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Explain El Nino and the La Nina weather phenomenon Walker Circulation In a normal year the South East trade winds from the global circulation, blow from East to West creating the following conditions: * Warm surface waters from the Pacific are blown Westwards, creating warm water near Australasia. * The warm water heats the air in the Western Pacific this intern creates thunderstorms and convection activity. * In the Eastern Pacific the removal of warm surface water, which has been blown westward allows cooler water to rise. * Cool upwelling water near Peru creates higher air pressures on the coast of Peru, re-enforcing the trade wind circulation. The upwelling water is high in nutrients meaning that fish are plentiful. Therefore helping the local fishing industries. * The high pressure caused by the trade winds means that the sea levels in Australasia are about half a metre higher than Peru and sea temperatures 8°c...

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