Universität zu Köln

Wetterich, S., Meyer, H., Fritz, M., Mollenhauer, G., Rethemeyer, J., Kizyakov, A., Schirrmeister, L. and Opel, T. (2021). Northeast Siberian Permafrost Ice-Wedge Stable Isotopes Depict Pronounced Last Glacial Maximum Winter Cooling. Geophys. Res. Lett., 48 (7). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

Stable isotopes (delta O-18, delta D) of wedge ice hold potential to reconstruct past winter climate conditions. Here, we present records of the marine isotope stages (MIS) 3 and 2 including the last Glacial maximum (LGM) from Bol'shoy Lyakhovsky Island (NE Siberia). MIS 3 wedge ice dated from 52 to 40 Kyr b2k varies between -32 and -29 parts per thousand in delta O-18. Colder LGM conditions are implied by delta O-18 of -37 parts per thousand around 25 Kyr b2k. Similar Deuterium excess values indicate comparable moisture sources during MIS 3 and MIS 2. Regional LGM climate reconstructions depend on the seasonal resolution of the proxies and model simulations. Our wedge-ice record reflects coldest winters during global minima in atmospheric CO2 and sea level. The extreme LGM winter cooling is not represented in model projections of global LGM climate where West Beringia shows noticeably little cooling or even warming in mean annual temperatures compared to the late Holocene.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wetterich, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meyer, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fritz, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mollenhauer, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kizyakov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schirrmeister, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Opel, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-581589
DOI:	10.1029/2020GL092087
Journal or Publication Title:	Geophys. Res. Lett.
Volume:	48
Number:	7
Date:	2021
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1944-8007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BOLSHOY LYAKHOVSKY ISLAND; GROUND-ICE; COASTAL REGION; CARBON-DIOXIDE; LAPTEV STRAIT; PAST CLIMATE; SEA-LEVEL; EAST; PALEOCLIMATE; HISTORY Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58158