Seasonal variability of the long-chain alkenone flux and the effect on the U37k'-index in the Norwegian Sea

摘要: A seasonally-varying sedimentation pattern was observed for the alkenone flux measured with sediment traps in northern North Atlantic. In Norwegian Sea (traps were set at 500, 1000 and 3000 m) varied between 0.1 7.1 μg m−2 d−1 followed seasonal of bulk parameters. Maximum fluxes occurred from mid-October until mid-November also high May. surprising result that considerably higher particle m. For flux, highest additional input 250% during period when resuspension greatest summer. At Barents continental margin 1840 1950 follow parameters, a less visible signal distinct seasonality m trap. The total alkenones 0.8 144 0.5 31.0 Resuspension lateral advection contributed significantly to two near-bottom traps. Alkenone concentrations determined faecal pellets Appendicularia, ostracods euphausids selected samples site. (4% 24% total) 5 6 times depth than major part (77–78%) C37:3 reaching trap associated meso-zooplankton. Spatial temporal variations U37k′ signals observed, indicating imprint depends on origin transport pathway organic material. Strong deviations occur areas where nepheloid layers contribute particles long residence primary flux.