Remote Sensing of Sea Surface Salinity From CAROLS L-Band Radiometer in the Gulf of Biscay

Type Article
Date 2012-05
Language English
Author(s) Martin Adrien1, Boutin Jacqueline1, Hauser Daniele2, 3, Reverdin Gilles1, Parde Mickael2, 3, Zribi Mehrez4, Fanise Pascal2, 3, Chanut Jerome5, Lazure PascalORCID6, Tenerelli Joseph7, Reul NicolasORCID6
Affiliation(s) 1 : Univ Paris 06, Inst Pierre Simon Laplace, LOCEAN,Museum Natl Hist Nat, Unite Mixte Rech 7159,Ctr Natl Rech Sci,Inst Rech, F-75252 Paris, France.
2 : Univ Versailles St Quentin Yvelines, F-78280 Guyancourt, France.
3 : CNRS, Lab Atmospheres Milieux Observ Spatiales LATMOS, Inst Pierre Simon Laplace, F-78280 Guyancourt, France.
4 : CESBIO CNRS IRD UPS CNES, F-31000 Toulouse, France.
5 : Mercator, F-31000 Toulouse, France.
6 : IFREMER, F-29280 Plouzane, France.
7 : CLS, F-29280 Plouzane, France.
Source Ieee Transactions On Geoscience And Remote Sensing (0196-2892) (Ieee-inst Electrical Electronics Engineers Inc), 2012-05 , Vol. 50 , N. 5 , P. 1703-1715
DOI 10.1109/TGRS.2012.2184766
WOS© Times Cited 14
Keyword(s) L-band, microwave radiometry, remote sensing, retrieval method, sea surface salinity (SSS), Soil Moisture and Ocean Salinity (SMOS), wind speed
Abstract A renewal of interest for the radiometric L-band Sea Surface Salinity (SSS) remote sensing appeared in the 1990s and led to the Soil Moisture and Ocean Salinity (SMOS) satellite launched in November 2009 and to the Aquarius mission (launched in June 2011). However, due to low signal to noise ratio, retrieving SSS from L-band radiometry is very challenging. In order to validate and improve L-band radiative transfer model and salinity retrieval method used in SMOS data processing, the Cooperative Airborne Radiometer for Ocean and Land Studies (CAROLS) was developed. We analyze here a coastal flight (20 May 2009), in the Gulf of Biscay, characterized by strong SSS gradients (28 to 35 pss-78). Extensive in-situ measurements were gathered along the plane track. Brightness temperature (T-b) integrated over 800 ms correlates well with simulated T-b (correlation coefficients between 0.80 and 0.96; standard deviations of the difference of 0.2 K). Over the whole flight, the standard deviation of the difference between CAROLS and in-situ SSS is about 0.3 pss-78 more accurate than SSS fields derived from coastal numerical model or objective analysis. In the northern part of the flight, CAROLS and in-situ SSS agree. In the southern part, the best agreement is found when using only V-polarization measured at 30 degrees incidence angle or when using a multiparameter retrieval assuming large error on T-b (suggesting the presence of biases on H-polarization). When compared to high-resolution model SSS, the CAROLS SSS underlines the high SSS temporal variability in river plume and on continental shelf border, and the importance of using realistic river run-offs for modeling coastal SSS.
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Martin Adrien, Boutin Jacqueline, Hauser Daniele, Reverdin Gilles, Parde Mickael, Zribi Mehrez, Fanise Pascal, Chanut Jerome, Lazure Pascal, Tenerelli Joseph, Reul Nicolas (2012). Remote Sensing of Sea Surface Salinity From CAROLS L-Band Radiometer in the Gulf of Biscay. Ieee Transactions On Geoscience And Remote Sensing, 50(5), 1703-1715. Publisher's official version : , Open Access version :