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Assessing zooplankton advection in the Barents Sea using underway measurements and modelling

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The coastal shelf of northern Norway and the Barents Sea is highly advective and mainly affected by the North Atlantic Current and the Norwegian Coastal Current. The oceanographic conditions are an important factor for the spatial and temporal distribution of zooplankton in the region. To quantify zooplankton advection over the western border of the Barents Sea, a Scanfish/Optical Plankton Counter (OPC), Acoustic Doppler Current Profiler (ADCP), Multiple Opening and Closing Nets and Environmental Sampling System (MOCNESS) , and hydrodynamic model were used. This study provides data from two time windows (June and July 1998) by continuous measurements between northern Norway and Bear Island. The zooplankton community structure was obtained by net tows and zooplankton abundance fields were mapped by an OPC counting zooplankton in the size range 0.7–14 mm equivalent spherical diameter. A simple zooplankton community structure was found with the copepod Calanus finmarchicus (CIII–CV) as the dominant species in this size fraction. Ocean currents were measured by a ship-mounted ADCP and the residual currents were calculated by subtracting the tidal component obtained from a hydrodynamic model. Two measurements conducted in June and July 1998 shows a net eastward transport of water of 3.5 and 1.3 Sverdrup over the section. For the same two periods, zooplankton biomass transport is also positive towards east but varies by two orders of magnitude between the two measurements.
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Keywords: Acoustic Doppler Current Profiler; Barents Sea; Calanus finmarchicus; Optical Plankton Counter; advection; currents; hydrodynamic model; temperature

Document Type: Research Article

Affiliations: 1: SINTEF Civil and Environmental Engineering, Department of Coastal and Ocean Engineering, N-7934 Trondheim, Norway 2: Norwegian College of Fishery Science, University of Tromsø, N-9037 Tromsø, Norway 3: Geophysical Institute, University of Bergen, N-5020 Bergen, Norway

Publication date: 2003-03-01

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