9. ENSO - ENSO El Nio- Southern Oscillation El Nio-...

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ENSO El Niño- Southern Oscillation
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El Niño- Southern Oscillation (ENSO) Interactions, inter-relationships between: Atmospheric circulation Ocean circulation Climate El Niño- oceanic component Southern Oscillation- atmospheric component
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ENSO El Niño Named for anomalous warm current off Peru Tends to occur around Christmas time Intensity and duration - variable
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ENSO Southern Oscillation Oscillation is the distribution and intensity of high and low pressure systems across the equatorial Pacific Affects wind patterns Affects surface ocean circulation patterns Affects climate
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Western Pacific Warm Pool
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East Pacific High Indonesian Low KKC 5-19 January
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ENSO E l N ino- S outhern O scillation Name given to a series of conditions that focus on processes in the Equatorial Pacific, but have global consequences
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Atmospheric Circulation - Eq Pac Walker Cell East to west atmospheric circulation cell Superimposed on the Hadley cell Similar to Hadley cell, but follows lines of latitude instead of lines of longitude
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Walker cell Normally initiated at the Indonesian Low Indonesian Low Low pressure system near Indonesia/Australia Overlying the western Pacific warm pool Atmospheric Circulation - Eq Pac
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East Pacific High Indonesian Low KKC 5-19 January
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Walker Cell KKC 15-12 Darwin Indonesian Low Tahiti East Pac High
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Walker Cell Air rises over Indonesian Low Transported to the east aloft Sinks in eastern equatorial Pacific (at high pressure) Transported to west at ground level = Trade winds Discovered by British mathematician in 1900’s studying failure of the Indian monsoon
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Normal Conditions From NOAA website (see KKC 15-13a) = Walker cell
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Low Pressure over Indonesia High Pressure over eastern equatorial Pacific Strong Walker cell Strong Trade winds Weak Equatorial Counter Current Upwelling near Peru Western Pac ~8 warmer than eastern Pac Sea surface about 0.5 m higher near Indonesia
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This note was uploaded on 07/08/2011 for the course GLY 3074 taught by Professor Ellenmartin during the Spring '09 term at University of Florida.

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9. ENSO - ENSO El Nio- Southern Oscillation El Nio-...

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