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...
Published in: | Journal of Geophysical Research: Earth Surface |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9075 2023-05-15T15:10:43+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://doi.org/10.1029/2019JF005424 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9075 eng eng doi:10.1029/2019JF005424 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9075 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY ddc:551.48 thermokarst lake talik lagoon subsea permafrost salt diffusion Siberia doc-type:article 2020 ftsubggeo https://doi.org/10.1029/2019JF005424 2022-11-09T06:51:40Z 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. Article in Journal/Newspaper Arctic Ice permafrost polar fox Thermokarst Tiksi Tiksi Bay Siberia GEO-LEOe-docs (FID GEO) Arctic Tiksi ENVELOPE(128.867,128.867,71.633,71.633) Talik ENVELOPE(146.601,146.601,59.667,59.667) Journal of Geophysical Research: Earth Surface 125 10 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:551.48 thermokarst lake talik lagoon subsea permafrost salt diffusion Siberia |
spellingShingle |
ddc:551.48 thermokarst lake talik lagoon subsea permafrost salt diffusion Siberia 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? |
topic_facet |
ddc:551.48 thermokarst lake talik lagoon subsea permafrost salt diffusion Siberia |
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 |
Article in Journal/Newspaper |
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 |
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? |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019JF005424 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9075 |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Arctic Tiksi Talik |
geographic_facet |
Arctic Tiksi Talik |
genre |
Arctic Ice permafrost polar fox Thermokarst Tiksi Tiksi Bay Siberia |
genre_facet |
Arctic Ice permafrost polar fox Thermokarst Tiksi Tiksi Bay Siberia |
op_relation |
doi:10.1029/2019JF005424 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9075 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2019JF005424 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
125 |
container_issue |
10 |
_version_ |
1766341693470146560 |