Overview of surface ozone variability in East Asia-North Pacific region during IGAC/APARE (1994-1996)

Abstract： Surface ozone(O3) was measured at Oki Island(Japan), Cheju Island(South Korea), Lanyu Island (Taiwan Province, China), Cape D' Aguilar (Hong Kong SAR) and Lin'an, Longfenshan, Waliguan (China mainland) during January 1994-December 1996 as a component of IGAC/APARE(International Global Atmospheric Chemistry/East Asia-North Pacific Regional Experiment). This paper gave a joint discussion on the observational results at these stations over the study region. Investigations showed that the average of surface O3 mixing ratios at the seven sites are 47.9 ± 15.8, 48.1 ± 17.9, 30.2 + 16.4, 31.6 + 17.5, 36.3 ± 17.5, 34.8 ± 11.5 and 48.2 ± 9.5ppbv, respectively. Significant diurnal variations of surface O3 have been observed at Oki, Cheju, D' Aguilar, Lin'an and Longfenshan. Their annual averaged diurnal differences range from 8 to 23 ppbv and differ in each season.Surface O3 at Lanyu and Waliguan do not show strong diurnal variability. Seasonal cycles of surface O3 showed difference at the temperate and the subtropical remote sites. Oki has a summer minimum-spring maximum, while Lanyu has a summer minimum-autumn maximum. The suburban sites at D'Aguilar and Lin' an report high-level O3in autumn and Iow level O3 in summer. Surface O3 remainshigh in autumn and Iow in winter at the rural site Longfenshan. For the global background station Waliguan, surface O3 exhibits a broad spring-summer maximum and autumn-winter minimum. The backward air trajectories to these sites have shown different pathways of long-range transport of air pollution from East Asia Continent to North Pacific Ocean. Surface O3 was found to be strongly and positively correlated with CO at Oki and Lanyu, especially in spring and autumn, reflecting the substantial photochemical buildup of O3 on a regional scale. It is believed that the regional sources of pollution in East Asia have enhanced the average surface O3 concentrations in the background atmosphere of North Pacific. 作 者： K.S.Lam    T.J.Wang    T.Wangt    J.Tang    Y.Kajii    C.M.Liu    S.G.Shim   作者單位： K.S.Lam,T.Wangt(Environmental Engineering Unit, Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong)

T.J.Wang(Department of Atmospheric Science, Nanjing University, Nanjing 210093, China)

J.Tang(Chinese Academy of Meteorological Science, Beijing 100081, China)

Y.Kajii(Research Center for Advanced Science and Technology, University of Tokyo,Tokyo, Japan)

C.M.Liu(Department of Atmospheric Science, "National" Taiwan University, Taipei, Taiwan, China)

S.G.Shim(Global Environmental Research Center, Korea Institute of Science and Technology, Seoul, South Korea) 

期 刊： 環(huán)境科學學報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(4)  分類號： X131.1  Keywords： surface ozone    trajectory    transport    photochemistry   

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