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Dynamics of intensification of the boreal summer monsoon flow during IOD events

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Abstract

The present study focuses on understanding the dynamics of intensification of the boreal summer monsoon cross-equatorial flow generally observed during positive-Indian Ocean Dipole (IOD) events, by taking 1994 as a case study. In particular, the influence of the anomalous divergent motions during 1994 (i.e., east–west circulation over equatorial Indian Ocean and the monsoon Hadley-type circulation) on the intensification of summer monsoon cross-equatorial flow is investigated. This problem is examined using diagnostic analyses and simulation experiments from a multi-level global atmospheric model forced with observed diabatic heating. The results suggest that the transfer of kinetic energy (KE) from the divergent motions to the rotational flows can be very effective during IOD periods like 1994; and provides a plausible explanation for the increase of KE of the monsoon cross-equatorial flow over Bay-of-Bengal and adjoining areas. The study also investigates the enhanced activity of westward propagating disturbances observed during 1994 over the monsoon region.

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Acknowledgments

We are grateful to Prof. B.N. Goswami, Director, IITM, for providing all the support and facilities. We thank the anonymous reviewers and Editor Dr. John Fasullo for the helpful and constructive comments. This research was partially funded by INCOIS project, Government of India.

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  1. Climate and Global Modelling Division, Indian Institute of Tropical Meteorology, Pashan, Pune, 411008, India

    Suchithra Sundaram, R. Krishnan, Ayantika Dey & P. Swapna

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  1. Suchithra Sundaram
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  2. R. Krishnan
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  3. Ayantika Dey
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  4. P. Swapna
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Correspondence to Suchithra Sundaram.

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Sundaram, S., Krishnan, R., Dey, A. et al. Dynamics of intensification of the boreal summer monsoon flow during IOD events. Meteorol Atmos Phys 107, 17–31 (2010). https://doi.org/10.1007/s00703-010-0066-z

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  • DOI: https://doi.org/10.1007/s00703-010-0066-z

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