Figure 4
From: Exploring the long-term changes in the Madden Julian Oscillation using machine learning
Running 11-year mean number of MJO events in (a) annual (upper panel) and (b) boreal winter (lower panel). Trend values are 2.32 (annual) and 1.26 (boreal winter) events per century, respectively. Average power spectrum of (c) RMM1 and (d) RMM2 during 1924–1944 (+ ve PDO), 1945–1977 (-ve PDO), 1977–2005 (+ ve PDO) and 2006–2012 (-ve PDO) boreal winter. A multi-decadal shift of the maximum power is observed between 45 and 60 days periodicity.
