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Climate Change - Macro Scale. What is the Walker Cell?
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Climate Change - Macro Scale What is the Walker Cell? This is the normal atmospheric conditions in the Pacific Ocean. The great NE and SE trade wind belts blow equatorward and westward across the width of the Pacific towards the warm water of the west. A convectional uplift occurs as the water heats up. Pressure rises over the eastern Pacific Ocean, off the coast of South America, and falls over the western Pacific Ocean, toward Indonesia and the Philippines. The descending air in the east gives the clear, dry conditions that create the Atacama Desert in Peru, whilst the warm, moist air ascending in the west gives heavy convectional rainfall. What are the atmospheric conditions in an El Nino year? During an El Nino year the normal conditions are reversed in the equatorial Pacific region, in pressure, precipitation and often in winds and ocean currents. Pressure rises over the western Pacific and falls...
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