Circum-Arctic release of terrestrial carbon varies between regions and sources

Jannik Martens, Birgit Wild, Igor Semiletov, Oleg V. Dudarev and Örjan Gustafsson ()
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Jannik Martens: Stockholm University
Birgit Wild: Stockholm University
Igor Semiletov: Il’ichov Pacific Oceanological Institute FEB RAS
Oleg V. Dudarev: Il’ichov Pacific Oceanological Institute FEB RAS
Örjan Gustafsson: Stockholm University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Arctic change is expected to destabilize terrestrial carbon (terrOC) in soils and permafrost, leading to fluvial release, greenhouse gas emission and climate feedback. However, landscape heterogeneity and location-specific observations complicate large-scale assessments of terrOC mobilization. Here we reveal differences in terrOC release, deduced from the Circum-Arctic Sediment Carbon Database (CASCADE) using source-diagnostic (δ13C-Δ14C) and carbon accumulation data. The results show five-times larger terrOC release from the Eurasian than from the American Arctic. Most of the circum-Arctic terrOC originates from near-surface soils (61%); 30% stems from Pleistocene-age permafrost. TerrOC translocation, relative to land-based terrOC stocks, varies by a factor of five between circum-Arctic regions. Shelf seas with higher relative terrOC translocation follow the spatial pattern of recent Arctic warming, while such with lower translocation reflect long-distance lateral transport with efficient remineralization of terrOC. This study provides a receptor-based perspective for how terrOC release varies across the circum-Arctic.

Date: 2022
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DOI: 10.1038/s41467-022-33541-0

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