Burial and Origin of Permafrost‐Derived Carbon in the Nearshore Zone of the Southern Canadian Beaufort Sea

• Published in: Geophysical Research Letters
• Main Authors: Grotheer, H., Meyer, V., Riedel, T., Pfalz, G., Mathieu, :, Hefter, J., Gentz, T., Lantuit, H., Mollenhauer, G., Fritz, M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Zenodo 2020
• Subjects: permafrost; Beaufort Sea; Canada; organic carbon; coastal erosion; carbon sequestration; biomarker; Arctic nearshore zone; Herschel Island
• Online Access: https://doi.org/10.1029/2019GL085897

Detailed organic geochemical and carbon isotopic (δ13C and Δ14C) analyses are performed on permafrost deposits affected by coastal erosion (Herschel Island, Canadian Beaufort Sea) and adjacent marine sediments (Herschel Basin) to understand the fate of organic carbon in Arctic nearshore environments. We use an end‐member model based on the carbon isotopic composition of bulk organic matter to identify sources of organic carbon. Monte Carlo simulations are applied to quantify the contribution of coastal permafrost erosion to the sedimentary carbon budget. The models suggest that ~40% of all carbon released by local coastal permafrost erosion is efficiently trapped and sequestered in the nearshore zone. This highlights the importance of sedimentary traps in environments such as basins, lagoons, troughs, and canyons for the carbon sequestration in previously poorly investigated, nearshore areas.