The leading tropical multidecadal mode (TMM) and tropical interannual (ENSO) mode in the 52-yr (1949-2000) NCEP-NCAR reanalysis are examined for the December-February (DJF) and June-August (JJA) seasons based on seasonal tropical convective rainfall variability and tropical surface (land ocean) temperature variability. These combined modes are shown to capture 70%-80% of the unfiltered variance in seasonal 200-hPa velocity potential anomalies in the analysis region of 30N-30S. The TMM is the dominant mode overall, accounting for 50%-60% of the total unfiltered variance in both seasons, compared to the 22%-24% for ENSO.
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Chelliah et al. (2004) studied this question.
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