---
title: "Ocean Salinity: Definition, Causes, Distribution"
description: "Ocean salinity measures dissolved salt in seawater, averaging 35 g/kg, and is crucial for understanding ocean dynamics and climate change impacts."
url: "https://modeldiplomat.com/learn/glossary/ocean-salinity"
---

[New](https://modeldiplomat.com/)

#

Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Ocean salinity is the measure of dissolved salt content in seawater, expressed in grams of salt per kilogram of water or practical salinity units.
- Why is the Arabian Sea saltier than the Bay of Bengal?
- What is the difference between salinity and the halocline?
- Why do subtropical regions have the highest open-ocean surface salinity?
- How does ocean salinity relate to thermohaline circulation?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Go beyond the definition

## Research Ocean Salinity like a delegate

Model Diplomat's AI drafts position papers, speeches, and country research with real sources — built for MUN and politics students.

## Research it like a delegate

Research on modeldiplomat.com

## Ask a follow-up about Ocean Salinity

Open a cited briefing in Model Diplomat search — timelines, positions, and sources you can use in committee or exam answers.

[Start research on Ocean Salinity](https://modeldiplomat.com/search?q=Explain%20Ocean%20Salinity%20%E2%80%94%20key%20dates%2C%20actors%2C%20positions%2C%20and%20sources)

Example

In 2011, NASA's Aquarius satellite produced the first global sea-surface salinity maps, confirming the Atlantic as the saltiest ocean basin and the subtropical gyres near 25°N and 25°S as the surface salinity maxima.

Keep learning

## Go deeper than the definition

[Explore all Civil Service & Diplomatic Exams lessons](https://modeldiplomat.com/learn/civil-services)[Test yourself with a quiz](https://modeldiplomat.com/learn/glossary/quiz/civil-services)

## Take Ocean Salinity beyond the glossary

Ask the AI research engine built for diplomacy — get briefings, position papers, and speeches with sources you can cite in committee.