HR: 1340h
AN: A23A-0768    [Abstracts]
TI: Tropospheric Nitrogen Dioxide Amounts Obtained by GOME Over East Asia in 1996-2002: Validation and Trend Analyses
AU: * Irie, H
EM: irie@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Sudo, K
EM: kengo@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Akimoto, H
EM: akimoto@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Richter, A
EM: andreas.richter@iup.physik.uni-bremen.de
AF: Institute of Environmental Physics, University of Bremen, P.O. Box 33 04 40, Bremen, 28334 Germany
AU: Wagner, T
EM: thomas.wagner@iup.uni-heidelberg.de
AF: Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, Heidelberg, 69120 Germany
AU: Wenig, M
EM: wenig@hyperion.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 916: The Atmospheric Chemistry and Dynamics Branch, Greenbelt, 20771
AU: Kondo, Y
EM: kondo@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1, Komaba, Meguro, 153-8904 Japan
AU: Sinyakov, V P
EM: sinyakov@ktnet.kg
AF: Kyrgyz National University, 547, Frunze St., Bishkek, 720033 Kyrgyzstan
AU: Goutail, F
EM: florence.goutail@aerov.jussieu.fr
AF: CNRS, BP 3, Verrieres le Buisson, 91371 France
AB: The Global Ozone Monitoring Experiment (GOME) onboard the European Remote Sensing-2 satellite measured tropospheric nitrogen dioxide (NO$_{2}$) column amounts over East Asia from 1996 through 2002. We compare the GOME data with other independent tropospheric NO$_{2}$ column values at three locations: Moshiri in Japan, Issyk-Kul in Kyrgyzstan, and Zhigansk in Russia. For these locations, stratospheric NO$_{2}$ amounts obtained by satellite-borne solar occultation sensors (SAGE II and HALOE) are subtracted from the total (tropospheric + stratospheric) values obtained by ground-based UV$/$visible spectrometers, yielding estimates of the tropospheric NO$_{2}$ columns at sunrise$/$sunset. The tropospheric NO$_{2}$ column estimates are then corrected for the local time to coincide with the GOME measurements using outputs from a tropospheric chemistry global model. The mean difference between the corrected NO$_{2}$ column estimates and the GOME data is as small as 0.6$\times$10$^{14}$ cm$^{-2}$, with a 1$\sigma$ standard deviation of 6.0$\times$10$^{14}$ cm$^{-2}$. In East Asia, the most significant (exceeding a 3$\sigma$ variation) increasing trends of tropospheric NO$_{2}$ are found only at some locations in eastern China during wintertime. The mean linear trend of the wintertime values in eastern China is estimated to be about 13$\times$10$^{14}$ cm$^{-2}$ year$^{-1}$ (about 8.4% year$^{-1}$) over 1996-2002.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting