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Active-Break Transitions of Monsoons Over India as Predicted by Coupled Model Ensembles

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Abstract

The active-break cycle of monsoons is the most important phenomenon of the Indian summer monsoon, and its prediction in real time will help to review the ongoing monsoon conditions for providing outlooks to farmers and disaster managers. The monsoon seasons of 2017 and 2018 during July–August witnessed many active-break-active transitions, with long dry spells. The recently implemented Climate Forecast System version 2 coupled model-based ensemble prediction system at the India Meteorological Department was used to observe the performance of a real-time extended-range forecast (ERF) of active-break-active cycles of the monsoon at different spatial scales during 2017 and 2018. The results indicated that the operational ERF has good fidelity in predicting the active-break-active transitions of the monsoon during 2017 and 2018 based on large-scale indices including the monsoon intraseasonal oscillation and low-level circulation. Quantitatively, the forecast of all India and central India rainfall during the active, break and transition phases of the monsoon are very well captured with a lead time of 2–3 weeks. In particular, the long dry spell during first 3 weeks of August and the active last week of August 2017 associated with very heavy rainfall over western coastal states of India were very well captured, whereas the active phase over the southern peninsula during 10–16 August 2018 was slightly underestimated. At smaller spatial scales, the ERFs for 36 meteorological (met)-subdivisions of India for 2–3 weeks could provide useful guidance to farmers during different monsoon phases. Thus, the skilful real-time ERF of the monsoon is very useful to user communities.

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Acknowledgements

The real-time extended-range forecast capability of IMD is being strengthened through the collaborative efforts of the MoES institutions viz., the IITM, NCMRWF, INCOIS and NCEP. The CFSv2/GFSbc customised at IITM was implemented in IMD for the operational run. The authors are thankful to Dr. M. Rajeevan, Secretary, MoES for making this possible. We also thank Dr. K. J. Ramesh, the previous Director General of Meteorology (DGM) and Dr. M. Mohapatra, the present DGM of IMD for their encouragement and for providing all facilities to carry out this work. Finally, thanks are also due to the anonymous reviewers for valuable comments and suggestions to improve the quality of the paper.

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Pattanaik, D.R., Sahai, A.K., Muralikrishna, R.P. et al. Active-Break Transitions of Monsoons Over India as Predicted by Coupled Model Ensembles. Pure Appl. Geophys. 177, 4391–4422 (2020). https://doi.org/10.1007/s00024-020-02503-2

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