| Registro completo |
| Provedor de dados: |
5
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| País: |
France
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| Título: |
Ice-shelf collapse from subsurface warming as a trigger for Heinrich events
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| 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
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| Data: |
2011-08
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| Ano: |
2011
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| Palavras-chave: |
Paleoceanography
Paleoclimatology
Abrupt climate change
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| 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/
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| Editor: |
Natl Acad Sciences
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| Formato: |
application/pdf
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| 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
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| Direitos: |
2011 National Academy of Sciences.
info:eu-repo/semantics/openAccess
restricted use
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