Remobilization of Old Permafrost Carbon to Chukchi Sea Sediments During the End of the Last Deglaciation.

ABSTRACT: Climate warming is expected to destabilize permafrost carbon (PF-C) by thaw-erosion and deepening of the seasonally thawed active layer and thereby promote PF-C mineralization to CO₂ and CH₄. A similar PF-C remobilization might have contributed to the increase in atmospheric CO₂ during deglacial warming after the last glacial maximum. Using carbon isotopes and terrestrial biomarkers (Δ¹⁴C, δ¹³C, and lignin phenols), this study quantifies deposition of terrestrial carbon originating from permafrost in sediments from the Chukchi Sea (core SWERUS-L2-4-PC1). The sediment core reconstructs remobilization of permafrost carbon during the late Allerød warm period starting at 13,000 cal years before present (BP), the Younger Dryas, and the earl

SUBMITTER: Martens J 

PROVIDER: S-EPMC6472570 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature