The reason for more salinity of Tropical Ocean when compared to cold water is <u>rapid evaporation</u>.
<h2>Explanation:</h2>
The rate of evaporation is very high in case of Tropical Ocean than the cold water. Tropical seas receive more solar radiation consistently. The water present in tropical seas is warm, around 27°C (80.6ºF).
Due to this reason, the rate of evaporation is very high in which the salt at the end of evaporation remains in the ocean and leads to high salinity of the tropical ocean.
