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GEO130 – OCEANOGRAPHY |
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El Niño Study Guide Updated 08.24.09 |
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Pacific Ocean Atmospheric Winds and Ocean Currents that play a role in El Niño - Southern Oscillation NE Trade Winds (N.Hemi) and SE Trade Winds (S.Hemi) translucent white |
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| Warm Phase | Cold Phase |
| Subtropical High Pressure Cell WEAK |
Subtropical High Pressure Cell STRONG |
| Trade Winds WEAK |
Trade Winds STRONG |
| Upwelling WEAK |
Upwelling STRONG |
| Sea Level Western Pacific FALLING |
Sea Level Western Pacific RISING |
| Equatorial Counter Current STRONG |
Equatorial Counter Current WEAK |
| Biological Impact Primary Productivity REDUCED WHY? |
Biological Impact Primary Productivity INCREASED WHY? |
| TYPICAL WARM EPISODES = "El Niño" | TYPICAL COLD EPISODES = "La Niña" |
| 1982 - 1983 Warm Episode | 1988 - 1989 Cold Episode |
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| 1997 - 1998 Warm Episode | 1998 - 1999 Cold Episode |
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| RAINFALL ANOMALIES 97-98 El Niño |  |
| SEA LEVEL CHANGES ENSO CYCLE |  |
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| Above: Cool Phase | Above: Warm Phase |
| World Impacts El Niño - Southern Oscillation NORTHERN WINTER | World Impacts El Niño - Southern Oscillation NORTHERN SUMMER |
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