Multisensor observations of the Amazon-Orinoco river plume interactions with hurricanes

Type Publication
Date 2014-12
Language English
Copyright 2014. American Geophysical Union. All Rights Reserved.
Author(s) Reul NicolasORCID1, Quilfen Yves1, Chapron Bertrand1, Fournier Severine1, Kudryavtsev Vladimir2, Sabia Roberto3
Affiliation(s) 1 : Inst Francais Rech & Exploitat Mer, Lab Oceanog Spatiale, Plouzane, France.
2 : Russian State Hydrometeorol Univ, Satellite Oceanog Lab, St Petersburg, Russia.
3 : ESA ESRIN, Applicat & Future Technol Dept, EO Sci, European Space Agcy, Rome, Italy.
Source Journal Of Geophysical Research-oceans (0148-0027) (Amer Geophysical Union), 2014-12 , Vol. 119 , N. 12 , P. 8271-8295
DOI 10.1002/2014JC010107
WOS© Times Cited 17
Keyword(s) hurricanes, Amazon-Orinocco river plume, SMOS SSS, cooling inhibition, barrier-layer, haline stratification
Abstract An analysis is presented for the spatial and intensity distributions of North Atlantic extreme atmospheric events crossing the buoyant Amazon-Orinoco freshwater plume. The sea surface cooling amplitude in the wake of an ensemble of storm tracks traveling in that region is estimated from satellite products for the period 1998-2012. For the most intense storms, cooling is systematically reduced by approximate to 50% over the plume area compared to surroundings open-ocean waters. Historical salinity and temperature observations from in situ profiles indicate that salt-driven vertical stratification, enhanced oceanic heat content, and barrier-layer presence within the plume waters are likely key oceanic factors to explain these results. Satellite SMOS surface salinity data combined with in situ observations are further used to detail the oceanic response to category 4 hurricane Igor in 2010. Argo and satellite measurements confirm the haline stratification impact on the cooling inhibition as the hurricane crossed the river plume. Over this region, the SSS mapping capability is further tested and demonstrated to monitor the horizontal distribution of the vertical stratification parameter. SMOS SSS data can thus be used to consistently anticipate the cooling inhibition in the wake of TCs traveling over the Amazon-Orinoco plume region.
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Reul Nicolas, Quilfen Yves, Chapron Bertrand, Fournier Severine, Kudryavtsev Vladimir, Sabia Roberto (2014). Multisensor observations of the Amazon-Orinoco river plume interactions with hurricanes. Journal Of Geophysical Research-oceans, 119(12), 8271-8295. Publisher's official version : http://doi.org/10.1002/2014JC010107 , Open Access version : http://archimer.ifremer.fr/doc/00252/36326/