Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 6 2009 10.5194/acpd-9-24875-2009 http://www.atmos-chem-phys-discuss.net/9/24875/2009/ http://www.atmos-chem-phys-discuss.net/9/24875/2009/acpd-9-24875-2009.html http://www.atmos-chem-phys-discuss.net/9/24875/2009/acpd-9-24875-2009.pdf 24875 24911 2009-11-20 Analysis of global and regional CO burdens measured from space between 2000 and 2009 and validated by ground-based solar tracking spectrometers L. N. Yurganov yurganov@umbc.edu W. McMillan E. Grechko A. Dzhola Joint Center for Earth System Technology, University of Maryland Baltimore County, Baltimore, MD, USA Obukhov Institute of Atmospheric Physics, Moscow, Russia CO total column (TC) retrievals from MOPITT version 3 and AIRS version 5 are validated through comparisons with archived TC data from the Network for Detection of Atmospheric Composition Change (NDACC) ground-based Fourier Transform Spectrometers (FTS) between March 2000 and December 2007. MOPITT retrievals exhibit an increasing temporal bias with a rate of 1.4–1.8% per year; thus far, AIRS retrievals appear to be more stable. For the lowest CO values in the Southern Hemisphere (SH), AIRS TC retrievals overestimate FTS TC by 20%. MOPITT's bias and standard deviation do not depend on CO TC absolute values. Empirical corrections are derived for AIRS and MOPITT retrievals based on the observed annually averaged bias versus the FTS TC. With these corrections, CO burdens from AIRS and MOPITT come into good agreement in the mid-latitudes of the Northern Hemisphere (NH) and in the tropical belt. In the SH, agreement between AIRS and MOPITT CO burdens is better for the larger CO TC in austral winter and worse in austral summer when CO TC are smaller. Interannual variations in AIRS and MOPITT retrieved CO burdens are compared with CO emissions from wild fires from the Global Fire Emission Dataset (GFED2) inventory. Before July 2008, all variations in retrieved CO burden can be explained by changes in fire emissions. After July 2008, global and tropical CO burdens decreased until October before recovering by the beginning of 2009. The NH CO burden also decreased but reached a minimum in January 2009 before starting to recover. The decrease in tropical CO burdens is explained by lower than usual fire emissions in South America and Indonesia. 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