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ICES Journal of Marine Science: Journal du Conseil 1998 55(4):574-580; doi:10.1006/jmsc.1998.0402
© 1998 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Estimation of new production in the North Sea: consequences for temporal and spatial variability of phytoplankton

Katherine Richardson and Flemming Bo Pedersen

Department of Marine Ecology, Århus University Finlandsgade 14, DK-8200, Aring;rhus, Denmark
ISVA, Technical University of Denmark Building 115, DK-2800, Lyngby, Denmark

Correspondence to K. Richardson: tel: +45 89 424380; fax: +45 89 424387; e-mail: richardson{at}biology.aau.dk

By coupling knowledge of oceanographic processes and phytoplankton responses to light and nutrient availability, we estimate a total potential new production for the North Sea of approximately 15.6 x 106 t C year–1. In a typical year, about 40% of this production will be associated with the spring bloom in the surface waters of the seasonally stratified central and northern regions. About 40% is predicted to occur in the coastal waters while the remaining new production is predicted to take place in subsurface chlorophyll peaks occurring in association with fronts during summer months. By considering inter-annual variation in heat, wind, and nutrient availability (light and tidal energy input are treated as non-varying from year to year), the inter-annual variability in the new production in different regions is estimated. The analysis indicates that new production in the coastal waters may have increased by about 25% in recent decades.

Keywords: fronts, inter-annual variability, new production, North Sea, nutrient availability, total production, seasonal stratification, spring bloom, subsurface chlorophyll peaks


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