Early to middle Holocene changes in Laptev Sea water masses deduced from diatom and aquatic palynomorph assemblages.

Polyakova, Yelena I., Bauch, Henning A. and Klyuvitkina, Tatyana S. (2005) Early to middle Holocene changes in Laptev Sea water masses deduced from diatom and aquatic palynomorph assemblages. Global and Planetary Change, 48 (1-3). pp. 208-222. DOI 10.1016/j.gloplacha.2004.12.014.

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Abstract

On the basis of diatom and aquatic palynomorph assemblages in sediment cores obtained from the eastern Laptev Sea shelf, major phases of environmental change associated with the last postglacial global sea-level rise can be recognized for the time since 11.3 calendar years BP (cal. ka). Until 11 cal. ka, the outer Laptev Sea shelf (≥ 51 m paleodepth) was inundated and paleoenvironmental conditions were characterized by increased precipitation of river-loaded matter, primarily diatom plankton, in a river-proximal environment where reconstructed surface water salinities, using freshwater diatoms as proxy, remained below 9. The time interval 10.7–9.2 cal. ka was marked by a predominance of the dinoflagellate cyst Operculodinium centrocarpum as well as by the appearance of relatively warm-water indicative species in the outer Laptev Sea, probably due to enhanced influence of Atlantic Water at the continental margin. Because a continuously rising sea level resulted in an increasing distance between the investigated site and the southward retreating coastline, surface-water salinities on the outer shelf approached modern values of about 15–16 around 8.6 cal. ka. On the inner Laptev Sea shelf, modern-like environmental conditions were reached about 1 to 1.5 ky later, around 7.4 cal. ka, emphasizing the overwhelming influence of the global transgression on the Holocene evolution of Arctic shelf water masses.

Document Type: Article
Keywords: Arctic Siberia; Holocene river runoff; Diatoms; Aquatic palynomorphs; Land-ocean interaction
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.gloplacha.2004.12.014
ISSN: 0921-8181
Projects: Laptev Sea System, Permafrost
Date Deposited: 03 Dec 2008 16:52
Last Modified: 13 Sep 2017 09:21
URI: http://oceanrep.geomar.de/id/eprint/8064

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