Abstract
The intraseasonal fluctuation of Indian summer monsoon rainfall and its relation with monsoon intraseasonal oscillation (MISO) and Madden Julian oscillation (MJO)
Highlights
In recent years much attention is being paid towards intraseasonal prediction as it fills the gap between synoptic weather scale and seasonal scale
The active days mainly occur during Monsoon Intra-seasonal Oscillation (MISO) phase [2,3,4,5] (6–8) whereas the frequency of active days is high during Madden Julian Oscillation (MJO) phases [3,4,5,6] (6–8 and 1)
The MISO phase composite structure for unfiltered rainfall during the phase [2,3,4,5] shows systematic northward propagation and resembles the canonical structure of active monsoon condition, and phase [6,7,8] resembles with break monsoon condition (Fig. 4a), consistent with Fig. 2
Summary
In recent years much attention is being paid towards intraseasonal prediction as it fills the gap between synoptic weather scale and seasonal scale. Many researchers (Goswami, 2005; Lawrence and Webster, 2002; Sikka and Gadgil, 1980; Yasunari, 1979) have reported that low frequency intraseasonal fluctuations over the Indian monsoon region are largely controlled by two dominant modes of variability: (a) the convectively coupled, planetary scale, eastward propagating MJO (Hendon and Salby, 1994; Madden and Julian, 1994, 1972; Salby and Hendon, 1994) and (b) the northward propagating MISO (Lau and Chan, 1986; Sikka and Gadgil, 1980; Wang et al, 2005). These two are the most dominating modes of intraseasonal oscillation. For monitoring northward propagating MISO, we have utilised the PCs based on Suhas et al (2013)
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