Sea Surface Salinity And Barrier Layer Variability In The Equatorial Pacific As Seen From Aquarius And Argo

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School of Ocean and Earth Science and Technology contribution number 9054 and International Pacific Research Center contribution IPRC-1033. 0 AMER GEOPHYSICAL UNION WASHINGTON J GEOPHYS RES-OCEANSThis study investigates the sea surface salinity (SSS) and barrier layer variability in the equatorial Pacific using recently available Aquarius and Argo data. Comparison between the two data sets indicates that Aquarius is able to capture most of the SSS features identified by Argo. Despite some discrepancies in the mean value, the SSS from the two data sets shows essentially the same seasonal cycle in both magnitude and phase. For the period of observation between August 2011 and July 2013 Aquarius nicely resolved the zonal displacement of the SSS front along the equator, showing its observing capacity of the western Pacific warm pool. Analysis of the Argo data provides further information on surface stratification. A thick barrier layer is present on the western side of the SSS front during all the period of observation, moving back and forth along the equator with its correlation with the Southern Oscillation Index exceeding 0.80. Generally, the thick barrier layer moves eastward during El Nino and westward during La Nina. The mechanisms responsible for this zonal displacement are discussed. Key Points Aquarius nicely resolved the SSS front along the equator in the western Pacific A thick barrier layer is always present on the western side of the SSS front Both the SSS front and thick barrier layer are highly correlated with ENS

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