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A comparison of rainfall variability in the semi-arid Brazilian Nordeste in observations and in two sets of model simulations leads to the conclusion that the evolving interaction between Tropical Atlantic Variability (TAV) and the El Nio-Southern Oscillation (ENSO) phenomenon can explain two puzzling features of ENSOs impact on the Nordeste: (1) the event-to-event unpredictability of ENSOs impact;...
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