• 关键词：MODIS  气溶胶光学厚度  长江三角洲

• 基金项目：国家自然科学基金项目(No40475003)

• 段婧
• 北京大学物理学院大气科学系, 北京100871

• 毛节泰
• 北京大学物理学院大气科学系, 北京100871

• 摘要：利用2000～2005年MODISLevel2气溶胶产品分析了长江三角洲区域气溶胶光学厚度的分布和季节变化特点.结果显示,近年来长江三角洲气溶胶光学厚度值较高的区域逐年增加,光学厚度大于1.0的区域面积增加最快.根据城市气溶胶季节变化特征研究,发现长江三角洲地区各主要城市近年气溶胶有逐渐增加的趋势.统计结果表明,平原城市群气溶胶年峰值出现在夏季;山区城市群气溶胶年峰值出现在春季.平原城市群光学厚度增加速度大于山区城市群.

• Abstract：Characteristics of distribution and seasonal variation trends of aerosol optical depth (AOD, on 550nm) over the Yangtze River Delta (YRD) were analyzed in this paper with the NASA MODIS Level-2 products from 2000 to 2005. The results indicate that the areas of regions with larger than 1.0 increased most quickly. The AODover main big cities in the YRDincreased gradually year by year according to the variation characteristics of AODpeak values in the whole year over the cities in plain regions appear in summer but those over the cities in mountainous areas appear in spring. The yearly increasing trend of AODover the plain cities is larger than those over the mountainous area cities.

• Key words：MODIS  aerosol optical depth  Yangtze River Delta

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