Dispersed ground ice of permafrost peatlands: Potential unaccounted carbon, nutrient and metal sources

Chemosphere
Artem G LimOleg S Pokrovsky

Abstract

The physical and chemical consequences of massive ground ice (wedges) melt upon permafrost thaw is one of the central issues of environmental research linked to climate warming in the Arctic. Little is known about the chemical properties of dispersed ground ice abundant throughout permafrost peatlands that can easily melt with increasing active layer thickness (ALT). This is especially pertinent in continental lowlands, that account for sizeable areas of the Arctic, and contain high amount of organic carbon in both solid (peat) and liquid (porewater) phases. Here we studied 8 peat cores (0-130 cm depth)-comprised of porewater from the active layer (0-45 cm) as well as ice dispersed in frozen peat (40-130 cm)-across a latitudinal profile of Western Siberia Lowland (WSL) extending from discontinuous into continuous permafrost zones. Dissolved Organic Carbon (DOC), alkali and alkaline-earth metals (Ca, Mg, Sr, Ba, Li, Rb, Cs), sulfate, phosphorus, some trace elements (Al, Fe, Mn, Zn, Ni, Co, V, As, Y, REE, Zr, Hf, U) were sizably [more than 3 times] enriched in peat ice compared to peat porewaters from the active layer. In most sampled cores, there was a local maximum of strong enrichment (up to factors between 14 and 58) in DOC, ...Continue Reading

References

Apr 10, 2015·Nature·E A G SchuurJ E Vonk
Oct 28, 2015·Proceedings of the National Academy of Sciences of the United States of America·Travis W DrakeRobert G Striegl
Jan 23, 2018·The Science of the Total Environment·Weihua WangJunming Hao
Mar 22, 2020·Nature Communications·Craig T ConnollyJames W McClelland
May 6, 2020·Nature Communications·Jan NitzbonJulia Boike

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Citations

Apr 17, 2021·Chemosphere·Dahédrey Payandi-RollandOleg S Pokrovsky
Aug 5, 2021·The Science of the Total Environment·Patrick T GauthierAnne Crémazy
Sep 25, 2021·Scientific Reports·Alexander PastukhovDmitry Kaverin

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