DISCLAIMER: Please note these pages present experimental analyses developed by researchers at CICS-NC and/or of interest to the CICS-NC community and their collaborators. These analyses are subject to change as our understanding of the Earth's climate system improves and/or our interests change. There is no guarantee on their future availability.
Wheeler and Hendon (2004) constructed the RMM index for monitoring the MJO. This index consists of the first two principal components (PCs) of OLR, 850-hPa zonal wind, and 200-hPa zonal wind averaged 15S-15N.
This page takes that simple index and breaks it down into its components, either by variable or by latitude. For latitudes, the data from each latitude band are simply projected onto the original RMM empirical orthogonal functions (EOFs), which were calculated using the full band 15S-15N. For the variables, the data are similarly projected on the original EOFs. In this case, the resulting PCs are re-standardized based on their 1980-2010 time series. This step is necessary for comparison because the OLR PCs have significantly lower amplitudes.
| Total RMM | 40 days | 90 days |
|---|---|---|
| RMM by variable | 40 days | 90 days |
| RMM by latitude | 40 days | 90 days |
