利用MODIS卫星产品分析西南地区云水特征

Characteristic Analysis of Cloud Water in Southwest China Using MODIS Data

采用NASA Goddard Earth Science DAAC发布的2001—2010年MODIS水云云水含量和水云粒子有效半径资料,选取西南地区(四川、重庆、云南、贵州),分析了水云云水含量和水云粒子有效半径的多年平均空间分布特征,对年和季节平均水云云水含量和粒子有效半径进行了线性趋势分析,并进行了显著性检验。结果表明:西南地区年和季节多年平均云水含量在海拔高的地方偏少,在海拔低的地方偏多;年和季节多年平均粒子有效半径的空间分布特征与云水含量相反。云水含量具有季节差异性,秋季和夏季是云水含量最丰富的季节,春季和冬季较少;粒子有效半径的季节差异较小。10年中云水含量呈减少趋势,春季和冬季云水含量减少趋势明显;而粒子有效半径无显著变化趋势。

The multi-year spatial distribution and variations of liquid water content and particle effective radiuses in Southwest China are analyzed by using MODIS data from NASA Goddard Earth Science DAAC from 2000 to 2010.The results show that annual and seasonal liquid water content at high latitudes is greater than that at low latitudes;the annual and seasonal particle effective radiuses have the opposite distributions.Liquid water content has seasonal difference,higher in autumn and summer,and lower in spring and winter;particle effective radiuses have smaller seasonal difference.There is a decreasing trend in annual liquid water content from 2000 to 2010,as well as in spring and winter,and there is no obvious trend in particle effective radius.