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El Nino and La Nina

El Nino and La Nina. El Nino . El Nino refers to the irregular warming in the sea surface temperatures from the coasts of Peru and Ecuador to the equatorial central Pacific. El Nino is a disruption of the ocean-atmosphere system in the tropical Pacific ocean. El Nino.

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El Nino and La Nina

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  1. El Nino and La Nina

  2. El Nino • El Nino refers to the irregular warming in the sea surface temperatures from the coasts of Peru and Ecuador to the equatorial central Pacific. • El Nino is a disruption of the ocean-atmosphere system in the tropical Pacific ocean.

  3. El Nino • It has important consequences for weather around the globe. • This phenomenon is not totally predictable but on average occurs once every four years. • It usually lasts for about 18 months after it begins.

  4. El Nino effects • El Nino causes increased rainfall in the South and unseasonably warm weather in the North.

  5. Why does El Nino happen? • The Trade winds slow down in the Central and Western Pacific. • The colder water that the trade winds usually bring up, stays lower in the ocean. • This makes the sea surface temperatures stay high. • El Nino Years: 1902, 1905, 1911, 1914, 1918, 1923, 1925, 1930, 1932, 1939, 1941, 1951, 1953, 1957, 1965, 1969, 1972, 1976, 1982, 1986, 1991, 1994, 1997, 2002, 2006

  6. Normal year versus El Nino year

  7. El Nino year versus Normal year

  8. La Nina • La Niña is characterized by unusually cold ocean temperatures in the Equatorial Pacific. • La Niña tends to bring nearly opposite effects of El Niño to the United States — wetter and cooler than normal conditions across the north and dryer and warmer than normal conditions across much of the south. • La Niña (Cold) Phases: 1904, 1908, 1910, 1916, 1924, 1928, 1938, 1950, 1955, 1964, 1970, 1973, 1975, 1988, 1998, 2000

  9. Why does La Nina happen? • The Trade winds strengthen in the Central and Western Pacific. • The trade winds bring up more cold water. • This makes the sea surface temperatures stay cold.

  10. La Nina versus Normal year year

  11. When can we notice this? • The impacts of El Niño and La Niña at these latitudes are most clearly seen in wintertime.

  12. Why El Nino? • El Niño was originally recognized by fisherman off the coast of South America because of unusually warm water in the Pacific ocean, occurring near the beginning of the year. • Less fish • El Niño means The Little Boy or Christ child in Spanish. This name was used for the tendency of the phenomenon to arrive around Christmas.

  13. Why La Nina? • La Niña means The Little Girl. La Niña is sometimes called El Viejo, anti-El Niño, or simply "a cold event" or "a cold episode".

  14. El Nino vs La Nina

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