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题名: Implications of diverse sedimentation patterns in Hala Lake, Qinghai Province, China for reconstructing Late Quaternary climate
作者: Wunnemann, B; Wagner, J; Zhang, YZ; Yan, DD; Wang, R; Shen, Y; Fang, XY; Zhang, JW(张家武)
收录类别: SCIE
出版日期: 2012-12
刊名: JOURNAL OF PALEOLIMNOLOGY
卷号: 48, 期号:4, 页码:725-749
英文摘要: Hala Lake is located in the Qilian Mountains, Qinghai Province, China, at 4,078 m a.s.l. Its sediments contain an archive of climate and hydrologic changes during the Late Quaternary, as it is located close to the area influenced by the East-Asian summer monsoon and westerly-driven air masses. Sedimentation patterns and depositional conditions within the lake were investigated using eight sediment cores from different water depths, and this information was used to evaluate the feasibility of using a single core to reconstruct past climate and hydrological conditions. Long core H7, from the center of the lake (65 m water depth) and core H8 from a western, near-shore location (20 m water depth), were compared in detail using sediment composition and geochemical data (X-ray fluorescence, loss-on-ignition and CNS analysis). Age models were constructed using 17 AMS radiocarbon dates and indicate negligible reservoir error for sediments from the lake center and similar to 1,000 year errors for the near-shore sediment core. Cores H1-H5 and HHLS21-1 revealed a sediment succession from sand and silty clay to laminated clay on the southern side of the lake. Undisturbed, finely laminated sediments were found at water depths a parts per thousand yen15 m. Core H5 (2.5 m long), from 31 m water depth, yielded abundant green algal mats mixed with clayey lake deposits and was difficult to interpret. Algae occurred between 25 and 32 m water depth and influenced the dissolved oxygen content of the stratified lake. Comparison of cores H7 and H8 yielded prominent mismatches for different time periods, which may, in part, be attributed to internal lacustrine processes, independent of climate influence. We thus conclude that data from a single sediment core may lead to different climate inferences. Common shifts among proxy data, however, showed that major climate shifts, of regional to global significance, can be tracked and allow reconstruction of lake level changes over the last 24,000 years. Results indicate advance of glaciers into the lake basin during the LGM, at which time the lake experienced lowest levels, 25-50 m below present stage. Stepwise refilling began at ca. 16 kyr BP and reached the -25 m level during the Bolling/Allerod warm phase, ca. 13.5 kyr BP. A desiccation episode falls within the Younger Dryas, followed by a substantial lake level rise during the first millennium of the Holocene, a result of climate warming, which promoted glacier melt. By ca. 7.6 kyr BP, the lake reached a stable high stand similar to the present level, which persisted until ca. 6 kyr BP. Disturbed sediments in core H7 indicate a single mass flow that was most likely triggered by a major seismic event similar to 8.5 kyr BP. Subsequent lake development remains unclear as a consequence of data mismatches, but may indicate a general trend to deteriorating conditions and lake level lowstands at ca. 5.0-4.2, 2.0 and 0.5 kyr BP.
关键词: Tibetan Plateau ; Lake sediments ; Carbonates ; Paleohydrology ; Paleoclimate
作者部门: [Wuennemann, Bernd ; Zhang, Yongzhan ; Yan, Dada ; Wang, Rong ; Fang, Xiaoyu] Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing, Jiangsu, Peoples R China ; [Wuennemann, Bernd ; Shen, Yan] Free Univ Berlin, Inst Geog Sci, Berlin, Germany ; [Wagner, Johannes] Tech Univ Berlin, Inst Mineral, Berlin, Germany ; [Zhang, Jiawu] Lanzhou Univ, MOE Key Lab Western Chinas Environm Syst Res, Sch Arid Environm & Climate Change, Lanzhou 730000, Peoples R China
通讯作者: Wunnemann, B (reprint author), Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing, Jiangsu, Peoples R China.
学科分类: Environmental Sciences & Ecology; Geology; Marine & Freshwater Biology
文章类型: Article
所属项目编号: NSFC [21000801-321-25]
所属项目名称: 国家自然科学基金项目
项目资助者: NSFC
语种: 英语
DOI: 10.1007/s10933-012-9641-2
ISSN号: 0921-2728
WOS记录号: WOS:000311395000005
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120221
Appears in Collections:资源环境学院_期刊论文

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