Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes
Thermokarst lakes are prevalent in Arctic coastal lowland regions and sublake permafrost degradation and talik development contributes to greenhouse gas emissions by tapping the large permafrost carbon pool. Whereas lateral thermokarst lake expansion is readily apparent through remote sensing and sh...
Published in: | Journal of Geophysical Research: Solid Earth |
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:51457 2023-05-15T14:58:38+02:00 Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes Creighton, Andrea L. Parsekian, Andrew D. Angelopoulos, Michael Jones, Benjamin M. Bondurant, A. Engram, M. Lenz, Josefine Overduin, Pier Paul Grosse, Guido (Prof. Dr.) Babcock, E. Arp, Christopher D. 2018-10-19 https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/51457 https://doi.org/10.1029/2018JB016121 eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/51457 https://doi.org/10.1029/2018JB016121 info:eu-repo/semantics/closedAccess ddc:550 Institut für Geowissenschaften article doc-type:article 2018 ftubpotsdam https://doi.org/10.1029/2018JB016121 2022-07-28T20:50:38Z Thermokarst lakes are prevalent in Arctic coastal lowland regions and sublake permafrost degradation and talik development contributes to greenhouse gas emissions by tapping the large permafrost carbon pool. Whereas lateral thermokarst lake expansion is readily apparent through remote sensing and shoreline measurements, sublake thawed sediment conditions and talik growth are difficult to measure. Here we combine transient electromagnetic surveys with thermal modeling, backed up by measured permafrost properties and radiocarbon ages, to reveal closed-talik geometry associated with a thermokarst lake in continuous permafrost. To improve access to talik geometry data, we conducted surveys along three transient electromagnetic transects perpendicular to lakeshores with different decadal-scale expansion rates of 0.16, 0.38, and 0.58m/year. We modeled thermal development of the talik using boundary conditions based on field data from the lake, surrounding permafrost and a borehole, independent of the transient electromagnetics. A talik depth of 91m was determined from analysis of the transient electromagnetic surveys. Using a lake initiation age of 1400years before present and available subsurface properties the results from thermal modeling of the lake center arrived at a best estimate talk depth of 80m, which is on the same order of magnitude as the results from the transient electromagnetic survey. Our approach has provided a noninvasive estimate of talik geometry suitable for comparable settings throughout circum-Arctic coastal lowland regions. Article in Journal/Newspaper Arctic permafrost Thermokarst University of Potsdam: publish.UP Arctic Talik ENVELOPE(146.601,146.601,59.667,59.667) Journal of Geophysical Research: Solid Earth 123 11 9310 9323 |
institution |
Open Polar |
collection |
University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
ddc:550 Institut für Geowissenschaften |
spellingShingle |
ddc:550 Institut für Geowissenschaften Creighton, Andrea L. Parsekian, Andrew D. Angelopoulos, Michael Jones, Benjamin M. Bondurant, A. Engram, M. Lenz, Josefine Overduin, Pier Paul Grosse, Guido (Prof. Dr.) Babcock, E. Arp, Christopher D. Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes |
topic_facet |
ddc:550 Institut für Geowissenschaften |
description |
Thermokarst lakes are prevalent in Arctic coastal lowland regions and sublake permafrost degradation and talik development contributes to greenhouse gas emissions by tapping the large permafrost carbon pool. Whereas lateral thermokarst lake expansion is readily apparent through remote sensing and shoreline measurements, sublake thawed sediment conditions and talik growth are difficult to measure. Here we combine transient electromagnetic surveys with thermal modeling, backed up by measured permafrost properties and radiocarbon ages, to reveal closed-talik geometry associated with a thermokarst lake in continuous permafrost. To improve access to talik geometry data, we conducted surveys along three transient electromagnetic transects perpendicular to lakeshores with different decadal-scale expansion rates of 0.16, 0.38, and 0.58m/year. We modeled thermal development of the talik using boundary conditions based on field data from the lake, surrounding permafrost and a borehole, independent of the transient electromagnetics. A talik depth of 91m was determined from analysis of the transient electromagnetic surveys. Using a lake initiation age of 1400years before present and available subsurface properties the results from thermal modeling of the lake center arrived at a best estimate talk depth of 80m, which is on the same order of magnitude as the results from the transient electromagnetic survey. Our approach has provided a noninvasive estimate of talik geometry suitable for comparable settings throughout circum-Arctic coastal lowland regions. |
format |
Article in Journal/Newspaper |
author |
Creighton, Andrea L. Parsekian, Andrew D. Angelopoulos, Michael Jones, Benjamin M. Bondurant, A. Engram, M. Lenz, Josefine Overduin, Pier Paul Grosse, Guido (Prof. Dr.) Babcock, E. Arp, Christopher D. |
author_facet |
Creighton, Andrea L. Parsekian, Andrew D. Angelopoulos, Michael Jones, Benjamin M. Bondurant, A. Engram, M. Lenz, Josefine Overduin, Pier Paul Grosse, Guido (Prof. Dr.) Babcock, E. Arp, Christopher D. |
author_sort |
Creighton, Andrea L. |
title |
Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes |
title_short |
Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes |
title_full |
Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes |
title_fullStr |
Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes |
title_full_unstemmed |
Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes |
title_sort |
transient electromagnetic surveys for the determination of talik depth and geometry beneath thermokarst lakes |
publishDate |
2018 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/51457 https://doi.org/10.1029/2018JB016121 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Arctic Talik |
geographic_facet |
Arctic Talik |
genre |
Arctic permafrost Thermokarst |
genre_facet |
Arctic permafrost Thermokarst |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/51457 https://doi.org/10.1029/2018JB016121 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2018JB016121 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
123 |
container_issue |
11 |
container_start_page |
9310 |
op_container_end_page |
9323 |
_version_ |
1766330755424714752 |