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point in the water where the temperature drops considerably as depth increases |
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point in the water where the salinity increases considerably as depth increases |
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-west coasts of continents have light, cold, O2 and nutrient rich water and increased productivity -tradewinds move away from continents |
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cold water moves up to replace the water lost (ie. Peru) |
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-natural phenomenon -about an 8 year cycle -water level becomes high on west coasts and downwelling occurs (ie. in Peru) |
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-occurred in 1997/1998 -2100 people died -$33x10^9 damage -the first one to be predicted
normal Brazil year crops: 650,000 tons unpredicted year crops: 100,000 tons predicted year crops: 530,000 tons |
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