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The main features of the Walker Circulation in the tropical Pacific during ENSO-neutral conditions. On average, persistent convection and low surface pressure associated with rising branches of the Walker Circulation are found over the Maritime continent, northern South America, and eastern Africa. Subsidence (sinking air) and high pressure are found over the central tropical Pacific and to a lesser extent over the Middle East and Southwest Asia. NOAA Climate.gov drawing by Fiona Martin.