Foraminíferos planctônicos em resposta às mudanças oceanográficas no Atlântico Tropical oeste durante os últimos 30.000 anos / Planktonic foraminifera response to oceanographic changes in the western tropical Atlantic during the last 30,000 years

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The planktonic foraminiferal assemblages of two piston cores from western tropical Atlantic covering the last 30,000 years have been analysed together with paleoceanographic ANN sea surface temperature reconstruction and ?18O and ?13C of the shallow dwelling planntonic foraminifera Globigerinoides ruber white. These proxies reveal that during the Last Glacial Maximum and during the Heinrich 1 and Younger Dryas cold events, the western tropical experienced warm periods. This study suggest that during these warm intervals a pronounced accumulation of heat and salt occurred at western tropical Atlantic, as a result of cross-equatorial heat and salt transport decrease. At the end of these events, the intensification of cross-equatorial heat and salt transport cooled and freshened the western tropical surface waters. This study suggests the western tropical Atlantic served as a heat and salt reservoir during deglaciation.

ASSUNTO(S)

planktonic foraminifera south atlantic. last glacial maximum-holecene paleoceanografia último máximo glacial-holeceno paleoceanography atlântico sul forminíferos planctônicos

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