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TitleRecent advances (2010-2019) in the study of taliks
AuthorO'Neill, H B; Léveillée, P R; Lebedeva, L; Ling, F
SourceTransactions of the International Permafrost Association No. 3; by Burn, C (ed.); Permafrost and Periglacial Processes vol. 31, no. 3, 2020 p. 346-357, (Open Access)
Alt SeriesNatural Resources Canada, Contribution Series 20190495
Mediaon-line; digital
File formatpdf
Subjectsenvironmental geology; surficial geology/geomorphology; hydrogeology; Nature and Environment; Science and Technology; climate; permafrost; ground ice; periglacial features; talik; methane; gas seeps; models; groundwater; salt springs; groundwater flow; thermal analyses; computer simulations; hydrologic environment; fire; hydrology; infrastructures; climate change; greenhouse gases; atmospheric emissions; permafrost degradation; cumulative effects
Illustrationsschematic cross-sections; tables
ProgramClimate Change Geoscience, Permafrost
Released2020 05 06
AbstractTaliks are bodies or layers of unfrozen ground in permafrost areas. Recent research on taliks has been driven largely by the potential for release of greenhouse gases as taliks expand, and engineering challenges associated with thawing permafrost. Observations of talik configuration and development have been assisted by advances in geophysical techniques that complement mechanical and thermal measurements. Suprapermafrost taliks have been observed in a range of settings associated with disturbance from wildfire and infrastructure. These features are included in a revised talik classification scheme presented in this paper. Observations of methane release have renewed interest in lake talik initiation and development, resulting in substantial efforts to model thaw lake expansion. Hotspots of methane release have also been identified at saline springs. Recent simulations indicate that groundwater flow can significantly accelerate talik expansion and that incorporating heat advection may be required for accurate transient simulations. Ongoing global warming is expected to exacerbate the effects of surface disturbances on talik development and limit the ability of permafrost to recover in marginal permafrost areas.
Summary(Plain Language Summary, not published)
This paper is a review of recent (2010-2019) research on taliks (unfrozen zones) in permafrost. The review paper proposes updated nomenclature and presents an updated conceptual diagram of talik zones based on recent literature. The review focuses on research developments on taliks associated with lakes, infrastructure, wildfire, climate change, and groundwater movement.