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《Acta Scientiarum Naturalium Universitatis Pekinensis》 2010-02
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Spatial Distributions and Changes of Aerosol Optical Depth over Eastern and Central China

GUAN Jiaxin,LI Chengcai Department of Atmospheric Sciences,School of Physics,Peking University,Beijing 100871;  
Seasonal changes of aerosol optical depth over the Central and Eastern China,the Sichuan Basin,the Yangtze River Delta and the Pearl River Delta from MODIS data from March 2000 to February 2009 are analyzed and compared.It is found that in the 9 years the mean AOD over every region in all seasons has significant increasing trends,except for Sichuan Basin in autumn.The highest AOD occurs over the Yangtze River Delta in both annual and seasonal averages,and the increasing rate of annual mean is up to 1.82% per year.The AOD over Sichuan basin ranks second,and then is North China,the Pearl River Delta has the lowest annual average AOD.The fastest increase of AOD is in summer,the difference between spring and summer becomes smaller,and some areas,such as North China,AOD in summer is higher than that in spring.AOD data are the least and their growth rate are the lowest in winter.Thus,the gap between winter and other seasons becomes larger.The AOD over some regions in some seasons,such as over the North China in summer and autumn,the Sichuan Basin in spring,summer and autumn,and the Pear River Delta in autumn,over the period of 2006 to 2008 have continuous decreasing trends.These results will benefit the studies of regional climate change and air pollution variation.
【Fund】: 国家自然科学基金(40575001 40775002);; 国家高技术研究发展计划专项经费(2006AA06A303)资助
【CateGory Index】: X87
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