What is Ocean Salinity?

By BYJU'S Exam Prep

Updated on: November 9th, 2023

Ocean Salinity is the amount of dissolved salt in saltwater. Mineral salts are dissolved in all natural streams, including ocean water and rain. It is calculated as the amount of salt dissolved in one kilogram of salt water, or 1,000 grams. It is usually expressed in parts per thousand (ppt). The salinity of saltwater is an important factor.

Ocean Salinity Definition

The salinity of seawater is expressed as a salt (in grams) to a liter of water ratio. Each liter of seawater contains around 35 grams of dissolved salts. It is written 35. The usual range of ocean salinity is 33-37 grams per liter (33%-37%). Usually, it is expressed in ppt or o/oo, or parts per thousand. One essential quality of seawater is its saltiness or salinity.

Influences on Ocean Salinity

Water density, temperature, and salinity are all related. The following processes impact the ocean’s surface layer’s salinity:

  • Evaporation
  • Precipitation

Significance of Ocean Salinity

  • The freshwater flow from rivers affects the surface salinity in coastal areas.
  • Ice freezing and melting impact the Polar area’s surface salinity.
  • The movement of water by the wind to other locations also impacts an area’s salinity.
  • Ocean currents cause fluctuations in salinity.
  • The salinity of water in a region is affected by changes in temperature or density.


What is Ocean Salinity?

The amount of salt dissolved in saltwater is measured as Ocean Salinity. All naturally formed streams, including ocean water and rainfall, contain dissolved mineral salts. It is computed as the quantity of salt (in gm) dissolved in 1,000 gm of saltwater, or one kilogram.

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