期刊
QUATERNARY SCIENCE REVIEWS
卷 91, 期 -, 页码 204-217出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2013.08.019
关键词
Holocene; Ice-rafting; Ice bergs; East Greenland; Iceland
资金
- National Science Foundation from the Office of Polar Programs [1107761]
- NSF [OCE-98-09001, 2262, 2263/2264, 2322]
- Natural Environmental Research Council (NERC) [NE/H023402/1]
- [JR51GGC35]
- Directorate For Geosciences
- Division Of Polar Programs [1107761] Funding Source: National Science Foundation
- Natural Environment Research Council [NE/H023402/1] Funding Source: researchfish
- NERC [NE/H023402/1] Funding Source: UKRI
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 fraction of far-travelled sediments in the Denmark Strait environs is overwhelmingly of local, mid-East Greenland, provenance, and therefore with a significant cross-channel component to their travel. The Holocene record of ice-rafted sediments denotes a three-part division of the Holocene in terms of iceberg sediment transport with a notable increase in the process starting ca 4000 cal yr BP. This latter increase may represent the re-advance during the Neoglacial period of land-terminating glaciers on the Geikie Plateau to become marine-terminating. The contrast in spectral signals between these cores and the 1500-yr cycle at VM28-14, just south of the Denmark Strait, combined with the coupled iceberg-model results, leads us to speculate that the signal at VM28-14 reflects pulses in overflow waters, rather than an ice-rafted signal. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
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