Methane Emission from lakes on continuous and isolate permafrost in Russia

Greenhouse gases emission from lakes is quite significant environment question in the cryosphere. Up to know the volume of storage and reason that influence on it are underestimated. If GHG emission for the Arctic landscapes and boreal wetlands are measuring on seldom stations, data from permafrost border is insufficient.

There are continuous and isolated permafrost with many lakes in Russia. Emission from the surface of thermokarst and periglacial lakes were measured in Yamal peninsula and Tunkinskaya valley (the Russian Arctic and Baikal region) in summer 2022. Both regions have natural and anthropogenic changed aquatic ecosystems. Several geochemical, ecological and hydrodynamical features of lakes were consider as well.

CH₄ emission from thermokarst lake near Salekhard city was 237 mgCH₄·m^-2·day^-1 in site of volume for thermokarst lake Shorshonka in Tunkinskaya valley was more than 2000 mgCH4·m^-2·day^-1 (the air temperature was equal). Eutrophic lake near Tunkinskiye Goltsy Mountain Ridge gave 1020 mgCH₄·m^-2·day^-1 in summer period. Methane concentration in lake sediments was 2.1-8.3 µg/l for lakes in southern Yamal and reached 13.6 µg/l in Baikal region. Biogenic elements concentration in all lakes as usual was in the limit. Isotope content was also a little bit strange for Shorshonka lake (4.67 δ¹⁸O, ‰). Other lakes near Salekhard city and Baikal lake had amplitude 11-16 δ¹⁸O, ‰.   

Therefor we can tell about strong differences for methane emission from thermokarst lakes in continuous and isolated permafrost that flux should be studied more detail.