Phase and amplitude monitor (last 40-day)

Year Month

Fig. MJO phase monitor based on multivariate EOF analysis (Left: OLR+U200+U850, Right: CHI200+U200+U850)
Data period for the normal is from 1981 to 2010. Seasonal, interannual and ENSO variations were subtracted from the tropical variations (Wheeler and Hendon, 2004). JRA-55 is used for the atmospheric data. OLR data are provided by NOAA. NINO.3 index was used for calculating ENSO variation instead of COBE-SST because of the difficulty to extract ENSO variation. Each figures show the last 40 days trajectory from the final day of each month.