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Establishment of modern circulation pattern atc. 6000 cal a BP in Disko Bugt, central West Greenland : opening of the Vaigat Strait.

Perner, Kerstin and Moros, Matthias and Snowball, Ian and Lloyd, Jeremy M. and Kuijpers, Antoon and Richter, Thomas (2013) 'Establishment of modern circulation pattern atc. 6000 cal a BP in Disko Bugt, central West Greenland : opening of the Vaigat Strait.', Journal of quaternary science., 28 (5). pp. 480-489.

Abstract

Variations in the Holocene circulation of the West Greenland Current (WGC) in the Disko Bugt region have been reconstructed from a suite of sediment cores. Palaeoceanographic proxies include magnetic susceptibility (MS) and X-ray fluorescence titanium counts, which document a major shift in circulation at c. 6000 cal a BP. Before this date, sediments in southern Disko Bugt were characterized by high terrigeneous and basaltic input, suggesting widespread influence of meltwater plumes. Our data show that the WGC re-circulated in the southern Disko Bugt area because a potential northern pathway, the narrow Vaigat Strait, was blocked by icebergs that calved from marine outlet glaciers in eastern Disko Bugt. Sediments in southern Disko Bugt deposited after c. 6000 cal a BP have significantly lower terrestrial and basaltic sediment input, which coincides with minimum Holocene ice sheet extent. The reduced meltwater and iceberg discharge to the embayment caused the Vaigat Strait to become free of blocking icebergs and terrigenous input was partly diverted to the outer shelf. Thus, the modern circulation pattern of the WGC was established in the Disko Bugt region through the opening of the Vaigat Strait c. 6000 cal a BP.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/jqs.2638
Publisher statement:This is the accepted version of the following article: Perner, Kerstin, Moros, Matthias, Snowball, Ian, Lloyd, Jeremy M., Kuijpers, Antoon & Richter, Thomas (2013). Establishment of modern circulation pattern atc. 6000 cal a BP in Disko Bugt, central West Greenland: opening of the Vaigat Strait. Journal of Quaternary Science 28(5): 480-489, which has been published in final form at https://doi.org/10.1002/jqs.2638. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Date accepted:15 March 2013
Date deposited:11 May 2017
Date of first online publication:05 June 2013
Date first made open access:No date available

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