Spatial and Seasonal Variations of Surface PM10 Concentration and MODIS Aerosol Optical Depth over China
Spatial and Seasonal Variations of Surface PM10 Concentration and MODIS Aerosol Optical Depth over China
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DOI：
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发表时间：
2009-02
影响因子：
2.3
通讯作者：
Chang-Keun Song;Chang‐Hoi Ho;R. Park;Yong-Sang Choi;Jhoon Kim;D. Gong;Yun-Bok Lee
中科院分区：
文献类型：
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作者：
Chang-Keun Song;Chang‐Hoi Ho;R. Park;Yong-Sang Choi;Jhoon Kim;D. Gong;Yun-Bok Lee
利用中分辨率成像光谱仪（MODIS）对2003-2005年中国大气气溶胶光学厚度（AOD）进行了卫星遥感反演，并与之进行了对比分析。PM10浓度和气溶胶光学厚度的年平均值表现出很强的空间相关性，表明气溶胶浓度的一致存在。然而，PM10浓度和AOD的月值之间的时间相关性表明其季节性的区域对比。东南沿海地区的相关系数为0.6或更高，而中北部地区的相关系数为-0.6或更低。这种区域差异很可能是由于气溶胶粒径分布的差异。这也支持的埃指数和细模分数从中分辨率成像光谱仪获得的分布数据。本文讨论了气溶胶中粗颗粒和细颗粒的特征。
We examine the spatial and temporal variabilities of ground-observed concentrations of particulate matter with diameters ≤ 10 ㎛ (PM10) over China and compare them with satellite-retrieved data on the aerosol optical depth (AOD) collected over the period 2003-2005 using a moderate resolution imaging spectroradiometer (MODIS). Annual mean values of the PM10 concentrations and AOD show a strong spatial correlation, indicating the consistent presence of aerosol concentrations. However, the temporal correlation between the monthly values of the PM10 concentrations and AOD indicates a regional contrast in their seasonality. The correlation coefficients are 0.6 or higher in the southeastern coast region, whereas they are -0.6 or lower in the north-central region. The regional discrepancy is most likely due to the difference in the size distributions of aerosols. This is also supported by the data on the distribution of the Angstrom exponent and fine mode fraction obtained from the MODIS. The characteristics of the aerosols with respect to coarse and fine particles are discussed in this study.