idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
panel A depicts the normal weather situation. The equatorial Western Pacific surface waters have average temperature around 28 °C, which is four degrees higher than in the equatorial Eastern Pacific. Here the forces of the Humboldt Current coming from the South and the winds coming from the East interact and cause upwelling of cold deep water rich in nutrients. The temperature gradient establishes the Walker cell, a wind system across the Pacific Ocean. In the Western Pacific a low pressure (L) system builds up due to the rising of warm humid air. During the rise the air is cooled down and water condenses to form clouds which lead to rainfalls. On the other side of the South Pacific a high pressure system (H, anticyclone) forms. Dried air sinks down and strengthens the trade winds towards the low pressure system in the West.
Manfred Schloesser
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