Universität zu Köln

Andren, Elinor, Klimaschewski, Andrea, Self, Angela E., Amour, Natalie St., Andreev, Andrei A., Bennett, Keith D., Conley, Daniel J., Edwards, Thomas W. D., Solovieva, Nadia ORCID: 0000-0002-8978-9057 and Hammarlund, Dan ORCID: 0000-0001-7147-8173 (2015). Holocene climate and environmental change in north-eastern Kamchatka (Russian Far East), inferred from a multi-proxy study of lake sediments. Glob. Planet. Change, 134. S. 41 - 55. AMSTERDAM: ELSEVIER. ISSN 1872-6364

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Abstract

A sediment record from a small lake in the north-eastern part of the Kamchatka Peninsula has been investigated in a multi-proxy study to gain knowledge of Holocene climatic and environmental change. Pollen, diatoms, chironomids and selected geochemical parameters were analysed and the sediment record was dated with radiocarbon. The study shows Holocene changes in the terrestrial vegetation as well as responses of the lake ecosystern to catchment maturity and multiple stressors, such as climate change and volcanic eruptions. Climate change is the major driving force resulting in the recorded environmental changes in the lake, although recurrent tephra deposition events also contributed. The sediment record has an age at the base of about 10,000 cal yrs BP, and during the first 400 years the climate was cold and the lake exhibited extensive ice-cover during winter and relatively low primary production. Soils in the catchment were poor with shrub alder and birches dominating the vegetation surrounding the lake. At about 9600-8900 cal yrs BP the climate was cold and moist, and strong seasonal wind stress resulted in reduced ice-cover and increased primary production. After ca. 8900 cal yrs BP the forest density increased around the lake, runoff decreased in a generally drier climate resulting in decreased primary production in the lake until ca. 7000 cal yrs BP. This generally dry climate was interrupted by a brief climatic perturbation, possibly attributed to the 8.2 ka event, indicating increasingly windy conditions with thick snow cover, reduced ice-cover and slightly elevated primary production in the lake. The diatom record shows maximum thermal stratification at ca. 6300-5800 cal yrs BP and indicates together with the geochemical proxies a dry and slightly warmer climate resulting in a high productive lake. The most remarkably change in the catchment vegetation occurred at ca. 4200 cal yrs BP in the form of a conspicuous increase in Siberian dwarf pine (Pinus pumila), indicating a shift to a cooler climate with a thicker and more long-lasting snow cover. This vegetational change was accompanied by marked shifts in the diatom and chironomid stratigraphies, which are also indicative of colder climate and more extensive ice-cover. (C) 2015 The Authors. Published by Elsevier B.V.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Andren, Elinor UNSPECIFIED UNSPECIFIED UNSPECIFIED Klimaschewski, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Self, Angela E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Amour, Natalie St. UNSPECIFIED UNSPECIFIED UNSPECIFIED Andreev, Andrei A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bennett, Keith D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Conley, Daniel J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Edwards, Thomas W. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Solovieva, Nadia UNSPECIFIED orcid.org/0000-0002-8978-9057 UNSPECIFIED Hammarlund, Dan UNSPECIFIED orcid.org/0000-0001-7147-8173 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-388709
DOI:	10.1016/j.gloplacha.2015.02.013
Journal or Publication Title:	Glob. Planet. Change
Volume:	134
Page Range:	S. 41 - 55
Date:	2015
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-6364
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TEPHRA DEPOSITION; SOUTHERN SWEDEN; COLD EVENT; DIATOM; POLLEN; TEMPERATURE; VEGETATION; DIPTERA; PACIFIC; RECORD Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38870