Assimilation of TES CO into a global CTM: first results

N. A. D. Richards, Q. Li, K. W. Bowman, J. R. Worden, S. S. Kulawik, G. B. Osterman, H. M. Worden, J.-F. Lamarque, B. V. Khattatov
2006 Atmospheric Chemistry and Physics Discussions  
We present results from the first assimilation of carbon monoxide (CO) observations from the Tropospheric Emission Spectrometer (TES) into a global three-dimensional (3-D) chemistry and transport model (CTM). A sequential sub-optimal Kalman filter assimilation scheme (Khattatov et al., 2000) was applied to assimilate TES CO pro-5 files during November 2004 into the GEOS-Chem global 3-D CTM. The assimilation results were compared with MOPITT and MOZAIC observations. The assimilation
more » ... improves model simulation of CO in the middle to upper troposphere, where the MOPITT versus model bias was reduced by up to two-thirds. Assimilation results show higher levels of CO in the southern tropics, consistent with MOPITT observa-10 tions. We find good agreement between the TES assimilated model estimates of CO and in situ measurements from the MOZAIC program, which shows a negative bias of up to 10 ppbv in middle and upper tropospheric TES CO. The results demonstrate how assimilation can be used for non-coincident validation of TES CO profile retrievals.
doi:10.5194/acpd-6-11727-2006 fatcat:kn5vtrstx5egziys46yaqquez4