Retrieval of cirrus cloud top height over ocean based on multi-angle polarized information
Received:November 03, 2017  Revised:February 08, 2018  download
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Author NameAffiliationE-mail
LI Shu Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences lishu_owen@sina.com 
SUN Xiao-Bing Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences xbsun@aiofm.ac.cn 
TI Ru-Fang Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences  
HUANG Hong-Lian Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences  
CHEN Zhen-Ting Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences  
QIAO Yan-Li Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences  
Abstract:Cloud top height could be retrieved by polarized information. In order to reduce the uncertainty of retrieval results caused by the variability of cloud and surface polarized properties, the multi-angle polarized information of 490 nm band and 865 nm band w as used to retrieve cirrus cloud top height.Atmospheric top polarized information and the differences of atmospheric top polarized information betw een 490 nm band and 865 nm band w as theoretically analyzed, w hich show ed that it w as feasible to retrieve cirrus cloud top height using polarized reflectance difference betw een 490 nm band and 865 nm band. Cirrus cloud w as assumed as General Habit M ixture ( GHM) model, the polarized reflectance difference w as evaluated by the vector radiative transfer model based on adding-doubling method, and the sensitivity of polarized reflectance to cirrus cloud effective radius, optical thickness and cloud top pressure w ere evaluated. The results show that w hen the cirrus cloud optical thickness is greater than 3, the polarized reflectance difference is not sensitive to the change of effective particle radius and optical thickness, and is sensitive to the change of cloud top pressure. The polarized reflectance difference look-up table w as constructed by choosing appropriate parameters according to sensitivity analysis, and retrieved cirrus cloud top heights using look-up table method base on POLDER3 data. The retrieval results w ere compared w ith POLDER3 product and M ODIS product. The results indicate that compared w ith the official POLDER3 algorithm, the polarized reflectance difference look-up table method could applied to a w ider scattering angle range, and had a better consistency w ith M ODIS product.
keywords:multi-angle,polarized information,cirrus cloud,cloud top height,retrieval
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Copyright:《Journal of Infrared And Millimeter Waves》