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| Andrews, John T.; Bigg, Grant R.; Wilton, David J.. |
| We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define potential sediment sources, and these are examined within the context of the down-core variations in mineralogy in the <2 mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment <2 mm off NW and N Iceland exported across Denmark Strait; this averaged between 10 and 20%. Both the sediment unmixing model and the coupled iceberg-ocean model are consistent in finding that the... |
| Tipo: Text |
Palavras-chave: Holocene; Ice-rafting; Ice bergs; East Greenland; Iceland. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40150/39091.pdf |
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| Bigg, Grant R.; Levine, Richard C.; Green, Clare L.. |
| The abrupt delivery of large amounts of freshwater to the North Atlantic in the form of water or icebergs has been thought to lead to significant climate change, including abrupt slowing of the Atlantic Ocean meridional overturning circulation. In this paper we examine intermediate complexity coupled modelling evidence to estimate the rates of change, and recovery, in oceanic climate that would be expected for such events occurring during glacial times from likely sources around the North Atlantic and Arctic periphery. We show that rates of climate change are slower for events with a European or Arctic origin. Palaeoceanographic data are presented to consider, through the model results, the origin and likely strength of major ice-rafting, or Heinrich,... |
| Tipo: Text |
Palavras-chave: Heinrich events; Modelling; Quaternary; Icebergs. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00227/33777/82665.pdf |
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