气候变化领域集成服务门户(CCPortal): A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet

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DOI	10.1007/s11434-011-4656-z
	A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet
	Lu XinMiao; Zhu LiPing; Nishimura, Mitsugu; Morita, Yoshimune; Watanabe, Takahiro; Nakamura, Toshio; Wang Yong
通讯作者	Zhu, LP (通讯作者)
发表日期	2011
ISSN	1001-6538
EISSN	1861-9541
起始页码	2931
结束页码	2940
卷号	56 期号:27
英文摘要	A 380-cm-long sediment core was acquired from the deep water area of Pumoyum Co, southern Tibet. Twenty-five plant residue samples were selected, and organic carbon stable isotopes were obtained using the AMS C-14 chronological method. The C-14 age and carbon reservoir effect were calibrated with surface sedimentation rate measurements using Pb-210 dating. Results showed that the core sediment deposited over 19 cal ka BP. Based on a multi-proxy analysis of TOC and IC contents, grain size and pollen assemblage data, the palaeoclimatic evolution of Pumoyum Co was reconstructed since the last glacial. Pumoyum Co was a shallow lake prior to 16.2 cal ka BP; although the glacier around the lake began to melt due to increasing temperatures, climate was still cold and dry. In the interval of 16.2-11.8 cal ka BP, the sedimentary environment fluctuated drastically and frequently. Two cold-events occurred at 14.2 and 11.8 cal ka BP, and these may correspond to the Older Dryas and the Younger Dryas events, respectively. After 11.8 cal ka BP, Pumoyun Co developed into the deep lake as it is now. The lake water temperature was relatively lower at that time because of influx of cold water from glacial meltwater entering the lake. As a result, the multi-proxy indicators showed no sign of warm conditions. Comparisons between the sedimentary record of Pumoyum Co with that of other lakes of the same age in southern Tibet indicate a warmer climate following the last deglaciation influenced the southeastern Tibetan Plateau. These results imply that the southwest Asian monsoon gradually became stronger since the deglaciation during its expansion to the inner plateau. The glacial-supplied water of the lake responded sensitively to cold-events. The entire southern Tibet region was dominantly influenced climatically by the southwest Asian monsoon during the Holocene.
关键词	LAKE-SEDIMENTS PLATEAU CLIMATE
英文关键词	Tibet; Pumoyum Co; lake sedimentation; environmental change; high resolution; glacial meltwater
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000295103900009
来源期刊	CHINESE SCIENCE BULLETIN
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/257951
推荐引用方式 GB/T 7714	Lu XinMiao,Zhu LiPing,Nishimura, Mitsugu,et al. A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet[J]. 中国科学院青藏高原研究所,2011,56(27).
APA	Lu XinMiao.,Zhu LiPing.,Nishimura, Mitsugu.,Morita, Yoshimune.,Watanabe, Takahiro.,...&Wang Yong.(2011).A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet.CHINESE SCIENCE BULLETIN,56(27).
MLA	Lu XinMiao,et al."A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet".CHINESE SCIENCE BULLETIN 56.27(2011).