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	Interannual variations in the hydrothermal regime around a thermokarst lake in Beiluhe, Qinghai-Tibet Plateau
	Lin, Z. J.1; Niu, F. J.1; Fang, J. H.2; Luo, J.1; Yin, G. A.1
刊名	GEOMORPHOLOGY
	2017
卷号	276页码:16-26
关键词	Interannual variation Permafrost Hydrothermal regime Thermokarst lake Qinghai-Tibet Plateau
ISSN号	0169-555X
DOI	10.1016/j.geomorph.2016.09.035
通讯作者	Lin, Z. J.(zhanjulin@lzb.ac.cn)
英文摘要	Thermokarst is a term associated with the thaw of ice-rich permafrost and the resulting formation of irregular depressions in the landscape from thaw settlement. Thermokarst lakes may subsequently develop from ponds formed in depressions. These lakes commonly have collapsing shorelines, and the development of thermokarst terrain and associated thermal erosion may significantly influence the stability of infrastructure and the hydro thermal conditions of the surrounding permafrost. In this study, we examined interannual variations in the hydrothermal regime of a thermokarst lake in Beiluhe Basin based on field data measured in 2006-2013. The timing and nature of lake ice growth and melt were recorded. We observed considerable seasonal differences in lake water level (similar to 0.5 m) and differences in water level between the lake and the water table in the surrounding ground (over 1.0 m). The nearly-saturated ground at the lakeshore (similar to 35% in maximum volumetric water content) highlights the seepage effect from the lake to the surrounding ground. The vertical temperature profile from +2 m (air) to - 2 m (lake bottom) and to 60 m depth in the ground was measured. The annual mean air temperature, lake-surface temperature, and annual mean lake-bottom temperature in 2010-2011 were approximately -3.6, 0.4, and >5 degrees C, respectively. The thermal offsets between the air and the lake surface and between the lake surface and lake bottom were 3 and 7 degrees C, respectively. The annual mean lake-bottom temperatures ranged from 23 to 6.9 degrees C at water depths from 1.2 to 2.1 m. The asymmetry of the bathymetry has resulted in distinct thermal regimes beneath the lake bottom in different locations. A through-talik was present at the deepest side of the lake, but some permafrost extended laterally beneath the lake bottom at the shallower side, forming an hourglass shape in cross section at one end. Lateral thermal erosion along the lakeshore was linked to the lake-bottom temperature and lake depth. Variation in permafrost table depth from the lake center to the lakeshore was greater on the east side near deeper water (>= m) than at the west side where water was shallower (<= 70 cm). The results from this study have highlighted the hydrothermal relations between thermokarst lake development and permafrost conditions. (C) 2016 Elsevier B.V. All rights reserved.
收录类别	SCI
WOS关键词	THERMAL REGIME ; PERMAFROST ; BASIN ; HOLOCENE ; CANADA
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000388777800003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557523
专题	寒区旱区环境与工程研究所
通讯作者	Lin, Z. J.
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China 2.Qinghai Traff Sci Res Inst, Xining 810001, Peoples R China
推荐引用方式 GB/T 7714	Lin, Z. J.,Niu, F. J.,Fang, J. H.,et al. Interannual variations in the hydrothermal regime around a thermokarst lake in Beiluhe, Qinghai-Tibet Plateau[J]. GEOMORPHOLOGY,2017,276:16-26.
APA	Lin, Z. J.,Niu, F. J.,Fang, J. H.,Luo, J.,&Yin, G. A..(2017).Interannual variations in the hydrothermal regime around a thermokarst lake in Beiluhe, Qinghai-Tibet Plateau.GEOMORPHOLOGY,276,16-26.
MLA	Lin, Z. J.,et al."Interannual variations in the hydrothermal regime around a thermokarst lake in Beiluhe, Qinghai-Tibet Plateau".GEOMORPHOLOGY 276(2017):16-26.

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