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学科主题: 地理学::自然地理学
题名: Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau
作者: Witt, R (Witt, Roman)1; Gunther, F (Guenther, Franziska)1; Lauterbach, S (Lauterbach, Stefan)2; Kasper, T (Kasper, Thomas)3; Mausbacher, R (Maeusbacher, Roland)3; Yao, TD (Yao, Tandong)4; Gleixner, G (Gleixner, Gerd)1
通讯作者: Gleixner, G
刊名: JOURNAL OF PALEOLIMNOLOGY
发表日期: 2016
DOI: 10.1007/s10933-015-9863-1
卷: 55, 期:1, 页:67-82
收录类别: SCI
合作性质: 国际
文章类型: Article
英文摘要: Improved knowledge of deglaciation processes during the termination of the Last Glacial Maximum on the Tibetan Plateau can provide important information for understanding deglaciations in climate-sensitive high-altitude ecosystems. Little, however, is known about this time interval because most lacustrine sediment records from the Tibetan Plateau are younger than 19,000 years. This study focused on a lake sediment record from Nam Co, south-central Tibetan Plateau, covering the interval from similar to 23.7 to 20.9 cal ka BP. We analysed the distribution and compound-specific hydrogen isotope composition (delta D) of sedimentary n-alkanes, as well as the bulk sediment TOC, TN, delta C-13(org) and delta N-15 composition, to infer lake system development. Pronounced changes in environmental conditions between similar to 21.6 and 21.1 cal ka BP, as well as between 23.1 and 22.5 cal ka BP (Greenland Interstadial 2), were inferred from increased aquatic n-alkane amounts and decreased delta D (n-C23) values within these time intervals, respectively. Freshwater inputs, which most likely resulted from enhanced glacier melting, caused these changes. Our results suggest that mountain glacier retreat on the Tibetan Plateau started earlier than previously assumed. The required energy for thawing was probably provided by temperature changes caused by reorganization of atmospheric circulation, which has also been recorded in Greenland ice records.
语种: 英语
WOS记录号: WOS:000368638900005
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7883
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Max Planck Inst Biogeochem, Hans Knoll Str 10, D-07745 Jena, Germany
2.GFZ German Res Ctr Geosci, Sect Climate Dynam & Landscape Evolut 5 2, D-14473 Potsdam, Germany
3.Friedrich Schiller Univ, D-07747 Jena, Germany
4.Chinese Acad Sci, TEL Inst Tibetan Plateau Res, Beijing 100085, Peoples R China

Recommended Citation:
Witt, R ,Gunther, F ,Lauterbach, S ,et al. Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau[J]. JOURNAL OF PALEOLIMNOLOGY,2016,55(1):67-82.
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文件名: V.55(1) 67-82 2016.pdf
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