Preprints
https://doi.org/10.5194/egusphere-2024-3997
https://doi.org/10.5194/egusphere-2024-3997
23 Jan 2025
 | 23 Jan 2025

Comparing thaw probing, electrical resistivity tomography, and airborne lidar to quantify lateral and vertical thaw in rapidly degrading boreal permafrost

Thomas Douglas, Mark Jorgenson, Taylor Sullivan, and Caiyun Zhang

Abstract. Permafrost thaw across earth’s high latitudes is leading to dramatic changes in vegetation and hydrology. We undertook a two-decade long study on the Tanana Flats near Fairbanks, Alaska to measure permafrost thaw and associated ground surface subsidence via field-based and remote-sensing techniques. Our study focused on four transects that included an unburned area and three fire scars (1988, 2001, and 2010). Three types of permafrost quantification were used. First, repeat measurements of ground-surface elevation and depth to the top of near-surface permafrost were made between 1999 and 2020. Widespread near-surface permafrost degradation was evident between 2004 and 2020 with top-down thaw of near surface permafrost doubling from 18 % to 36 % over the study period. Multi-year frost and repeat thin permafrost, two types of permafrost aggradation, were almost completely absent by 2020. Second, we calculated rates of top-down versus lateral thaw using airborne lidar measurements collected in 2014 and 2020. Lateral thaw of tabular shaped permafrost boundaries and development of unfrozen zones between the bottom of the seasonally frozen layer and the top of near-surface permafrost (taliks) were evident. Third, repeated electrical resistivity tomography measurements in 2012 and 2020 supported surface-based thaw observations and allowed subsurface mapping of permafrost morphologies up to 20 m deep. The study identified strengths and limitations of the three methods we used to quantify permafrost thaw degradation. Future applications of these methods should apply geospatial analyses to identify variables relating surface and subsurface conditions to project finer scale field-based spatial assessments across broader regions.

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Journal article(s) based on this preprint

23 Sep 2025
Comparing thaw probing, electrical resistivity tomography, and airborne lidar to quantify lateral and vertical thaw in rapidly degrading boreal permafrost
Thomas A. Douglas, M. Torre Jorgenson, Taylor Sullivan, and Caiyun Zhang
The Cryosphere, 19, 3991–4009, https://doi.org/10.5194/tc-19-3991-2025,https://doi.org/10.5194/tc-19-3991-2025, 2025
Short summary
Thomas Douglas, Mark Jorgenson, Taylor Sullivan, and Caiyun Zhang

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3997', Di Wang, 31 Mar 2025
  • RC2: 'Comment on egusphere-2024-3997', Anonymous Referee #2, 17 Apr 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3997', Di Wang, 31 Mar 2025
  • RC2: 'Comment on egusphere-2024-3997', Anonymous Referee #2, 17 Apr 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to revisions (further review by editor and referees) (30 May 2025) by Heather Reese
AR by Thomas Douglas on behalf of the Authors (18 Jun 2025)  Author's response   Author's tracked changes 
EF by Polina Shvedko (19 Jun 2025)  Manuscript 
ED: Publish subject to minor revisions (review by editor) (24 Jun 2025) by Heather Reese
AR by Thomas Douglas on behalf of the Authors (03 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to technical corrections (21 Jul 2025) by Heather Reese
ED: Publish as is (30 Jul 2025) by Heather Reese
AR by Thomas Douglas on behalf of the Authors (20 Aug 2025)

Journal article(s) based on this preprint

23 Sep 2025
Comparing thaw probing, electrical resistivity tomography, and airborne lidar to quantify lateral and vertical thaw in rapidly degrading boreal permafrost
Thomas A. Douglas, M. Torre Jorgenson, Taylor Sullivan, and Caiyun Zhang
The Cryosphere, 19, 3991–4009, https://doi.org/10.5194/tc-19-3991-2025,https://doi.org/10.5194/tc-19-3991-2025, 2025
Short summary
Thomas Douglas, Mark Jorgenson, Taylor Sullivan, and Caiyun Zhang
Thomas Douglas, Mark Jorgenson, Taylor Sullivan, and Caiyun Zhang

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Short summary
Permafrost thaw across earth’s high latitudes is leading to dramatic changes in vegetation and hydrology. We undertook a two-decade long study on the Tanana Flats near Fairbanks, Alaska to measure permafrost thaw and associated ground surface subsidence via field-based and remote-sensing techniques. The study identified strengths and limitations of the three methods we used to quantify permafrost thaw degradation.
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