Cost-effective Versus Proportional Nutrient Load Reductions To The Baltic Sea: Spatial
Impact Analysis With A 3D-ecosystem Model
Author(s)
T. Neumann & G. Schernewski
Abstract
Cost-effective versus proportional nutrient load
reductions to the Baltic Sea: Spatial impact
analysis with a 3D-ecosystem model
T. Neumann & G. Schernewski
Baltic Sea Research Institute, Warnemunde, Germany
Abstract
A 3D-biochemical model of the Baltic Sea was deployed to investigate the ef-
fects of two different 50 % nitrogen and phosphorus load reductions scenarios on
the Baltic Sea. The first scenario, according to the Helsinki Commission, as-
sumed a proportional 50 % load reduction in all riparian countries. The second
was based on a cost-effective optimal approach by Gren [1], with significant re-
gional differences in load reduction. The comparative simulations covered a pe-
riod of 16 month (January 1980 - May 1981).
In the central Baltic Sea a 50 % load reduction caused a decrease in inorganic
nitrogen concentration by 39 % and inorganic phosphorus declined by 8.3 % in
the upper water layer (30 m). Chlorohyll-a, as an indicator for algae biomass,
was reduced by 9 %. The c
Keywords
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