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(Table 2) Isotopic composition of ebullition gases and lake water from Beringian thermokarst lakes

Brosius, Laura Susan ; Walter Anthony, Katey M ; Grosse, Guido ; [et al.]

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Publication Date: 2023-07-01

Keywords: -; Alaska, USA; Area/locality; Carmacks_Yukon; Dawson_Yukon; Depth, bathymetric; Description; Event label; Fairbanks; MULT; Multiple investigations; Name; North_Seaw_Penins; Number; Yukon, Canada, North America; δ13C, carbon dioxide, aquatic; δ13C, carbon dioxide, standard deviation; δ13C, methane; δ13C, methane, standard deviation; δ18O, standard deviation; δ18O, water; δ Deuterium, methane; δ Deuterium, standard deviation; δ Deuterium, water

Type: Dataset

Format: text/tab-separated-values, 128 data points

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Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze? (2021)

Angelopoulos, Michael ; Overduin, Pier Paul ; Westermann, Sebastian ; [et al.]

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Publication Date: 2021-10-15

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.

Keywords: 551.48 ; thermokarst lake ; talik ; lagoon ; subsea permafrost ; salt diffusion ; Siberia

Language: English

Type: map

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