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JANUARY 2023
FIGURE T2.
Three-month running mean of a
CDAS/Reanalysis-derived (a) Southern Oscillation Index (RSOI), (b)
standardized pressure anomalies near Tahiti (solid) and Darwin (dashed),
(c) an equatorial SOI ([EPAC] - [INDO]), and (d) standardized equatorial
pressure anomalies for (EPAC) (solid) and (INDO) (dashed). Anomalies are
departures from the 1991-2020 base period means and are normalized by
the mean annual standard deviation. The equatorial SOI is calculated as
the normalized difference between the standardized anomalies averaged
between 5N-5S, 80W-130W (EPAC) and 5N-5S, 90E-140E (INDO).
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