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Haline hurricane wake in the Amazon/Orinoco plume: AQUARIUS/SACD and SMOS observations
Author(s) -
Grodsky Semyon A.,
Reul Nicolas,
Lagerloef Gary,
Reverdin Gilles,
Carton James A.,
Chapron Bertrand,
Quilfen Yves,
Kudryavtsev Vladimir N.,
Kao HsunYing
Publication year - 2012
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2012gl053335
Subject(s) - plume , tropical cyclone , sea surface temperature , amazon rainforest , environmental science , climatology , panache , tropical atlantic , oceanography , la niña , geology , salinity , atmospheric sciences , meteorology , geography , el niño southern oscillation , ecology , biology
At its seasonal peak the Amazon/Orinoco plume covers a region of 10 6 km 2 in the western tropical Atlantic with more than 1 m of extra freshwater, creating a near‐surface barrier layer (BL) that inhibits mixing and warms the sea surface temperature (SST) to >29°C. Here new sea surface salinity (SSS) observations from the Aquarius/SACD and SMOS satellites help elucidate the ocean response to hurricane Katia, which crossed the plume in early fall, 2011. Its passage left a 1.5 psu high haline wake covering >10 5 km 2 (in its impact on density, the equivalent of a 3.5°C cooling) due to mixing of the shallow BL. Destruction of this BL apparently decreased SST cooling in the plume, and thus preserved higher SST and evaporation than outside. Combined with SST, the new satellite SSS data provide a new and better tool to monitor the plume extent and quantify tropical cyclone upper ocean responses with important implications for forecasting.