Title Late glacial to Holocene environments in the present-day coldest region of the Northern Hemisphere inferred from a pollen record of Lake Billyakh, Verkhoyansk Mts, NE Siberia
Author Müller, S.; Tarasov, P.E.; Andreev, A.A.; Diekmann, B.
Author Affil Müller, S., Freie Universität Berlin, Geologische Wissenschaften, Berlin, Federal Republic of Germany. Other: Alfred- Wegener-Institut fur Polar- und Meeresforschung, Federal Republic of Germany
Source Climate of the Past, 5(1), p.73-84, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814- 9324
Publication Date 2009
Notes In English. Includes appendix and supplement: http://www.clim- past.net/5/73/2009/cp-5-73-2009- supplement.xls; part of special issue no. 18, Data/model interactions; the biological perspective of understanding past global changes, edited by Rousseau, D. D. et al., http://www.clim- past.net/special_issue18.html; published in Climate of the Past Discussion, 26 November 2008, http://www.clim-past- discuss.net/4/1237/2008/cpd-4-1237-2008.html; accessed in November, 2009. 55 refs. CRREL Acc. No: 64001773
Index Terms carbon isotopes; climatic change; ice; isotopes; lakes; lake ice; paleoclimatology; Pleistocene; pollen; radioactive isotopes; taiga; trees (plants); tundra; vegetation; Asia--Siberia; Steppes region; Russia-- Verkhoyansk Range; Allerod; Angiospermae; arid environment; Asia; Betula; Bolling; C- 14; carbon; Cenozoic; climate change; Commonwealth of Independent States; Coniferales; Dicotyledoneae; Dryas; glacial environment; Gymnospermae; Holocene; International Polar Year 2007-08; IPY 2007-08 Research Publications; Lake Billyakh; late- glacial environment; microfossils; miospores; paleoenvironment; palynomorphs; Pinaceae; Pinus; Pinus pumila; Pinus sylvestris; Plantae; Quaternary; Russian Federation; Siberia; Spermatophyta; taiga environment; terrestrial environment; trees; upper Pleistocene; upper Weichselian; Verkhoyansk Range; Weichselian; Yakutia Russian Federation
Abstract In this study, a radiocarbon-dated pollen record from Lake Billyakh (65°17'N, 126°47'E; 340 m a.s.l.) in the Verkhoyansk Mountains was used to reconstruct vegetation and climate change since about 15 kyr BP. The pollen record and pollen-based biome reconstruction suggest that open cool steppe (STEP) and grass and sedge tundra (TUND) communities with Poaceae, Cyperaceae, Artemisia, Chenopodiaceae, Caryophyllaceae and Selaginella rupestris dominated the area from 15 to 13.5 kyr BP. On the other hand, the constant presence of Larix pollen in quantities comparable to today's values points to the constant presence of boreal deciduous conifer (CLDE) trees in the regional vegetation during the Late Glacial. A major spread of shrub tundra communities, including birch (Betula sect. Nanae), alder (Duschekia fruticosa) and willow (Salix) species, is dated to 13.5-12.7 kyr BP, indicating a noticeable increase in precipitation toward the end of the Last Glaciation, particularly during the Bolling- Allerod Interstadial. Between 12.7 and 11.4 kyr BP pollen percentages of herbaceous taxa rapidly increased, whereas shrub taxa percentages decreased, suggesting strengthening of the steppe communities associated with the relatively cold and dry Younger Dryas Stadial. However, the pollen data in hand indicate that Younger Dryas climate was less severe than the climate during the earlier interval from 15 to 13.5 kyr BP. The onset of the Holocene is marked in the pollen record by the highest values of shrub and lowest values of herbaceous taxa, suggesting a return of warmer and wetter conditions after 11.4 kyr BP. Percentages of tree taxa increase gradually and reach maximum values after 7 kyr BP, reflecting the spread of boreal cold deciduous and taiga forests in the region. An interval between 7 and 2 kyr BP is noticeable for the highest percentages of Scots pine (Pinus subgen. Diploxylon), spruce (Picea) and fir (Abies) pollen, indicating mid-Holocene spread of boreal forest communities in response to climate amelioration and degradation of the permafrost layer.
URL http://www.clim-past.net/5/73/2009/cp-5-73-2009.pdf
Publication Type journal article
Record ID 296654