TRENDS AND PERIODICITIES OF SURFACE AIR TEMPERATURE OF DELHI

Authors

  • BHUKAN LAL

DOI:

https://doi.org/10.54302/mausam.v44i1.3771

Keywords:

Trend, Periodicity, Persistence, Power spectrum, Auto-correlation coefficient, Null hypothesis

Abstract

Seasonal and annual surface air temperature of Delhi has been analysed for 90-year period (1901-1990) for finding trends and periodicities. The analysis revealed that frequency distribution of all the four seasons as well as of annual time series is normal. Markov linear-type of persistence is observed in pre and post-monsoon seasons. Recent period {1961-1990) averages of temperature are significantly lower than the long period means in respect of annual, monsoon and pre-monsoon seasons. Decreasing trend is noticed in monsoon and annual temperature time series. Low-pass filter analysis suggests that the trend is not linear but oscillatory consisting periods of 10 years or more.

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Published

01-01-1993

How to Cite

[1]
B. . LAL, “TRENDS AND PERIODICITIES OF SURFACE AIR TEMPERATURE OF DELHI”, MAUSAM, vol. 44, no. 1, pp. 35–38, Jan. 1993.

Issue

Vol. 44 No. 1 (1993): Mausam

Section

Shorter Contribution

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