单通道物理法反演海表温度的参数敏感性分析及验证  

Sensitivity analysis and validation of the single channel physical method for retrieving sea surface temperature

作　　者：周旋[1,2] 杨晓峰[1] 程亮[2] 李紫薇[1] 

机构地区：[1]中国科学院遥感应用研究所 [2]中国人民解放军61741部队

出　　处：《红外与毫米波学报》2012年第1期91-96,共6页Journal of Infrared and Millimeter Waves

基　　金：国家863资助项目(2006AA09Z137);中科院重大科研装备研制项目(YZ200946);国家海洋局"渤海环境立体监测与动态评价专项"(08Q0090034)~~

摘　　要：定量分析了反演海表温度的单通道物理法对海水比辐射率、海面风速、海水盐度、大气透过率、大气上下行辐射等参数的敏感性,发现海水比辐射率、大气透过率对算法精度影响较大,是单通道物理法反演海表温度的主要误差来源.在不同的波段,单通道物理法对参数敏感性也有较大差别,中红外波段的敏感性要小于热红外波段.为了验证单通道物理法的可行性、精度及参数敏感性分析的结果,选择墨西哥湾海域2009年全年夜间MODIS实测数据进行实验.结果表明,中红外波段的单通道物理法反演海表温度的精度高于热红外波段,达到MODIS劈窗算法海表温度标准产品同等精度,这与参数敏感性分析的结果一致.由于中红外波段单通道物理法精度较高,一方面,可以满足常规的业务观测需求,为海表温度反演提供新的技术手段;另一方面,可用来标定劈窗算法系数,弥补海洋现场观测站位空间分布不足的问题.After analyzing quantitatively the sensitivity of sea surface emissivity,sea surface wind,sea water salinity,atmospheric transmittance,and atmospheric upwellward/downward radiation on the sea surface temperature（SST） retrieval from a single channel physical-based SST algorithm,it was concluded that that sea surface emissivity and atmospheric transmittance have greater impact on the accuracy of SST retrieval than the others.Deriving SST with different single infrared channel（3.7 μm）,we found that the mid-infrared single channel physical-based SST algorithm is less sensitive to the accuracy requirements of these input parameters than that based in thermal band（11 μm and 12 μm）.The night-time MODIS data taken in the Gulf of Mexico around the year of 2009 was used to validate the feasibility and accuracy of this algorithm and the sensitivity analysis.The result shows that the single physical channel method based on mid-infrared band is the optimal choice in case only one infrared channel is available on the space instrument.Furthermore,the algorithm at mid-infrared band can help to derive the operational coefficients for traditional split-window algorithm.

关 键 词：单通道物理法 大气温湿廓线 海表温度 敏感性分析 

分 类 号：P731.11[天文地球—海洋科学]