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Paleoclimate changes of the last 1000 yr on the eastern Qinghai-Tibetan Plateau recorded by elemental, isotopic, and molecular organic matter proxies in sediment from glacial Lake Ximencuo

文献类型：期刊论文

作者Pu, Yang1; Nace, Trevor2; Meyers, Philip A.3; Zhang, Hucai4; Wang, Yongli5; Zhang, Chuanlun L.6; Shao, Xiaohua1
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2013-06-01
卷号379页码:39-53
关键词Biomarker n-Alkane n-Alkan-ol Organic carbon and nitrogen isotopes Qinghai-Tibetan Plateau Suess Effect
ISSN号0031-0182
DOI10.1016/j.palaeo.2013.03.023
文献子类Article
英文摘要Total organic carbon (C-org) and nitrogen (N-tot) concentrations and isotope compositions and n-alkane and n-alkan-ol molecular biomarker compositions were measured in two parallel sediment cores from Lake Ximencuo, a typical glacial lake on the eastern Qinghai-Tibetan Plateau (QTP), to reconstruct local climatic variations during the past 1000 yr. Concentrations of C-org and N-tot vary similarly with changes in precipitation recorded by tree rings in Dulan, northeastern QTP, indicating their close relation to precipitation. Carbon Preference Index (CPI) values of C-22-C-33 n-alkanes and C-22-C-28 n-alkan-1-ols and Average Chain Length (ACL) values of C-27-C-33 n-alkanes generally negatively correlate with delta C-13(org) and delta N-15(tot) and also vary comparably with the oxygen isotope temperature record from the Dunde ice core, northeastern QTP. These patterns indicate that high CPI values and negative shifts of the delta C-13(org) and delta N-15(tot) correspond to warmer conditions that favor the growth of vascular land plants and that lower values and positive shifts correspond to cooler conditions in the Lake Ximencuo locality. This observation contradicts previous interpretations from peat and modern soil studies that conclude that the CPI indices were controlled by microbial degradation under different climate conditions. Here we propose that the changes of organic matter sources under different climate regimes, combined with physiological adjustments of vascular plants to different air temperatures, might yield different CPI responses to climate changes in glacial plateau lakes. Air temperature and precipitation increases and decreases reconstructed in this 1000-yr study were generally independent of each other, but they both occurred at centennial or multi-centennial scales. The interaction between subtropical (Asian Monsoon) and mid-latitude (Westerly) atmospheric circulation systems probably dominated the local precipitation variations in the Lake Ximencuo catchment, whereas solar insolation, volcanism and greenhouse gas variations were likely responsible for the air temperature changes that are recorded in the lake sediments and that are consistent with regional temperature variations in the eastern QTP. (C) 2013 Elsevier B.V. All rights reserved.
WOS关键词ICE-CORE RECORD ; N-ALKANES ; ENVIRONMENTAL-CHANGES ; CLIMATE CHANGES ; NAM-CO ; NIANBAOYEZE MOUNTAINS ; GEOCHEMICAL RECORDS ; PAST MILLENNIUM ; ASIAN MONSOON ; HIGHER-PLANTS
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
WOS记录号WOS:000320218600004
出版者ELSEVIER SCIENCE BV
资助机构Major State Basic Research Development Program of China(2012CB214701) ; Major State Basic Research Development Program of China(2012CB214701) ; Chinese Academy of Sciences(XDB03020405) ; Chinese Academy of Sciences(XDB03020405) ; National Natural Science Foundation of China(40871096) ; National Natural Science Foundation of China(40871096) ; Major State Basic Research Development Program of China(2012CB214701) ; Major State Basic Research Development Program of China(2012CB214701) ; Chinese Academy of Sciences(XDB03020405) ; Chinese Academy of Sciences(XDB03020405) ; National Natural Science Foundation of China(40871096) ; National Natural Science Foundation of China(40871096) ; Major State Basic Research Development Program of China(2012CB214701) ; Major State Basic Research Development Program of China(2012CB214701) ; Chinese Academy of Sciences(XDB03020405) ; Chinese Academy of Sciences(XDB03020405) ; National Natural Science Foundation of China(40871096) ; National Natural Science Foundation of China(40871096) ; Major State Basic Research Development Program of China(2012CB214701) ; Major State Basic Research Development Program of China(2012CB214701) ; Chinese Academy of Sciences(XDB03020405) ; Chinese Academy of Sciences(XDB03020405) ; National Natural Science Foundation of China(40871096) ; National Natural Science Foundation of China(40871096)
源URL[http://ir.iggcas.ac.cn/handle/132A11/87724]  
专题中国科学院地质与地球物理研究所
通讯作者Pu, Yang
作者单位1.Nanjing Univ Informat Sci & Technol, Sch Remote Sensing, Nanjing 210044, Jiangsu, Peoples R China
2.Duke Univ, Div Earth & Ocean Sci, Durham, NC 27708 USA
3.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA
4.Yunnan Normal Univ, Key Lab Plateau Lake Ecol & Global Change, Kunming Chenggong 650500, Peoples R China
5.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Lanzhou 730000, Peoples R China
6.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA
推荐引用方式
GB/T 7714		 Pu, Yang,Nace, Trevor,Meyers, Philip A.,et al. Paleoclimate changes of the last 1000 yr on the eastern Qinghai-Tibetan Plateau recorded by elemental, isotopic, and molecular organic matter proxies in sediment from glacial Lake Ximencuo[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2013,379:39-53.
APA Pu, Yang.,Nace, Trevor.,Meyers, Philip A..,Zhang, Hucai.,Wang, Yongli.,...&Shao, Xiaohua.(2013).Paleoclimate changes of the last 1000 yr on the eastern Qinghai-Tibetan Plateau recorded by elemental, isotopic, and molecular organic matter proxies in sediment from glacial Lake Ximencuo.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,379,39-53.
MLA Pu, Yang,et al."Paleoclimate changes of the last 1000 yr on the eastern Qinghai-Tibetan Plateau recorded by elemental, isotopic, and molecular organic matter proxies in sediment from glacial Lake Ximencuo".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 379(2013):39-53.

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来源：地质与地球物理研究所

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