基于MODIS的中国陆地气溶胶光学厚度时空分布特征

Spatial and temporal distribution of aerosol optical depth in China based on MODIS

利用MODIS 08_C5气溶胶产品2000—2008年月均值资料,通过线性回归和相关分析方法,探讨中国大陆地区550 nm气溶胶光学厚度的时空分布特征和变化趋势。结果表明:南疆盆地、长江中下游地区以及四川盆地常年处于气溶胶光学厚度高值区;全国各地气溶胶光学厚度季节变化有明显差异,大部分地区年内呈先增大后减小趋势,4月达到其年内最高值,且多年光学厚度月均值与全国每月发生沙尘总次数呈显著相关关系;沙尘月发生10次以上地区,沙尘月发生次数与光学厚度月均值之间呈显著线性相关关系,而沙尘月发生10次以下地区,沙尘月发生次数与光学厚度月均值之间没有明显的关系。

Characteristics of spatial and temporal distribution and variation trends of aerosol optical depth（AOD,on 550 nm） in China were analyzed by linear regression and correlation analysis in this paper with monthly mean data by the NASA MODIS08_C5 product from 2000 to 2008.The results indicate that the all-year high value of AOD occurred in the southern Sinkiang basin,the Yangtze river region and the Sichuan basin.There are significant differences in seasonal variation of AOD,but the trend was increased first and then decreased in most areas during the year.AOD reaches its maximum value in April.The monthly average of AOD and the sum occurrence times of sand-dust had an obvious relationship.The monthly occurrence frequency of dust and the monthly mean AOD showed a significant linear correlation where the dust occurred more than 10 times,otherwise there was no obvious relations between them.