Comparison between the SST anomaly precursor signals before forecast initialization and the atmospheric circulation fields during the third week after forecast initialization. (IMAGE)
Caption
Panels A–C show the SSTA precursor signals for the El Niño, La Niña-A and La Niña-B categories, respectively (unit: °C; averaged over the 7 days before forecast initialization). Panels D–F show the 500-hPa geopotential height anomalies (unit: gpm) superimposed with wave activity fluxes (arrows; unit: m2 s-2) during the third week after forecast initialization. The black dots indicate the anomalies that pass the 99% confidence level.
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