Universität zu Köln

Kaboth-Bahr, Stefanie ORCID: 0000-0002-4449-2938, Bahr, Andre, Stepanek, Christian ORCID: 0000-0002-3912-6271, Catunda, Maria Carolina Amorim, Karas, Cyrus ORCID: 0000-0002-7436-5016, Ziegler, Martin ORCID: 0000-0003-3198-6434, Garcia-Gallardo, Angela and Grunert, Patrick (2021). Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations. Commun. Earth Environ., 2 (1). LONDON: SPRINGERNATURE. ISSN 2662-4435

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Abstract

The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface temperatures in the high latitude North Atlantic Ocean rose between 2.9-2.7 million years ago. Here we present sedimentary geochemical proxy data from the Gulf of Cadiz to reconstruct the variability of Mediterranean Outflow Water, an important heat source to the North Atlantic. We find evidence for enhanced production of Mediterranean Outflow from the mid-Pliocene to the late Pliocene which we infer could have driven a sub-surface heat channel into the high-latitude North Atlantic. We then use Earth System Models to constrain the impact of enhanced Mediterranean Outflow production on the northward heat transport in the North Atlantic. In accord with the proxy data, the numerical model results support the formation of a sub-surface channel that pumped heat from the subtropics into the high latitude North Atlantic. We further suggest that this mechanism could have delayed ice sheet growth at the end of the Pliocene. Subsurface heat transfer from the subtropical Atlantic Ocean to high latitudes during the mid-to-late Pliocene may have been responsible for a delay in the intensification of Northern Hemisphere glaciations, according to sedimentary proxy records and numerical modelling.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kaboth-Bahr, Stefanie UNSPECIFIED orcid.org/0000-0002-4449-2938 UNSPECIFIED Bahr, Andre UNSPECIFIED UNSPECIFIED UNSPECIFIED Stepanek, Christian UNSPECIFIED orcid.org/0000-0002-3912-6271 UNSPECIFIED Catunda, Maria Carolina Amorim UNSPECIFIED UNSPECIFIED UNSPECIFIED Karas, Cyrus UNSPECIFIED orcid.org/0000-0002-7436-5016 UNSPECIFIED Ziegler, Martin UNSPECIFIED orcid.org/0000-0003-3198-6434 UNSPECIFIED Garcia-Gallardo, Angela UNSPECIFIED UNSPECIFIED UNSPECIFIED Grunert, Patrick UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-596708
DOI:	10.1038/s43247-021-00232-5
Journal or Publication Title:	Commun. Earth Environ.
Volume:	2
Number:	1
Date:	2021
Publisher:	SPRINGERNATURE
Place of Publication:	LONDON
ISSN:	2662-4435
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PANAMANIAN SEAWAY CLOSURE; OUTFLOW WATER DYNAMICS; LATE PLIOCENE; MONSOON VARIABILITY; OCEAN CIRCULATION; CLIMATE; MODEL; GULF; PRECESSION; INSIGHTS Multiple languages Environmental Sciences; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59670