气候变化领域集成服务门户(CCPortal): Ecologic shift and aridification in the northern Tibetan Plateau revealed by leaf wax n-alkane δ2H and δ13C records

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DOI	10.1016/j.palaeo.2018.11.005
	Ecologic shift and aridification in the northern Tibetan Plateau revealed by leaf wax n-alkane δ2H and δ13C records
	Wu M.; Zhuang G.; Hou M.; Miao Y.
发表日期	2019
ISSN	0031-0182
起始页码	464
结束页码	473
卷号	514
英文摘要	Two competing factors, the global cooling and the uplift of Tibetan Plateau, have been proposed to drive the central Asian aridification, but their relative role has seldom been discriminated in paleoclimate and paleoenvironment records. Here, we reconstruct a 14-million-year-long record of paleohydrology and paleoecology in the western Qaidam Basin by applying the compound-specific hydrogen (δ2H) and carbon (δ13C) isotope analyses to terrestrial leaf wax long-chain n-alkanes. The δ2H values are low during the interval of 14.6 to 13.0 Ma. Then the δ2H increases from 13.0 to 12.2 Ma and maintains high values from 12.2 to 3.2 Ma with a peak high value of −156.1‰ at 8.0 Ma. After 3.2 Ma, the δ2H values are low and vary larger than 30‰. The δ13C values decrease from 14.6 to 13.0 Ma and are low from 13.0 to 3.2 Ma except a high value at 3.8 Ma. Then they decrease slightly after 3.2 Ma. Low δ2H values indicate relatively wet climate between 14.6 and 13.0 Ma. The decreasing δ13C values during the same time period support the ecologic shift with the decline of warm component of conifers after the Mid-Miocene Climatic Optimum. High δ2H values since 13.0 Ma are synchronous with the uplift of northern Tibetan Plateau, implying tectonics-driven aridity. Large-amplitude variation in δ2H values since ca. 3.2 Ma seen in East and West Qaidam and lower δ13C values reveal the climatic cyclic responses to the Northern Hemisphere Glaciation. © 2018 Elsevier B.V.
英文关键词	Global cooling; Paleoclimate; Paleoecology; Qaidam Basin; Stable isotope; Tectonic uplift
语种	英语
scopus关键词	alkane; aridification; carbon isotope; coniferous tree; cooling; glaciation; hydrogen isotope; Miocene; Northern Hemisphere; paleoclimate; paleoecology; paleoenvironment; paleohydrology; stable isotope; uplift; wax; China; Qaidam Basin; Qinghai; Qinghai-Xizang Plateau; Coniferophyta
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151147
作者单位	Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Wu M.,Zhuang G.,Hou M.,et al. Ecologic shift and aridification in the northern Tibetan Plateau revealed by leaf wax n-alkane δ2H and δ13C records[J],2019,514.
APA	Wu M.,Zhuang G.,Hou M.,&Miao Y..(2019).Ecologic shift and aridification in the northern Tibetan Plateau revealed by leaf wax n-alkane δ2H and δ13C records.Palaeogeography, Palaeoclimatology, Palaeoecology,514.
MLA	Wu M.,et al."Ecologic shift and aridification in the northern Tibetan Plateau revealed by leaf wax n-alkane δ2H and δ13C records".Palaeogeography, Palaeoclimatology, Palaeoecology 514(2019).