Water Transport and Water Retention in Five Connected Subbasins in the Baltic Sea: Simulations using a General Mass-Balance Modeling Approach for Salt and Substances
2010 (English)In: Journal of Coastal Research, ISSN 0749-0208, Vol. 26, no 2, 241-264 p.Article in journal (Refereed) Published
This work presents monthly budgets for water and salt in the Baltic Sea and its five main sub-basins, the Baltic Proper, the Bothnian Sea, the Bothnian Bay, the Gulf of Finland and the Gulf of Riga. This process-based mass-balance modeling uses empirical data (from HELCOM) for the period 1997 to 2005. Previous models of this kind generally use water temperature data to differentiate between different water layers. This model (CoastMab) uses sedimentological criteria related to the theoretical wave base to differentiate between vertical layers. CoastMab stems from a model development in aquatic radioecology and it has previously been validated for many different substances (radionuclides, metals, nutrients, suspended particulate matter and salt) for lakes and relatively small coastal areas but not for such a large and complex system of interconnected basins as the Baltic Sea. New morphometric data for the Baltic Sea and the defined sub-basins and new hypsographic and volume curves based on digitized bathymetric data are also presented and used in this work. The aim has been to present data on the fluxes of water to the system, precipitation and the theoretical retention times for water and salt in the defined sub-basins since those values give fundamental information on how the system reacts to changes in, e.g., nutrient loading. The idea with this modeling, and the results presented in this work, is that these water fluxes, water retention rates and the algorithms to quantify vertical mixing and diffusion should be structured in such a manner that the model also can be used to quantify fluxes of nutrients and toxins. This places certain demands on the structure of the model, which may be different from physical oceanographic models, e.g., in quantifying sedimentation, resuspension, mixing and diffusion and in the requirements regarding the accessibility of the necessary driving variables.
Place, publisher, year, edition, pages
2010. Vol. 26, no 2, 241-264 p.
salinity; Baltic Sea; transport processes; general mass-balance model; water retention time; water retention rate; water fluxes; mixing; diffusion
Other Earth and Related Environmental Sciences
Research subject Sedimentology
IdentifiersURN: urn:nbn:se:uu:diva-121354DOI: 10.2112/08-1082.1ISI: 000276328400005OAI: oai:DiVA.org:uu-121354DiVA: diva2:305002