Author(s): Annu Oikkonen; Matti Lepparanta
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Abstract: Ice - ocean boundary layer is studied basing on the turbulence measurements of velocity, temperature and salinity under the drifting ice in the Baltic Sea during the winter 2009 and 2010. In March 2009 data were collected in the Bay of Bothnia and in March 2010 in the eastern Gulf of Finland. Measurements were made under very different drifting conditions, covering nearly still and very compact ice field, ice field under high deformation rate as well as the case of nearly free drift. Ice – ocean interaction is studied by calculating heat, salinity and momentum fluxes and their diurnal variations as well as differences caused by varying drifting conditions. An objective is to estimate the undersurface roughness characteriz ing the drift ice in the Baltic Sea. The goal is also to approximate the mixing length and eddy viscosity from the peak of the weighted vertical velocity spectrum as well as their variation under different ice drift conditions.
Year: 2010