First-year sea ice is ice that has formed since the preceding summer melt season and has not yet survived a summer. It is usually thinner than older ice, although deformation can create thick sea-ice pressure ridges in a young cover.
Congelation ice grows by freezing onto the underside of an existing sheet. Competitive growth selects grains whose fast basal-plane growth can advance downward, yielding columnar sea-ice crystal fabric with brine-bearing intergranular regions.
// Target: geophysics.bigb
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