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DOI	10.5194/tc-13-3155-2019
	Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen
	Demidov N.; Wetterich S.; Verkulich S.; Ekaykin A.; Meyer H.; Anisimov M.; Schirrmeister L.; Demidov V.; Hodson A.J.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	3155
结束页码	3169
卷号	13 期号:11
英文摘要	Pingos are common features in permafrost regions that form by subsurface massive-ice aggradation and create hill-like landforms. Pingos on Spitsbergen have been previously studied to explore their structure, formation timing and connection to springs as well as their role in postglacial landform evolution. However, detailed hydrochemical and stable-isotope studies of massive-ice samples recovered by drilling have yet to be used to study the origin and freezing conditions in pingos. Our core record of 20.7 m thick massive pingo ice from Grøndalen is differentiated into four units: two characterised by decreasing and d (units I and III) and two others showing the opposite trend (units II and IV). These delineate changes between episodes of closed-system freezing with only slight recharge inversions of the water reservoir and more complicated episodes of groundwater freezing under semi-closed conditions when the reservoir was recharged. The water source for pingo formation shows similarity to spring water data from the valley with prevalent Na+ and ${HCO}_{3}^{-}$ ions. The sub-permafrost groundwater originates from subglacial meltwater that most probably followed the fault structures of Grøndalen and Bøhmdalen. The presence of permafrost below the pingo ice body suggests that the talik is frozen, and the water supply and pingo growth are terminated. The maximum thaw depth of the active layer reaching the top of the massive ice leads to its successive melt with crater development and makes the pingo extremely sensitive to further warming. © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118802
作者单位	Arctic and Antarctic Research Institute, Bering St. 38, St. Petersburg, 199397, Russian Federation; Alfred Wegener Institute Helmholtz, Center for Polar and Marine Research, Telegrafenberg A45, Potsdam, 14473, Germany; St. Petersburg State University, 10th Line 33-35, St. Petersburg, 199178, Russian Federation; University Centre in Svalbard, Longyearbyen, 9171, Norway; Western Norway University of Applied Sciences, Røyrgata 6, Sogndal, 6856, Norway
推荐引用方式 GB/T 7714	Demidov N.,Wetterich S.,Verkulich S.,et al. Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen[J],2019,13(11).
APA	Demidov N..,Wetterich S..,Verkulich S..,Ekaykin A..,Meyer H..,...&Hodson A.J..(2019).Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen.The Cryosphere,13(11).
MLA	Demidov N.,et al."Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen".The Cryosphere 13.11(2019).