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On the northward advance of the Itcz and the onset of the southwest monsoon rains over the southeast Bay of Bengal

✍ Scribed by Ananthakrishnan, R. ;Pathan, J. M. ;Aralikatti, S. S.

Publisher
Wiley (John Wiley & Sons)
Year
1981
Weight
708 KB
Volume
1
Category
Article
ISSN
2314-6214

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✦ Synopsis

Abstract

The pentad rainfall data of six stations in the Andaman‐Nicobar group of islands for the period 1953‐1978 have been analysed to study the northward advance of the ITCZ and the onset of the summer monsoon rainfall over the southeast Bay of Bengal. It is found that at the island stations south of 10Β°N the summer monsoon rains set in on the average towards the end of April which is a month in advance of the onset of the monsoon over the south Kerala coast of peninsular India. At the island stations to the north of 10Β°N the onset occurs about the first week of May. These dates are ahead of those shown in the existing diagrams giving the average onset dates of the summer monsoon over the southeast Bay of Bengal. Examination of the frequency and latitude of formation of cyclonic disturbances in the Bay of Bengal and the progressive seasonal variations of the tropospheric winds over the aerological station of Port Blair during April‐May lend support to the earlier onset dates.

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