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| Evangelista, H.; Sifeddine, A.; Correge, T.; Servain, J.; Dassie, E. P.; Logato, R.; Cordeiro, R. C.; Shen, C. -c.; Le Cornec, F.; Nogueira, J.; Segal, B.; Castagna, A.; Turcq, B.. |
| Although relatively rare compared to similar latitudes in the Pacific or Indian Oceans, massive coral colonies are present in the Tropical/Equatorial Southwestern Atlantic Ocean. However, detailed geo-chemical compositions of these corals are still largely unknown. In this work, we present growth rates, Sr/Ca, and U/Ca ratios of the coral colony (Siderastrea stellata) sampled at Rocas Atoll, off the Brazilian coast. These variables are primarily affected by sea surface temperature (SST) at seasonal scale, and by wind stress at interannual scale, these results represent a broad new finding. A lower significance at the interannual time scale between Sr/Ca and U/Ca with respect to SST is attributed to the low SST amplitude closed to Equator. An investigation... |
| Tipo: Text |
Palavras-chave: Coral; Siderastrea stellata; Rocas Atoll; ITCZ; Equatorial Atlantic; Wind stress. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00623/73552/73796.pdf |
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| Hounsou-gbo, G. A.; Araujo, M.; Bourles, Bernard; Veleda, D.; Servain, J.. |
| Tropical Atlantic (TA) Ocean-atmosphere interactions and their contributions to strong variability of rainfall along the Northeast Brazilian (NEB) coast were investigated for the years 1974-2008. The core rainy seasons of March-April and June-July were identified for Fortaleza (northern NEB; NNEB) and Recife (eastern NEB; ENEB), respectively. Lagged linear regressions between sea surface temperature (SST) and pseudo wind stress (PWS) anomalies over the entire TA and strong rainfall anomalies at Fortaleza and Recife show that the rainfall variability of these regions is differentially influenced by the dynamics of the TA. When the Intertropical Convergence Zone is abnormally displaced southward a few months prior to the NNEB rainy season, the associated... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00624/73567/73008.pdf |
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| Servain, J.; Seva, M. |
| Nous avons démontré dans les précédents rapports scientifiques que la variabilité interannuelle de l'Atlantique tropical n'était pas aussi faible que pouvaient le laisser supposer certains travaux ultérieurs. Afin d'étayer notre propos nous avions construit puis analysé des fichiers pluri-mensuels de la tension du vent et de la température de surface de la mer (SST) couvrant l'ensemble du bassin tropical atlantique durant les années 1964-1979. Nous complétons ici cette information par l'usage sur ces fichiers de techniques statistiques plus élaborées, basées notamment sur des analyses en composantes principales (ou analyse en Fonctions Orthogonales, EOFs). |
| Tipo: Text |
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| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00105/21646/19227.pdf |
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