E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Organic Geochemistry, Biogeochemistry, Formation of Oil and Gas Deposits|
|Published online||07 June 2019|
The evolution of the ecosystems of thermokarst lakes of the Bolshezemelskaya tundra in the context of climate change
N. Laverov Federal Center for Integrated Arctic Research, RAS, 23 Severnoi Dviny Emb., 119991 Arkhangelsk, Russia
2 Géosciences Environnement Toulouse (GET), UMR 5563, CNRS-OMP-Université Toulouse, 14 Avenue Edouard Belin, 31400 Toulouse, France
3 Tomsk branch of the Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS, 4 Avenue Akademichesky, 634055 Tomsk, Russia
4 BIO-GEO-CLIM Laboratory, Tomsk State University, 36 Avenue Lenina, 634050 Tomsk, Russia
* Corresponding author: IvanovaIS_1986@mail.ru
In the conditions of climate warming, the thawing of permafrost can provoke the formation of new thermokarst lakes and subsidence, which facilitates the removal of organic matter from thawed peat into natural waters. Hydrochemical studies of surface waters of the Bolshezemelskaya tundra have demonstrated the exponential dependence of the physicochemical parameters on the size of the water body (peat subsidence, thaw ponds, small lakes, thermokarst lakes). The hydrochemical features of thermokarst lakes of the Bolshezemelskaya tundra are determined by high content of DOC, surface runoff and the thickness of peat deposits. Measurements of concentrations and fluxes of methane showed that all studied water bodies of the Bolshezemelskaya tundra are oversaturated with CH4, and depressions, subsidence, and small water bodies (<100 m2) are characterized by the highest concentrations of DOCs. The contribution of these small reservoirs to the total coverage of the surface of the Bolshezemelskaya tundra area is significant, and their consideration can greatly change the assessment of methane fluxes from the arctic tundra.
© The Authors, published by EDP Sciences, 2019
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