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Sea Surface Freshening Inferred from Smos and Argo Salinity: Impact of Rain : Volume 9, Issue 5 (18/10/2012)

By Boutin, J.

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Book Id: WPLBN0003978654
Format Type: PDF Article :
File Size: Pages 27
Reproduction Date: 2015

Title: Sea Surface Freshening Inferred from Smos and Argo Salinity: Impact of Rain : Volume 9, Issue 5 (18/10/2012)  
Author: Boutin, J.
Volume: Vol. 9, Issue 5
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Yin, X., Reverdin, G., Gaillard, F., Boutin, J., & Martin, N. (2012). Sea Surface Freshening Inferred from Smos and Argo Salinity: Impact of Rain : Volume 9, Issue 5 (18/10/2012). Retrieved from http://worldlibrary.net/


Description
Description: CNRS-INSU, LOCEAN/IPSL (CNRS-UPMC-IRD-MNHN), Paris, France. The sea surface salinity (SSS) measured from space by the Soil Moisture and Ocean Salinity (SMOS) mission has recently been revisited by the European Space Agency first campaign reprocessing. We show that, with respect to the previous version, biases close to land and ice greatly decrease. The accuracy of SMOS SSS averaged over 10 days 100 × 100 km2 in the open ocean and estimated by comparison to ARGO SSS is on the order of 0.3–0.4 in tropical and subtropical regions and 0.5 in a cold region. The mean SSS −0.1 bias observed in the Tropical Pacific Ocean between 5° N and 15° N, relatively to other regions, is suppressed when SMOS rainy events, as detected on SSMIs rain rates, are removed from the SMOS-ARGO comparisons. The SMOS freshening is linearly correlated to SSMIs rain rate with a slope estimated to −0.14 mm−1 h, after correction for rain atmospheric contribution. This tendency is the signature of the temporal SSS variability between the time of SMOS and ARGO measurements linked to rain variability and of the vertical salinity stratification between the first centimeter of the sea surface layer sampled by SMOS and the 5 m depth sampled by ARGO. However, given that the whole set of collocations includes situations with rainy ARGO measurements collocated with non rainy SMOS measurements, the mean −0.1 bias and the negative skewness of the statistical distribution of SMOS minus ARGO SSS difference are very likely the mean signature of the vertical salinity stratification. In the future, the analysis of ongoing in situ salinity measurements in the top 50 cm of the sea surface and of Aquarius satellite SSS are expected to provide complementary information about the sea surface salinity stratification.

Summary
Sea surface freshening inferred from SMOS and ARGO salinity: impact of rain

Excerpt
Kainulainen, J., Colliander, A., Closa, J., Martin-Neira, M., Oliva, R., Buenadicha, G., Rubiales Alcaine, P., Hakkarainen, A., and Hallikainen, M. T.: Radiometric performance of the SMOS reference radiometers-Assessment after one year of operation, IEEE T. Geosci. Remote, 50, 1367–1383, doi:10.1109/tgrs.2011.2177273, 2012.; Kerr, Y. H., Waldteufel, P., Wigneron, J. P., Delwart, S., Cabot, F., Boutin, J., Escorihuela, M. J., Font, J., Reul, N., Gruhier, C., Juglea, S. E., Drinkwater, M. R., Hahne, A., Marti, X, Martin-Neira, M., and Mecklenburg, S.: The SMOS mission: new tool for monitoring key elements of the global water cycle, Proc. IEEE, 98, 666–687, doi:10.1109/jproc.2010.2043032, 2010.; Lagerloef, G., Boutin, J., Chao, Y., Delcroix, T., Font, J., Niiler, P., Reul, N., Riser, S., Schmitt, R., Stammer, D., and Wentz, F.: Resolving the Global Surface Salinity Field and Variations by Blending Satellite and In Situ Observations, Oceanobs'09: Sustained Ocean Observations and Information for Society, Venise, Italy, 21–25 September 2009, ESA Publication WPP-306, doi:doi:10.5270/OceanObs09.cwp.51, 2010.; Mecklenburg, S., Drusch, M., Kerr, Y. H., Font, J., Martin-Neira, M., Delwart, S., Buenadicha, G., Reul, N., Daganzo-Eusebio, E., Oliva, R., and Crapolicchio, R.: ESA's soil moisture and ocean salinity mission: mission performance and operations, IEEE T. Geosci. Remote, 50, 1354–1366, doi:10.1109/tgrs.2012.2187666, 2012.; Peichl, M., Wittmann, V., Anterrieu, E., Picard, B., Skou, N., and Solbjerg, S.: Scientific inputs for the SMOS Level 1 Processor development, Final report for ESA contract No. 10508/02/NL/GS, DLR, Munich, 2004.; Portabella, M., Stoffelen, A., Lin, W., Turiel, A., Verhoef, A., Verspeek, J., and Ballabrera-Poy, J.: Rain effects on ASCAT-retrieved winds: toward an improved quality control, IEEE T. Geosci. Remote, 50, 2495–2506, doi:10.1109/tgrs.2012.2185933, 2012.; Reul, N., Tenerelli, J., Boutin, J., Chapron, B., Paul, F., Brion, E., Gaillard, F., and Archer, O.: Overview of the first SMOS sea surface salinity products. Part I: Quality assessment for the second half of 2010, IEEE T. Geosci. Remote, 50, 1636–1647, doi:10.1109/tgrs.2012.2188408, 2012.; Reverdin, G., Morisset, S., Boutin, J., and Martin, N.: Rain-induced variability of near sea-surface T and S from drifter data, J. Geophys. Res., 117, C02032, doi:10.1029/2011jc007549, 2012.; Soloviev, A. and Lukas, R.: Observation of spatial variability of diurnal thermocline and rain-formed halocline in the Western Pacific warm pool, J. Phys. Oceanogr., 26, 2529–2538, doi:2.0.CO;2>10.1175/1520-0485(1996)026\textless2529:oosvod\textgreater2.0.CO;2, 1996.; Soloviev

 

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