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Implications of a 24,000-Yr Palynological Record for a Younger Dryas Cooling and for Boreal Forest Development in Northeastern Siberia

Published online by Cambridge University Press:  20 January 2017

Patricia M. Anderson ,
Anatoly V. Lozhkin  and
Linda B. Brubaker
Patricia M. Anderson
Affiliation:
Quaternary Research Center, University of Washington, Box 351360, Seattle, Washington, 98195-1360
Anatoly V. Lozhkin
Affiliation:
North East Interdisciplinary Research Institute, Far East Branch, Russian Academy of Sciences, 16 Portovaya St., 685000 Magadan, Russia
Linda B. Brubaker
Affiliation:
College of Forest Resources, Box 352100, University of Washington, Seattle, Washington, 98195-2100
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Abstract

A sediment core from Smorodinovoye Lake (SML), northeastern Siberia (area to the east of the Verkhoyansk Range) spanning the last 24,000 14C yr indicates that vegetational and climatic changes in the upper Indigirka basin resemble those in eastern Siberia (Lena basin and westward). For example, maximum postglacial summer temperatures at SML probably occurred 6000–4000 14C yr B.P., an age more in accordance with eastern than northeastern records. Larix arrived near the lake by 9600 14C yr B.P., approximately when forests expanded in the east but ca. 1500 14C yr later than forests were established in the neighboring upper Kolyma basin. Paleobotanical data further suggest that Larix possibly migrated southward from populations in the arctic lowlands of eastern Siberia and did not originate from interior refugia of the upper Kolyma basin. Although a Younger Dryas cooling has been noted in eastern Siberia, SML provides the first evidence from the northeast for a similar climatic reversal. Climatic variations seemingly have persisted between the Indigirka and Kolyma basins over at least the last 11,000 14C yr, despite the proximity of the two drainages and the occurrence of major changes in boundary conditions (e.g., seasonal insolation, sea levels) that have influenced other regional climatic patterns.

Keywords

Younger Dryasboreal forest historynortheastern SiberiaBeringiapaleoecologypollen
Type
Research Article
Information
Quaternary Research , Volume 57 , Issue 3 , May 2012 , pp. 325 - 333
Copyright
University of Washington

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