Question

There is a higher salinity in the northern Red sea while lower in the southern

Answer 1

The Red Sea is one of the saltiest bodies of water in the world, owing to high evaporation. Salinity ranges from between 36% in the southern part because of the effect of the Gulf of Aden water and reaches 41 % in the northern part, owing mainly to the Gulf of Suez and the high evaporation. The average salinity is 40%.(Average salinity for the world's seawater  is 35 ‰ on the Practical Salinity Scale, or PPS; that translates to 3.5% actual dissolved salts.)

The salinity of the Red Sea is greater than the world average, approximately 4 percent. This is due to several factors:

High rate of evaporation and very little precipitation.Lack of significant rivers or streams draining into the sea.Limited connection with the Indian Ocean, which has lower water salinity.