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B-8.1 Analysis of Regional Characteristics and Source of Seasonal Variation of Tropospheric Ozone Distribution

[Contact Person]

Gen Inoue
Director
Center for Global Environmental Reserch
National Institute for Environmental Study
Environment Agency
Onogawa 16-2, Tsukuba. Ibaraki, 305-0053 Japan
Phone; +81-298-50-2402. Fax; +81-298-58-2645
E-mail; inouegen@nies.go.jp

Total Budget of FY1996-FY1998

24,408,000 Yen (FY1998; 8,066,000 Yen)

Abstract

Variation of surface ozone concentration in East Asia is characterized by long-range transport of air mass, which can be broadly categorized into "clean continental," "regionally polluted continental" and "marine." Surface ozone concentration in the "clean continental" and "regionally polluted continental" air mass shows seasonal maximum in spring and summer, respectively. These features are analogous to those in Europe, while concentration range in Northeast Asia is about 10 ppbv higher than in Europe. About 20 ppbv of ozone is photochemically formed in the regionally polluted air mass before reaching to Japan. Surface ozone in continental Southeast Asia is characterized by "wet" and "dry" season. In wet season ozone concentration is very low due to marine air mass from Indian Ocean, while in dry season ozone level can be very high due to regional scale biomass burning.

[Key Words]

Tropospheric ozone, Surface ozone, East Asia, Regionally polluted continental air mass, Biomass burning