HR: 0830h
AN: A31D-0073    [PDF]
TI: Seasonal change of NMHCs (nonmethanehydrocarbons) and halocarbons from winter to spring in East Asia observed during the PEACE (Pacific Exploration of Asian Continental Emission) aircraft measurement campaigns
AU: * Shirai, T
EM: shirai@eorc.nasda.go.jp
AF: Earth Observation Research Center, National Space Development Agency of Japan, Harumi Island Triton Square Office Tower X 23F, 1-8-10 Harumi, Tokyo, 104-6023 Japan
AU: Blake, D R
AF: Department of Chemistry, University of California, Irvine, 573 Rowland Hall, University of California, Irvine, Irvine, CA 92697-2025 United States
AU: Blake, N J
AF: Department of Chemistry, University of California, Irvine, 573 Rowland Hall, University of California, Irvine, Irvine, CA 92697-2025 United States
AU: Meinardi, S
AF: Department of Chemistry, University of California, Irvine, 573 Rowland Hall, University of California, Irvine, Irvine, CA 92697-2025 United States
AU: Rowland, F
AF: Department of Chemistry, University of California, Irvine, 573 Rowland Hall, University of California, Irvine, Irvine, CA 92697-2025 United States
AU: Chan, J C
AF: Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 000 Hong Kong
AU: Takegawa, N
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-2 Komaba, Meguro-ku, Tokyo, 150-8904 Japan
AU: Kondo, Y
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-2 Komaba, Meguro-ku, Tokyo, 150-8904 Japan
AU: Koike, M
AF: Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8654 Japan
AU: Kita, K
AF: Department of Environmental Sciences, Ibaraki University, 2-1-1 Bunkyo, Mito-shi, Ibaraki, Ibaraki, 310-8512 Japan
AU: Kawakami, S
AF: Earth Observation Research Center, National Space Development Agency of Japan, Harumi Island Triton Square Office Tower X 23F, 1-8-10 Harumi, Tokyo, 104-6023 Japan
AU: Ogawa, T
AF: Earth Observation Research Center, National Space Development Agency of Japan, Harumi Island Triton Square Office Tower X 23F, 1-8-10 Harumi, Tokyo, 104-6023 Japan
AB: Recent population growth and rapid economic development in Asia has had a great impact on the amount and composition of gas emissions from Asia. To investigate the impact of these Asian emissions on local and regional air quality and climate, an airborne observation campaign PEACE (the Pacific Exploration of Asian Continental Emission) phases-A and B were conducted in January and April - May 2002, respectively. The concentrations of NMHCs (nonmethanehydrocarbons) and halocarbons were obtained by whole air sampling and subsequent gas chromatography analysis in the laboratory. Quantified onboard the aircraft were CO, CO2, O3, NO, NO2, NOy, H2O, SO2, aerosols, and condensation nuclei. The experiments were conducted along the East Asian coast, with PEACE-A and B representing the local winter and spring weather conditions, respectively. For most of the trace gases whose major atmospheric sink is OH oxidation, observed mixing ratios were much lower during PEACE-B compared to PEACE-A because of the more active photochemistry during spring-time. By contrast, some compounds showed higher mixing ratios in the upper troposphere for PEACE-B than PEACE-A, indicating more effective convection and transport of pollutants from the source regions during the spring-time. For compounds which have biogenic sources, the seasonal variation in the source strengths are indicated. The timescale of the transport in each season was estimated using the ratios of short-lived gases vs. more stable compounds. The results from PEACE are compared to those from the TRACE-P campaign (one of the NASA/GTE projects conducted from February to April 2001 in western Pacific). This comparison highlights the transition from winter to spring, as well as the range of annual trace gas variability in the region.
UR: http://atmchem.eorc.nasda.go.jp/GLACE/PEACE/htdocs/index.html
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
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: 2003 Fall Meeting