Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau

doi:10.1007/s10933-015-9863-1

	Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau
	Gunther, F (Guenther, Franziska)1; Gleixner, G ; Gleixner, G (Gleixner, Gerd)1; Yao, TD (Yao, Tandong)3; Mausbacher, R (Maeusbacher, Roland)4; Kasper, T (Kasper, Thomas)4; Witt, R (Witt, Roman)1; Lauterbach, S (Lauterbach, Stefan)2
刊名	JOURNAL OF PALEOLIMNOLOGY
	2016
卷号	55 期号:1 页码:67-82
关键词	Delta-d Values Guliya Ice Core N-alkanes Isotope Ratios Hydrological Changes Holocene Vegetation Climatic Changes Carbon-number Indian-ocean Lacustrine
DOI	10.1007/s10933-015-9863-1
文献子类	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.
学科主题	自然地理学
语种	英语
WOS记录号	WOS:000368638900005
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7883]
专题	青藏高原研究所_图书馆
通讯作者	Gleixner, G
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.Chinese Acad Sci, TEL Inst Tibetan Plateau Res, Beijing 100085, Peoples R China 4.Friedrich Schiller Univ, D-07747 Jena, Germany
推荐引用方式 GB/T 7714	Gunther, F ,Gleixner, G,Gleixner, G ,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.
APA	Gunther, F .,Gleixner, G.,Gleixner, G .,Yao, TD .,Mausbacher, R .,...&Lauterbach, S .(2016).Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau.JOURNAL OF PALEOLIMNOLOGY,55(1),67-82.
MLA	Gunther, F ,et al."Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau".JOURNAL OF PALEOLIMNOLOGY 55.1(2016):67-82.