Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater
-
Published:2012-08-17
Issue:4
Volume:8
Page:1287-1300
-
ISSN:1814-9332
-
Container-title:Climate of the Past
-
language:en
-
Short-container-title:Clim. Past
Author:
Andreev A. A.,Morozova E.,Fedorov G.,Schirrmeister L.,Bobrov A. A.,Kienast F.,Schwamborn G.
Abstract
Abstract. Frozen sediments from three cores bored in the permafrost surrounding the El'gygytgyn Impact Crater Lake have been studied for pollen, non-pollen palynomorphs, plant macrofossils and rhizopods. The palynological study of these cores contributes to a higher resolution of time intervals presented in a poor temporal resolution in the lacustrine sediments; namely the Allerød and succeeding periods. Moreover, the permafrost records better reflect local environmental changes, allowing a more reliable reconstruction of the local paleoenvironments. The new data confirm that shrub tundra with dwarf birch, shrub alder and willow dominated the lake surroundings during the Allerød warming. Younger Dryas pollen assemblages reflect abrupt changes to grass-sedge-herb dominated environments reflecting significantly drier and cooler climate. Low shrub tundra with dwarf birch and willow dominate the lake vicinity at the onset of the Holocene. The find of larch seeds indicate its local presence around 11 000 cal yr BP and, thus a northward shift of treeline by about 100 km during the early Holocene thermal optimum. Forest tundra with larch and shrub alder stands grew in the area during the early Holocene. After ca. 3500 cal yr BP similar-to-modern plant communities became common in the lake vicinity.
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
Reference55 articles.
1. Anderson, P. M. and Lozhkin, A. V. (Eds.): Palynological and radiocarbon data from Quaternary deposits of northeastern Siberia, in: Quaternary vegetation and climate of Siberia and Russian Far East: a palynological and radiocarbon database, NOAA Paleoclimatology and North-East Science Center, Magadan, 27–34, 2002. 2. Anderson, P. M., Lozhkin, A. V., and Brubaker, L. B.: Implications of a 24,000-yr palynological record for a Younger Dryas cooling and for boreal forest development in Northeastern Siberia, Quatern. Res., 57, 325–333, 2002. 3. Andreev, A. A., Grosse, G., Schirrmeister, L., Kuznetsova, T. V., Kuzmina, S. A., Bobrov, A. A., Tarasov, P. E., Novenko, E. Yu., Meyer, H., Derevyagin, A. Yu., Kienast, F., Bryantseva, A., and Kunitsky, V. V.: Weichselian and Holocene paleoenvironmental history of the Bol'shoy Lyakhovsky Island, New Siberian Archipelago, Arctic Siberia, Boreas, 38, 72–110, 2009. 4. Andreev, A., Schirrmeister, L., Tarasov, P., Ganopolski, A., Brovkin, V., Siegert, C., and Hubberten, H.-W.: Vegetation and climate history in the Laptev Sea region (arctic Siberia) during Late Quaternary inferred from pollen records, Quaternary Sci. Rev., 30, 2182–2199, 2011. 5. Belikovich, A. V.: Permanent monitoring in the El'gygytgyn Lake area, IBPS FEB RAS, Magadan, 1988.
Cited by
37 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|