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WEATHER
Lesson 2 - Page 6

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Does the atmosphere change first in an ENSO event and then change water temperature (ocean-air hypothesis) or does the water circulation change, causing the temperature to change thereby creating changing weather patterns (ocean-ocean hypothesis)? Unfortunately, physical oceanographers and meteorologists are still debating this. These two models try to explain why El Nino causes increased water temperatures off North America.

All scientists agree that El Nino does cause drastic changes in the biological community, but some scientists blame more disasters on El Nino than others. To resolve this debate scientists are still analyzing data. Understanding this cycle might give us warnings so we can expect an El Nino before it arrives. This can prepare countries to expect abnormal weather patterns. Already they have determined that stronger than average easterlies in the west equator at least 18 months, signals an approaching El Nino. Also sea level (the height of water is not all one level) is unusually higher in the west than in the east Pacific and a larger layer of warm water in the west Pacific warns oceanographers that an ENSO event is coming.


El Nino conditions
 


La Nina conditions

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