关键词: 激光雷达,气溶胶,极区平流层云,臭氧洞,后向散射比,积分后向散射系数

Abstract:

A Lidar system (694nm) was used to measure the stratospheric aerosol at Zhongshan Station(69°22′S, 76°22′E) in 1993. The Lidar data presented in this paper were obtained between March 27 and November 5,1993. A total of 53 times of Lidar observations was made over the 9 month period.In this paper we present Lidar observations of the vertical profiles of the stratospheric aerosol backscattering ratio and the integrated backscatter coefficients over the 12-30km altitude range. The observations show that the stratospheric aerosol particulate matter noticeably enhanced in 1993 than that in 1990 due to Mt. Pinatubo eruption in Philippines in June 1991. We presented the seasonal variation of the integrated backscatter coefficient(IBC). The mean value for each observation period is plotted in Fig.2. The noticeable maximum of IBC is easily found in winter season from curve in Fig 2. Maximum value of IBC is 3.4×10 -3 (sr -1 ). Polar Stratospheric Clouds(PSCs) are observed from late May until September.The vertical profiles of the stratospheric aerosol backscattering ratio in Antarctica show a clear double layer structure, one layer is at a altitude of about 12km, another is at a altitude of about 25km. In this paper we analyze the vertical structure of backscattering ratio.