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|Title:||ESCLEROCRONOLOGIA, GEOQUÍMICA E REGISTRO CLIMÁTICO EM CORAL SIDERASTREA STELLATA DO ATOL DAS ROCAS, RN, BRASIL|
|Other Titles:||Sclerochronology, Geochemistry and climated record in coral siderastrea stellata from Atol das Rocas, RN, Brazil|
|Keywords:||Atlântico Tropical; Recifes de coral; Zona de Convergência Intertropical; Temperatura de Superfície do Mar; Datação U-Th; Tropical Atlantic; Coral reefs; Intertropical Convergence Zone; Sea Surface Temperature; U-Th dating|
|Abstract:||One colony growth rate of an endemic Brazilian coral Sideratrea stellata from Atol das Rocas Biological reserve (3° 45 S / 33° 4 0 O 3° 55 S / 33° 50 O), based on growth band counting and U-Th dating method, followed by geochemical analysis, revealed Sea Surface Temperature (SST) variability for the last 39 years. Results show a strong correlation between coral growth and Sr/Ca ratio, and also strong correlation between Sr/Ca and U/Ca. Growth, Sr/Ca and U/Ca indicate strong signal at decadal frequencies, corresponding to one of major South Tropical Atlantic variability. Moreover, it can be said that δ18O signal has showed good coherence with respect to ITCZ, pointing out to potential future studies about salinity fluctuations. However, the lack of correlation between SST and geochemical tracers can be attributed to instrumental SST data restriction for the study site, which comes from sparsely distributed oceanographic buyos (PIRATA). Insofar, this study highlights some important factors: the need for in situ SST registry in order to establish good correlations for SST and geochemical data; the clear relationship between coral growth and Sr/Ca, suggesting that this ratio may not be regulated by SST only for S. stellata; and the predominance decadal and semi-decadal variabilities at this region.|
|Appears in Collections:||TEDE sem arquivo|
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