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Eutrophication issues attacked by a numerical model of the North Sea/Skagerrak

Skogen, Morten D.; Søiland, Henrik; Svendsen, Einar
Working paper
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URI
http://hdl.handle.net/11250/100565
Date
2003
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Abstract
Several issues of eutrophication in the North Sea and Skagerrak have been attacked

using a three dimensional ecological model, NORWECOM. The focus have

been on two different years, 2000 and 2001, their characteristics and the differences

between them. The results show that the annual depth integrated primary production

in the whole North Sea is higher in 2001 than in 2000, but with large spatial

differences. In the North Sea an extreme oxygen minimum were found in 2000 south

of Dogger Bank that were not seen in 2001. Both the Atlantic inflow to the northern

North Sea and the inflow through the English Channel were lower in 2001 than in

2000. Estimates from a long term modeling experiment, rank the Atlantic inflow in

2001 among the lowest since 1955, and the English Channel net flow in 2000 as the

highest. The cross boundary flow of inorganic nitrogen from the German Bight to

the Skagerrak was 50% higher in 2000 than in 2001. An eutrophication assessment

from the modeled N/P ratio gives significant higher levels in 2000. The effect on

this level is also documented from a reduced input of inorganic nitrogen in the river

waters.
Publisher
ICES
Series
ICES CM documents
2003/P:06

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