| Major Climate Variations Events |
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| q | Longer Time Scales |
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| Cooling
during the Little Ice Age (A.D. 1400-1900) |
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| Warming in the
twentieth century |
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| q | Decadal Time Scales Climate Variability |
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| Pacific Decadal
Oscillation (PDO) |
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| q | Interannual Time Scale Climate Variability |
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| El Nino Southern
Oscillation (ENSO) |
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| North Atlantic
Oscillation (NAO) |
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