The intraseasonal fluctuation of Indian summer monsoon rainfall and its relation with monsoon intraseasonal oscillation (MISO) and Madden Julian oscillation (MJO)

The intraseasonal fluctuations of Indian summer monsoon rainfall (ISMR) are mainly controlled by northward propagating oscillation (MISO) and eastward Madden Julian (MJO). In the current study, we examine relationship between (active break spells) ISMR with phase propagation amplitude MISO MJO. We notice that active spells generally occur during phases 2–5 (MJO 3–6), 6–8 1). association active/break is more prominent than MJO phases. show composite unfiltered regression-based reconstructed for eight phases, which consistent earlier findings. field shows a systematic well-organised compared to field. Phase also indicates lead-lag robust composite. explained percentage variance reference 20–90-day filtered rainfall. It found long (> 7 days) predominantly occurs when either or MJO, both them active, associated signal somewhere in 2 5. A (MISO MJO) at least one (MJO/MISO) feeble, even though signals strong, they primarily located 1, 6, 8.