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Role of enhanced synoptic activity and its interaction with intra-seasonal oscillations on the lower extended range prediction skill during 2015 monsoon season

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Abstract

Indian summer monsoon of 2015 was deficient with prominence of short-lived (long-lived) active (break) spells. The real-time extended range forecasts disseminated by Indian Institute of Tropical Meteorology using an indigenous ensemble prediction system (EPS) based on National Center for Environmental Predictions’s climate forecast system could broadly predict these intraseasonal fluctuations at shorter time leads (i.e. up to 10 days), but failed to predict at longer leads (15–20 days). Considering the multi-scale nature of Indian Summer Monsoon system, this particular study aims to examine the inability of the EPS in predicting the active/break episodes at longer leads from the perspective of non-linear scale interaction between the synoptic, intraseasonal and seasonal scale. It is found that the 2015 monsoon season was dominated by synoptic scale disturbances that can hinder the prediction on extended range. Further, the interaction between synoptic scale disturbances and low frequency mode was prominent during the season, which might have contributed to the reduced prediction skill at longer leads.

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Acknowledgements

IITM is a research Institution, fully supported by the Ministry of Earth Sciences, Govt. of India, New Delhi. The reanalysis datasets from NCEP and their technical support on CFS model are duly acknowledged. Thanks are also due to IMD for TRMM and Rain gauge merged daily rainfall data.

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Authors and Affiliations

  1. Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pashan, Pune, 411 008, India

    S. Abhilash, R. Mandal, A. Dey, R. Phani, S. Joseph, R. Chattopadhyay, S. De, N. K. Agarwal & A. K. Sahai

  2. India Meteorological Department, Pune, India

    S. Sunitha Devi

  3. Ministry of Earth Sciences (MoES), Government of India, New Delhi, India

    M. Rajeevan

Authors
  1. S. Abhilash
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  2. R. Mandal
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  3. A. Dey
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  4. R. Phani
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  5. S. Joseph
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  6. R. Chattopadhyay
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  7. S. De
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  8. N. K. Agarwal
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  9. A. K. Sahai
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  10. S. Sunitha Devi
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  11. M. Rajeevan
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Corresponding author

Correspondence to A. K. Sahai.

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Abhilash, S., Mandal, R., Dey, A. et al. Role of enhanced synoptic activity and its interaction with intra-seasonal oscillations on the lower extended range prediction skill during 2015 monsoon season. Clim Dyn 51, 3435–3446 (2018). https://doi.org/10.1007/s00382-018-4089-3

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