Onset, withdrawal and intra-seasonal variation of northeast monsoon over coastal Tamil Nadu, 1901-2000

Authors

  • Y. E. A. RAJ

DOI:

https://doi.org/10.54302/mausam.v54i3.1551

Keywords:

Northeast monsoon, Coastal Tamil Nadu, Onset, Withdrawal, Duration, 40-day periodicity, Cross lag correlation, Spectral analysis

Abstract

The onset and withdrawal dates of northeast monsoon over coastal Tamil Nadu have been objectively determined for the ten year period 1991-2000.  The statistics of onset and withdrawal dates for the 100 year 20th century period 1901-2000 have been presented and discussed. It has been shown by employing techniques such as harmonic/spectral analysis and cross lag correlation over  100 year rainfall data, that the daily rainfall of coastal Tamil Nadu during September-February  displays a prominent 40-days periodicity and that rainfall anomalies move from south to north taking nearly 2 days to traverse between Pamban and Chennai separated latitudinally by nearly 400 km.  In 70% of the years the onset and withdrawal process of northeast monsoon gets excited by the 40-day periodicity.

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Published

01-07-2003

How to Cite

[1]
Y. E. A. RAJ, “Onset, withdrawal and intra-seasonal variation of northeast monsoon over coastal Tamil Nadu, 1901-2000”, MAUSAM, vol. 54, no. 3, pp. 605–614, Jul. 2003.

Issue

Section

Research Papers

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