Analysis of cost functions for retrieving sea surface salinity

doi:10.1007/s11802-012-1872-3

IOCAS-IR > 海洋环流与波动重点实验室

	Analysis of cost functions for retrieving sea surface salinity
	Qi Zhen 1,2; Wei Enbo 1; Wei, EB (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
	2012-06-01
发表期刊	JOURNAL OF OCEAN UNIVERSITY OF CHINA
ISSN	1672-5182
卷号	11 期号:2 页码:147-152
文章类型	Article
摘要	Two kinds of Bayesian-based cost functions (i.e., the unconstrained cost function and parameter-constrained cost function) are investigated for retrieving the sea surface salinity (SSS). In low SSS regions, we have analyzed the sensitivity of the two cost functions to geophysical parameters. The results show that the unconstrained cost function is valid for retrieving several parameters (including SSS, wind speed and significant wave height), and the constrained cost function, which largely depends on the accuracy of reference values, may lead to large retrieval biases. Furthermore, as a retrieval parameter, the sea surface temperature (SST) can result in the divergence of other geophysical parameters in an unconstrained cost function due to the strong sensitivity of brightness temperature to SST. By using the unconstrained cost function and the simulated brightness temperature T (B) with white noises, the retrieval biases of SSS are discussed with the following two procedures. Procedure a): the simulated T (B) values are first averaged, and then SSS is retrieved. Procedure b): the SSS is directly retrieved from the simulated T (B), and then the retrieved SSS values are averaged. The results indicate that, for low SSS and SST distributions, the SSS retrieval by procedure a) has less biases compared with that by procedure b), while the two procedures give almost the same retrieval results for high SSS and SST sea regions.
关键词	Cost Function Sea Surface Salinity And Temperature Brightness Temperature
学科领域	Oceanography
DOI	10.1007/s11802-012-1872-3
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000303526400005
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/12131
专题	海洋环流与波动重点实验室
通讯作者	Wei, EB (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Inst Oceanol, Beijing 100039, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Qi Zhen,Wei Enbo,Wei, EB . Analysis of cost functions for retrieving sea surface salinity[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2012,11(2):147-152.
APA	Qi Zhen,Wei Enbo,&Wei, EB .(2012).Analysis of cost functions for retrieving sea surface salinity.JOURNAL OF OCEAN UNIVERSITY OF CHINA,11(2),147-152.
MLA	Qi Zhen,et al."Analysis of cost functions for retrieving sea surface salinity".JOURNAL OF OCEAN UNIVERSITY OF CHINA 11.2(2012):147-152.

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