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C-1.2.1 International Cooperative Observations Using Aircrafts and Ships on the Balance of Materials Acidifying the Environment

[Contact Person]

Shiro Hatakeyama
Section Chief
Atmospheric Environment Division
National Institute for Environmental Studies
Environment Agency
16-2, Onogawa, Tsukuba, Ibaraki 305-0053, Japan
Phone +81-298-50-2502, Fax +81-298-50-2579
E-mail hatashir@nies.go.jp

Total Budget for FY1996-FY1998

3,601,000 Yen (FY1998; 24,586,000 Yen)

Abstract

International cooperative observations were agreed among Japan (NIES), Korea (NIER, KIST) and China (Peking Univ.). According to this agreement Aircraft observations and ground-based observations of atmospheric pollutants were performed over the East China Sea (FY1996: Jan. 6-25, 1997, FY1997: Dec. 2-19, 1997, and FY1998: Feb.2-6, 1999). In Jan. 1997 experiment, it was found that concentrations of SO₂ and trace acidic gases were high when northwest wind prevailed. In Dec., 1997 experiment, SO₂ Was generally low. It may have been caused by clouds over observation area. Very high concentrations of pollutants were observed in Feb. 2, 1999 flight. SO₂ higher than 10 ppb was observed. It seemed that the cyclone, which had moved from Taiwan to northeast of Japan along the Honshu Island, brought about such high concentration of pollutants. The observation supported the results of model simulation well.

[Key Words]

Cooperative observations, SO₂, NOy, Trace acidic gases, Northwest Pacific Ocean