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Comparison of spaceborne measurements of sea surface salinity and colored detrital matter in the Amazon plume ArchiMer
Fournier, Severine; Chapron, Bertrand; Salisbury, J.; Vandemark, Douglas; Reul, Nicolas.
Large rivers are key hydrologic components in oceanography, particularly regarding air-sea and land-sea exchanges and biogeochemistry. We enter now in a new era of Sea Surface Salinity (SSS) observing system from Space with the recent launches of the ESA Soil Moisture and Ocean Salinity (SMOS) and the NASA Aquarius/Sac-D missions. With these new sensors, we are now in an excellent position to revisit SSS and ocean color investigations in the tropical northwest Atlantic using multi-year remote sensing time series and concurrent in situ observations. The Amazon is the world's largest river in terms of discharge. In its plume, SSS and upper water column optical properties such as the absorption coefficient of colored detrital matter (acdm) are strongly...
Tipo: Text Palavras-chave: Amazon-Orinoco river plume; SMOS SSS; Conservative mixing; Ocean color; Salinity; Satellite oceanography.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00255/36610/35742.pdf
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Multisensor observations of the Amazon-Orinoco river plume interactions with hurricanes ArchiMer
Reul, Nicolas; Quilfen, Yves; Chapron, Bertrand; Fournier, Severine; Kudryavtsev, Vladimir; Sabia, Roberto.
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...
Tipo: Text Palavras-chave: Hurricanes; Amazon-Orinocco river plume; SMOS SSS; Cooling inhibition; Barrier-layer; Haline stratification.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00252/36326/34855.pdf
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Importance of the Equatorial Undercurrent on the Sea Surface Salinity in the Eastern Equatorial Atlantic in boreal spring ArchiMer
Da-allada, Casimir Yelognisse; Jouanno, J.; Gaillard, Fabienne; Kolodziejczyk, Nicolas; Maes, C.; Reul, Nicolas; Bourles, B..
The physical processes implied in the sea surface salinity (SSS) increase in the equatorial Atlantic Cold Tongue (ACT) region during boreal spring and the lag observed between boreal spring SSS maximum and sea surface temperature (SST) summer minimum are examined using mixed-layer salinity budgets computed from observations and model during the period 2010-2012. The boreal spring SSS maximum is mainly explained by an upward flux of high salinity originating from the core of the Equatorial Undercurrent (EUC) through vertical mixing and advection. The vertical mixing contribution to the mixed-layer salt budget peaks in April-May. It is controlled primarily by i) an increased zonal shear between the surface South Equatorial Current and the subsurface EUC and...
Tipo: Text Palavras-chave: Atlantic Cold Tongue; SMOS SSS; Model; EUC salinity maximum; Vertical processes.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00363/47396/47388.pdf
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