1. El Nino Southern Oscillation
ENSO
El Nino Southern Oscillation

2. ENSO El Nino Southern Oscillation
Alternating pattern (oscillation) of prevailing wind patterns and oceanic temperatures in the Pacific Ocean between South America and Indonesia/ Australia

3. Normal Conditions Easterly Trade winds blow west (Walker Circulation)
As the wind moves across the water it causes the ocean water to cycle
This causes UPWELLING of nutrients
= Productivity = Fish

6. El Nino Year (every 3-7 years)
Easterly winds weaken
Warm western water moves east
Prevents upwelling
Results in strange weather patterns in USA
Wetter winter in California and South East
Drier and warmer in the upper mid west to north east

10. La Nina Stronger Easterly Trade Winds than normal
Results in cooler water temperatures and greater cycling of ocean water
Results in greater upwelling
Weather Patterns in US - Wetter North East - Drier and milder across most of central and southern US
- colder in the north east

14. Overall comparison