A method for correcting regional bias in SMOS global salinity products -- Journal of Oceanology and Limnology,2015,33(4):1072-1084

	Cite this paper:
	TONG Xiaolin, WANG Zhenzhan, LI Qingxia. A method for correcting regional bias in SMOS global salinity products[J]. Journal of Oceanology and Limnology, 2015, 33(4): 1072-1084

A method for correcting regional bias in SMOS global salinity products

TONG Xiaolin^1,2,3, WANG Zhenzhan², LI Qingxia¹

1 Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
2 Key Laboratory of Microwave Remote Sensing, National Space Science Center/Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Physics and Electronics, Henan University, Kaifeng 475001, China

Abstract:

Soil Moisture and Ocean Salinity (SMOS) Level 3 (L3) sea surface salinity (SSS) products are provided by the Barcelona Expert Centre (BEC). Strong biases were observed on the SMOS SSS products, thus the data from the Centre Aval de Traitement des Donn閑s SMOS (CATDS) were adjusted for biases using a large-scale correction derived from observed differences between the SMOS SSS and World Ocean Atlas (WOA) climatology data. However, this large-scale correction method is not suitable for correcting the large gradient of salinity biases. Here, we present a method for the correction of SSS regional bias of the monthly L3 products. Based on the stable characteristics of the large SSS biases from month to month in some regions, corrected SMOS SSS maps can be obtained from the monthly mean values after removing the regional biases. The accuracy of the SMOS SSS measurements is greatly improved, especially near the coastline, at high latitudes, and in some open ocean regions. The SMOS and ISAS SSS data are also compared with Aquarius SSS to verify the corrected SMOS SSS data. The correction method presented here only corrects annual mean biases. The measurement accuracy of the SSS may be improved by considering the influence of atmospheric and ocean circulation in different seasons and years.

Key words: ocean salinity|microwave radiometry|sea surface|Soil Moisture and Ocean Salinity (SMOS)

Received: 2014-08-21 Revised: 2015-01-04

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