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g104_class16_ENSO

g104_class16_ENSO - Geography 104 El Nino Southern...

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El Nino – Southern Oscillation - Southern Oscillation (atmosphere) - El Nino (ocean) - change in equatorial Pacific circulation - produces global climate changes - can significantly alter weather in California Geography 104 - “Physical Geography of the World’s Oceans”
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Pacific Decadal Oscillation (PDO) variations in Pacific ocean climate on decadal scales
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El Nino – Southern Oscillation (ENSO) variations in Pacific ocean climate on few-year scales
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The Southern Oscillation Discovered in 1928 by Sir Gilbert Walker Proposes a zonal circulation cell over the equatorial Pacific Links changes to global climate
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Walker Circulation East-to-west pressure gradients drive trades
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Walker Circulation Vertical cell driven by warmest waters
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Southern Oscillation correlation coefficients are equal in magnitude, opposite in sign
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atmospheric pressure: Darwin vs. Tahiti
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Southern Oscillation Index SOI = Tahiti - Darwin air pressure Δ ’s Low SOI = El Niño conditions
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Southern Oscillation & warm water off S. America
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Multivariate ENSO Index Combines observations of air pressure, zonal & meridional components of wind, sea surface temperature, air temperature and total cloudiness.
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