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Burial and Origin of Permafrost‐Derived Carbon in the Nearshore Zone of the Southern Canadian Beaufort Sea
Author(s) -
Grotheer H.,
Meyer V.,
Riedel T.,
Pfalz G.,
Mathieu L.,
Hefter J.,
Gentz T.,
Lantuit H.,
Mollenhauer G.,
Fritz M.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl085897
Subject(s) - permafrost , geology , arctic , oceanography , total organic carbon , sedimentary rock , earth science , organic matter , erosion , coastal erosion , carbon fibers , environmental science , geomorphology , paleontology , ecology , composite number , composite material , biology , materials science
Detailed organic geochemical and carbon isotopic (δ 13 C and Δ 14 C) 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.