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Sea ice exchanges dynamic and thermodynamic properties with the underlying ocean through a turbulent boundary layer where conditions at the upper surface are dictated by the interface between the solid and liquid phases of seawater, rather than a gas/liquid boundary. The ice/ocean boundary layer (IOBL) is examined from two perspectives. The first deals with momentum, heat, and salt transfer within the IOBL away from the immediate interface, including discussions of: (i) the impact of rotation; (ii) inertial oscillations; (iii) factors that determine scales of turbulence; and (iv) Rossby-similarity techniques for estimating ice/ocean momentum transfer. In the second, the thermodynamics of heat exchange at the immediate interface is investigated in terms of enthalpy and salt conservation within an infinitesimal control volume following the boundary, with emphasis on the turbulent thermal and haline exchange coefficients. Evidence is presented suggesting that double-diffusion is important when ice melts, but not during freezing.