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DOI	10.1016/j.palaeo.2022.111027
	Changes in atmospheric circulation and glacier melting since the last deglaciation revealed by a lacustrine dD record at Ngamring Co, the upper-middle Yarlung Tsangpo watershed
	Sun, Zhe; Ji, Kejia; Hou, Xiaohuan; Yuan, Kan; Li, Can-Ge; Hou, Juzhi
通讯作者	Hou, JZ (通讯作者)
发表日期	2022
ISSN	0031-0182
EISSN	1872-616X
卷号	598
英文摘要	Both the Indian Summer Monsoon (ISM) and glacier meltwater are suggested to significantly influence the modern discharge of the Yarlung Tsangpo River, which is the longest river of Tibet and is an important fresh-water source for the local population as well as for the large populations in India and Bangladesh in the lower reaches. Understanding past hydroclimatic variations of the region is therefore important for predicting future changes under global warming scenarios. Here we present a continuous compound-specific hydrogen isotope record of sedimentary leaf waxes covering the past 18 ka (ka = 1000 yr) from Ngamring Co, located in the upper-middle Yarlung Tsangpo range, a typical monsoonal region, with the aim of documenting hydroclimatic changes since the last deglaciation. Compared with measurements of continuous scanning XRF and magnetic suscepti-bility, the delta D at Ngamring Co is believed to reflect atmospheric circulation and glacial meltwater input rather than direct local humidity. In detail, the record indicates relatively enriched delta D values during the Late Pleis-tocene, suggesting the predominance of the Westerlies and limited moisture delivery by the ISM, which was associated with cooling at high northern latitudes. The fast delta D depletion indicates that ISM penetrated into TP since ~10.5 ka BP (before present, the present is 1950 CE), then the gradually increased delta D values suggested the ISM attenuated in phase with summer insolation during early to middle Holocene. The negative deviation of 8D (> 8 parts per thousand, abrupt depleted at 3 ka BP) since-6 ka BP suggested glacier melting in the catchment and ended at-0.2 ka BP, which emphasizes the glacial contribution to the hydroclimatic change in Yarlung Tsangpo watershed. Such depletion was also observed at Aweng Co in the western TP, which suggests that a glacier meltwater contribution to lakes and rivers may be a large-scale phenomenon on the TP. Comparison of the delta D record from Ngamring Co with independent paleotemperature records indicates the control of summer tem-perature/insolation on glacier melting may not be the most important factor during the late Holocene, and instead we propose that the mean annual air temperature and glacier volume were more crucial to the melting process. If our inference is correct, the disappearance of a glacier from the Ngamring Co basin at ~0.2 ka BP is likely to be indicative of the fate of other glaciers on the TP under ongoing global warming. However, inde-pendent reconstructions of temperature and direct glacier dynamics from the same site are needed to validate our hypothesis.
关键词	SOUTHERN TIBETAN PLATEAU SEDIMENTARY N-ALKANES SUMMER MONSOON ONSET INDIAN MONSOON EARLY HOLOCENE CLIMATE-CHANGE DELTA-D INTERANNUAL VARIABILITY ISOTOPIC FRACTIONATION TERRESTRIAL PLANTS
英文关键词	Ngamring Co; Last deglaciation; Hydrogen isotopes; Indian Summer Monsoon; Mid-latitude Westerlies; Glacier melting
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000802968400004
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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/260665
推荐引用方式 GB/T 7714	Sun, Zhe,Ji, Kejia,Hou, Xiaohuan,et al. Changes in atmospheric circulation and glacier melting since the last deglaciation revealed by a lacustrine dD record at Ngamring Co, the upper-middle Yarlung Tsangpo watershed [J]. 中国科学院青藏高原研究所,2022,598.
APA	Sun, Zhe,Ji, Kejia,Hou, Xiaohuan,Yuan, Kan,Li, Can-Ge,&Hou, Juzhi.(2022). Changes in atmospheric circulation and glacier melting since the last deglaciation revealed by a lacustrine dD record at Ngamring Co, the upper-middle Yarlung Tsangpo watershed .PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,598.
MLA	Sun, Zhe,et al." Changes in atmospheric circulation and glacier melting since the last deglaciation revealed by a lacustrine dD record at Ngamring Co, the upper-middle Yarlung Tsangpo watershed ".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 598(2022).