How do oceanographers measure the sanity of ocean water?

Oceanographers measure the salinity of ocean water using various methods, including conductivity, temperature, and depth (CTD) sensors that collect data on the electrical conductivity of seawater. Since salinity affects conductivity, the sensors can determine salinity levels based on the conductivity readings. Additional methods include taking water samples for laboratory analysis or using refractometers, which measure the refraction of light in water to determine salinity. These measurements are crucial for understanding ocean circulation, climate, and marine ecosystems.