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Organic carbon (OC) and n -alkanes were investigated in the suspended matter (SM) and surficial sediments of the Arctic Ob and Yenisei Rivers and the adjacent Kara Sea. Organic nitrogen and δ 13 C values were determined as additional parameters in the sediments. OC and n -alkane concentrations were highly variable in space. This variability was interpreted as the result of a complex sedimentation pattern involving the discharges of these two rivers and the seasonal occurrence of a shore-ice front along the coast. Using the constant ratio of high molecular weight odd n -alkanes to OC in both rivers, we estimated that more than 70% of the OC preserved in shelf sediments is terrestrially-derived. This result was substantiated by the overall dominance of land-derived n -alkanes. A second approach using δ 13 C values and assuming binary dilution of riverine and marine OC led to comparable estimates.

The importance of terrestrial organic carbon inputs on Kara Sea shelves as revealed by n-alkanes, OC and δ13C values