Aquatic Sciences Meeting, Albuquerque 2001

SS31 Integrated Approaches to Drainage Basin Nutrient Inputs and Inland/Coastal Eutrophication (Science and Society Connections)

Date: Thursday, February 15, 2001, Time: 2:00:00 PM

Location: Cimarron

Savchuk, O, P, Department of Systems Ecology, Stockholm University, Stockholm, Sweden, oleg@system.ecology.su.se

INTEGRATING DATA AND KNOWLEDGE WITH MODELS: THE BALTIC SEA EUTROPHICATION CASE

Dynamic simulation models with different complexity and resolutions in space and time are used as both an integrative platform to bring together the knowledge from different disciplines and a research tool to quantify nutrient cycles. These models describe coupled nitrogen, phosphorus, and silicon biogeochemical cycles in interacting pelagic and sediment sub-systems as driven by transport and translocation processes under external natural and anthropogenic forces. Being forced with- and compared to the best available data acquired within international projects (the Gulf of Finland Year, the Gulf of Riga Project, Baltic Sea System Studies), the models proved to be reliable enough to be used as a tool to study eutrophication mechanisms as well as possible consequences of the nutrient load reductions. The scenario simulations show that the effects of N vs. P reductions depend on the scales and locations. For the entire Baltic Proper the most effective was P reduction. In the eastern Gulf of Finland N reduction appeared more beneficial. In the Gulf of Riga a combined N+P reduction yielded larger response than either N or P reduction.

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Aquatic Sciences Meeting, Albuquerque 2001

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