Universität zu Köln

Steinig, Sebastian ORCID: 0000-0003-3700-1106, Dummann, Wolf ORCID: 0000-0001-6054-2440, Park, Wonsun ORCID: 0000-0002-6345-8428, Latif, Mojib, Kusch, Stephanie ORCID: 0000-0002-2708-4975, Hofmann, Peter and Floegel, Sascha (2020). Evidence for a regional warm bias in the Early Cretaceous TEX86 record. Earth Planet. Sci. Lett., 539. AMSTERDAM: ELSEVIER. ISSN 1385-013X

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Abstract

The Cretaceous Period (145-66 Ma) provides an opportunity to obtain insights into the adaptation of the climate system to increased atmospheric greenhouse gas concentrations. The organic paleothermometer TEX86 is one of the few proxies available for reconstructing quantitative estimates of upper ocean temperatures of this time period. Here we show that the sedimentary TEX86 signal in the Early Cretaceous North and South Atlantic shows systematic differences to other Cretaceous samples. In particular, the relative increase in the fractional abundances of the crenarchaeol isomer compared to crenarchaeol exhibits similarities with surface sediments from the modern Mediterranean and Red Sea. Dedicated climate model simulations suggest that the formation of warm and saline deep waters in the restricted North and South Atlantic may have influenced TEX86 export dynamics leading to a warm bias in reconstructed upper ocean temperatures. Applying a regional calibration from the modern Mediterranean and Red Sea to corresponding TEX86 data significantly improves the model-data fit for the Aptian Oceanic Anoxic Event 1a and the overall comparison with other temperature proxies for the Early Cretaceous. Our results demonstrate the need to consider regional and temporal changes of the TEX86-temperature relation for the reconstruction of deep-time ocean temperatures. (c) 2020 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Steinig, Sebastian UNSPECIFIED orcid.org/0000-0003-3700-1106 UNSPECIFIED Dummann, Wolf UNSPECIFIED orcid.org/0000-0001-6054-2440 UNSPECIFIED Park, Wonsun UNSPECIFIED orcid.org/0000-0002-6345-8428 UNSPECIFIED Latif, Mojib UNSPECIFIED UNSPECIFIED UNSPECIFIED Kusch, Stephanie UNSPECIFIED orcid.org/0000-0002-2708-4975 UNSPECIFIED Hofmann, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Floegel, Sascha UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-332490
DOI:	10.1016/j.epsl.2020.116184
Journal or Publication Title:	Earth Planet. Sci. Lett.
Volume:	539
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1385-013X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SEA-SURFACE TEMPERATURES; ISOPRENOID TETRAETHER LIPIDS; MEMBRANE-LIPIDS; OXYGEN-ISOTOPE; EARLY EOCENE; ATLANTIC; MODEL; CLIMATE; MIDDLE; CIRCULATION Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33249