Dissolved Organic Matter Controls Seasonal and Spatial Selenium Concentration Variability in Thaw Lakes across a Permafrost Gradient

Environmental Science & Technology
Oleg S PokrovskyDavid Amouroux

Abstract

Little is known about the sources and processing of selenium, an important toxicant and essential micronutrient, within boreal and sub-arctic environments. Upon climate warming and permafrost thaw, the behavior of Se in northern peatlands becomes an issue of major concern, because a sizable amount of Se can be emitted to the atmosphere from thawing soils and inland water surfaces and exported to downstream waters, thus impacting the Arctic biota. Working toward providing a first-order assessment of spatial and temporal variation of Se concentration in thermokarst waters of the largest frozen peatland in the world, we sampled thaw lakes and rivers across a 750-km latitudinal profile. This profile covered sporadic, discontinuous, and continuous permafrost regions of western Siberia Lowland (WSL), where we measured dissolved (<0.45 μm) Se concentration during spring (June), summer (August), and autumn (September). We found maximum Se concentration in the discontinuous permafrost zone. Considering all sampled lakes, Se exhibited linear relationship ( R2 = 0.7 to 0.9, p < 0.05, n ≈ 70) with dissolved organic carbon (DOC) concentration during summer and autumn. Across the permafrost gradient, the lakes in discontinuous permafrost reg...Continue Reading

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Citations

Jan 18, 2021·The Science of the Total Environment·Yan ChangMeng Zhou
Apr 11, 2021·The Science of the Total Environment·Liudmila S ShirokovaOleg S Pokrovsky
Jan 15, 2020·Environmental Science & Technology·Zhineng HaoGuibin Jiang
Jan 27, 2022·Environmental Science. Processes & Impacts·Maïté BuenoDavid Amouroux

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