El Nino and La Nina

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Normal Conditions:

  • Southeast trade winds bring warm waterto the west pacific e.g Australia/Indonesia
  • Air rises in low pressure systems over west pacific near Australia/Indonesia
  • Walker Circulation cell
  • Ocean surface currents take warm water away from West and brings them to the east
  • Brings cold water up from below - upwelling of cold water in east pacific e.g. south America
  • Warm water accumulates…

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