Universität zu Köln

Winterfeld, Maria, Schirrmeister, Lutz ORCID: 0000-0001-9455-0596, Grigoriev, Mikhail N., Kunitsky, Viktor V., Andreev, Andrei ORCID: 0000-0002-8745-9636, Murray, Andrew ORCID: 0000-0001-5559-1862 and Overduin, Pier Paul (2011). Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea, Siberia. Boreas, 40 (4). S. 697 - 714. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

The palaeoenvironmental development of the western Laptev Sea is understood primarily from investigations of exposed cliffs and surface sediment cores from the shelf. In 2005, a core transect was drilled between the Taymyr Peninsula and the Lena Delta, an area that was part of the westernmost region of the non-glaciated Beringian landmass during the late Quaternary. The transect of five cores, one terrestrial and four marine, taken near Cape Mamontov Klyk reached 12km offshore and 77m below sea level. A multiproxy approach combined cryolithological, sedimentological, geochronological (C-14-AMS, OSL on quartz, IR-OSL on feldspars) and palaeoecological (pollen, diatoms) methods. Our interpretation of the proxies focuses on landscape history and the transition of terrestrial into subsea permafrost. Marine interglacial deposits overlain by relict terrestrial permafrost within the same offshore core were encountered in the western Laptev Sea. Moreover, the marine interglacial deposits lay unexpectedly deep at 64m below modern sea level 12km from the current coastline, while no marine deposits were encountered onshore. This implies that the position of the Eemian coastline presumably was similar to today's. The landscape reconstruction suggests Eemian coastal lagoons and thermokarst lakes, followed by Early to Middle Weichselian fluvially dominated terrestrial deposition. During the Late Weichselian, this fluvial landscape was transformed into a poorly drained accumulation plain, characterized by widespread and broad ice-wedge polygons. Finally, the shelf plain was flooded by the sea during the Holocene, resulting in the inundation and degradation of terrestrial permafrost and its transformation into subsea permafrost.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Winterfeld, Maria UNSPECIFIED UNSPECIFIED UNSPECIFIED Schirrmeister, Lutz UNSPECIFIED orcid.org/0000-0001-9455-0596 UNSPECIFIED Grigoriev, Mikhail N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kunitsky, Viktor V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Andreev, Andrei UNSPECIFIED orcid.org/0000-0002-8745-9636 UNSPECIFIED Murray, Andrew UNSPECIFIED orcid.org/0000-0001-5559-1862 UNSPECIFIED Overduin, Pier Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-488022
DOI:	10.1111/j.1502-3885.2011.00203.x
Journal or Publication Title:	Boreas
Volume:	40
Number:	4
Page Range:	S. 697 - 714
Date:	2011
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BOLSHOY LYAKHOVSKY ISLAND; CORAL TERRACES; SEDIMENTS; SHELF; REGION; ENVIRONMENT; HISTORY; CLIMATE; RECORD; THERMOKARST Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48802