ocean: Thermohaline Circulation

Thermohaline circulation refers to the deepwater circulation of the oceans and is primarily caused by differences in density between the waters of different regions. It is mainly a convection process where cold, dense water formed in the polar regions sinks and flows slowly toward the equator. Most of the deep water acquires its characteristics in the Antarctic region and in the Norwegian Sea. Antarctic bottom water is the densest and coldest water in the ocean depths. It forms and sinks just off the continental slope of Antarctica and drifts slowly along the bottom as far as the middle North Atlantic Ocean, where it merges with other water. The circulation of ocean waters is vitally important in dispersing heat energy around the globe. In general, heat flows toward the poles in the surface currents, while the displaced cold water flows toward the equator in deeper ocean layers.

Sections in this article:

• Introduction
• Importance of the Ocean
• The Pelagic Realm
• The Benthic Realm
• The Ocean as a Biological Environment
• Thermohaline Circulation
• Surface Circulation
• Relationship of the Ocean and the Atmosphere
• Trenches, Plains, and Ridges
• Continental Shelves, Slopes, and Rises
• The World Ocean
• Bibliography

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