【摘要】 首先对1980年前后能见度资料非均一性进行了处理,得到中国地区1960～2005年能见度时间序列,并由此估算得到气溶胶光学厚度时间序列。对比已有观测及研究结果,本文获得的气溶胶光学厚度时间序列能够较好地反映出中国地区气溶胶光学厚度长期变化特征。中国地区气溶胶光学厚度呈现逐年增加的趋势,但1985年后增加趋势减缓,这种变化在大城市区域表现得更为明显。中国地区气溶胶光学厚度空间分布上呈现东南部高、西北部低的特征,东南部地区气溶胶光学厚度普遍大于0.4,最大值出现在四川盆地,气溶胶光学厚度超过0.8。更多还原

【Abstract】 After processing the visibility data inhomogeneity from inconsistent record formats before and after the year 1980,the authors obtain the long-term time series of visibility,from which the time series of atmospheric aerosol optical depth over China during 1960 to 2005 is derived.It shows well consistency with former observations and researches on long-term variation of aerosol optical depth over China.It is found that the aerosol optical depth over China showed an increasing trend but a slow upward trend after 1985,especially in the megacity regions.The aerosol optical depth is small in northwestern China and large in southeastern China where the aerosol optical depth is generally greater than 0.4,and the maximum of more than 0.8 is located in the Sichuan Basin.更多还原