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Compound-specific <sup>13</sup>C and <sup>14</sup>C compositions of diverse lipidbiomarkers (fatty acids, alkenones, hydrocarbons, sterols and fattyalcohols) were measured in sinking particulate matter collected in sedimenttraps and from underlying surface sediments in the Black Sea, the Arabian Seaand the Ross Sea. The goal was to develop a multiparameter approach toconstrain relative inputs of organic carbon (OC) from marine biomass,terrigenous vascular-plant and relict-kerogen sources. Using an isotope massbalance, we calculate that marine biomass in sediment trap material from theBlack Sea and Arabian Sea accounted for 66–100% of OC, with lowerterrigenous (3–8%) and relict (4–16%) contributions. Marinebiomass in sediments constituted lower proportions of OC (66–90%), withconsequentially higher proportions of terrigenous and relict carbon (3–17and 7–13%, respectively). Ross Sea data were insufficient to allowsimilar mass balance calculations. These results suggest that, whereasparticulate organic carbon is overwhelmingly marine in origin, pre-agedallochthonous terrigenous and relict OC become proportionally more importantin sediments, consistent with pre-aged OC being better preserved duringvertical transport to and burial at the seafloor than the upper-ocean-derivedmarine OC

Transfer of organic carbon through marine water columns to sediments – insights from stable and radiocarbon isotopes of lipid biomarkers