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| Awo, F. M.; Alory, G.; Da-allada, Casimir Yelognisse; Delcroix, T.; Jouanno, J.; Kestenare, E.; Baloitcha, E.. |
| The characteristic sea surface salinity (SSS) patterns associated with the tropical Atlantic meridional and equatorial interannual modes are extracted from in situ observations, by a statistical analysis performed on the 1980–2012 period. These SSS signatures of the interannual climatic modes are reproduced in a regional numerical simulation. For each mode, oceanic and/or atmospheric processes driving the SSS signature are identified through a mixed‐layer salt budget in the validated model. During a positive meridional mode in spring, a northward shift of the Intertropical Convergence Zone and related precipitation maximum creates a south‐north dipole of positive‐negative SSS anomalies around the equator. Western boundary currents strengthen and advect... |
| Tipo: Text |
Palavras-chave: Sea surface salinity; Tropical Atlantic; Interannual climatic modes. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00463/57517/59694.pdf |
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| Tchilibou, M.; Delcroix, T.; Alory, G.; Arnault, S.; Reverdin, G.. |
| This study focuses on the time-space variability of the low Sea Surface Salinity (SSS) waters extending zonally within 2 degrees N-12 degrees N in the Atlantic and Pacific and within 6 degrees S-16 degrees S in the western third of the Pacific. The analysis is based on a combination of in situ SSS observations collected in the last three decades from voluntary observing ships, TAO/TRITON and PIRATA moorings, Argo floats, and (few) CTD profiles. The mean latitudes of the Atlantic and Pacific low SSS waters appear 18-38 further poleward than the Evaporation minus Precipitation (E-P) minima linked to the Inter Tropical Convergence Zones (ITCZ) and South Pacific Convergence Zone (SPCZ). At the seasonal time scale, the E-P minima migrate poleward in summer... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00624/73562/73201.pdf |
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| Reul, Nicolas; Chapron, Bertrand; Lee, T.; Donlon, Craig; Boutin, Jacqueline; Alory, G.. |
| Measurements from the Soil Moisture Ocean Salinity (SMOS) satellite acquired during 2012 in the western North Atlantic are used to reveal the evolution of the sea surface salinity (SSS) structure of the meandering Gulf Stream with an unprecedented space and time resolution. Combined with in situ surface and profile measurements, satellite-derived surface currents, sea surface height (SSH), surface temperature (SST), and chlorophyll (Chl) data, SMOS SSS observations are shown to coherently delineate meanders pinching off from the current to form well-identified salty- (warm-) and fresh- (cold-) core Gulf Stream rings. A covariance analysis at two locations along the separated Gulf stream path (south of Nova Scotia and in the Gulf Stream Extension) reveals a... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00188/29974/28427.pdf |
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