20世纪80年代中国地区大气气溶胶光学厚度的平均状况分析

ANALYSIS OF THE 1980′S ATMOSPHERIC AEROSOL OPTICAL DEPTH OVER CHINA

利用中国北京等 41个甲种日射站 1 979～ 1 990年太阳直接辐射日总量和日照时数等资料 ,配合同期 TOMS version - 7臭氧观测资料 ,反演了 41个站逐年、逐月 0 .75μm大气气溶胶的平均光学厚度值 (Aerosol Optical Depth,AOD) ,据此分析了 1 2 a来中国大气气溶胶的变化和时空平均分布特征。结果表明 :中国大气气溶胶光学厚度 AOD的多年平均分布是以四川盆地为中心向四周减少 ,南疆盆地和长江中游武汉附近为另两个大值中心 ;长江中下游大部分地区、山东半岛以及广东沿海等 ,AOD值亦较大 ;而东北大部、西北大部、云南和福建沿海等地 AOD较小。AOD各月平均分布有所不同。中国绝大部分地区春季 AOD值最大 ,最小值则各地不同。 1 979～ 1 990年 ,青藏高原、四川盆地西部、贵州北部、长江中下游大部分地区、山东半岛和南疆盆地西部等 ,AOD呈增长趋势。而东北地区、西北地区大部、云贵高原和广西西部以及华东沿海等地 AOD呈减小势态。中国地区 AOD的季节变化曲线大体可分为单峰、一峰一谷、两峰一谷和多峰等

With the daily direct solar radiation and sunshine duration data, as well as the TOMS version-7 ozone observation data of 41 solar stations in China for a period of 1979 to 1990,we retrieves the annual and monthly average 0.75 um aerosol optical depth, partly based on the method developed by Jinghuan Qiu.According to the rdsults above,the spatial and temporal distribution of aerosol optical depth in China was analyzed.The results show that Sichuan Basin is the center where aerosol optical depth is the highest. Wuhan and south Xinjiang Basin are the other two high value area. Most part of north east and north wesr,Yunnan as well as Fujian province are the lower value area of aerosol optical depth,The pattern of aerosol optical depth distribution for each month is different.The maximum occurs in spring for most areas of China ,but the minimum occurs in different season for different areas.During the years from 1979 to 1990,the aerosol optical depth had been increasing for areas of Qinzang plateau,west part of Sichuan Basin,north Guizhou province,most part of mid and lower reaches of Yangzi river,Shandong peninsula,and west part of south Xinjiang Basin.While the north east,most part of the north west ,Yunnan and Guizhou province,west Guangxi Province and north China ,the aerosol optical depth had been decreasing.