Thermokarst lake to lagoon transitions in Eastern Siberia
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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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:56018 2024-05-19T07:36:30+00:00 Thermokarst lake to lagoon transitions in Eastern Siberia Angelopoulos, Michael (Dr.) Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens (Prof. Dr.) Strauss, Jens Schirrmeister, Lutz (Dr.) Biskaborn, Boris K. Liebner, Susanne (Jun.-Prof. Dr.) Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido (Prof. Dr.) 2020-07-20 https://publishup.uni-potsdam.de/frontdoor/index/index/docId/56018 https://doi.org/10.1029/2019JF005424 eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/56018 https://doi.org/10.1029/2019JF005424 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/closedAccess ddc:550 Institut für Biochemie und Biologie Institut für Geowissenschaften article doc-type:article 2020 ftubpotsdam https://doi.org/10.1029/2019JF005424 2024-04-30T23:32:08Z 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 degrees 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 University of Potsdam: publish.UP Journal of Geophysical Research: Earth Surface 125 10 |
institution |
Open Polar |
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University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
ddc:550 Institut für Biochemie und Biologie Institut für Geowissenschaften |
spellingShingle |
ddc:550 Institut für Biochemie und Biologie Institut für Geowissenschaften Angelopoulos, Michael (Dr.) Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens (Prof. Dr.) Strauss, Jens Schirrmeister, Lutz (Dr.) Biskaborn, Boris K. Liebner, Susanne (Jun.-Prof. Dr.) Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido (Prof. Dr.) Thermokarst lake to lagoon transitions in Eastern Siberia |
topic_facet |
ddc:550 Institut für Biochemie und Biologie Institut für Geowissenschaften |
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 degrees 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 (Dr.) Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens (Prof. Dr.) Strauss, Jens Schirrmeister, Lutz (Dr.) Biskaborn, Boris K. Liebner, Susanne (Jun.-Prof. Dr.) Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido (Prof. Dr.) |
author_facet |
Angelopoulos, Michael (Dr.) Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens (Prof. Dr.) Strauss, Jens Schirrmeister, Lutz (Dr.) Biskaborn, Boris K. Liebner, Susanne (Jun.-Prof. Dr.) Maksimov, Georgii Grigoriev, Mikhail N. Grosse, Guido (Prof. Dr.) |
author_sort |
Angelopoulos, Michael (Dr.) |
title |
Thermokarst lake to lagoon transitions in Eastern Siberia |
title_short |
Thermokarst lake to lagoon transitions in Eastern Siberia |
title_full |
Thermokarst lake to lagoon transitions in Eastern Siberia |
title_fullStr |
Thermokarst lake to lagoon transitions in Eastern Siberia |
title_full_unstemmed |
Thermokarst lake to lagoon transitions in Eastern Siberia |
title_sort |
thermokarst lake to lagoon transitions in eastern siberia |
publishDate |
2020 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/56018 https://doi.org/10.1029/2019JF005424 |
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 |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/56018 https://doi.org/10.1029/2019JF005424 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2019JF005424 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
125 |
container_issue |
10 |
_version_ |
1799475623237779456 |