中国东部海域气溶胶光学厚度时空变化研究

Research on Temporal-spatial Variation of Aerosol Optical Depth over the Eastern China Seas

结合船基海上现场实测资料与卫星遥感MODIS光学厚度资料,分析了中国东部海域气溶胶光学厚度(AOD)的季节变化和地理分布特征。中国东部海域平均气溶胶光学厚度存在以中纬度为中心的纬向分布;同时受到陆源物质的影响,近海气溶胶光学厚度大于远海,且随着离海岸距离变大有线性递减的趋势。受沙尘、季风气候的影响,各海域气溶胶光学厚度存在明显季节变化和分布特征。渤海、黄海及东海有类似的变化特征,春季都受到沙尘气溶胶的影响,气溶胶平均光学厚度值为全年最高0.12,并且对东海的影响最明显;夏季最小,秋、冬季逐渐变大。

The MODIS-derived products of Aerosol Optical Depth(AOD) were also validated with the in-situ observations.The spatial distribution and temporal variation of the AOD over the Eastern China Seas were analyzed.The temporal-mean AOD had high-value at the mid-latitude over Eastern China Seas.Due to the influences of the terrestrial material in the atmosphere,inshore aerosols optical depth was greater than offshore one.And the AOD had a linear decrease trend with the increase of distance to the coast.Due to the influence of dust and monsoon,temporal and spatial distributions of the AOD were present in the Eastern China Seas.In spring,the influence of dust made AOD reaching maximum of 0.12 in the year over the whole East China Seas,especially over the Donghai Sea.The AOD value began to decrease during summer and autumn,and then increased slowly in winter season.