Continued meltwater influence on North Atlantic Deep Water instabilities during the early Holocene

Elmore, A. C. and Wright, J. D. and Southon, J. (2015) Continued meltwater influence on North Atlantic Deep Water instabilities during the early Holocene. Marine Geology, 360. pp. 17-24. ISSN 0025-3227 DOI 10.1016/j.margeo.2014.11.015

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Abstract

The transition into the Holocene marks the last large, orbitally derived climatic event and ultimately led to the onset of modern oceanic conditions. The influence of this climatic change on North Atlantic Deep Water (NADW) formation and circulation remains ambiguous. High-resolution records from southern Gardar Drift, south of Iceland, show abrupt decreases in benthic foraminiferal δ13C values at discrete intervals during the early Holocene, suggesting that NADW shoaled episodically. Intervals of lower δ13C values are coincident with higher Δδ18ON. pachyderma (s)–G. bulloides and high abundance of lithic grains/g, indicating that these periods also had enhanced surface water stratification, due to increased meltwater in the circum-North Atlantic region. Our new high-resolution planktonic and benthic foraminiferal stable isotopic data show that increased meltwater delivery led to brief reorganizations of deepwater currents. These southern Gardar surface and deep water records indicate that the early Holocene was a period of multiple abrupt climatic events that were propagated to the North Atlantic during the final break up of ice sheets in the Northern Hemisphere, and suggest that some component of the residual early Holocene sea level rise can be attributed to Northern Hemispheric sources.

Item Type: Article
Uncontrolled Keywords: NILAREP; IA68,
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Marine Geology
Volume: 360
Page Range: pp. 17-24
Identification Number: 10.1016/j.margeo.2014.11.015
Depositing User: Sarah Humbert
Date Deposited: 22 Dec 2014 16:10
Last Modified: 22 Jan 2015 13:26
URI: http://eprints.esc.cam.ac.uk/id/eprint/3178

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