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[Ａ−３.５　Analytical Study of Ground-base and Satellite-base Measurements of Polar Stratospheric Aerosols]


[Contact person]

      Kohei Mizutani
      Chief
      Optical Remote Sensing Section, Global Environment Division
      Communications Research Laboratory
      Nukui-Kitamachi 4-2-1, Koganei, Tokyo 184-8795, Japan
      Tel: +81-42-327-6955 Fax: +81-42-327-6667
      E-mail: mizutani@crl.go.jp


[Total Budget for FY1999-2000]

　16,355,000 Yen
　(FY 2000; 8,245,000 Yen)

［Abstract］

　It is shown from lidar observation at Hokkaido that the recent stratospheric aerosol load is nearly background level after 1998. Appearances of liquid PSC layers at Eureka in January 1996 were well simulated by Carslaw's chemical thermodynamic model of ternary solution aerosols. The newest retrieval (version 5.20) of the Improved Limb Atmospheric Spectrometer (ILAS) on board the Advanced Earth Observing Satellite (ADEOS) captured more than 60 polar stratospheric cloud (PSC) profiles (with about 200 events) during the winter and early spring of 1997 in the Northern Hemisphere. Comparisons with the theoretically predicted values revealed that the ILAS observed typical type 1b PSCs on January 19th and 20th. Most of the PSCs observed late in the PSC season had features of type 1a PSCs. Polar stratospheric aerosols observed over Dome F in 1997 were investigated and classified from size distribution and back-scattering properties of aerosols. Altitude in which each pattern of PSCs appeared are limited, and they seem to have deep relation of amount of pre-existing particles.


［Key Words］

　stratospheric aerosols, PSCs, ILAS, optical properties, lidar