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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 (2019): Water and sediment properties at Polar Fox Lagoon. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.907479 (dataset in review), Supplement to: Angelopoulos, Michael; Overduin, Pier Paul; Westermann, Sebastian; Tronicke, Jens; Strauss, Jens; Schirrmeister, Lutz; Biskaborn, Boris K; Maximov, Georgy M; Liebner, Susanne; Grigoriev, Mikhail N (submitted): Thermokarst lake to lagoon transitions in eastern Siberia: Do taliks refreeze? Journal of Geophysical Research-Earth Surface

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Abstract:
As the Arctic coast erodes, it drains thermokarst lakes, transforming them into lagoons and, eventually, integrates them into subsea permafrost. Upon submergence in saltwater, taliks may refreeze, but their ultimate fate remains uncertain. 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, boreholes, temperature cable measurements, electrical resistivity surveying, as well as modelling 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 in spring. The boreholes in the centre 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 non-cryotic ground. The bathymetry, however, showed that most of the lagoon was ice grounded in spring. In bedfast ice areas, the electrical resistivity profiles suggest that a saline active layer was underlain by a refrozen talik. The modelling of heat and salt diffusion in the lagoon centre suggests thermokarst lake taliks refreeze when submerged in saltwater with mean annual bottom water temperatures below or slightly above 0°C. As heat diffusion is typically faster than salt diffusion, the top-down chemical degradation of newly formed frozen permafrost is slower than the advancement of the frozen ground's lower boundary. Hence, in coastal regions with warm waters, the relatively colder lagoons may pre-condition thermokarst lake taliks with a layer of ice-bearing permafrost before encroachment by the sea. This frozen layer may slow subsea permafrost degradation and act as a cap on gas migration out of an unfrozen talik.
Keyword(s):
electrical resistivity; Permafrost; sediment; submarine; subsea; Temperature
Coverage:
Median Latitude: 71.743746 * Median Longitude: 129.337908 * South-bound Latitude: 71.728435 * West-bound Longitude: 129.313954 * North-bound Latitude: 71.752150 * East-bound Longitude: 129.348090
Date/Time Start: 2017-04-10T00:00:00 * Date/Time End: 2019-04-07T06:50:15
Size:
10 datasets

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Datasets listed in this publication series

  1. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Borehole temperature data profiles over depth in sediment core PG2411-1 in Polar Fox Lagoon. https://doi.pangaea.de/10.1594/PANGAEA.907478
  2. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical conductivity and temperature in the water column of Polar Fox Lagoon. https://doi.pangaea.de/10.1594/PANGAEA.907475
  3. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical resistivity tomography profiles collected in floating electrode mode from the lagoon's water surface, Profile A'-A. https://doi.pangaea.de/10.1594/PANGAEA.907469
  4. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical resistivity tomography profiles collected in floating electrode mode from the lagoon's water surface, Profile B-B'. https://doi.pangaea.de/10.1594/PANGAEA.907470
  5. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical resistivity tomography profiles collected in floating electrode mode from the lagoon's water surface, Profile C-C'. https://doi.pangaea.de/10.1594/PANGAEA.907471
  6. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical resistivity tomography profiles collected in floating electrode mode from the lagoon's water surface, Profile D-D'. https://doi.pangaea.de/10.1594/PANGAEA.907472
  7. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical resistivity tomography profiles collected in floating electrode mode from the lagoon's water surface, Profile E-E'. https://doi.pangaea.de/10.1594/PANGAEA.907473
  8. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Electrical resistivity tomography profiles collected in floating electrode mode from the lagoon's water surface, Profile F-F'. https://doi.pangaea.de/10.1594/PANGAEA.907474
  9. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Ice and snow thicknesses and water column depth at ten locations in Polar Fox Lagoon. https://doi.pangaea.de/10.1594/PANGAEA.907476
  10. Angelopoulos, M; Overduin, PP; Westermann, S et al. (2019): Porewater electrical conductivity profiles over depth in the sediment from two boreholes in Polar Fox Lagoon. https://doi.pangaea.de/10.1594/PANGAEA.907477