Indian Ocean Dipole

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What Wikipedia says

The Indian Ocean Dipole (IOD) is an irregular oscillation of sea surface temperatures in which the western Indian Ocean becomes alternately warmer (positive phase) and then colder (negative phase) than the eastern part of the ocean.

Excerpt from the Wikipedia article “Indian Ocean Dipole”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Image based on data from the IRI/LDEO Climate Data Library, Public domain, via Wikimedia Commons.