近14年来中国大陆气溶胶光学厚度的时空演变特征

Spatio-temporal Variation Trends of Atmospheric Aerosol Optical Depth over Whole Chinese Mainland in the Last 14 Years

本文利用2001-2014年的MODIS产品分析了中国大陆地区气溶胶的时空演变特征。结果表明：就全国地区来说，其空间分布呈现高低值错落分布的特征；其时间变化表明，AOD大部分地区呈减弱趋势。季节性年平均AOD值的空间分布中极大值区域占全国地区的面积比，夏季最大；极小值区域的面积比，秋季最大。就3个典型区域来看，四川盆地是年平均AOD值最高的区域。

Using the MODIS products from 2001 to 2014, this paper analyzed the temporal and spatial characteristicsof aerosol in China's Mainland. The results showed that the spatial distribution of AOD in the whole country was char-acterized by high and lowvalue distribution, and the temporal variation showed that AOD tended to weaken in mostareas. In the spatial distribution of seasonal annual average AOD, the area ratio of the maximum area to the nationalarea was the largest in summer, and that of the minimum area was the largest in autumn. For the 3 typical regions, theSichuan basin was the highest area with an average annual AOD value.