Important role of the ENSO combination mode in the maintenance of the anomalous anticyclone over the western North Pacific in boreal summer (IMAGE)
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Figure 1 (a) Regression of the winter SST (shading, unit: ℃) and 850 hPa winds (vectors, unit: m s-1) anomalies on the summer WNPAC index during 1979–1999. (b) as in (a), but in spring. (c) Same as in (a) but in summer. (d) (e) (f) are the same as (a) (b) (c) but for the 2000–2020 period. The blue and red boxes indicate the WNP region and the IO region, respectively. Stippling represents the precipitation anomalies exceeding the 90% confidence level and vectors with values exceeding the 90% confidence level are shown.
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