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A-1.2.2 Studies on the movement of the stratospheric aerosols by laser radar observations in Hokkaido, Japan.

[Contact Person]

Toshikazu Itabe
Director
Photonic Technology Division
Communications Research Laboratory
Ministry of Posts and Telecommunications
Nukui-kita 4-2-1, Koganei, Tokyo 184-8795, Japan
Phone +81-42-327-7546, Fax +81-42-327-6667
E-mail itabe@crl.go.jp

Total Budget for FY1996-1998

14,340,000 Yen (FY1998; \4,989,000Yen)

Abstract

The stratospheric aerosols, which affect the ozone chemistry through the heterogeneous reaction, were observed by the lidar at Wakkanai, Hokkaido, and at Kushiro,Hokkaido during winter. The amount of the stratospheric aerosols ejected by Mt.Pinatubo eruption was decreasing until 1996 and seems to become stable after 1997. Wavelength exponent of backscattering coefficient at 532nm and 1064nm became larger with time; particles with a radius smaller than 0.1μm seem to have become more predominant. The lidar system used at Kushiro was moved to Rikubetsu in November 1997 since observations from here were possible during the summer, and the system was improved to permit automatic observations.

[Key Words]

lidar, stratospheric aerosols, backscattering coefficient