Modeling global atmospheric CO2 with improved emission inventories and CO2 production from the oxidation of other carbon species

R. Nassar, D. B. A. Jones, P. Suntharalingam, J. M. Chen, R. J. Andres, K. J. Wecht, R. M. Yantosca, S. S. Kulawik, K. W. Bowman, J. R. Worden, T. Machida, H. Matsueda
2010 Geoscientific Model Development Discussions  
The use of global three-dimensional (3-D) models with satellite observations of CO 2 in inverse modeling studies is an area of growing importance for understanding Earth's carbon cycle. Here we use the GEOS-Chem model (version 8-02-01) CO 2 mode with multiple modifications in order to assess their impact on CO 2 forward simulations. Modifications include CO 2 surface emissions from shipping (∼ 0.19 Pg C yr −1 ), 3-D spatially-distributed emissions from aviation (∼0.16 Pg C yr −1 ), and 3-D
more » ... −1 ), and 3-D chemical production of CO 2 (∼1.05 Pg C yr −1 ). Although CO 2 chemical production from the oxidation of CO, CH 4 and other carbon gases is recognized as an important contribution to global CO 2 , it is typically accounted for by conversion from its precursors at the surface rather than in the free troposphere. We base our model 3-D spatial distribution of CO 2 chemical production on monthly-averaged loss rates of CO (a key precursor and intermediate in the oxidation of organic carbon) and apply an associated surface correction for inventories that have counted emissions of CO 2 precursors as CO 2 . We also explore the benefit of assimilating satellite observations of CO into GEOS-Chem to obtain an observation-based estimate of the CO 2 chemical source. The CO assimilation
doi:10.5194/gmdd-3-889-2010 fatcat:rni6wrpzjfbjbhptbj32dlvarm