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12 Cards in this Set
- Front
- Back
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how long do El Nino events last and how often do they occur?
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last 12-18 months and occur about 30 times per century
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what is the underlying cause of El Nino?
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we don't know
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how do El Nino weather conditions differ from normal conditions in Peru and Indonesia?
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Normal: low pressure system in Indonesia causes heavy percipitation; hihg pressure in Peru causes dry conditions; SE trade winds are normal and drive S Equatorial current, causing upwelling in Peru
El Nino: Pressure systems reverse, so dry conditions in Indonesia and wet conditions in Peru; reduced upwelling near Peru; SE trade winds weaken or reverse; a pool of warm surface water extedns across the equatorial pacific |
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How does El Nino affect weather conditions on the Western side of south america, especially Ecuador, Peru, and Bolivia?
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it causes wetter than normal conditions
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How does El Nino affect weatehr conditions in the Western Pacific, especially Indoniesia, parts of Australia, and East Africa and Northern Brazil?
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drought and forest fires are common
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How does El Nino affect upwelling in Peru?
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it reduces it, resulting in a negative impact on fish stocks
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How does El Nino afect the Atlantic hurricane season?
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the hurricane season is much quieter
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how does El Nino affect weather in the Western US?
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more storms and warmer weather
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how does El Nino affect the extent of sea ice around Antarctica?
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there is an increase in sea ice cover during El Nino
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how are the records of historical El Nino events preserved in trees?
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high rainfall caused excessive tree growth in one year, causing a wide ring in the wood
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T or F: El Nino events are associated with coral bleaching events
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T
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how does El Nino affect storms in the central pacific ocean?
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storms and waves become frequent and more violent
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