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Carbon emission from Western Siberian inland waters

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.
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Submitted on : Saturday, May 7, 2022 - 8:07:14 AM
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Jan Karlsson, Svetlana Serikova, Sergey N. Vorobyev, Gerard Rocher-Ros, Blaize Denfeld, et al.. Carbon emission from Western Siberian inland waters. Nature Communications, Nature Publishing Group, 2021, 12, ⟨10.1038/s41467-021-21054-1⟩. ⟨insu-03661479⟩



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