Sea-surface salinity, the concentration of dissolved salts in the upper layer of the ocean, is much more than a measure of how salty the sea is. It responds rapidly to changes in rainfall, evaporation, river discharge and, specifically in polar regions, the melting and formation of sea ice. Sal...

Source: [Phys.org](https://phys.org/news/2026-07-smos-mission-early-indicator-el.html)

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