Open AccessTRENDS AND PERIODICITIES OF SURFACE AIR TEMPERATURE OF DELHI
Author(s) -
B. Lal
Publication year - 1993
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v44i1.3771
Subject(s) - climatology , monsoon , environmental science , surface air temperature , trend analysis , atmospheric sciences , period (music) , geography , meteorology , mathematics , precipitation , geology , statistics , physics , acoustics
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.