Environmental Science Division (EVS)a Division of Argonne National Laboratory
Predictive environmental understanding

Assessment of Climatic Variability and Management Effects on Ecosystems Using Different Research Tools and Methods

Monday, July 29, 2019

Dr. Rajen Bajgain
Postdoctoral Research Associate
The University of Oklahoma
Monday, July 29, 2019
1:00 P.M. – 2:00 P.M.
Argonne National Laboratory
Building 240
Room 4301

Climatic and management factors in isolation or in combination influence the ecosystem properties and the energy, water, and elements. The considerable uncertainity is associated with the model projections due to the complex interactions and diverse nature of ecosystem variables under variable climatic and management conditions.

Dr. Bajgain's research focuses on use of various tools and methods such as field observations (eddy covariance and automated chamber), remote sensing data, and process-based, light use efficiency and statistical models to quantify biophysical and biogeochemical feedbacks of ecosystems to climate and management variability. A new drought algorithm was developed and tested to understand the response of tallgrass prairie to drought in the Southern Great Plains. Eddy covariance data showed that grassland converted to winter wheat was a net source of carbon at an annual scale.

Results from both statistical regression and biogenic models tested with the field measured data showed that human management coupled with weather events alterd the biophysical properties and biogeochemistry of ecosystems, resulting into higher greeenhouse gas emissions. The results highlight the importance of assesing and quantifying ecosystem responses to climatic and management factors and this information can be used to reduce the uncertainity of model projections.

Dr. Rajen Bajgain
Dr. Rajen Bajgain
portrait of Roser Matamala