Universität zu Köln

Max, Lars ORCID: 0000-0002-8637-4032, Nuernberg, Dirk ORCID: 0000-0002-7136-1896, Chiessi, Cristiano M., Lenz, Marlene M. and Mulitza, Stefan (2022). Subsurface ocean warming preceded Heinrich Events. Nat. Commun., 13 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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Abstract

Although the global environmental impact of Laurentide Ice-Sheet destabilizations on glacial climate during Heinrich Events is well-documented, the mechanism driving these ice-sheet instabilities remains elusive. Here we report foraminifera-based subsurface (similar to 150 m water depth) ocean temperature and salinity reconstructions from a sediment core collected in the western subpolar North Atlantic, showing a consistent pattern of rapid subsurface ocean warming preceding the transition into each Heinrich Event identified in the same core of the last 27,000 years. These results provide the first solid evidence for the massive accumulation of ocean heat near the critical depth to trigger melting of marine-terminating portions of the Laurentide Ice Sheet around Labrador Sea followed by Heinrich Events. The repeated build-up of a subsurface heat reservoir in the subpolar Atlantic closely corresponds to times of weakened Atlantic Meridional Overturning Circulation, indicating a precursor role of ocean circulation changes for initiating abrupt ice-sheet instabilities during Heinrich Events. We infer that a weaker ocean circulation in future may result in accelerated interior-ocean warming of the subpolar Atlantic, which could be critical for the stability of modern, marine-terminating Arctic glaciers and the freshwater budget of the North Atlantic.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Max, Lars UNSPECIFIED orcid.org/0000-0002-8637-4032 UNSPECIFIED Nuernberg, Dirk UNSPECIFIED orcid.org/0000-0002-7136-1896 UNSPECIFIED Chiessi, Cristiano M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenz, Marlene M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mulitza, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-679630
DOI:	10.1038/s41467-022-31754-x
Journal or Publication Title:	Nat. Commun.
Volume:	13
Number:	1
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SEA-SURFACE TEMPERATURE; NORTH-ATLANTIC OCEAN; NEOGLOBOQUADRINA-PACHYDERMA; ICE-SHEET; COLLAPSE; DISCHARGES; LAURENTIDE; ICEBERGS; SIGNALS; TRIGGER Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67963