Figure 1
From: Exploring the long-term changes in the Madden Julian Oscillation using machine learning
(a) Lead-lag correlation between RMM1 and RMM2 for CNN-1D (blue), OT12 (orange), WH04 (black), MLR (red), SVR (green) and JRA55 (cyan) index. For MLR, SVR, and OT12 index, maximum correlation is observed at a lag of 7–8 days. For CNN-1D, JRA55, and WH04 maximum correlation is observed at a lag of 9 days. (b) Running 11-year mean MJO amplitude for CNN-1D, OT12, WH04, MLR, SVR, JRA55 MJO index (blue, orange, black, red, green and cyan respectively). Long-term trend values according to the different MJO indices range between 0.23 and 0.27 per century, based on 1905–2015 data. The trend indicates a 22–27% increase of MJO amplitude per century.
