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The Cryosphere An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Special issue editorial
16 Mar 2017
Review status
This discussion paper is under review for the journal The Cryosphere (TC).
Discovery and characterization of submarine groundwater discharge in the Siberian Arctic seas: A case study in Buor-Khaya Gulf, Laptev Sea
Alexander N. Charkin1,2, Michiel Rutgers van der Loeff3, Natalia E. Shakhova2,4, Örjan Gustafsson5,6, Oleg V. Dudarev1,2, Maxim S. Cherepnev2, Anatoly N. Salyuk1, Andrey V. Koshurnikov7, Eduard A. Spivak1, Alexey Y. Gunar7, and Igor P. Semiletov1,2,4 1Pacific Oceanological Institute (POI), Far Eastern Branch of Russian Academy of Sciences Russian Academy of Sciences (FEBRAS) , Vladivostok, Russia
2National Research Tomsk Polytechnic University, Russia
3Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
4International Arctic Research Center (IARC), University of Alaska, Fairbanks, USA
5Dept. of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden
6The Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
7Moscow State University, Russia
Abstract. It has been suggested that increasing freshwater discharge to the Arctic Ocean may also occur as submarine groundwater discharge (SGD), yet there are no direct observations of this phenomenon in the Arctic shelf seas. This study tests the hypothesis that SGD does exist in the Siberian-Arctic shelf seas but its dynamics may be largely controlled by complicated geocryological conditions such as permafrost. The field-observational approach in the southeast Laptev Sea used a combination of hydrological (temperature, salinity), geological (bottom sediment drilling, geoelectric surveys) and geochemical (224Ra, 223Ra and 222Rn) techniques. Active SGD was documented in the vicinity of the Lena River delta with two different operational modes. In the first system, groundwater discharges through tectonogenic permafrost talik zones was registered in both wintertime and summertime seasons. The second SGD mechanism was cryogenic squeezing out of brine and water-soluble salts detected on the periphery of ice hummocks in the wintertime season. The proposed mechanisms of groundwater transport and discharge in the arctic land-shelf system is elaborated. Through salinity versus 224Ra and 224Ra/223Ra diagrams, the three main SGD-influenced water masses were identified and their end-member composition was constrained. Further studies should apply these techniques to a broader scale with the objective to reach an estimate of the relative importance of the SGD transport vector relative to surface freshwater discharge for both the water balance and aquatic components such as dissolved organic carbon, carbon dioxide, methane, and nutrients.

Citation: Charkin, A. N., Rutgers van der Loeff, M., Shakhova, N. E., Gustafsson, Ö., Dudarev, O. V., Cherepnev, M. S., Salyuk, A. N., Koshurnikov, A. V., Spivak, E. A., Gunar, A. Y., and Semiletov, I. P.: Discovery and characterization of submarine groundwater discharge in the Siberian Arctic seas: A case study in Buor-Khaya Gulf, Laptev Sea, The Cryosphere Discuss., doi:10.5194/tc-2017-33, in review, 2017.
Alexander N. Charkin et al.
Alexander N. Charkin et al.
Alexander N. Charkin et al.


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