= Ice layer between freshwater and cold brine
{title2=$a(t)=2A\sqrt{Dt},\quad b(t)=2B\sqrt{\kappa t}$}
In a planar no-flow model with pure <ice>, a stable cold brine below freshwater can support an <ice> layer whose upper <phase boundary> freezes freshwater while its lower boundary melts into diluted brine. <Heat conduction> and salt <diffusion> obey different similarity scales. Local <liquidus> equilibrium, salt conservation and two <Stefan conditions> determine both boundary positions. The heat lost into the brine supports net <ice> growth even while some basal <ice> melts.
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