||Basic Physical Concepts -- Turbulence Basics -- Similarity for the Ice/Ocean Boundary Layer -- Turbulence Scales for the Ice/Ocean Boundary Layer -- The Ice/Ocean Interface -- A Numerical Model for the Ice/Ocean Boundary Layer -- LTC Modeling Examples -- The Steady Local Turbulence Closure Model. At a time when the polar regions are undergoing rapid and unprecedented change, understanding exchanges of momentum, heat and salt at the ice-ocean interface is critical for realistically predicting the future state of sea ice. By offering a measurement platform largely unaffected by surface waves, drifting sea ice provides a unique laboratory for studying aspects of geophysical boundary layer flows that are extremely difficult to measure elsewhere. This book draws on both extensive observations and theoretical principles to develop a concise description of the impact of stress, rotation, and buoyancy on the turbulence scales that control exchanges between the atmosphere and underlying ocean when sea ice is present. Several interesting and unique observational data sets are used to illustrate different aspects of ice-ocean interaction ranging from the impact of salt on melting in the Greenland Sea marginal ice zone, to how nonlinearities in the equation of state for seawater affect mixing in the Weddell Sea. The book's content, developed from a series of lectures, may be appropriate additional material for upper-level undergraduates and first-year graduate students studying the geophysics of sea ice and planetary boundary layers. Miles McPhee performs geophysical research, focused on polar regions, both from McPhee Research Company and as affiliate principal scientist at the University of Washington Applied Physics Laboratory. He has participated in more that twenty field programs in the polar oceans of both hemispheres. Dr. McPhee also lectures on air-ice-sea interaction at the University Center on Svalbard.