Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1079
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
17 Jan 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Global O3-CO Correlations in a Chemistry and Transport Model during July–August: Evaluation with TES Satellite Observations and Sensitivity to Input Meteorological Data and Emissions
Hyun-Deok Choi1, Hongyu Liu1, James H. Crawford2, David B. Considine2,a, Dale J. Allen3, Bryan N. Duncan4, Larry W. Horowitz5, Jose M. Rodriguez4, Susan E. Strahan4,6, Lin Zhang7,b, Xiong Liu7, Megan R. Damon4,8, and Stephen D. Steenrod4,6 1National Institute of Aerospace, Hampton, VA
2NASA Langley Research Center, Hampton, VA
3University of Maryland, College Park, MD
4NASA Goddard Space Flight Center, Greenbelt, MD
5NOAA Geophysical Fluid Dynamic s Laboratory, Princeton, NJ
6Universities Space Research Association, Columbia , MD
7Harvard University, Cambridge, MA
8Science Systems and Applications, Inc., Lanham, MD
anow at: NASA Headquarters, Washington, D.C.
bnow at: Peking University, Beijing, China
Abstract. We examine the capability of the Global Modeling Initiative (GMI) chemistry and transport model to reproduce global mid-tropospheric (618 hPa) O3-CO correlations determined by the measurements from Tropospheric Emission Spectrometer (TES) aboard NASA’s Aura satellite during boreal summer (July–August). The model is driven by three meteorological data sets (fvGCM with sea surface temperature for 1995, GEOS4-DAS for 2005, and MERRA for 2005), allowing us to examine the sensitivity of model O3-CO correlations to input meteorological data. Model simulations of radionuclide tracers (222Rn, 210Pb, and 7Be) are used to illustrate the differences in transport-related processes among the meteorological data sets. Simulated O3 values are evaluated with climatological ozone profiles from ozonesonde measurements and satellite tropospheric O3 columns. Despite the fact that the three simulations show significantly different global and regional distributions of O3 and CO concentrations, all simulations show similar patterns of O3-CO correlations on a global scale. These patterns are consistent with those derived from TES observations, except in the tropical easterly biomass burning outflow regions. Discrepancies in regional O3-CO correlation patterns in the three simulations may be attributed to differences in convective transport, stratospheric influence, and subsidence, among other processes. To understand how various emissions drive global O3-CO correlation patterns, we examine the sensitivity of GMI/MERRA model-calculated O3 and CO concentrations and their correlations to emission types (fossil fuel, biomass burning, biogenic, and lightning NOx emissions). Fossil fuel and biomass burning emissions are mainly responsible for the strong positive O3-CO correlations over continental outflow regions in both hemispheres. Biogenic emissions have a relatively smaller impact on O3-CO correlations than other emissions, but are largely responsible for the negative correlations over the tropical eastern Pacific, reflecting the fact that O3 is consumed and CO generated during the atmospheric oxidation process of isoprene under low NOx conditions. We find that lightning NOx emissions degrade both positive correlations at mid-/high- latitudes and negative correlations in the tropics because ozone production downwind of lightning NOx emissions is not directly related to the emission and transport of CO. Our study concludes that O3-CO correlations may be used effectively to constrain the sources of regional tropospheric O3 in global 3-D models, especially for those regions where convective transport of pollution plays an important role.

Citation: Choi, H.-D., Liu, H., Crawford, J. H., Considine, D. B., Allen, D. J., Duncan, B. N., Horowitz, L. W., Rodriguez, J. M., Strahan, S. E., Zhang, L., Liu, X., Damon, M. R., and Steenrod, S. D.: Global O3-CO Correlations in a Chemistry and Transport Model during July–August: Evaluation with TES Satellite Observations and Sensitivity to Input Meteorological Data and Emissions, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1079, in review, 2017.
Hyun-Deok Choi et al.
Hyun-Deok Choi et al.
Hyun-Deok Choi et al.

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Short summary
We evaluate global O3-CO correlations in a chemistry and transport model during July–August with TES/Aura satellite observations and examine the sensitivity of model simulations to input meteorological data and emissions. Results show that O3-CO correlations may be used effectively to constrain the sources of regional tropospheric O3 in global 3-D models, especially for those regions where convective transport of pollution plays an important role.
We evaluate global O3-CO correlations in a chemistry and transport model during July–August with...
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