海洋水色水温扫描仪精确大气漫射透射比计算  

Exact Computation of Atmospheric Diffuse Transmittance for Chinese Ocean Color and Temperature Scanner

作　　者：何贤强[1] 潘德炉[1] 白雁[2] 龚芳[2] 朱乾坤[2] 

机构地区：[1]卫星海洋环境动力学国家重点实验室,浙江杭州310012 [2]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《光学学报》2008年第4期626-633,共8页Acta Optica Sinica

基　　金：国家自然科学基金(40506036,40706061);国家863计划(2007AA12Z137,2008AA09Z104)资助课题

摘　　要：海洋水色水温扫描仪(COCTS)是中国海洋水色系列卫星上的主遥感器,主要用于探测我国及全球部分海域的海洋水色和水温环境信息。大气漫射透射比计算是COCTS大气校正的必需过程,直接影响COCTS大气校正和水色信息反演的精度。提出了基于加倍法解大气-海洋耦合矢量辐射传输方程的大气漫射透射比精确计算方法,通过与SeaWiFS精确大气漫射透射比查找表计算结果的比较,结果表明计算相对误差小于1.5%,而当观测天顶角小于60°时,计算相对误差小于0.5%,可以用来生成COCTS的精确大气漫射透射比查找表。在此基础上,生成了专门针对COCTS的精确大气漫射透射比查找表。Chinese ocean color and temperature scanner （COCTS） is the main sensor on the Chinese ocean color series satellites, which is used for real-time monitoring of the ocean color and sea-surface temperature of the sea areas around China and part of the global ocean. The calculation of atmospheric diffuse transmittance is required in the ocean color atmosphere correction which affects the accuracy of the atmosphere correction and ocean color information retrieving. An exact computation method of atmospheric diffuse transmittance is developed based on the vector radiative transfer equation （VRTE） which is solved by adding-doubling method. Comparison with the diffuse transmittance derived from SeaWiFS exact diffuse transmittance look-up table, proves that the relative error of this adding-doubling method is less than 1.5 %, and when the observing zenith angle is less than 60°, the relative error is even less than 0.5 %. Therefore, the adding-doubling method can be used to generate the exact atmospheric diffuse transmittance look-up table for the Chinese ocean color and temperature scanner （COCTS）. Finally, using the developed vector radiative transfer code with adding-doubling method, we generate exact atmospheric diffuse transmittance look-up tables for COCTS.

关 键 词：大气光学 大气漫射透射比 查找表 辐射传输 海洋水色水温扫描仪 

分 类 号：P422.3[天文地球—大气科学及气象学]