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Analysis of cost functions for retrieving sea surface salinity

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Journal of Ocean University of China : Volume 11, Issue 1, March 2012

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Analysis of cost functions for retrieving sea surface salinity

Content Provider	Springer Nature Link
Author	Qi, Zhen Wei, Enbo
Copyright Year	2012
Abstract	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.
Starting Page	147
Ending Page	152
Page Count	6
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	11
Issue Number	2
e-ISSN	19935021
Language	English
Publisher	SP Science Press
Publisher Date	2012-04-29
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cost function sea surface salinity and temperature brightness temperature Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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