2019
DOI: 10.5194/tc-13-3155-2019
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Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen

Abstract: 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 stableisotope 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 thi… Show more

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Cited by 17 publications
(32 citation statements)
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“…Generically though, they relate more to closed-system pingos, because the causal mechanism of hydraulic pressures is essentially similar, although operating over much longer time-scales. We emphasise that this conceptual model for pingo formation represents an end-member of pingo-forming processes, which is not exclusive, but may act in combination with others, such as those reported nearby by Demidov et al (2019).…”
Section: Discussionmentioning
confidence: 90%
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“…Generically though, they relate more to closed-system pingos, because the causal mechanism of hydraulic pressures is essentially similar, although operating over much longer time-scales. We emphasise that this conceptual model for pingo formation represents an end-member of pingo-forming processes, which is not exclusive, but may act in combination with others, such as those reported nearby by Demidov et al (2019).…”
Section: Discussionmentioning
confidence: 90%
“…by Demidov et al, 2019), we would not expect to observe such a systematic trend along the valley axis, as this would be unlikely in a system dependent upon localised areas for infiltration. We therefore suggest that the unexpected landwards increase in Clis difficult to explain without the sequence of events illustrated in Fig.…”
Section: Comparison With Hydrological Processes Inferred From Pingo Smentioning
confidence: 90%
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“…For S s , we used a matrix compressibility of 7 × 10 −10 to 7 × 10 −8 Pa −1 (based on common estimates for fractured rocks; e.g. Domenico and Mifflin, 1965;Domenico and Schwartz, 1998;Fitts, 2002) yielding a S s of 7×10 −6 to 7×10 −4 m −1 (in line with literature values; cf. Singhal and Gupta, 2010).…”
Section: Groundwater Modelmentioning
confidence: 99%
“…The hydrogeological mechanisms causing the sustained flow of sub-permafrost groundwater to surface springs remain elusive (Scheidegger et al, 2012). Earlier it was proposed that subglacial meltwater from underneath warmbased ice sheets or glaciers would sufficiently recharge a sub-permafrost aquifer (Demidov et al, 2019;Liestøl, 1977;Scheidegger et al, 2012;Scheidegger and Bense, 2014). However, in regions of continuous permafrost lacking warmbased glaciers or other groundwater recharge pathways, such models do not seem applicable (Ballantyne, 2018;Grasby et al, 2014;Woo, 2012).…”
Section: Introductionmentioning
confidence: 99%