Abstract
Abstract Patterns of outgoing longwave radiation (OLR) have been analyzed over the tropical Indian and Pacific Oceans in order to identify the varying influence of their associated convective anomalies on the circulation at higher latitudes. Particular attention has been given to the changes related to El Nino–Southern Oscillation (ENSO) events. The two leading EOFs (emperical orthogonal functions) of monthly OLR anomaly patterns for the region between 20°N–20°S and 70°E–120°W, express complementary variations between centers located 1) near 170°W just south of the equator and over the Philippines, and 2) slightly south of the equator near 145°W and slightly north of the equator near 165°E. Cluster analysis over a smaller area between 10°S–10°N and 140°E–140°W has highlighted ENSO-related changes with two of the six clusters associated with “moderate” (EN) and “strong” (EN+) El Nino events, and a third including most La Nina (LN) events. The OLR anomaly patterns associated with the 1986/87 and 1991/92 war...
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