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What happened in 1982 El Nino?

What happened in 1982 El Nino?. Mehmet ILICAK RSMAS, University of Miami 2005. Outline. What is El Nino? Why 1982? Oceanographic Events Meteorological Events Summary. What is El Nino?. major temperature fluctuations in surface waters of the tropical Eastern Pacific Ocean .

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What happened in 1982 El Nino?

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  1. What happened in 1982 El Nino? Mehmet ILICAK RSMAS, University of Miami 2005

  2. Outline • What is El Nino? • Why 1982? • Oceanographic Events • Meteorological Events • Summary

  3. What is El Nino? • major temperature fluctuations in surface waters of the tropical Eastern Pacific Ocean. • Non-El Nino conditions the trade winds blow towards the west across the tropical Pacific. • During El Nino, the trade winds relax in the central and western Pacific leading to a depression of the thermocline in the eastern Pacific, and an elevation of the thermocline in the west.

  4. Why 1982 El Nino? • The strongest and most devastating of the century. • 2,000 deaths. • $13 billion in damage to property and livelihoods.

  5. Oceanographic Events • The Annual Cycle in the Tropical Pacific • The Canonical El Nino • Theory • 1982-1983 El Nino “Oceanographic Events during El Nino”, Mark A. Cane

  6. Standard El Nino Phases • Prelude: Strong easterlies, high sea level, deep thermocline. • Onset: East trade winds begin to diminish • Event: Warming the South Coast of America, westerly winds, high sea level • Mature Phase: Another warming in December, trade winds become normal

  7. Theory

  8. 1982-1983 El Nino • West coast sea level decreased in April and continued to drop throughout the year. • East Coast Islands sea level increased 25cm instead of 10cm.

  9. SST Anomalies

  10. Meteorological Aspects of El Nino • In normal conditions, Walker Circulation

  11. Typical El Nino vs. 1982 El Nino Atm. Conditions after the peak of Typical El Nino 1982 El Nino Atm. Conditions

  12. Possible reasons of 1982 El Nino • Swing in the Southern Oscillation • El Chichon eruption • The El Chichon eruption of 6th April 1982 was powerful enough to eject aerosols and dust particles into the stratosphere, resulting in greater scattering and reflection of incoming sunlight, thus dampening the warming effect of El Niño.

  13. December 1982-February SST & SST Anomalies

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