Dresden 2011 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 1: Poster Session
UP 1.8: Poster
Dienstag, 15. März 2011, 18:30–20:30, P2
Brine channel formation by phase separation in sea ice — •Bernd Kutschan1, Silke Thoms2, Klaus Morawetz1,3, and Sibylle Gemming4 — 1Münster University of Applied Science, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — 2Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany — 3International Institute of Physics (IIP), Universidade Federal do Rio grande do Norte - UFRN, Brazil — 4Helmholtz-Zentrum Dresden-Rossendorf, PF 51 01 19, 01314 Dresden, Germany
The distribution of brine channels in sea ice is important as the natural habitat of psychrophilic microorganisms and influences the heat exchange between the ocean and the atmosphere. The brine channel formation in sea ice is driven by salinity exchange between both phases, ice and water. By a variation of the free energy functional maintaining the conservation of salinity, we deduce a coupled differential equation system, which describe the phase separation between liquid water with high salinity and the hexagonal ice phase with low salinity. These equations connecting the hydrodynamic equations with the statistical thermodynamics are solved numerically in one and two dimensions. In contrast to the Turing structures the resulting phase-field equations lead to more realistic structures of the brine channel texture.
B. Kutschan, K. Morawetz, and S. Gemming. Phys. Rev. E 81, 036106 (2010).