Data/hora: 09/06/2024 08:38:08

Provedor de dados: | 5
País: | France
Título: | A 0.55-Ma paleotemperature record from the Subantarctic zone: Implications for Antarctic Circumpolar Current development
Autores: | Becquey, S; Gersonde, R.
Data: | 2003-03
Ano: | 2003
Palavras-chave: | Subantarctic zone; Sea surface temperatures; Planktic foraminifers; Ice rafted debris; Climate.
Resumo: | Estimates of summer sea surface temperatures (SSSTs) derived from planktic foraminiferal associations using the Modern Analog Technique and combined with isotopic analyses and determination of ice-rafted debris, mirror the Pleistocene evolution of the planktic Subantarctic surface waters in the Atlantic Ocean. The SSSTs indicate that the isotherms that define the modern polar front zone and Subantarctic front, were located at more northerly latitudes (up to 7degrees) during most of the investigated period, which covers the past 550 kyr. Exceptions are during climatic optima in the early Holocene, at marine isotope stages (MIS) 5.5, 7.1, 7.5, 9.3, and presumably during MIS 11.3 when SSSTs exceeded modern values by 1degrees-5degreesC. The close similarity between the SSST and the Vostok temperature indicates strong regional temperature correlation. Both records show that MIS 9.3 was the warmest period during the last 420 kyr whereas SSSTs obtained for MIS 11.3 are overestimated due to strong carbonate dissolution. Spectral analysis corroborates that the initiation of warming in southern high latitudes heralds the start of deglaciation on the Northern Hemisphere.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00224/33501/31947.pdf

DOI:10.1029/2000PA000576

https://archimer.ifremer.fr/doc/00224/33501/

Editor: | Amer Geophysical Union
Formato: | application/pdf
Fonte: | Paleoceanography (0883-8305) (Amer Geophysical Union), 2003-03 , Vol. 18 , N. 1 , P. 14.1-14.14

Fonte:

Copyright 2003 by the American Geophysical Union.

info:eu-repo/semantics/openAccess

restricted use