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Zonal circulation indices, 500 hPa April ridge position along 75° E and Indian summer monsoon rainfall: Statistical relationships

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Summary

This paper presents an examination of the statistical relationship between summer monsoon rainfall over all India, and two sub-regions (north west India and peninsular India) and the indices of mid-latitude (35° to 70° N) zonal circulation at 500 hPa level, over different sectors of the hemisphere, based on 19 years (1971–1989) data. The results indicate that summer monsoon rainfall (June–September) over India shows; (i) a significant and direct relationship with the strength of the zonal circulation index during concurrent July over the sector 90° E to 160° E. (ii) a significant inverse relationship with the strength of the zonal index during the previous April over the sector 160° E to 45° W and a similar relationship with the whole northern hemisphere and (iii) a significant and direct relationship with the frequency of the zonal index during the previous January over the sector 45° W to 90° E.

Significant relationships are also observed between the zonal circulation indices of the above mentioned months and sectors with the 500 hPa ridge location in April at 75° E over India.

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  1. Department of Geophysics, Banaras Hindu University, Varanasi, India

    J. Chattopadhyay, R. Bhatla & O. Prakash

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  1. J. Chattopadhyay
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  2. R. Bhatla
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  3. O. Prakash
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Chattopadhyay, J., Bhatla, R. & Prakash, O. Zonal circulation indices, 500 hPa April ridge position along 75° E and Indian summer monsoon rainfall: Statistical relationships. Theor Appl Climatol 50, 35–43 (1994). https://doi.org/10.1007/BF00864901

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  • DOI: https://doi.org/10.1007/BF00864901

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