Spatial heterogeneity of sedimentary organic carbon accumulation and degradation along the Arctic continental margins ...

• Main Author: sun, yifang
• Format: Dataset
• Language: unknown
• Published: Mendeley Data 2024
• Subjects: Sedimentation; Carbon; Arctic Sea; Lignin; Arctic; Arctic Ocean; permafrost
• Online Access: https://dx.doi.org/10.17632/29gycgdhc2; https://data.mendeley.com/datasets/29gycgdhc2

The warming climate has led to the translocation of a large amount of terrestrial organic carbon (TerrOC) from permafrost into the Arctic Ocean through river transport and coastal erosion. The fate of sedimentary organic carbon (SOC) varies dramatically and thus affects climate-carbon feedback. We analyzed the spatial heterogeneity of SOC sources and degradation along the East Siberian Arctic Shelf (ESAS) with bulk parameters (total organic carbon, δ13C) and a biomarker (lignin) for comparison of the spatial heterogeneity of TerrOC degradation between the broad ESAS and the narrow Amerasian continental shelf. The results show that the relative importance of river runoff, coastal erosion, and primary productivity causes alongshore variations in organic carbon (OC) sources within the ESAS, highlighting the effects of land-based inputs and ocean currents. Meanwhile, the variations of OC sources show gradually diminishing terrestrial signals in the seaward direction. The simultaneous offshore decrease in OC ...