Which method of determining salinity is least likely to be used by current oceanographers? A. Determining salinity based on measurements of the chloride ion
B. Determining salinity based on refraction of light
C. Determining salinity based on satellite observations
D. Determining salinity based on electrical conductivity of seawater using a CTD

Refraction OF LIGHT

Explanation:

Salinity can be measured in various ways. Most oceanographers

measure salinity with an instrument called a CTD, named for the three

parameters it measures: conductivity, temperature, and density. To

determine salinity, probes on the CTD record electrical conductivity.

SOURCE OF ANSWER:

Desktop CTD instruments are also available, but when the

highest precision isn't necessary for lab settings, a much simpler tool

called a refractometer is used.

A refractometer measures salinity based on refraction. Refraction is the

bending of light that occurs within a water sample. Only a few drops of

water are placed under the light source of the handheld refractometer.

c.           is the correct answer