THE WALKER CIRCULATION is an atmospheric system of air flow in the equatorial Pacific Ocean. The trade winds across the tropical Pacific flow from east to west: air rises above the warm waters of the western Pacific, flows eastward at high altitudes, and descends over the eastern Pacific.
https://www.climate-policy-watcher.org/global-climate-2/walker-circulation.html
diagrams help understand it too: https://www.google.com/search?q=walker+circulation&tbm=isch
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