| Title | Recent advances (2010-2019) in the study of taliks |
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| Author | O'Neill, H B ;
Léveillée, P R; Lebedeva, L; Ling, F |
| Source | Transactions of the International Permafrost Association No. 3; by Burn, C (ed.); Permafrost and Periglacial Processes vol. 31, no. 3, 2020 p. 346-357, https://doi.org/10.1002/ppp.2050 |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20190495 |
| Publisher | Wiley |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Subjects | environmental 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; cumulative effects |
| Illustrations | schematic cross-sections; tables |
| Program | Climate Change
Geoscience Permafrost |
| Released | 2020 05 06 |
| Abstract | Taliks 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. |
| GEOSCAN ID | 321637 |
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