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Unstable early-Holocene climatic and environmental conditions in northwestern Russia derived from a multidisciplinary study of a lake-sediment sequence from Pichozero, southeastern Russian Karelia

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-10691 Stockholm, Sweden; barbara{at}geo.su.se

Lorenz Schwark

Geological Institute, Köln University, Zuilpicherstr. 49, D-50674 Kiln, Germany

Ole Bennike

Geological Survey of Denmark and Greenland, 0ster Voldgade 10, DK-1350 Copenhagen K, Denmark

Ludmila Filimonova

Institute of Biology, Karelian Research Centre, RAS, Pushkinskaya 11, RU-185610 Petrozavodsk, Russia

Pavel Tarasov

Department of Geography, Moscow State University, Vorob'evy Gory, MGU, RU-119899 Moscow, Russia

Leif Björkmanj

Department of Quaternary Geology, Lund University, Tornavagen 13, SE-223 63 Lund, Sweden

Lars Brunnberg

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-10691 Stockholm, Sweden

Igor Demidov

Institute of Geology, Karelian Research Centre, RAS, Pushkinskaya 11, RU-185610 Petrozavodsk, Russia

Goran Possnert

Ångstrdm Laboratory, Uppsala University, Box 533, SE-75121 Uppsala, Sweden

A sediment core from Lake Pichozero (6146'; N, 3725'; E 118 m a.s.l.) provides information on the environmental and climatic conditions in southeastern Russian Karelia during the Lateglacial and early Holocene (12 800-9300 cal. BP). The chronology of the sequence is constrainied by varve counting and AMS ¹⁴C measurement of terrestrial plant macrofossils. Multiproxy analyses (magnetic susceptibility, grain size, TOC, TN, TS, Rock Eval, pollen and macrofossils) imply that cold and dry regional climatic conditions with sparse Arctic vegetation prevailed prior to 11500 cal. BP. Coincident with the transition to the Holocene at 11 500 cal. BP, air temperatures and lake productivity increased and Betula pubescens and Populus treinula started to migrate into the area, followed by Picea abies at 10 750 cal. BP. Although lake productivity decreased at around 11 000 cal. BP and remained low until 9600 cal. BP, pollen-based climate reconstructions imply variable climatic conditions in the region over time. Drier and colder summers prevailed from 11 200 to 10900 cal. BP, followed by an interval of higher annual temperatures and precipitation from 10900 to 10750 cal. BP. Lower annual temperatures and drier conditions existed from 10750 to 10200 cal. BP, and higher temperatures and precipitation are inferred between 10200 and 10000 cal. BP. Finally, declining temperatures and precipitation occurred from 10 000 cal. BP onwards, with a minimum at around 9600 cal. BP. These climatic shifts are temporally coincident with those recorded in North Atlantic terrestrial, marine and ice-core archives and indicate that relatively minor climate signals were transmitted further to the east.

Key Words: Northwestern Russia • Lateglacial • early Holocene • multiproxy study • palaeoenvironment • palaeoclimate • lacustrine sediments

The Holocene, Vol. 14, No. 5, 732-746 (2004)
DOI: 10.1191/0959683604hl751rp


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