基于MODIS资料内蒙古气溶胶光学厚度反演分析

文章利用国家卫星气象中心引进的以暗像元特性为基础的气溶胶光学厚度反演软件,对内蒙古地区2009年12月至2010年12月的EOS/MODIS气象卫星资料进行反演,计算0.55μm气溶胶光学厚度,并提取119个气象台站气溶胶光学厚度值按盟市进行月平均、年平均值统计分析,寻找气溶胶光学厚度的空间分布特征和时间变化规律。结果表明:(1)内蒙古地区气溶胶光学厚度存在非常明显的空间分布特征,最高值区主要集中在中部和西部地区,东部的大部地区基本没有最高值出现。(2)内蒙古地区气溶胶光学厚度存在明显的时间变化规律。从1月份逐渐增加,到6月和7月份达到全年最大值,再逐渐降低趋势;春季和夏季最大,而秋季和冬季最小,夏季>春季>秋季>冬季。

An Inversion study of Aerosol Optical Thickness Based on MODIS Data in Inner Mongolia

By using the aerosol optical thickness inversion software based on dark pixel characteristics which introduced by National Satellite Meteorological Center, the EOS / MODIS meteorological satellite data from Decem-ber 2009 to December 2010 of Inner Mongolia region were analyzed to calculate the 0.55μm aerosol optical thickness. The aerosol optical thickness values of 119 meteorological stations were analyzed, according to the monthly and annual average data analysis, to find space distribution and time variation of aerosol optical thick-ness. The results showed that：（1） Inner Mongolia area’s aerosol optical depth has obvious characteristics of the spatial distribution. The highest value areas are mainly concentrated in the central and western regions, barely in most of the eastern.（2）The time variation of aerosol optical depth is very obvious. The value gradually increase from January, and in June or July reached its maximum value, and then gradually decreased; the spring and sum-mer have the highest value, and the autumn and winter have the minimum value; the seasonal value trends that summer ＆gt; spring ＆gt; autumn ＆gt; winter.