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Characteristics of Arabian Sea mini warm pool and Indian summer monsoon

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Abstract

Arabian Sea Mini Warm Pool (ASMWP) is a part of the Indian Ocean Warm Pool and formed in the eastern Arabian Sea prior to the onset of the summer monsoon season. This warm pool attained its maximum intensity during the pre-monsoon season and dissipated with the commencement of summer monsoon. The main focus of the present work was on the triggering of the dissipation of this warm pool and its relation to the onset of summer monsoon over Kerala. This phenomenon was studied utilizing NCEP/NCAR (National Center for Environmental Prediction/National Center for Atmospheric and Research) re-analysis data, TRMM Micro wave Imager (TMI) and observational data. To define the ASMWP, sea surface temperature exceeding 30.25°C was taken as the criteria. The warm pool attained its maximum dimension and intensity nearly 2 weeks prior to the onset of summer monsoon over Kerala. Interestingly, the warm pool started its dissipation immediately after attaining its maximum core temperature. This information can be included in the present numerical models to enhance the prediction capability. It was also found that the extent and intensity of the ASMWP varied depending on the type of monsoon i.e., excess, normal, and deficient monsoon. Maximum core temperature and wide coverage of the warm pool observed during the excess monsoon years compared to normal and deficient monsoon years. The study also revealed a strong relationship between the salinity in the eastern Arabian Sea and the nature of the monsoon.

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Acknowledgments

This study was carried as a part of CP Neema’s Ph. D work in the Department of Atmospheric Sciences, Cochin University of Science and Technology. CP Neema thanks Prof. PN Vinayachandran for allowing to utilize the facilities at Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science to carry out the work.

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Authors and Affiliations

  1. Indian Institute of Science, Bangalore, India

    C. P. Neema

  2. Naval Physical and Oceanographic Laboratory, Kochi, Kerala, India

    P. V. Hareeshkumar

  3. School of Marine Science, CUSAT, Kochi, India

    C. A. Babu

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  1. C. P. Neema
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  2. P. V. Hareeshkumar
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  3. C. A. Babu
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Correspondence to C. P. Neema.

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Neema, C.P., Hareeshkumar, P.V. & Babu, C.A. Characteristics of Arabian Sea mini warm pool and Indian summer monsoon. Clim Dyn 38, 2073–2087 (2012). https://doi.org/10.1007/s00382-011-1166-2

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