(Table 1) Radiocarbon and OSL ages of sediment cores C1-C5 drilled during the COAST expedition to Cape Mamontov Klyk in April 2005


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 12 km offshore and 77 m below sea level. A multiproxy approach combined cryolithological, sedimentological, geochronological (14C-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 64 m below modern sea level 12 km 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.

Depth, sediment/rock was obtained by substracting the given depth (m b.s.l.) by the height of the water body (sea level to sea bottom, see 'elevation'). For core C1, depth was given. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150

Supplement to: Winterfeld, Maria; Schirrmeister, Lutz; Grigoriev, Mikhail N; Kunitsky, Victor V; Andreev, Andrei A; Murray, Andrew Sean; Overduin, Pier Paul (2011): Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea, Siberia. Boreas, 40(4), 697-713

DOI https://doi.org/10.1594/PANGAEA.841929
Related Identifier https://doi.org/10.1111/j.1502-3885.2011.00203.x
Related Identifier https://doi.org/10.1111/j.1751-8369.2008.00067.x
Related Identifier https://doi.org/10.1594/PANGAEA.736029
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.841929
Creator Winterfeld, Maria ORCID logo; Schirrmeister, Lutz ORCID logo; Grigoriev, Mikhail N ORCID logo; Kunitsky, Victor V; Andreev, Andrei A ORCID logo; Murray, Andrew Sean ORCID logo; Overduin, Pier Paul ORCID logo
Publisher PANGAEA
Publication Year 2011
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 201 data points
Discipline Earth System Research
Spatial Coverage (117.125W, 73.606S, 117.177E, 73.710N); Cape Mamontov Klyk; Mamontovy Klyk
Temporal Coverage Begin 2003-08-12T00:00:00Z
Temporal Coverage End 2005-05-24T00:00:00Z