DOI: 10.1016/j.quascirev.2013.02.025
Scopus记录号: 2-s2.0-84876342641
论文题名: The onset of Neoglaciation 6000 years ago in western Mongolia revealed by an ice core from the Tsambagarav mountain range
作者: Herren P.-A. ; Eichler A. ; Machguth H. ; Papina T. ; Tobler L. ; Zapf A. ; Schwikowski M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 69 起始页码: 59
结束页码: 68
语种: 英语
英文关键词: Climate
; Holocene
; Ice core
; Mongolian Altai
; Neoglaciation
; Radiocarbon
Scopus关键词: Climate
; Holocenes
; Ice core
; Mongolians
; Neoglaciation
; Radiocarbon
; Glacial geology
; Landforms
; Lasers
; Ice
; basal ice
; bedrock
; equilibrium line
; glacier flow
; Hypsithermal
; ice cap
; ice core
; lacustrine deposit
; Last Glacial Maximum
; low temperature
; Neoglacial
; paleoclimate
; paleoenvironment
; precipitation (climatology)
; radiocarbon dating
; reconstruction
; topography
; Altai Mountains
; Mongolia
英文摘要: Glacier highstands since the Last Glacial Maximum are well documented for many regions, but little is known about glacier fluctuations and lowstands during the Holocene. This is because the traces of minimum extents are difficult to identify and at many places are still ice covered, limiting the access to sample material. Here we report a new approach to assess minimal glacier extent, using a 72-m long surface-to-bedrock ice core drilled on Khukh Nuru Uul, a glacier in the Tsambagarav mountain range of the Mongolian Altai (4130masl, 48°39.338'N, 90°50.826'E). The small ice cap has low ice temperatures and flat bedrock topography at the drill site. This indicates minimal lateral glacier flow and thereby preserved climate signals. The upper two-thirds of the ice core contain 200 years of climate information with annual resolution, whereas the lower third is subject to strong thinning of the annual layers with a basal ice age of approximately 6000 years before present (BP). We interpret the basal ice age as indicative of ice-free conditions in the Tsambagarav mountain range at 4100masl prior to 6000 years BP. This age marks the onset of the Neoglaciation and the end of the Holocene Climate Optimum. The ice-free conditions allow for adjusting the Equilibrium Line Altitude (ELA) and derive the glacier extent in the Mongolian Altai during the Holocene Climate Optimum. Based on the ELA-shift, we conclude that most of the glaciers are not remnants of the Last Glacial Maximum but were formed during the second part of the Holocene. The ice core derived accumulation reconstruction suggests important changes in the precipitation pattern over the last 6000 years. During formation of the glacier, more humid conditions than presently prevailed followed by a long dry period from 5000 years BP until 250 years ago. Present conditions are more humid than during the past millennia. This is consistent with precipitation evolution derived from lake sediment studies in the Altai. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60649
Appears in Collections: 过去全球变化的重建
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作者单位: Paul Scherrer Institut, 5232 Villigen PSI, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland; Glaciology and Geomorphodynamics, University of Zürich, 8057 Zürich, Switzerland; Geological Survey of Denmark and Greenland, 1350 Copenhagen, Denmark; Institute for Water and Environmental Problems, 656038 Barnaul, Russian Federation; Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland
Recommended Citation:
Herren P.-A.,Eichler A.,Machguth H.,et al. The onset of Neoglaciation 6000 years ago in western Mongolia revealed by an ice core from the Tsambagarav mountain range[J]. Quaternary Science Reviews,2013-01-01,69