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The Walker circulation determines much of the tropical Indo-Pacific climate and has a global impact as seen in the floods and droughts spawned by the El Niño-Southern Oscillation. Meteorological observations over the last 60 years show this atmospheric circulation has slowed: the trade winds have weakened and rainfall has shifted eastward toward the central Pacific. The immediate cause of this slowdown has puzzled climate scientists. A breakthrough is now reported in a new study. [Source: EurekaAlert!]
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