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SMOS salinity in the subtropical North Atlantic salinity maximum: 2. Two‐dimensional horizontal thermohaline variability
Author(s) -
Kolodziejczyk Nicolas,
Hernandez Olga,
Boutin Jacqueline,
Reverdin Gilles
Publication year - 2015
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
eISSN - 2169-9291
pISSN - 2169-9275
DOI - 10.1002/2014jc010103
Subject(s) - thermohaline circulation , salinity , argo , subtropical front , mesoscale meteorology , temperature salinity diagrams , geology , front (military) , oceanography , climatology , subtropics , environmental science , water mass , fishery , biology
The horizontal thermohaline seasonal variability of the surface ocean is investigated in the subtropical North Atlantic Surface Salinity Maximum (SSSmax) region. Satellite sea surface temperature and salinity are used, along with high‐resolution thermosalinograph data, and Argo interpolated products, to study the horizontal two‐dimensional field of density and thermohaline variability. During late winter, compensated temperature and salinity gradients at large and mesoscale are observed northeast of the SSSmax, in the Azores Front Current region. In spite of the large and sharp surface thermohaline fronts, satellite measurements reveal a rather weak surface horizontal density gradient. During summer, the front is dominated by salinity gradients. South of the SSSmax, at large scales, the density ratio is controlled by the salinity gradient and the horizontal density gradient is enhanced by a constructive contribution of opposite salinity and temperature gradients.