Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/61190
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Heinrich event 1: an example of dynamical ice-sheet reaction to oceanic changes |
Autor: | Álvarez-Solas, J. CSIC ORCID; Montoya, Marisa CSIC; Ritz, Catherine; Ramstein, Gilles; Charbit, Sylvie; Dumas, Christophe; Nisanciogl, Kerim; Dokken, Trond; Ganopolski, Andrey | Palabras clave: | Climatología Heinrich events Paleoclimatología |
Fecha de publicación: | 29-nov-2011 | Editor: | Copernicus Publications | Citación: | ÁLVAREZ-SOLAS ,J., MONTOYA, M., RITZ, C., RAMSTEIN, G., CHARBIT, S., DUMAS, C., NISANCIOGLU, K., DOKKEN, T., GANOPOLSKI, A. (2011). Heinrich event 1: an example of dynamical ice-sheet reaction to oceanic changes. Climate of the Past, 7, 1297-1306. | Resumen: | Heinrich events, identified as enhanced ice-rafted detritus (IRD) in North Atlantic deep sea sediments (Heinrich, 1988; Hemming, 2004) have classically been attributed to Laurentide ice-sheet (LIS) instabilities (MacAyeal, 1993; Calov et al., 2002; Hulbe et al., 2004) and assumed to lead to important disruptions of the Atlantic meridional overturning circulation (AMOC) and North Atlantic deep water (NADW) formation. However, recent paleoclimate data have revealed that most of these events probably occurred after the AMOC had already slowed down or/and NADW largely collapsed, within about a thousand years (Hall et al., 2006; Hemming, 2004; Jonkers et al., 2010; Roche et al., 2004), implying that the initial AMOC reduction could not have been caused by the Heinrich events themselves. Here we propose an alternative driving mechanism, specifically for Heinrich event 1 (H1; 18 to 15 ka BP), by which North Atlantic ocean circulation changes are found to have strong impacts on LIS dynamics. By combining simulations with a coupled climate model and a three-dimensional ice sheet model, our study illustrates how reduced NADW and AMOC weakening lead to a subsurface warming in the Nordic and Labrador Seas resulting in rapid melting of the Hudson Strait and Labrador ice shelves. Lack of buttressing by the ice shelves implies a substantial ice-stream acceleration, enhanced ice-discharge and sea level rise, with peak values 500–1500 yr after the initial AMOC reduction. Our scenario modifies the previous paradigm of H1 by solving the paradox of its occurrence during a cold surface period, and highlights the importance of taking into account the effects of oceanic circulation on ice-sheets dynamics in order to elucidate the triggering mechanism of Heinrich events. | Versión del editor: | http://dx.doi.org/10.5194/cp-7-1297-2011 | URI: | http://hdl.handle.net/10261/61190 | DOI: | 10.5194/cp-7-1297-2011 |
Aparece en las colecciones: | (IGEO) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
cp-7-1297-2011.pdf | Paper | 2,56 MB | Adobe PDF | Visualizar/Abrir |
Supinfo_he1_CP_def.pdf | Suplemento | 78,15 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
91
checked on 05-may-2024
WEB OF SCIENCETM
Citations
84
checked on 25-feb-2024
Page view(s)
472
checked on 06-may-2024
Download(s)
488
checked on 06-may-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.