Carbon emission from Western Siberian inland waters

Jan Karlsson (), Svetlana Serikova, Sergey N. Vorobyev, Gerard Rocher-Ros, Blaize Denfeld and Oleg S. Pokrovsky
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Jan Karlsson: Umeå University
Svetlana Serikova: Umeå University
Sergey N. Vorobyev: Tomsk State University
Gerard Rocher-Ros: Umeå University
Blaize Denfeld: Umeå University
Oleg S. Pokrovsky: Tomsk State University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract High-latitude regions play a key role in the carbon (C) cycle and climate system. An important question is the degree of mobilization and atmospheric release of vast soil C stocks, partly stored in permafrost, with amplified warming of these regions. A fraction of this C is exported to inland waters and emitted to the atmosphere, yet these losses are poorly constrained and seldom accounted for in assessments of high-latitude C balances. This is particularly relevant for Western Siberia, with its extensive peatland C stocks, which can be strongly sensitive to the ongoing changes in climate. Here we quantify C emission from inland waters, including the Ob’ River (Arctic’s largest watershed), across all permafrost zones of Western Siberia. We show that the inland water C emission is high (0.08–0.10 Pg C yr−1) and of major significance in the regional C cycle, largely exceeding (7–9 times) C export to the Arctic Ocean and reaching nearly half (35–50%) of the region’s land C uptake. This important role of C emission from inland waters highlights the need for coupled land–water studies to understand the contemporary C cycle and its response to warming.

Date: 2021
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DOI: 10.1038/s41467-021-21054-1

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