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| Main Authors: | , , , , , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2019
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.907479 |
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| _version_ | 1867169516795985920 |
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| author | Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K Maximov, Georgy M Liebner, Susanne Grigoriev, Mikhail N Kitte, Axel Grosse, Guido |
| author_facet | Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K Maximov, Georgy M Liebner, Susanne Grigoriev, Mikhail N Kitte, Axel Grosse, Guido |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_907479 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Water and sediment properties at Polar Fox Lagoon Angelopoulos, Michael Overduin, Pier Paul Westermann, Sebastian Tronicke, Jens Strauss, Jens Schirrmeister, Lutz Biskaborn, Boris K Maximov, Georgy M Liebner, Susanne Grigoriev, Mikhail N Kitte, Axel Grosse, Guido AWI_Envi; AWI_Perma; electrical resistivity; Permafrost; Permafrost Research; Polar Terrestrial Environmental Systems @ AWI; Sediment; submarine; subsea; Temperature 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. |
| title | Water and sediment properties at Polar Fox Lagoon |
| topic | AWI_Envi; AWI_Perma; electrical resistivity; Permafrost; Permafrost Research; Polar Terrestrial Environmental Systems @ AWI; Sediment; submarine; subsea; Temperature |
| url | https://doi.org/10.1594/PANGAEA.907479 |