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外定标中海面参数对发射率影响研究
引用本文:黄骁麒,李铜基.外定标中海面参数对发射率影响研究[J].海洋技术,2008,27(2):67-71.
作者姓名:黄骁麒  李铜基
作者单位:国家海洋技术中心,天津,300112
摘    要:星载微波辐射计外定标的关键问题是通过辐射传输方程计算天线入瞳处亮温。根据辐射传输方程,海面成份对亮温的影响包括海面的微波辐射和对下行大气辐射的反射,其中的关键参数分别为海面发射率ep和海表面反射率R。文中对平静海面Fresnel反射率模式和粗糙海面反射率模式进行了研究分析,在此基础上着重研究了海面温度TS、海面盐度SS、海面风速W、以及观测角度θ等物理参数对海面发射率ep的影响,进而分析了这些物理参数的测量误差对亮温的计算精度的影响。

关 键 词:外定标  辐射传输方程  亮温  海面反射率
文章编号:1003-2029(2008)02-0067-05
修稿时间:2008年1月25日

Study on Impact of Sea Surface Parameters on Emissivity in External Calibration
HUANG Xiao-qi,LI Tong-ji.Study on Impact of Sea Surface Parameters on Emissivity in External Calibration[J].Ocean Technology,2008,27(2):67-71.
Authors:HUANG Xiao-qi  LI Tong-ji
Abstract:The key issue in external calibration of microwave radiometer on board satellite is the determination of brightness temperature on the pupil of antenna by using radiative transfer equation.According to radiative transfer equation,the elements of sea surface which exert impact on the brightness temperature include primarily the microwave radiation from sea surface and the reflection of downwelling atmospheric radiation,the key parameters among them are emissivity and reflectivity of sea surface.This paper analyzes the reflectivity of both calm sea and rough sea surface.Based on the analysis,the paper focuses on studying the impact of physical parameters,such as sea surface temperature,sea surface salinity,sea surface wind speed and angle of observation,on surface emissivity.Further analysis is made on the impact of the errors of these physical parameter measurements on the accuracy of brightness temperature calculation.
Keywords:external calibration  radiative transfer equation  brightness temperature  reflectivity of sea surface
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