Seasonal variation in vertical flux of biogenic matter in the marginal ice zone and the central Barents Sea

作者: Kalle Olli , Christian Wexels Riser , Paul Wassmann , Tatjana Ratkova , Elena Arashkevich

DOI: 10.1016/S0924-7963(02)00177-X

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摘要: The spatial and seasonal variations in the vertical flux of particulate biogenic matter were investigated Barents Sea winter spring 1998 summer 1999. Arrays simple cylindrical sediment traps moored for 24 h between 30 200 m along a transect from ice-free Atlantic water to Arctic with up 80% ice cover. Large gradients quantity composition sinking particles observed south–north direction, relation column structure stability, which depend on processes retreat. magnitude organic carbon (POC) out upper mixed layer ranged background values (30–70 mg C 2 day 1 ) 150–300 500–1500 spring. Vertical chlorophyll (CHL) was negligible winter, generally <1 summer, 38 In spring, proportion phytoplankton (dominated by Phaeocystis pouchetii Thalassiosira antarctica water) POC 50%. Both colonial single-celled forms P. equally abundant traps. contrast season, during dominated variety flagellates (e.g. small unidentified flagellates, Ochromonas crenata, Dinobryon balticum pouchetii). bottom comparable waters (ca. ), but C/N ratio different. regulation particle sedimentation took place layers over very short distances, varied season mass. mainly shaped stratification (strong salinity water; no also activity plankton organisms. Zooplankton faecal pellets an important constituent (up 250 their significance widely stations. daily loss rates exceeded average 1.7 times. complexity planktonic community suggested prevalence retention food chain higher capacity resource recycling compared D 2002 Elsevier Science B.V. All rights reserved.

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