DOI: 10.5194/cp-8-1621-2012
Scopus记录号: 2-s2.0-84875581702
论文题名: A 250 ka oxygen isotope record from diatoms at Lake El'gygytgyn, far east Russian Arctic
作者: Chapligin B. ; Meyer H. ; Swann G.E.A. ; Meyer-Jacob C. ; Hubberten H.-W.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 5 起始页码: 1621
结束页码: 1636
语种: 英语
Scopus关键词: air temperature
; arctic environment
; diatom
; glacial-interglacial cycle
; ice core
; isotopic composition
; lacustrine deposit
; Last Glacial Maximum
; marine isotope stage
; oxygen isotope
; sediment core
; silica
; Antarctica
; Arctic
; Chukchi
; Dome Concordia
; East Antarctica
; Elgygytgyn Lake
; Russian Federation
英文摘要: In 2003 sediment core Lz1024 was drilled at Lake El'gygytgyn, far east Russian Arctic, in an area of the Northern Hemisphere which has not been glaciated for the last 3.6 Ma. Biogenic silica was used for analysing the oxygen isotope composition (δ18Odiatom) in the upper 13 m long section dating back about 250 ka with samples dominated by one taxa in the <10 μm fraction (Cyclotella ocellata). Downcore variations in δ18O values show that glacial-interglacial cycles are present throughout the core and δ18Odiatom-values are mainly controlled by δ18Oprecipitation. Changes reflect the Holocene Thermal Maximum, the Last Glacial Maximum (LGM) and the interglacial periods corresponding to MIS 5.5 and MIS 7 with a peak-to-peak amplitude between LGM and MIS 5.5 of Δ18O = 5.3‰. This corresponds to a mean annual air temperature difference of about 9 °C. Our record is the first continuous δ18Odiatom record from an Arctic lake sediment core directly responding to precipitation and dating back more than 250 ka and correlates well with the stacked marine δ18O LR04 (r = 0.58) and δD EPICA Dome-C record (r = 0.69). With δ18O results indicating strong links to both marine and ice-core records, records from Lake El'gygytgyn can be used to further investigate the sensitivity of the Arctic climate to both past and future global climatic changes. © Author(s) 2012. 资助项目: DFG, Deutsche Forschungsgemeinschaft
; DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49549
Appears in Collections: 气候变化与战略
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Recommended Citation:
Chapligin B.,Meyer H.,Swann G.E.A.,et al. A 250 ka oxygen isotope record from diatoms at Lake El'gygytgyn, far east Russian Arctic[J]. Climate of the Past,2012-01-01,8(5)