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Turbulent exchange coefficients for the ice/ocean interface in case of rapid melting
Author(s) -
Sirevaag Anders
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl036587
Subject(s) - sea ice , sea ice growth processes , geology , turbulence , heat flux , range (aeronautics) , flux (metallurgy) , lead (geology) , diffusion , arctic ice pack , atmospheric sciences , sea ice thickness , mechanics , climatology , thermodynamics , materials science , heat transfer , geomorphology , physics , metallurgy , composite material
In the marginal ice zones, drifting sea ice encounters large ocean heat fluxes and melting rates. However, as found from modelling studies and observations of ice melting, double diffusive effects at the ice/ocean interface limit the melting rates. In this paper, direct measurements of turbulent heat and salt fluxes from the marginal ice zone during rapid melting are presented. The strength of double diffusion is found to be significant and close to the range suggested from other studies. Calculated melting rates when double diffusive effects are present are compared to melting rates calculated from a traditional bulk parameterization of ocean heat flux for a range of temperatures and friction velocities often encountered within the marginal ice zones. This comparison shows that by ignoring double diffusive effects, melting rates are overestimated by several cm per day, which may have a significant impact on a predicted future ice cover.