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The zonal structure of tropical O<sub>3</sub> and CO as observed by the Tropospheric Emission Spectrometer in November 2004 – Part 1: Inverse modeling of CO emissions

Jones D, Bowman K, Logan J, Heald C, Liu J, Luo M, Worden J, Drummond J ...see all

Atmospheric Chemistry and Physics, vol. 9, issue 11 (2009) pp. 3547-3562

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Abstract

We conduct an inverse modeling analysis of measurements of atmospheric
CO from the TES and MOPITT satellite instruments using the GEOS-Chem
global chemical transport model to quantify emissions of CO in the
tropics in November 2004. We also assess the consistency of the
information provided by TES and MOPITT on surface emissions of CO. We
focus on the tropics in November 2004, during the biomass burning
season., because TES observations of CO and O-3 and MOPITT observations
of CO reveal significantly greater abundances of these gases than
simulated by the GEOS-Chem model during that period. We find that both
datasets suggest substantially greater emissions of CO from
sub-equatorial Africa and the Indonesian/Australian re-ion than in the
climatological emissions in the model. The a posteriori emissions from
sub-equatorial Africa based on TES and MOPITT data were 173 Tg CO/yr and
184 Tg CO/yr, respectively, compared to the a priori of 95 Tg CO/yr. In
the Indonesian/Australian region, the a posteriori emissions inferred
from TES and MOPITT data were 155 Tg CO/yr and 185 Tg CO/yr,
respectively, whereas the a priori was 69 Tg CO/yr. The differences
between the a posteriori emission estimates obtained from the two
datasets are generally less than 20%. The a posteriori emissions
significantly improve the simulated distribution of CO, however, large
regional residuals remain, and are likely due to systematic errors in
the analysis. Reducing these residuals and improving the accuracy of
top-down emission estimates will require better characterization of
systematic errors in the observations and the model (chemistry and
transport).

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Authors

  • D. B. a. Jones

  • K. W. Bowman

  • J. a. Logan

  • C. L. Heald

  • J. Liu

  • M. Luo

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