Which mechanism alters surface salinity within subtropical gyres located far from landmasses?

💡 Explanation

When subtropical gyres experience net converging flow driven by differential Ekman transport, increased surface water accumulation amplifies evaporation because salinity rises at center due to greater evaporation rates within gyre interiors. Therefore, differential Ekman transport results, altering salinity distribution significantly, in contrast to upwelling discharge and ice impacting land processes.

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