Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze?
As the Arctic coast erodes, it drains thermokarst lakes, transforming them into lagoons, and, eventually, integrates them into subsea permafrost. Lagoons represent the first stage of a thermokarst lake transition to a marine setting and possibly more saline and colder upper boundary conditions. In t...
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ftdatacite:10.23689/fidgeo-4729 2023-05-15T15:09:34+02:00 Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K. Liebner, Susanne Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido 2020 https://dx.doi.org/10.23689/fidgeo-4729 https://e-docs.geo-leo.de/handle/11858/9075 en eng FID GEO Text Article article-journal ScholarlyArticle 2020 ftdatacite https://doi.org/10.23689/fidgeo-4729 2021-11-05T12:55:41Z As the Arctic coast erodes, it drains thermokarst lakes, transforming them into lagoons, and, eventually, integrates them into subsea permafrost. Lagoons represent the first stage of a thermokarst lake transition to a marine setting and possibly more saline and colder upper boundary conditions. In this research, borehole data, electrical resistivity surveying, and modeling of heat and salt diffusion were carried out at Polar Fox Lagoon on the Bykovsky Peninsula, Siberia. Polar Fox Lagoon is a seasonally isolated water body connected to Tiksi Bay through a channel, leading to hypersaline waters under the ice cover. The boreholes in the center of the lagoon revealed floating ice and a saline cryotic bed underlain by a saline cryotic talik, a thin ice-bearing permafrost layer, and unfrozen ground. The bathymetry showed that most of the lagoon had bedfast ice in spring. In bedfast ice areas, the electrical resistivity profiles suggested that an unfrozen saline layer was underlain by a thick layer of refrozen talik. The modeling showed that thermokarst lake taliks can refreeze when submerged in saltwater with mean annual bottom water temperatures below or slightly above 0°C. This occurs, because the top-down chemical degradation of newly formed ice-bearing permafrost is slower than the refreezing of the talik. Hence, lagoons may precondition taliks with a layer of ice-bearing permafrost before encroachment by the sea, and this frozen layer may act as a cap on gas migration out of the underlying talik. Text Arctic Ice permafrost polar fox Thermokarst Tiksi Tiksi Bay Siberia DataCite Metadata Store (German National Library of Science and Technology) Arctic Talik ENVELOPE(146.601,146.601,59.667,59.667) Tiksi ENVELOPE(128.867,128.867,71.633,71.633) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
As the Arctic coast erodes, it drains thermokarst lakes, transforming them into lagoons, and, eventually, integrates them into subsea permafrost. Lagoons represent the first stage of a thermokarst lake transition to a marine setting and possibly more saline and colder upper boundary conditions. In this research, borehole data, electrical resistivity surveying, and modeling of heat and salt diffusion were carried out at Polar Fox Lagoon on the Bykovsky Peninsula, Siberia. Polar Fox Lagoon is a seasonally isolated water body connected to Tiksi Bay through a channel, leading to hypersaline waters under the ice cover. The boreholes in the center of the lagoon revealed floating ice and a saline cryotic bed underlain by a saline cryotic talik, a thin ice-bearing permafrost layer, and unfrozen ground. The bathymetry showed that most of the lagoon had bedfast ice in spring. In bedfast ice areas, the electrical resistivity profiles suggested that an unfrozen saline layer was underlain by a thick layer of refrozen talik. The modeling showed that thermokarst lake taliks can refreeze when submerged in saltwater with mean annual bottom water temperatures below or slightly above 0°C. This occurs, because the top-down chemical degradation of newly formed ice-bearing permafrost is slower than the refreezing of the talik. Hence, lagoons may precondition taliks with a layer of ice-bearing permafrost before encroachment by the sea, and this frozen layer may act as a cap on gas migration out of the underlying talik. |
format |
Text |
author |
Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K. Liebner, Susanne Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido |
spellingShingle |
Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K. Liebner, Susanne Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? |
author_facet |
Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K. Liebner, Susanne Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido |
author_sort |
Angelopoulos, Michael |
title |
Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? |
title_short |
Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? |
title_full |
Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? |
title_fullStr |
Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? |
title_full_unstemmed |
Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? |
title_sort |
thermokarst lake to lagoon transitions in eastern siberia: do submerged taliks refreeze? |
publisher |
FID GEO |
publishDate |
2020 |
url |
https://dx.doi.org/10.23689/fidgeo-4729 https://e-docs.geo-leo.de/handle/11858/9075 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) ENVELOPE(128.867,128.867,71.633,71.633) |
geographic |
Arctic Talik Tiksi |
geographic_facet |
Arctic Talik Tiksi |
genre |
Arctic Ice permafrost polar fox Thermokarst Tiksi Tiksi Bay Siberia |
genre_facet |
Arctic Ice permafrost polar fox Thermokarst Tiksi Tiksi Bay Siberia |
op_doi |
https://doi.org/10.23689/fidgeo-4729 |
_version_ |
1766340743240089600 |