Atmos. Chem. Phys. Discuss., 12, 12759-12800, 2012
© Author(s) 2012. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Evaluation of atmosphere-biosphere exchange estimations with TCCON measurements
J. Messerschmidt1, N. Parazoo2, N. M. Deutscher3, C. Roehl1, T. Warneke3, P. O. Wennberg1, and D. Wunch1
1California Institute of Technology, Pasadena, CA, USA
2Jet Propulsion Laboratory, Pasadena, CA, USA
3Institute of Environmental Physics, Bremen, Germany

Abstract. Three estimates of the atmosphere-biosphere exchange are evaluated using Total Carbon Column Observing Network (TCCON) measurements. We investigate the Carnegie-Ames-Stanford Approach (CASA), the Simple Biosphere (SiB) and the GBiome-BGC models transported by the GEOS-Chem model to simulate atmospheric CO2 concentrations for the time period between 2006 and 2010. The CO2 simulations are highly dependent on the choice of the atmosphere-biosphere model and large-scale errors in the estimates are identified through a comparison with TCCON data. Enhancing the CO2 uptake in the boreal forest by 40% and shifting the onset of the growing season significantly improve the simulated seasonal CO2 cycle using CASA estimates. The SiB model gives the best estimate for the atmosphere-biosphere exchange in the comparison with TCCON measurements.

Citation: Messerschmidt, J., Parazoo, N., Deutscher, N. M., Roehl, C., Warneke, T., Wennberg, P. O., and Wunch, D.: Evaluation of atmosphere-biosphere exchange estimations with TCCON measurements, Atmos. Chem. Phys. Discuss., 12, 12759-12800, doi:10.5194/acpd-12-12759-2012, 2012.
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