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English: Sea ice coverage for various model configurations and ocean salinities. Rows show the standard model with a fully coupled ocean-atmosphere, sea ice dynamics, and freezing point depression (“Full Physics”; top); a modified model configuration with ocean and sea ice dynamics but fixed freezing point for all salinities (“Fixed Freezing Point”; middle); and a slab ocean configuration lacking ocean and ice dynamics but including freezing point depression (“No dynamics”; bottom). Salinity differs between the columns, increasing from 20 (left) to 50 g/kg (right). Increasing salinity yields lower ice cover in all scenarios, but the effects are most pronounced in model scenarios that include both dynamical and thermodynamic effects.