Thermodynamic calculations of ice production in the northern Baltic proper
Academic Article
Overview
Identity
Additional Document Info
Other
View All
Overview
abstract
In the preliminary part of this paper it shall be examined in how far ice information which was originally destinated for merchant shipping can be used for scientific purposes, especially for investigating ice volume changes of short time scale. The examination covers spatially the western part of the Gulf of Finland and the northern Baltic proper, and temporally the phase of ice growth of one of the coldest winters during the last decade, as an example. As a consequence of the heterogeneous ice data material and different analysis methods partially considerable deviations arise at definite constellations, especially at the rate of ice growth. In the main part of this examination ice production for the spatial and temporal scales mentioned above is calculated applying thermodynamic models. Application of the models of Maykut [1978;1982] and Leppranta [1983] under consideration of the specific conditions for the northern Baltic Sea yields different ice production, correspondent to the handling of the surface temperature of ice, snow and snow ice, respectively. By coupling the two models an improvement of the results is achieved, which can partially be verified by comparison with the analysis results. Sensitivity studies with respect to the simulations yield great differences arising from the modification of the snow thickness upon the ice and/or the heat flux from the sea. Furthermore, ice production shows larger dependencies on thermal conductivity of snow, sensible heat flux and longwave radiation. 1985 Deutsches Hydrographisches Institut.
