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• W2065677189 abstract "Seabed distributions of 234Th excess (Thxs) were determined in the upper centimetres of 38 sediment cores from the north-western Iberian Margin, sampled from 41–44°N and from 9–12°E during five OMEX II cruises. Three main areas, a northern, and at 42°38 and 42°N, were investigated during representative seasons (winter, spring and summer). Low 234Thxs activities in summer 1998 (18–252 Bq per kg) were similar to those measured in summer 1997. In winter 234Th also showed moderate excess. The highest values were observed in spring with surface 234Thxs values up to 402 Bq kg−1. Maximum penetration depths of 234Thxs ranged from a few mm to 3 cm. 234Thxs activities always showed a smooth decrease with depth, without any evidence of non-local mixing. Thus particle mixing on a short time scale can be described as an eddy diffusive process, and bioturbation rates, calculated on this basis, range from 0.02 to 3.07 cm2 per year. Data (activities, inventories, bioturbation rates) are discussed in order to relate the observed surface and down-core variations to spatial and seasonal trends. Using 234Thxs data in sediment as a substitute for sediment trap estimates, particle fluxes were calculated from 234Thxs inventories. The range of 234Th-derived particle fluxes for the north-western Iberian Margin is 16–1418 mg.m−2.d−1. Mean values indicate a gradual decrease of mass fluxes from the shelf to the open ocean. On a 100-day scale, the northern area (43–44°N) represents a low sedimentation regime. Further south, around 42°–43°N, particle inputs are more important. On the middle slope, around 1000 to 2000 m depth, high inventories and bioturbation rates indicate enhanced, and probably organic-rich, particle fluxes to the seafloor, particularly in spring." @default.
• W2065677189 created "2016-06-24" @default.
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• W2065677189 date "2002-01-01" @default.
• W2065677189 modified "2023-09-26" @default.
• W2065677189 title "Seasonal deposition and reworking at the sediment-water interface on the northwestern Iberian margin" @default.
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• W2065677189 doi "https://doi.org/10.1016/s0079-6611(02)00014-9" @default.
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