globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.09.027
论文题名:
Interplay between redox conditions and hydrological changes in sediments from Lake Nam Co (Tibetan Plateau) during the past 4000cal BP inferred from geochemical and micropaleontological analyses
作者: Kasper T.; Frenzel P.; Haberzettl T.; Schwarz A.; Daut G.; Meschner S.; Wang J.; Zhu L.; Mäusbacher R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392
起始页码: 261
结束页码: 271
语种: 英语
英文关键词: Diatoms (Bacillariophyta) ; Framboidal pyrite ; Monsoon ; Ostracoda ; Redox ; Tibetan Plateau
英文摘要: This study focuses on the analysis of lake sediments retrieved from the deepest part of Lake Nam Co (Tibetan Plateau). One gravity core of 115. cm length, covering the last ~. 4000. cal BP, was analyzed for geochemical and biological parameters. High organic content at ~. 4000. cal BP and the coinciding presence of pyrite framboids until ~. 2000. cal BP point to hampered decomposition of organic material due to anoxic conditions within the lake sediments. At the same time sedimentological and biological proxies suggest a rather high lake level, but still ~. 5. m below the recent one, with less saline lake water due to enhanced monsoonal activity. During this time a change in the source of organic matter to lowered input of terrestrial components is observed. A rather quick shift to a dry environment with less monsoonal influence and a lake level ~. 15. m lower than today at ~. 2000. cal BP lead to the oxygenation of sediment, the degradation of organic matter and the absence of pyrite. Oscillations of the lake level thereafter were of minor amplitude and not able to establish anoxia at the lake bottom again. A wet spell between ~. 1500. cal BP and ~. 1150. cal BP is visible in proxies referring to catchment hydrology and the ostracod-based water depth transfer function gives only a slightly elevated lake level. The last ~. 300. years are characterized by low TOC and rising TN values reflecting enhanced nutrient supply and hence an advancing influence of human activity in the catchment. Decreasing TOC/TN values point to a complete shift to almost solely aquatic biomass production. These results show that hydrological variations in terms of lake level change based on monsoonal strength can be linked to redox conditions at the lake bottom of Nam Co. Comparison with other archives over larger parts of the Tibetan Plateau and beyond exhibits a rather homogeneous climatic pattern throughout the late Holocene. © 2013 Elsevier B.V.
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被引频次[WOS]:34   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69537
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作者单位: Friedrich-Schiller-University Jena, Institute of Geography, Department of Physical Geography, Loebdergraben 32, 07743 Jena, Germany; Friedrich-Schiller-University Jena, Institute of Geosciences, Burgweg 11, 07749 Jena, Germany; Technische Universität Braunschweig, Institut für Geosysteme und Bioindikation, Langer Kamp 19c, 38106 Braunschweig, Germany; Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China

Recommended Citation:
Kasper T.,Frenzel P.,Haberzettl T.,et al. Interplay between redox conditions and hydrological changes in sediments from Lake Nam Co (Tibetan Plateau) during the past 4000cal BP inferred from geochemical and micropaleontological analyses[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392
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