气候变化领域集成服务门户(CCPortal): Stable isotopic evolutions of ground ice in permafrost of the Hoh Xil regions on the Qinghai-Tibet Plateau

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DOI	10.1016/j.quaint.2017.01.008
	Stable isotopic evolutions of ground ice in permafrost of the Hoh Xil regions on the Qinghai-Tibet Plateau
	Yang, Yuzhong; Wu, Qingbai; Zhang, Peng; Jiang, Guanli
发表日期	2017
ISSN	1040-6182
EISSN	1873-4553
起始页码	182
结束页码	190
卷号	444
英文摘要	Climatic warming-induced permafrost (ground ice) thaw is expected to considerably alter hydro-geomorphology and the water cycle on the Qinghai-Tibet Plateau (QTP). A unique feature of permafrost is the substantial enrichment of ground ice, which can be used to directly indicate the past climate and hydrological cycle. However, essential characteristics of ground ice on the QTP are not yet understood. The stable isotope technique was used to investigate the formation processes and initial source of water in the ground ice in a borehole of Zhuonaihu (ZNH) lake at the Hoh Xil permafrost regions in the hinterland of the QTP. Variability in water migration, replenishment of water, and climatic conditions (freezing rate) have created a complex isotopic stratigraphy and ice growth history. The delta D-delta O-18 relationship of ground ice samples showed similar characteristics to a local meteoric water line of regional precipitation on QTP, and the D-excess-delta D relations of ground ice reveal different features from those of precipitation and freezing condition. The near-surface ground ice (0-3 m) was enriched in delta O-18 and delta D which was formed from freezing of active layer water suffering evaporation, and deep layer ground ice (> 3 m) was depleted in these isotopes. Stable isotope results were indicative of past-precipitation origin of ground ice between 2.5 and 5.5 m. Ground ice between depths of 5.5 and 10 m was formed under unstable freezing conditions. However, ice from 10 to 16 m was formed by freezing segregation of liquid water. Comparison of the results with other five boreholes indicates that differences in lithology, source water, and climatic conditions were responsible for the significant deviations in ground ice isotopes. This research provides an insight into the fundamental formation processes related to ground ice in the QTP, which will provide important guidance for future studies of permafrost hydrology. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.
英文关键词	Ground ice; Stable isotopes; Qinghai-Tibet Plateau; Formation process
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS关键词	ORIGIN ; NORTH
WOS记录号	WOS:000406754700017
来源期刊	QUATERNARY INTERNATIONAL
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/240204
作者单位	[Yang, Yuzhong; Wu, Qingbai; Zhang, Peng; Jiang, Guanli] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yuzhong,Wu, Qingbai,Zhang, Peng,et al. Stable isotopic evolutions of ground ice in permafrost of the Hoh Xil regions on the Qinghai-Tibet Plateau[J]. 中国科学院西北生态环境资源研究院,2017,444.
APA	Yang, Yuzhong,Wu, Qingbai,Zhang, Peng,&Jiang, Guanli.(2017).Stable isotopic evolutions of ground ice in permafrost of the Hoh Xil regions on the Qinghai-Tibet Plateau.QUATERNARY INTERNATIONAL,444.
MLA	Yang, Yuzhong,et al."Stable isotopic evolutions of ground ice in permafrost of the Hoh Xil regions on the Qinghai-Tibet Plateau".QUATERNARY INTERNATIONAL 444(2017).