Angelopoulos, Michael

Grigoriev, Mikhail N.

Grosse, Guido

Overduin, Paul

Westermann, Sebastian

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Michael Angelopoulos1,2, Pier Paul Overduin1, Mikhail Grigoriev3, Sebastian Westermann4, Guido Grosse1,2Geophysical surveys of sub-aquatic permafrost: talik dynamics and the influence of saltwaterCryoGRID Reference:Westermann, S., Schuler, T. V., Gisnås, K., & Etzelmüller, B. (2013). Transient thermal modeling of permafrost conditions in Southern Norway. The Cryosphere, 7(2), 719.POTSDAMTelegrafenberg A4314473 Potsdam+49 331 288-2173michael.angelopoulos@awi.dewww.awi.de1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany2Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany3Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia4Department of Geosciences, University of Oslo, Oslo, NorwayThermal Modelling Workshop Lead: Dr. Moritz Langer (AWI)(CLM, WRF-NOAA, Flake, and CryoGRID)Berlin, GermanyNovember 26-28, 2017CryoGRIDFreezing point derived from electrical conductivity of porewater.Noe that borehole soil descriptions are preliminary and subject to change upon sample return and laboratory work.Lake/Lagoon IceWaterClaySiltSandFrozen SiltFrozen SandGoltsovoe LakeTemperature (°C)Polar Fox LakeTemperature (°C)                           Uomullykh Lagoon Temperature  (°C)Goltsovoe LakeUomullyakh LagoonPolar Fox LakeBorehole & Temperature ChainWaterSuspected salt diffusion layerNon-salty permafrost TalikSE-NW Electrical Resistivity Profile at Polar Fox Lake (24.07.2017)Scientific Hypotheses1) After a freshwater lake transforms into a saltwater lake, the underlying talik refreezes below a salty zone in shallow bathymetric areas.2) After a freshwater lake transforms into a saltwater lake, the underlying talik is subject to deep seasonal freezing and potentially very slow permafrost formation in the lake centre where no grounded ice occurs.CryoGRID Modelling of Freshwater Talik Submerged by Saltwater at Polar Fox LakeGrounded Ice Zone (1.2m Depth) – Yearly Model Outputs Every August 1st Lake Centre (3m Depth) – Yearly Model Outputs Every April 24th SE-NW ERT Profile (See Below)Month Month

Geophysical surveys of sub-aquatic permafrost: talik dynamics and the influence of saltwater

http://epic.awi.de/46231/1/CRYOGRID_MAngelopoulos_2511102017.pdf

Geophysical surveys of sub-aquatic permafrost: talik dynamics and the influence of saltwater

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