Atmos. Chem. Phys. Discuss., 8, 3525-3561, 2008
www.atmos-chem-phys-discuss.net/8/3525/2008/
doi:10.5194/acpd-8-3525-2008
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Diagnosing recent CO emissions and springtime O3 evolution in East Asia using coordinated ground-based observations of O3 and CO during the East Asian Regional Experiment (EAREX) 2005 campaign
H. Tanimoto1,*, Y. Sawa2, S. Yonemura3, K. Yumimoto4, H. Matsueda2, I. Uno4, T. Hayasaka5, H. Mukai1, Y. Tohjima1, K. Tsuboi6, and L. Zhang7
1National Institute for Environmental Studies, Tsukuba, Japan
2Meteorological Research Institute, Tsukuba, Japan
3National Institute for Agro-Environmental Sciences, Tsukuba, Japan
4Kyushu University, Fukuoka, Japan
5Research Institute for Humanity and Nature, Kyoto, Japan
6Japan Meteorological Agency, Tokyo, Japan
7Harvard University, Cambridge, MA, USA
*also at: Harvard University, Cambridge, MA, USA

Abstract. Simultaneous ground-based measurements of ozone (O3) and carbon monoxide (CO) were conducted in March 2005 as part of the East Asian Regional Experiment (EAREX) 2005 under the umbrella of the Atmospheric Brown Clouds (ABC) project. Multiple air quality monitoring networks were integrated by performing intercomparison of individual calibration standards and measurement techniques to ensure comparability of ambient measurements, along with providing consistently high time-resolution measurements of O3 and CO at the surface sites in East Asia. Ambient data collected from eight surface stations were compared with simulation results obtained by a regional chemical transport model to infer recent changes in CO emissions from East Asia. Our inverse estimates of the CO emissions from China up to 2005 suggested an increase of 16% since 2001, in good agreement with the recent MOPITT satellite observations and the bottom-up estimates up to 2006. The O3 enhancement relative to CO in continental pollution plumes traversed in the boundary layer were examined as a function of transport time from the Asian continent to the western Pacific Ocean. Comparison of the observed δO3/Δ CO ratios and their modeled spatial distributions suggests an increase in the Δ O3/Δ CO ratio due likely to en-route photochemical O3 formation during eastward transport, confirming that East Asia is an important O3 source region during spring.

Citation: Tanimoto, H., Sawa, Y., Yonemura, S., Yumimoto, K., Matsueda, H., Uno, I., Hayasaka, T., Mukai, H., Tohjima, Y., Tsuboi, K., and Zhang, L.: Diagnosing recent CO emissions and springtime O3 evolution in East Asia using coordinated ground-based observations of O3 and CO during the East Asian Regional Experiment (EAREX) 2005 campaign, Atmos. Chem. Phys. Discuss., 8, 3525-3561, doi:10.5194/acpd-8-3525-2008, 2008.
 
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