气候变化领域集成服务门户(CCPortal): Mid- to late-Holocene paleoenvironmental changes inferred from organic geochemical proxies in Lake Tangra Yumco, Central Tibetan Plateau

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DOI	10.1177/0959683617693893
	Mid- to late-Holocene paleoenvironmental changes inferred from organic geochemical proxies in Lake Tangra Yumco, Central Tibetan Plateau
	Wang, Yong; Wang, Junbo; Zhu, Liping; Lin, Xiao; Hu, Jianfang; Ma, Qingfeng; Ju, Jianting; Peng, Ping; Yang, Ruimin
通讯作者	Wang, Y ; Wang, JB (通讯作者)
发表日期	2017
ISSN	0959-6836
EISSN	1477-0911
起始页码	1475
结束页码	1486
卷号	27 期号:10
英文摘要	Investigations of the paleoclimate and paleoenvironmental changes in the Tibetan Plateau in recent years have led to many significant achievements. However, high-resolution lake records from the mid-to late-Holocene have not been determined for the Central Tibetan Plateau, which is in the transition zone between the Indian summer monsoon (ISM) system and the westerlies. In this study, we analyzed the distribution and compound-specific carbon isotope compositions (delta C-13) of sedimentary n-alkanes and the bulk sediment total organic matter (TOC), total nitrogen (TN), and C/N ratios to reconstruct the paleoenvironmental changes over the past 6 cal. ka BP using a 376-cm sediment core from the southern basin of Tangra Yumco, Central Tibetan Plateau. Our results indicated that clear stepwise decreases in lake productivity and lake level occurred during the mid-to late-Holocene based on decreases in delta C-13 values of mid-chain n-alkanes and Paq (an n-alkane-based proxy). Additionally, the variations in the TOC, TN, and C/N ratios revealed generally increased inputs of allochthonous organic matter over the past 6 cal. ka BP. When our findings at Tangra Yumco were compared with records from the Central Tibetan Plateau and adjacent regions, we found generally consistent patterns of lake environmental changes over the past 6 cal. ka BP, suggesting that the climate of the Central Tibetan Plateau was primarily influenced by the ISM system at the millennial time scale. Therefore, our results depict the evolution of the ISM over the past 6 cal. ka BP in the Central Tibetan Plateau, which corresponds to summer solar insolation and the migrations of the Intertropical Convergence Zone (ITCZ). We also propose that the climate of the North Atlantics influenced the climate of the Central Tibetan Plateau through some indirect climatic mechanisms.
关键词	NORTH-ATLANTIC CLIMATE OCEAN SUMMER MONSOON INTERTROPICAL CONVERGENCE ZONE ARID CENTRAL-ASIA NAM-CO ENVIRONMENTAL-CHANGES INDIAN MONSOON LEVEL CHANGES N-ALKANES MT. KENYA
英文关键词	compound-specific carbon isotope; Indian summer monsoon; Intertropical Convergence Zone; lake sediments; n-alkane; paleoenvironmental changes; Tangra Yumco; Tibetan Plateau
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000412720200005
来源期刊	HOLOCENE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259033
推荐引用方式 GB/T 7714	Wang, Yong,Wang, Junbo,Zhu, Liping,et al. Mid- to late-Holocene paleoenvironmental changes inferred from organic geochemical proxies in Lake Tangra Yumco, Central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2017,27(10).
APA	Wang, Yong.,Wang, Junbo.,Zhu, Liping.,Lin, Xiao.,Hu, Jianfang.,...&Yang, Ruimin.(2017).Mid- to late-Holocene paleoenvironmental changes inferred from organic geochemical proxies in Lake Tangra Yumco, Central Tibetan Plateau.HOLOCENE,27(10).
MLA	Wang, Yong,et al."Mid- to late-Holocene paleoenvironmental changes inferred from organic geochemical proxies in Lake Tangra Yumco, Central Tibetan Plateau".HOLOCENE 27.10(2017).