central Siberia where I investigated the sources and pathways of dissolved chemical fluxes, the biogeochemical cycling of elements, and soil dynamics using a wide range of isotopic tools such as Sr and Ca isotopes and U-series disequilibria.</li></ul>
<p><span>I am a Post Doctoral Research Associate specialising in low-temperature isotope geochemistry. I have been working in the</span>Environment, Earth& Ecosystems department since October 2013, within<span>the</span><span><u><a href="http://palaeoenvironmentalchange.org/" rel="nofollow"><span>Palaeoenvironmental Change Research Group</span></a></u></span><span>.</span></p><p><span>My research is focused on</span><span>understanding present and past geochemical surface processes and their interplay with climate. At the OU, I am currently working on the NERC-funded research project“Response of Global Ocean Oxygenation to Early Cenozoic Climate Extremes</span><span>”</span><span>.</span></p><p><em>Qualification </em></p><p>Ph.D. in Environmental Geochemistry (Oct. 2010), University of Strasbourg, France <i>Title: Geochemical and multi-isotopic study of Siberian watersheds. Sources of dissolved chemical fluxes and characterization of soil-water-plant chemical transfers in a permafrost environment</i>(Advisors: F. Chabaux, O.S. Pokrovsky)</p><p><em>Previous Appointments</em></p><ul><li>Mar. 2013– Aug. 2013 Postdoctoral Research Fellow, University of Strasbourg, France</li><li>Apr. 2011 - Dec. 2012 Post Doctoral Research Associate, University of Southern California, Los Angeles, USA</li><li>Oct. 2009 - Dec. 2010 Research and Teaching Fellow, University of Strasbourg, France</li><li>Oct. 2006 - Oct. 2009 Teaching Assistant, University of Strasbourg, France</li></ul><p> </p>
Dr Marie-Laure Bagard
Bagard
M.
Marie-Laure
M. L.
M.-L.
570e801d1b16a5921376a07fe339e0eaa72440d0
Marie-Laure Bagard
M. Bagard
M. L. Bagard
M.-L. Bagard
Dr
<p><span>I am a Post Doctoral Research Associate specialising in low-temperature isotope geochemistry. I have been working in the</span>Environment, Earth& Ecosystems department since October 2013, within<span>the</span><span><u><a href="http://palaeoenvironmentalchange.org/" rel="nofollow"><span>Palaeoenvironmental Change Research Group</span></a></u></span><span>.</span></p><p><span>My research is focused on</span><span>understanding present and past geochemical surface processes and their interplay with climate. At the OU, I am currently working on the NERC-funded research project“Response of Global Ocean Oxygenation to Early Cenozoic Climate Extremes</span><span>”</span><span>.</span></p><p><em>Qualification </em></p><p>Ph.D. in Environmental Geochemistry (Oct. 2010), University of Strasbourg, France <i>Title: Geochemical and multi-isotopic study of Siberian watersheds. Sources of dissolved chemical fluxes and characterization of soil-water-plant chemical transfers in a permafrost environment</i>(Advisors: F. Chabaux, O.S. Pokrovsky)</p><p><em>Previous Appointments</em></p><ul><li>Mar. 2013– Aug. 2013 Postdoctoral Research Fellow, University of Strasbourg, France</li><li>Apr. 2011 - Dec. 2012 Post Doctoral Research Associate, University of Southern California, Los Angeles, USA</li><li>Oct. 2009 - Dec. 2010 Research and Teaching Fellow, University of Strasbourg, France</li><li>Oct. 2006 - Oct. 2009 Teaching Assistant, University of Strasbourg, France</li></ul><p> </p>