Holocene climate variability in the Labrador Sea

Hoogakker, Babette A. A. and McCave, I. Nick and Elderfield, Henry and Hillaire-Marcel, Claude and Simstich, Johannes (2015) Holocene climate variability in the Labrador Sea. Journal of the Geological Society, 172 (2). pp. 272-277. ISSN 0016-7649 DOI 10.1144/jgs2013-097

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Abstract

Formation of Labrador Sea Water proper commenced about 7000 years ago during the Holocene interglacial. To test whether fresher surface water conditions may have inhibited Labrador Sea Water convection during the early Holocene we measured planktonic foraminiferal (Globigerina bulloides) oxygen isotopes (δ18O) and Mg/Ca ratios at Orphan Knoll (cores HU91-045-093 and MD95-2024, 3488 m) in the Labrador Sea to reconstruct shallow subsurface summer conditions (temperature and seawater δ18O). Lighter foraminiferal δ18O values are recorded during the early Holocene between 11000 and 7000 years ago. Part of these lighter foraminiferal δ18O values can be explained by increased calcification temperatures. Reconstructed seawater δ18O values were, however, still on average 0.5‰ lighter compared with those of recent times, confirming that fresher surface waters in the Labrador Sea were probably a limiting factor in Labrador Sea Water formation during the early Holocene.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA68;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Journal of the Geological Society
Volume: 172
Page Range: pp. 272-277
Identification Number: 10.1144/jgs2013-097
Depositing User: Sarah Humbert
Date Deposited: 22 May 2015 16:27
Last Modified: 29 May 2015 11:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/3319

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