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The most active winter synoptic-scale wave patterns over South America are identified using an extended empirical orthogonal function (EEOF) technique and are physically diagnosed using composite methods. Results show that the leading modes of short timescale variability propagate along two main paths: over the subtropical jet latitudes (30S) and over the subpolar jet latitudes (60S). This research focuses on the subtropical mode and its evolution over South America.
Vera et al. (Fri,) studied this question.