Upwelling intensification as part of the Pliocene-Pleistocene climate transition.
Science
; 290(5500): 2288-91, 2000 Dec 22.
Article
em En
| MEDLINE
| ID: mdl-11125138
ABSTRACT
A deep-sea sediment core underlying the Benguela upwelling system off southwest Africa provides a continuous time series of sea surface temperature (SST) for the past 4.5 million years. Our results indicate that temperatures in the region have declined by about 10 degrees C since 3.2 million years ago. Records of paleoproductivity suggest that this cooling was associated with an increase in wind-driven upwelling tied to a shift from relatively stable global warmth during the mid-Pliocene to the high-amplitude glacial-interglacial cycles of the late Quaternary. These observations imply that Atlantic Ocean surface water circulation was radically different during the mid-Pliocene.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Clima
/
Diatomáceas
/
Sedimentos Geológicos
País/Região como assunto:
Africa
Idioma:
En
Revista:
Science
Ano de publicação:
2000
Tipo de documento:
Article