Universität zu Köln

Depuydt, Pauline ORCID: 0000-0003-2884-1285, Mojtahid, Meryem, Barras, Christine, Bouhdayad, Fatima Zohra and Toucanne, Samuel ORCID: 0000-0002-4858-8953 (2022). Intermediate ocean circulation and cryosphere dynamics in the northeast Atlantic during Heinrich Stadials: benthic foraminiferal assemblage response. J. Quat. Sci., 37 (7). S. 1207 - 1222. HOBOKEN: WILEY. ISSN 1099-1417

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Abstract

The interaction between ocean circulation and ice-sheet dynamics plays a key role in the Quaternary climate. Compared with the surface and deep regions of the Atlantic Meridional Overturning Circulation (AMOC), the study of intermediate depths during key time periods, such as Heinrich Stadials (HSs), remains poorly documented, especially for the northeast Atlantic. Here we use benthic foraminiferal assemblage data to trace palaeoenvironmental changes from similar to 32 to 14 ka cal BP at similar to 1000 m depth in the Bay of Biscay. Our results highlight the high sensitivity of foraminifera, with species-specific responses, to continental (European Ice Sheet dynamics) and marine (AMOC) forcing factors during the last three HSs. In general, HSs were characterised by the concomitant presence of meso-oligotrophic and anoxia indicator species and the low abundance of high-energy indicator species. This confirms an overall sluggish intermediate circulation during the three HSs in the northeast Atlantic. HS1 is distinctive for its abundance of high-organic flux indicator species during its early phase. This is consistent with the fact that HS1 was by far the most important period of ice-sheet retreat and meltwater release into the ocean over the studied time interval. Finally, foraminifera depict the mid-HS2 reventilation event due to regional glacier instabilities. (C) 2022 John Wiley & Sons, Ltd.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Depuydt, Pauline UNSPECIFIED orcid.org/0000-0003-2884-1285 UNSPECIFIED Mojtahid, Meryem UNSPECIFIED UNSPECIFIED UNSPECIFIED Barras, Christine UNSPECIFIED UNSPECIFIED UNSPECIFIED Bouhdayad, Fatima Zohra UNSPECIFIED UNSPECIFIED UNSPECIFIED Toucanne, Samuel UNSPECIFIED orcid.org/0000-0002-4858-8953 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-682438
DOI:	10.1002/jqs.3444
Journal or Publication Title:	J. Quat. Sci.
Volume:	37
Number:	7
Page Range:	S. 1207 - 1222
Date:	2022
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1099-1417
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MERIDIONAL OVERTURNING CIRCULATION; EUROPEAN ICE-SHEET; ARMORICAN MARGIN BAY; NE ATLANTIC; DEEP-WATER; FLEUVE MANCHE; PALEOCLIMATIC CHANGES; SURFACE SEDIMENTS; CONFIDENCE-LIMITS; CONTINENTAL-SLOPE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68243