Based on the daily aerosol optical depth and cloud effective radius from MODIS and the daily precipitaiton from TRMM dur-ing 2008-2012,the monthly variation of aerosol optical depth (AOD)was analyzed over North China and its adjacent sea area,and the relationships between AOD and cloud effective radius under different rainfall condition in summer were researched.The results showed that the seasonal changes of AOD were obvious over North China and its adjacent sea area,the maximum and minimum AOD appeared in summer and winter over the land,while they occurred in spring and autumn over the ocean,respectively.And the monthly AOD over the ocean was less than that over the land during 2008-2012.The relation between AOD and cloud effective radius in sum-mer over North China and its adjacent sea area was significantly different.For water cloud,their correlation was significantly positive o-ver the land in summer,AOD could promote the increase of water cloud effective radius,while it was significantly negative over the o-cean,and the correlation all enhanced with precipitation increase.As for ice cloud,AOD was negative related with cloud effective ra-dius for small rain but postive for moderate rain and heavy rain in summer over the land,however the relation presented an obvious neg-ative over the ocean,and the correlation decreased with precipatation increase.%利用2008—2012年MODIS和TRMM卫星遥感数据产品逐日资料,分析华北地区及临近海域气溶胶光学厚度的月变化,以及夏季不同降雨量下气溶胶光学厚度与云滴有效半径的关系.结果表明:华北地区及邻近海域气溶胶光学厚度呈明显的季节性变化,陆地上夏季最大、冬季最小,海洋上春季最大、秋季最小;海洋上的气溶胶光学厚度小于陆地.陆地上,夏季气溶胶光学厚度与水云云滴有效半径呈显著正相关,在海洋上二者呈显著负相关,且相关性随降雨量的增加均增大.陆地上,夏季气溶胶光学厚度与冰云云滴有效粒子半径在小雨下呈显著负相关,在中雨和大雨下呈正相关;海洋上,气溶胶光学厚度和冰云有效粒子半径呈显著负相关,且相关性随降雨量的增加而减小.
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