Atmospheric wavenumber-4 driven South Pacific marine heat waves and marine cool spells.

There is a significant trend towards longer-duration warm events (slope = 7 d decade −1 , r 2 = 0.3, p = 0.01), with the mean duration increasing from 8 d during the 1980s to 26 d during the 2010s, but there is no significant change in the duration of cool events (mean value = 12 d, p = 0.18).

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