Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-3525-2008
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http://www.atmos-chem-phys-discuss.net/8/3525/2008/acpd-8-3525-2008.pdf
3525
3561
2008-02-20
Diagnosing recent CO emissions and springtime O<sub>3</sub> evolution in East Asia using coordinated ground-based observations of O<sub>3</sub> and CO during the East Asian Regional Experiment (EAREX) 2005 campaign
H. Tanimoto
Y. Sawa
S. Yonemura
K. Yumimoto
H. Matsueda
I. Uno
T. Hayasaka
H. Mukai
Y. Tohjima
K. Tsuboi
L. Zhang
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
Simultaneous ground-based measurements of ozone (O<sub>3</sub>) 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
O<sub>3</sub> 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 O<sub>3</sub> 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 δO<sub>3</sub>/Δ CO ratios and their
modeled spatial distributions suggests an increase in the Δ O<sub>3</sub>/Δ CO ratio due likely to en-route photochemical O<sub>3</sub>
formation during eastward transport, confirming that East Asia is an
important O<sub>3</sub> source region during spring.
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