globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.03.004
Scopus记录号: 2-s2.0-85014995959
论文题名:
A 16-ka oxygen-isotope record from Genggahai Lake on the northeastern Qinghai-Tibetan Plateau: Hydroclimatic evolution and changes in atmospheric circulation
作者: Qiang M.; Song L.; Jin Y.; Li Y.; Liu L.; Zhang J.; Zhao Y.; Chen F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 162
起始页码: 72
结束页码: 87
语种: 英语
英文关键词: Abrupt climatic change ; Asian summer monsoon ; Authigenic carbonate ; China ; Genggahai lake ; Oxygen isotopes ; Westerly circulation
Scopus关键词: Atmospheric thermodynamics ; Carbonation ; Climate change ; Climatology ; Lakes ; Meteorology ; Moisture ; Oxygen ; Stratigraphy ; Asian summer monsoons ; Authigenic carbonates ; China ; Climatic changes ; Oxygen isotopes ; Isotopes ; Mollusca
英文摘要: Moisture source history and changes in atmospheric circulation are the most important attributes for portraying past climate changes and for estimating possible future trends. However, few climate records reflecting these attributes are available from the marginal zones of the Asian summer monsoon. Here, we present a record of the oxygen isotopic composition of authigenic carbonates (δ18Ocarb) of sequential sediments from Genggahai Lake in the northeastern Qinghai-Tibetan Plateau (QTP). Isotopic analyses were performed on the fine-grained carbonate fraction (<38 μm), mollusc shells, and stem encrustations from submerged plants. The stratigraphic variations of the δ18O record from the different carbonate components exhibit a remarkably similar pattern, probably reflecting the fact that δ18Ocarb variability was controlled primarily by changes in the oxygen isotopic composition of the lake water (δ18OLW). Disequilibrium effects and water temperature are precluded as major factors affecting the δ18Ocarb variations. Genggahai Lake is hydrologically open and characterized by a rapid discharge rate, as indicated by analysis of the hydrological setting of the lake system and by the observed significant positive correlation between δ18OLW and the oxygen isotopic composition of the inflowing water (δ18OI). Under such hydrological conditions, we argue that the isotopic signals of different moisture sources should be reflected in the carbonate isotopic composition. Furthermore, placing the δ18Ocarb record in the context of regional palaeoclimate archives, we found that the isotopic signals, particularly the negative shifts from the average values, cannot be interpreted consistently, despite a process of evaporative enrichment at the lake surface. During the early- to mid-Holocene, low δ18Ocarb values during 10.6–9.4 and 7.4–6.3 ka were associated with higher lake levels, and thus the record may have been significantly affected by a strengthened Asian summer monsoon at those times and hence by a positive moisture balance. Isotopic depletions with similar magnitudes occurred at 15–14.5, 13.8–13.3, 12.5–11.4, 5.3–4.8, 3.7–3.4, 2.8–2.3, 1.7, 1.3, and 0.6 ka, i.e., within the Lateglacial and the late Holocene. These negative shifts in δ18Ocarb corresponded to lower lake-level phases, and most likely were a response to intensification of the mid-latitude westerly circulation that may have transported significantly more 18O-depleted moisture to the region, compared to that from the Asian summer monsoon. Overall, our results suggest that the alternating influence of the Asian summer monsoon and the westerlies played a significant role in determining the pattern of atmospheric circulation on the northeastern QTP. © 2017 Elsevier Ltd
资助项目: We thank Prof. X.P. Yang, Dr. K. Apolinarska and two anonymous reviewers for their constructive comments and suggestions to improve the early version of this paper. We also thank Dr. A.C.G. Henderson and Dr. J. Bloemendal for their valuable comments and language improvements, Prof. H.Z. Pan for identifying mollusc shells, and Ms. P.Y. Zhang for her assistance in isotopic analyses. This research was supported by the National Natural Science Foundation of China (grants 41271219, 41671190) and the National Research Foundation for the Doctoral Program of Higher Education of China (grant 20130211110035).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59274
Appears in Collections:过去全球变化的重建

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作者单位: MOE Key Laboratory of Western China's Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China; Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, China; Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Qiang M.,Song L.,Jin Y.,et al. A 16-ka oxygen-isotope record from Genggahai Lake on the northeastern Qinghai-Tibetan Plateau: Hydroclimatic evolution and changes in atmospheric circulation[J]. Quaternary Science Reviews,2017-01-01,162
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