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Freshening of the Labrador Sea as a trigger for Little Ice Age development

Alonso-Garcia, Montserrat, Kleiven, Helga (Kikki) F., McManus, Jerry F., Moffa Sanchez, Paola, Broecker, Wallace S. and Flower, Benjamin P. 2017. Freshening of the Labrador Sea as a trigger for Little Ice Age development. Climate of the Past 13 (4) , pp. 317-331. 10.5194/cp-13-317-2017

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Abstract

Arctic freshwater discharges to the Labrador Sea from melting glaciers and sea ice can have a large impact on ocean circulation dynamics in the North Atlantic, modifying climate and deep water formation in this region. In this study, we present for the first time a high resolution record of ice rafting in the Labrador Sea over the last millennium to assess the effects of freshwater discharges in this region on ocean circulation and climate. The occurrence of ice-rafted debris (IRD) in the Labrador Sea was studied using sediments from Site GS06-144-03 (57.29° N, 48.37° W; 3432 m water depth). IRD from the fraction 63–150 µm shows particularly high concentrations during the intervals  ∼  AD 1000–1100,  ∼  1150–1250,  ∼  1400–1450,  ∼  1650–1700 and  ∼  1750–1800. The first two intervals occurred during the Medieval Climate Anomaly (MCA), whereas the others took place within the Little Ice Age (LIA). Mineralogical identification indicates that the main IRD source during the MCA was SE Greenland. In contrast, the concentration and relative abundance of hematite-stained grains reflects an increase in the contribution of Arctic ice during the LIA.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: European Geosciences Union
ISSN: 1814-9332
Date of First Compliant Deposit: 10 July 2017
Date of Acceptance: 3 March 2017
Last Modified: 10 Jul 2017 09:45
URI: http://orca.cf.ac.uk/id/eprint/102225

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