DOI: 10.1016/j.quascirev.2013.10.008
Scopus记录号: 2-s2.0-84900401043
论文题名: Glacial and vegetation history of the Polar Ural Mountains in northern Russia during the Last Ice Age, Marine Isotope Stages 5-2
作者: Svendsen J.I. ; Krüger L.C. ; Mangerud J. ; Astakhov V.I. ; Paus A. ; Nazarov D. ; Murray A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 409
结束页码: 428
语种: 英语
英文关键词: Arctic Russia
; Barents-Kara Ice Sheet
; Glaciation
; Ice cap
; Ice-dammed lakes
; Lake cores
; OSL chronology
; Paleoclimate
; Pollen stratigraphy
; Ural Mountains
Scopus关键词: Forestry
; Glacial geology
; Glaciers
; Ice
; Isotopes
; Landforms
; Luminescence
; Snow
; Stratigraphy
; Vegetation
; Arctic Russia
; Glaciation
; Ice sheet
; Ice-caps
; Ice-dammed lake
; OSL chronology
; Paleoclimates
; Ural Mountains
; Lakes
; coniferous tree
; dating method
; deciduous tree
; glacial history
; glaciation
; Holocene
; ice cap
; ice sheet
; ice-dammed lake
; lacustrine deposit
; marine isotope stage
; paleoclimate
; paleotemperature
; plant community
; Pleistocene
; polar region
; reconstruction
; sediment core
; stratigraphy
; till
; tundra
; vegetation history
; Betula
; Geology
; Ice
; Lakes
; Mountains
; Plants
; Russia
; Salix
; Sediments
; Russian Federation
; Urals
; Betula
; Picea
; Salix
英文摘要: We describe and discuss the glacial and climate variations in the Polar Ural Mountains in northern Russia over the last 100000 years. A series of optically stimulated luminescence (OSL) and radiocarbon ages from sediment cores demonstrate that there has been continuous deposition of lacustrine sediments throughout the last 65ka in Lake Gerdizty, a lake basin situated on the eastern foothills of the Urals. Below the lacustrine sequence are two till beds; the uppermost (unit B) was probably deposited by a large mountain-centred glacier complex that covered the lake basin during Marine Isotope Stage (MIS) 4. This till bed might be a counterpart of the Usa Moraine in the western foothills of the Polar Urals, which is dated with OSL- and 10Be cosmogenic nuclide methods to between 68 and 58ka, consistent with the OSL ages from the lowermost lacustrine sediments in Lake Gerdizty. During this glaciation some of the northern Uralian outlet glaciers probably merged with the adjacent Barents-Kara Ice Sheet that reached onto the adjacent lowlands forming large ice-dammed lakes on both sides of the Ural Mountains. The equilibrium line altitude (ELA) on the local ice cap was then at least 1200m lower than at present. The pollen stratigraphy in Lake Gerditzy reflects an open tundra and steppe-like vegetation throughout MIS 3-2 (60-11,7ka). The first significant change in vegetation, shown by an increase of dwarf-shrub communities of Salix and Betula, took place during the Lateglacial at around 15ka or shortly after. Birch and spruce trees approached the area for the first time soon after the Holocene transition ~11.7ka, and became dominant elements in the vegetation after a few hundred years. Our reconstruction suggests a very cold summer climate during MIS 4 and presumably also during the preceding MIS 5b (95-85ka) glaciation, probably amplified by the large ice-dammed lakes that existed during these two glaciations. A somewhat milder climate prevailed during MIS 3 (60-25ka), but a treeless vegetation nevertheless suggests that mean summer temperatures did not exceed 10-12°C before the earliest Holocene. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60305
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Science, University of Bergen, P.O. Box 7803, N-5020 Bergen, Norway; Bjerknes Centre for Climate Research, University of Bergen, P.O. Box 7810, 5020 Bergen, Norway; Department of Biology, University of Bergen, P.O. Box 7803, 5020 Bergen, Norway; St.Petersburg State University, Geological Faculty, Universitetskaya 7/9, 199034 St. Petersburg, Russian Federation; The Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, DK-4000 Roskilde, Denmark
Recommended Citation:
Svendsen J.I.,Krüger L.C.,Mangerud J.,et al. Glacial and vegetation history of the Polar Ural Mountains in northern Russia during the Last Ice Age, Marine Isotope Stages 5-2[J]. Quaternary Science Reviews,2014-01-01,92