<div dir="ltr"><br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Hatté Christine</b> <span dir="ltr">&lt;<a href="mailto:Christine.Hatte@lsce.ipsl.fr">Christine.Hatte@lsce.ipsl.fr</a>&gt;</span><br>
<div style="word-wrap:break-word"><div><br></div><div><p>On the use of isotopic tracers of carbon (13C and 14C) to constraint the soil carbon dynamic in the continental biosphere model ORCHIDEE.</p><p>The role of soil carbon in the climate dynamic is one of the major uncertainties in the Earth system models used to predict future climate change. A method to reduce such uncertainties is the use of sites data obtained on very contrasted situations to better constraint the parameters controlling the organic matter mineralization. However, regarding the very simple representation of the soil organic matter dynamic in such model, the comparison with data is very complex. One of the promising approaches emerging from literature is the use of carbon isotopes data (13C and 14C) that can be considered as integrators of the soil carbon dynamic for time scales (year to century) coherent with the carbon cycle anthropogenic perturbation time scale. The thesis objective will be the utilization of existing isotopic data completed by new samples if necessary to better constrain the soil carbon dynamic of the IPSL continental biosphere model, the ORCHIDEE model. First, a data analysis will be necessary and then the model will be improve by the representation of more realistic mechanisms and in particular microbial related mechanisms that control the soil carbon dynamic. This thesis will be done within a high level network of national and international collaboration giving the opportunity to the candidate to develop a double skill in isotopic biogeochemistry and in modelling.</p>
<div>The candidate should have a Master diploma and have experience in either mathematical representation of processes or geochemistry, biogeochemistry, ecophysiology or functional ecology.</div><div>PhD supervisors: Bertrand Guénet (LSCE) and Christine Hatté (LSCE)</div>
<p>host laboratory: LSCE (Laboratoire des Sciences du Climat et de l&rsquo;Environnement), Saclay, France</p><p>contact: Bertrand Guénet (bertrand.guenet..at..<a href="http://lsce.ipsl.fr" target="_blank">lsce.ipsl.fr</a>) and Christine Hatté (christine.hatte..at..<a href="http://lsce.ipsl.fr" target="_blank">lsce.ipsl.fr</a>)</p>
<div>Applications should included a CV, a 1-2 page cover letter, electronic copies of all diplomas and of transcripts (from baccalauréat, i.e. the UK A-level or the US high school diploma) &nbsp;and the contact information of referee(s) or recommendation letter(s)</div>
<br>deadline for application: March 31th, 2014.<br><div><span style="border-collapse:separate;border-spacing:0px"><div style="font-family:Arial"></div></span></div></div><div><br></div><br><br><div>
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<br><br></div><div style="font-style:normal;font-size:12px;font-family:Arial">********************************</div><div><p class="MsoNormal" style="margin-bottom:0.0001pt"></p><p class="MsoNormal" style="margin-bottom:0.0001pt">
<font color="#244061" face="&#39;Times New Roman&#39;"><span style="font-size:20px"><i></i></span></font></p><p class="MsoNormal" style="margin-bottom:0.0001pt"><font color="#244061" face="&#39;Times New Roman&#39;"><i><i><span style="font-size:13pt;font-family:&#39;Times New Roman&#39;;color:rgb(36,64,97)">Christine HATTÉ<u></u><u></u></span></i></i></font></p>
<p></p><div style="margin-right:0cm;font-style:normal;font-size:12px;margin-left:14.2pt;margin-bottom:0.0001pt;font-family:Arial;margin-top:0cm"><span style="font-family:&#39;Times New Roman&#39;">L.S.C.E.<u></u><u></u></span></div>
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<div style="margin-right:0cm;font-style:normal;font-size:12px;margin-left:14.2pt;margin-bottom:0.0001pt;font-family:Arial;margin-top:0cm"><span style="font-family:&#39;Times New Roman&#39;">Domaine du CNRS<u></u><u></u></span></div>
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<span style="font-family:&#39;Times New Roman&#39;;font-size:12px">email: &nbsp;<a href="mailto:christine.hatte@lsce.ipsl.fr" target="_blank">christine.hatte@lsce.ipsl.fr</a></span></div></span></span></span></span></span></div>
</span><span style="font-family:&#39;Times New Roman&#39;;font-size:12px">page: &nbsp;</span><span style="font-family:&#39;Times New Roman&#39;;font-size:12px"><a href="mailto:christine.hatte@lsce.ipsl.fr" target="_blank">http://www.lsce.ipsl.fr/Pisp/12/christine.hatte.html</a></span></div>
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