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WANG Jin,ZHANG Jie,WANG Jing. 2017. Sea surface wind speed retrieval under rain with the HY-2 microwave radiometer. Acta Oceanologica Sinica, 36(7):32－38

Sea surface wind speed retrieval under rain with the HY-2 microwave radiometer

HY-2微波辐射计降雨条件下海面风速反演算法研究

Received:March 30, 2016 Revised:September 05, 2016

DOI：10.1007/s13131-017-1080-5

Key words:HY-2 microwave radiometer rain wind speed retrieval algorithm brightness temperature

中文关键词: HY-2微波辐射计降雨风速反演算法亮温

基金项目:The National Science Foundation for Young Scientists of China under contract 41306183; the National High Technology Research and Development Program (863 Program) of China under contract Nos 2013AA09A505 and 2013AA122803.

Author Name	Affiliation	E-mail
WANG Jin	College of Physics, Qingdao University, Qingdao 266071, China	wangjin@qdu.edu.cn
ZHANG Jie	The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
WANG Jing	College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China

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Abstract:

As rain drops change the radiation and scattering characteristic of the oceans and the atmosphere, the wind speed measuring by spaceborne remote sensors under rainy conditions remains challenging for years. On the basis of a microwave radiometer (RM) loaded on HY-2 satellite, the sensitivity of some brightness temperature (TB) channels to a rain rate and the wind speed are analyzed. Consequently, two TB combinations which show minor sensitivity to rain are obtained. Meanwhile, the sensitivity of the TB combination to the wind speed is even better to the original TB channel. On the basis of these TB combinations, a wind speed retrieval algorithm is developed and compared with WindSat all-weather wind speed product, HY-2 RM original wind speed product and buoy in situ data. The wind speed retrieval accuracy is better than 2 m/s for rainy conditions, which is evidently superior to HY-2 RM original product. The applicability of this new algorithm is testified for the wind speed measuring in rainy weather with HY-2 RM.

中文摘要:

由于降雨改变了海洋-大气的辐射/散射特性，长期以来星载遥感器在降雨条件下进行海面风速信息提取存在困难。本文针对自主海洋动力环境卫星海洋2号（HY-2）搭载的扫描微波辐射计，分析了不同频段亮温对降雨和海面风速敏感性，自此基础上获得了一种对降雨不敏感的亮温通道组合，该亮温通道组合对海面风速的敏感性甚至高于原有亮温通道。本文利用该亮温通道组合建立了降雨条件下的风速反演算法，并将反演结果与WindSat全天候风速产品、HY-2微波辐射计原有风速产品以及浮标实测数据进行了比较。结果表明本文算法在降雨条件下的反演误差小于2m/s，明显优于原有HY-2微波辐射计风速产品，验证了本文发展的算法在降雨条件下的风速反演能力。

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