Data/hora: 07/06/2024 01:31:32

Provedor de dados: 	5	
País: 	France	
Título: 	The last five glacial-interglacial transitions: A high-resolution 450,000-year record from the subantarctic Atlantic	
Autores: 	Cortese, G.; Abelmann, A.; Gersonde, R.	
Data: 	2007-10	
Ano: 	2007	
Palavras-chave: 	Paleotemperature; Radiolaria; Southern Ocean.	
Resumo: 	A submillennial resolution, radiolarian-based record of summer sea surface temperature (SST) documents the last five glacial to interglacial transitions at the subtropical front, southern Atlantic Ocean. Rapid fluctuations occur both during glacial and interglacial intervals, and sudden cooling episodes at glacial terminations are recurrent. Surface hydrography and global ice volume proxies from the same core suggest that summer SST increases prior to terminations lead global ice- volume decreases by 4.7 +/- 3.7 ka (in the eccentricity band), 6.9 +/- 2.5 ka (obliquity), and 2.7 +/- 0.9 ka (precession). A comparison between SST and benthic delta C-13 suggests a decoupling in the response of northern subantarctic surface, intermediate, and deep water masses to cold events in the North Atlantic. The matching features between our SST record and the one from core MD97-2120 (southwest Pacific) suggests that the super-regional expression of climatic events is substantially affected by a single climatic agent: the Subtropical Front, amplifier and vehicle for the transfer of climatic change. The direct correlation between warmer Delta T-site at Vostok and warmer SST at ODP Site 1089 suggests that warmer oceanic/atmospheric conditions imply a more southward placed frontal system, weaker gradients, and therefore stronger Agulhas input to the Atlantic Ocean.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00236/34725/33297.pdf

DOI:10.1029/2007PA001457

https://archimer.ifremer.fr/doc/00236/34725/	
Editor: 	Amer Geophysical Union	
Formato: 	application/pdf	
Fonte: 	Paleoceanography (0883-8305) (Amer Geophysical Union), 2007-10 , Vol. 22 , N. 4/PA4203 , P. 1-14	
Fonte: 	Copyright 2007 by the American Geophysical Union.

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