References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-3867-2008

Diagnosing recent CO emissions and ozone evolution in East Asia using coordinated surface observations, adjoint inverse modeling, and MOPITT satellite data

Tanimoto

¹ ⁸ Sawa

² Yonemura

³ Yumimoto

⁴ Matsueda

² Uno

⁴ Hayasaka

⁵ Mukai

¹ Tohjima

¹ Tsuboi

⁶ Zhang

⁷

National Institute for Environmental Studies, Tsukuba, Japan

Meteorological Research Institute, Tsukuba, Japan

National Institute for Agro-Environmental Sciences, Tsukuba, Japan

Kyushu University, Fukuoka, Japan

Research Institute for Humanity and Nature, Kyoto, Japan

Japan Meteorological Agency, Tokyo, Japan

Harvard University, Cambridge, MA, USA

also at: Harvard University, Cambridge, MA, USA

22 07 2008

8 14 3867 3880

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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 chemistry 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. The observed ΔO3/ΔCO ratios show increasing tendency during eastward transport events due likely to en-route photochemical O3 formation, suggesting that East Asia is an important O3 source region during spring.

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