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《Climatic and Environmental Research》 2012-01
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Aerosol Optical Depth Observed by Chinese Sun Hazemeter Network and Comparison with MODIS Products in Three Typical Cities in China

WANG Xiaoyuan,XIN Jinyuan,WANG Lili,and WANG Yuesi State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics,Chinese Academy of Science,Beijing 100029  
The CSHNET(Chinese Sun Hazemeter Network) data and MODIS(Moderate Resolution Imaging Spectroradiometer) aerosol products are used to analyze the aerosol optical characteristics in three typical Chinese cities:Beijing,Lanzhou,and Shanghai.The results showed that the annual mean AOD(Aerosol Optical Depth) were 0.41±0.35,0.55±0.21,0.55±0.21 in Beijing,Lanzhou,and Shanghai,respectively.The seasonal mean AOD generally exhibited a maximum in summer and aminimum in winter in Beijing but in the opposite trend in Lanzhou and no distinct seasonal cycles in Shanghai.Angstrm index(α) which conveys aerosol size distributions characteristics were 1.40±0.85,0.95±0.20,1.03±0.25 in Beijing,Lanzhou,and Shanghai,respectively,suggesting fine mode particles in Beijing and coarse mode particles in Lanzhou.MODIS AOD reveal satisfactory validations against surface measurements with correlation coefficients 0.91 in Beijng and 0.75 in Shanghai while poor validation is found in Lanzhou with correlation coefficients 0.07.Overestimations of MODIS AOD are noted in Beijing and Shanghai with annual mean 0.52±0.39 and 0.74±0.30 comparing to the underestimation in Lanzhou with annual mean 0.43±0.21.Considering the uncertainty of reflectance result from geographical positions and complicated coverage of urban area,the results are not well enough and the MODIS aerosol products shall be improved in future studies.
【Fund】: 中国科学院知识创新工程重大项目KZCX1-YW-06;; 国家高技术研究发展计划项目2006AA06A301;; 北京市科技计划公益应用项目D09040903670902
【CateGory Index】: P427.1;X513
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