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Unformatted text preview: L15 Geol 107 9/28/2011 1 El Nio Southern Oscillation (ENSO) An ocean atmosphere phenomenon in the tropical Pacific with global in the tropical Pacific with global consequences. It is the leading cause of interannual climate variability on the planet What is El Nio? Peruvian fishermen noticed a periodic ocean warming El Nio because of its appearance around Christmas Problematic because it caused considerable reductions of anchovy fishery and seabird populations Conversely, Colder than normal conditions called La Nia NORMAL EQUATORIAL FLOW ECC NEC ECC SEC ECC ECC El Ni o Event What is ENSO? Now we call the whole ocean atmosphere phenomenon ENSO ENSO = El Nino Southern Oscillation ENSO = El Nino Southern Oscillation Term includes both the SST changes (El Nino, normal and La Nina conditions) and the atmospheric changes (Southern Oscillation) Southern Oscillation Index Sir Gilbert Walker L15 Geol 107 9/28/2011 2 Walker Circulation Walker Circulation overrides Hadley...
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- Spring '11