Universität zu Köln

Fedorov, Grigory ORCID: 0000-0003-2269-4501, Andreev, Andrei A., Raschke, Elena, Wennrich, Volker ORCID: 0000-0003-3617-1963, Schwamborn, Georg, Glushkova, Olga Y., Juschus, Olaf, Zander, Anja ORCID: 0000-0003-0449-1401 and Melles, Martin (2019). Middle to Late Pleistocene lake-level fluctuations of Lake El'gygytgyn, far-east Russian Arctic. Boreas, 48 (2). S. 516 - 534. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

Lake El'gygytgyn, located in central Chukotka, Russian Arctic, was the subject of an international drilling project that resulted in the recovery of the longest continuous palaeoclimatic and palaeoenvironmental record for the terrestrial Arctic covering the last 3.6 million years. Here, we present the reconstruction of the lake-level fluctuations of Lake El'gygytgyn since Marine Isotope Stage (MIS) 7 based on lithological and palynological as well as chronological studies of shallow-water sediment cores and subaerial lake terraces. Reconstructed lake levels show an abrupt rise during glacial-interglacial terminations (MIS 6/5 and MIS 2/1) and during the MIS 4/3 stadial-interstadial transition. The most prominent lowstands occurred during glacial periods associated with a permanent lake-ice cover (namely MIS 6, MIS 4 and MIS 2). Major triggering mechanisms of the lake-level fluctuations at Lake El'gygytgyn are predominantly changes in air temperature and precipitation. Regional summer temperatures control the volume of meltwater supply as well as the duration of the lake-ice cover (permanent or seasonal). The duration of the lake-ice cover, in turn, enables or hampers near-shore sediment transport, thus leading to long-term lake-level oscillations on glacial-interglacial time scales by blocking or opening the lake outflow, respectively. During periods of seasonal ice cover the lake level was additionally influenced by changes in precipitation. The discovered mechanism of climatologically driven level fluctuations of Lake El'gygytgyn are probably valid for large hydrologically open lakes in the Arctic in general, thus helping to understand arctic palaeohydrology and providing missing information for climate modelling.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fedorov, Grigory UNSPECIFIED orcid.org/0000-0003-2269-4501 UNSPECIFIED Andreev, Andrei A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Raschke, Elena UNSPECIFIED UNSPECIFIED UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Schwamborn, Georg UNSPECIFIED UNSPECIFIED UNSPECIFIED Glushkova, Olga Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Juschus, Olaf UNSPECIFIED UNSPECIFIED UNSPECIFIED Zander, Anja UNSPECIFIED orcid.org/0000-0003-0449-1401 UNSPECIFIED Melles, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-152198
DOI:	10.1111/bor.12367
Journal or Publication Title:	Boreas
Volume:	48
Number:	2
Page Range:	S. 516 - 534
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language VEGETATION HISTORY; CLIMATE CHANGES; IMPACT CRATER; SEDIMENT; CHUKOTKA; RECORD; ICE; AGE; VARIABILITY; DYNAMICS Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15219