四川省气溶胶光学厚度时空分布特征

Spatial and Temporal Distribution Characteristic of Aerosol Optical Depth in Sichuan

本文利用MODIS气溶胶光学厚度产品,建立了气溶胶光学厚度与PM10/2.5的线性关系。分析了2008年～2012年四川省的气溶胶光学厚度时空分布特征,以成都市为特例分析了2003年～2012年的气溶胶光学厚度时空分布。结果显示：气溶胶光学厚度与PM10/2.5的线性关系较高；川西高原具有较低的气溶胶光学厚度,康定、马尔康、西昌、雅安等地年均气溶胶光学厚度约0.2；四川盆地区域具有较高的气溶胶光学厚度,以成都、德阳等地为代表,年均值在0.8～1.0之间,并具有明显季节变化特征；成都市的气溶胶光学厚度时空分布具有明显的城市特点。这些时空分布的特征与四川省的工业情况、地理位置、气候条件有关。

Using MODIS aerosol optical depth（AOD） product,this study established a linear relationship between the AOD and PM10 /2.5.The spatial and temporal characteristics of aerosol optical depth in Sichuan from 2008 to 2012 are analyzed,taking the 10 years（2003 ～ 2012） data of Chengdu as a special case.The result showed that the linear correlation between AOD and PM10 /2.5 was relatively high.The AOD in west Sichuan plateau was relatively low.The annual AOD-average in the regions such as Kangding,Maerkang,Xichang and Yaan was about 0.2.The Sichuan Basin such as Chengdu,Deyang has relatively higher annual AOD-average which was about 0.8 to 1.0,and it had obvious seasonal change feature.The spatial and temporal distribution of aerosol optical depth in Chendu showed obvious urban characteristics.These characteristics are related to the industrial situation,the location and the climate condition of Sichuan.