Data/hora: 09/06/2024 06:09:58

Provedor de dados: 	5	
País: 	France	
Título: 	Ice-shelf collapse from subsurface warming as a trigger for Heinrich events	
Autores: 	Marcott, Shaun A.; Clark, Peter U.; Padman, Laurie; Klinkhammer, Gary P.; Springer, Scott R.; Liu, Zhengyu; Otto-bliesner, Bette L.; Carlson, Anders E.; Ungerer, Andy; Padman, June; He, Feng; Cheng, Jun; Schmittner, Andreas.	
Data: 	2011-08	
Ano: 	2011	
Palavras-chave: 	Paleoceanography; Paleoclimatology; Abrupt climate change.	
Resumo: 	Episodic iceberg-discharge events from the Hudson Strait Ice Stream (HSIS) of the Laurentide Ice Sheet, referred to as Heinrich events, are commonly attributed to internal ice-sheet instabilities, but their systematic occurrence at the culmination of a large reduction in the Atlantic meridional overturning circulation (AMOC) indicates a climate control. We report Mg/Ca data on benthic foraminifera from an intermediate-depth site in the northwest Atlantic and results from a climate-model simulation that reveal basin-wide subsurface warming at the same time as large reductions in the AMOC, with temperature increasing by approximately 2 C over a 1-2 kyr interval prior to a Heinrich event. In simulations with an ocean model coupled to a thermodynamically active ice shelf, the increase in subsurface temperature increases basal melt rate under an ice shelf fronting the HSIS by a factor of approximately 6. By analogy with recent observations in Antarctica, the resulting ice-shelf loss and attendant HSIS acceleration would produce a Heinrich event.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00227/33819/32479.pdf

https://archimer.ifremer.fr/doc/00227/33819/32480.pdf

DOI:10.1073/pnas.1104772108

https://archimer.ifremer.fr/doc/00227/33819/	
Editor: 	Natl Acad Sciences	
Formato: 	application/pdf	
Fonte: 	Proceedings Of The National Academy Of Sciences Of The United States Of America (0027-8424) (Natl Acad Sciences), 2011-08 , Vol. 108 , N. 33 , P. 13415-13419	
Fonte: 	2011 National Academy of Sciences.

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