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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Dear Colleagues:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I would like your help in identifying potential candidates for a two-year USDA-ARS post-doc position that is available in Fort Collins, Colorado. Quantitative understanding of rangeland ecosystems
is essential for this position. Experience in system modeling, climate change, and computer language programming (Python, R, Fortran) is desirable. However, the incumbent should be willing to learn rangeland systems modeling and data analyses. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">US citizenship is required, and the candidates should have received their Ph. D. within the last 4 years. Interested candidates may send resume directly to Dr. Liwang Ma at
<a href="mailto:Liwang.Ma@usda.gov">Liwang.Ma@usda.gov</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Thank you for your time.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Liwang Ma<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Soil Scientist, USDA-ARS<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Fort Collins<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">Position Description:</span></b><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Complexity of western US grazing land ecosystems, due to heterogeneous soils, diverse plant<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">communities, and highly variable intra- and inter-annual precipitation, often precludes<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">disentangling management and environment effects on primary (aboveground biomass) and<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">secondary (livestock weight gain) production. The APEX model has recently been enhanced by ARS<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">and Texas A&M scientists to better represent grazing impacts using data collected from two<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Long-Term Agroecosystem Research (LTAR) network sites in contrasting environments, semiarid<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">(Central Plains Experimental Range) and mesic (Texas Gulf). Projected climate change increases<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">in extreme events (droughts and deluges) present ranchers and land managers with novel<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">problems that need science-informed solutions. The objectives of this position are to incorporate <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">new findings from recent climate extreme experiments into the APEX grazing land model and to simulate the impact of extreme events on primary and secondary production on grazing lands. Specifically, <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">the incumbent will (1) calibrate and validate the APEX model for extreme events using multi-decadal <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">primary and secondary production data and (2) extend the improved APEX model to <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">estimate primary and secondary production in Great Plains grazing lands for mid-late 21st century <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">climate as projected by the Global Circulation Models (GCMs).<o:p></o:p></span></p>
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