DOI: 10.1016/j.quascirev.2014.07.001
Scopus记录号: 2-s2.0-84909598325
论文题名: Dynamics of the last four glacial terminations recorded in Lake Van, Turkey
作者: Kwiecien O. ; Stockhecke M. ; Pickarski N. ; Heumann G. ; Litt T. ; Sturm M. ; Anselmetti F. ; Kipfer R. ; Haug G.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 104 起始页码: 42
结束页码: 52
语种: 英语
英文关键词: Eastern Mediterranean
; Glacial/interglacial cycle
; Lake Van
; Multi-proxy approach
; Oxygen isotopes
; Termination
Scopus关键词: Eastern Mediterranean
; Glacial/interglacial cycle
; Lake vans
; Multi proxies
; Oxygen isotopes
; Termination
; anoxia
; carbonate
; epilimnion
; glacial environment
; glacial-interglacial cycle
; isotopic composition
; lithology
; numerical model
; oxygen isotope
; paleoclimate
; proxy climate record
; rainfall
; runoff
; snowmelt
; Anatolia
; Lake Van
; Mediterranean Sea
; Mediterranean Sea (East)
; Turkey
英文摘要: A well-dated suite of Lake Van climate-proxy data covering the last 360ka documents environmental changes over 4 glacial/interglacial cycles in Eastern Anatolia, Turkey. The picture of cold and dry glacials and warm and wet interglacials emerging from pollen, organic carbon, authigenic carbonate content, elemental profiling by XRF and lithological analyses is inconsistent with classical interpretation of oxygen isotopic composition of carbonates pointing to a more complex pattern in Lake Van region. Detailed analysis of glacial terminations allows for the constraining of a depositional model explaining different patterns observed in all the proxies. We hypothesize that variations in relative contribution of rainfall, snowmelt and glacier meltwater recharging the basin have a very important role for all sedimentary processes in Lake Van. Lake level of glacial Lake Van, predominantly fed by snowmelt, was low, the water column was oxic, and carbonates precipitating in the epilimnion recorded the light isotopic signature of inflow. During terminations, increasing rainfall and significant supply of mountain glaciers' meltwater contributed to lake level rise. Increased rainfall enhanced density gradients in the water column, and hindered mixing leading to development of bottom-water anoxia. Carbonates precipitating during terminations show large fluctuations in their isotopic composition. Full interglacial conditions in Lake Van are characterized by high or slowly falling lake level. Rainfall and snowmelt feed the lake but due tore-established mixing, the isotopic composition of authigenic carbonates is heavier and closer to that of evaporation-influenced lake water than that of runoff representing snowmelt and atmospheric precipitation. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60127
Appears in Collections: 过去全球变化的重建
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作者单位: ETH Zurich, Climate Geology, Sonneggstrasse 5, Zurich, Switzerland; Eawag Dubendorf, Ueberlandstrasse 130, Duebendorf, Switzerland; Steinmann Institute of Geology, Mineralogy and Paleontology, Bonn University, Nussallee 8, Bonn, Germany; Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Baltzerstrasse 1-3, Bern, Switzerland
Recommended Citation:
Kwiecien O.,Stockhecke M.,Pickarski N.,et al. Dynamics of the last four glacial terminations recorded in Lake Van, Turkey[J]. Quaternary Science Reviews,2014-01-01,104