Multi-year La Niña events—so-called "double-dip" or even "triple-dip" La Niñas—are becoming more common. But why do these events persist for multiple years in the first place?
Multi-year La Niña events—so-called "double-dip" or even "triple-dip" La Niñas—are becoming more common. But why do these events persist for multiple years in the first place?