Determination of the optical thickness and effective particle radius of clouds from transmitted solar radiation measurements

查看全文 作　　者：Wang Yue Lu Daren Huo [1]Juan

机构地区：[1]Laboratory for Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

出　　处：《Progress in Natural Science:Materials International》索引2007年第17卷第10期,共9页

基　　金：Supported by National Natural Science Foundation of China (Grant Nos 40333034 and 40027002);the Ministry of Science and Technology of China (Grant No 2001CCA0200) 摘　　要：A method is presented for determining the optical thickness (τc) and effective particle radius (re) of stratiform cloud layers from transmitted solar radiation measurements. A detailed study shows that the cloud optical thickness and effective particle radius of water clouds can be determined from transmission function measurements at 0.75 and 2.13 μm, provided that the scaled optical thickness τ′0.75>1 and re>5 μm. The wavelengths adopted by our study are similar to the channels of the moderate resolution imaging spectrometer (MODIS). The proposed method is invalid for optically thin clouds since transmission at 2.13 μm is less sensitive to re. The retrieval errors of τ′0.75 and re monotonically decrease with increasing τc. For clouds having τ′0.75≥2, the retrieval errors of τ′0.75 and re are below 10% and 20%, respectively. Transmissions at 0.75 and 1.65 μm can also be used to retrieve τc and re. 关键词：太阳辐射测量法云光学厚度有效粒子半径

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Determination of the optical thickness and effective particle radius of clouds from transmitted solar radiation measurements

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