Observations of Polar Aerosols at Alaksa and Spitsbergen : Its influence on the global environmental change

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The main purpose of this project is the research of the polar stratospheric clouds over Arctic region. We have obtained the following results by the research of the two years : 1) The vertical profiles of PSCs over spitsbergen were observed in the two winter seasons on 1995/1996 and 1996/1997.2) The vertical profiles of ozone over Fairbanks, Alaska were observed in the same winter seasons. 3) The aerosol profiles over Fairbanks were observed by lidar in two years between April 1995 and March 1997.4) The aerosols were directly sampled near the ground level in the same period of the observations of PSCs. The components of the aerosols were obtained by the Chemical analysis. The followings have been found by the results above : 5) The large size liquid PSC particles are often found in the Arctic PSCs. 6) Those PSCs are specially formed when the ambient temperature is dropped near the frost point of ice.It is reported that the stratospheric ozone was largely depleted over Arctic in the winter 1995/1996. The homogeneous reaction over the PSC particle are thought as the main process that causes the ozone loss. The liquid particles mentioned in 5) would playd major roll in the process. The lidar observed data will geve us precious data set to study the heterogeneous process.