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Zhengxi Tan, Ph.D. 
SAIC, USGS Center for Earth Resources Observation and Science (EROS)
47914 252nd Street
Sioux Falls, SD 57198
Phone: (605)594-6903
Fax: (605)594-6529
Email: [EMAIL PROTECTED]


USGS Mendenhall Postdoctoral Position
We seek a highly qualified post-doctoral scientist (Mendenhall Fellow) to 
do original research on how changes in fire frequency and altered climate 
act together to influence permafrost thawing, emissions of greenhouse 
gases, alteration of discharge pathways of surface water, etc. The policy 
implications of the research will be identified in terms of wildfire 
impacts on ecosystem services (i.e., the transformation of a set of 
natural assets into human benefits), including the potential disruption of 
native subsistence cultures.
We hypothesize that the amount of carbon release from fires depends upon 
land cover type, burn severity, ground wetness, and the thickness and 
carbon density of the pre-fire organic matter layer. We will use data from 
multiple spatial and temporal scales to test this hypothesis and estimate 
the carbon release from wildfires. Historical wildfire records, 
reconstructed land cover history, soil, and permafrost data will be 
integrated into the General Ensemble biogeochemical Modeling System (GEMS) 
and the Erosion-Deposition Carbon Model (EDCM). 
The postdoctoral scientist will be a part of the Yukon River Basin 
project, a major new activity of the USGS which integrates numerous 
agencies with an international component and which supports the 
International Polar Year (IPY). Results from this research will be used to 
assess the impacts of land surface disturbance and climate change at local 
to regional scales.  This will assist policymakers and land managers to 
gauge the sensitivity of particular ecosystems and Alaskan communities to 
wildfires. This will also improve scientific understanding of feedbacks to 
climatic change. 
Mendenhall Fellows are appointed to the USGS for two years and receive 
full salary and benefits at the GS-12 level. The 2006 base salary for a 
GS-12 is $62,291. The appropriate personnel office can provide the exact 
salary for other areas. Appointments will begin between October 2007 and 
March 2008, depending on availability of funds. 

Application Closing Date: November 15, 2006.

Proposed Duty Station: Sioux Falls, SD
Qualifications: A Ph.D. in an ecological or natural science with a strong 
biogeochemical modeling capability is essential. Familiarity with remote 
sensing and geographic information systems is desired. In order to be 
considered for these opportunities, candidates must: 
        1. have successfully completed a Ph.D. in an area described in the 
Research Opportunity. The Ph.D. degree requirements must have been met no 
earlier than November 15, 2001, and must be completed by the time 
employment starts (no later than March 2008); 
        2. meet the qualification requirements described in the Research 
Opportunity at http://geology.usgs.gov/postdoc/2008/research.html. 
How to Apply: please check http://geology.usgs.gov/postdoc/. 

Research advisor contact: Larry L. Tieszen, (605) 594-6056, 
[EMAIL PROTECTED]; or Zhengxi Tan, (605) 594-6903, [EMAIL PROTECTED]

Personnel Office contact: Kathleen Scheich, (303) 236-9581, 
[EMAIL PROTECTED]

(This type of research is performed by those who have backgrounds for the 
occupations stated above. However, other titles may be applicable 
depending on the applicant's background, education, and research proposal. 
The final classification of the position will be made by the Personnel 
specialist.) 

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