Preferential burial of permafrost‐derived organic carbon in Siberian‐Arctic shelf waters
作者： Jorien E. Vonk , Igor P. Semiletov , Oleg V. Dudarev , Timothy I. Eglinton , August Andersson
DOI: 10.1002/2014JC010261
关键词:
摘要: The rapidly changing East Siberian Arctic Shelf (ESAS) receives large amounts of terrestrial organic carbon (OC) from coastal erosion and Russian-Arctic rivers. Climate warming increases thawing Ice Complex Deposits (ICD) can change both the amount released OC, as well its propensity to be converted greenhouse gases (fueling further global warming) or buried in sediments. This study aimed unravel susceptibility degradation, transport dispersal patterns OC delivered ESAS. Bulk molecular radiocarbon analyses on surface particulate matter (PM), sinking PM underlying sediments illustrate active release old permafrost. Molecular tracers for recalcitrant soil showed ages 3.4–13 14C-ky 5.5–18 age difference these markers between is larger (i) regions with low accumulation rates, suggesting a weaker exchange water column sediments, (ii) increasing distance Lena River, preferential settling fluvially derived nearshore. A dual-carbon end-member mixing model that contemporary dispersed mainly by horizontal while being subject marine most affected vertical also actively degraded column, (iii) ICD settles dominates Preferential burial ICD-OC into ESAS waters might therefore lower suggested cycle climate feedback
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