Trends and fluctuations of the cyclonic systems over North Indian Ocean

Authors

  • D. V. BHASKAR RAO
  • C. V. NAIDU
  • B. R. SRINIVASA RAO

DOI:

https://doi.org/10.54302/mausam.v52i1.1674

Keywords:

Cyclones, Long-term trends, Periodicities

Abstract

The data of the monthly cyclone frequencies over North Indian Ocean for the period 1877-1998 has been analysed to study the long-term trends and fluctuations. Analysis has been made separately for depressions and cyclones for the pre-monsoon, monsoon and post-monsoon seasons along with the annual frequencies. The data was subjected to 11-year moving averages and the epochs of increasing and decreasing trends have been identified. A consistent decreasing trend after 1950s is a notable feature.

 

The time series of the monthly cyclone frequency were passed through a high-pass filter to eliminate periods greater than 21 years and then subjected to spectrum analysis using Maximum Entropy Method to obtain dominant periodicities. Three significant periodicities at 2.2-2.8; 3.5-6.5 and 10-15 years have been identified which could be attributed to QBO, ENSO and decadal frequencies.

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Published

01-01-2001

How to Cite

[1]
D. V. B. . RAO, C. V. . NAIDU, and B. R. S. . RAO, “Trends and fluctuations of the cyclonic systems over North Indian Ocean”, MAUSAM, vol. 52, no. 1, pp. 37–46, Jan. 2001.

Issue

Vol. 52 No. 1 (2001): MAUSAM

Section

Research Papers

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