Character! ...tic feature.. .of SO.ul~WC"i1 monsoo n (June to September! rainfall of NewDelh i with its di urnal . cumulative a nd r.angl:\\tlsC' vanallon have bee n studied by constructi ng hourly and ra nge[ntcrval vcries fr om hycto grams ofS~lfdaoung for uic ten years' period. 19?6-1?8~. Stat ion exhibits ligh t to moderaterainfall "altern witha fcw events til rather hea vy rai nfall. The pancm of vanau on of average seasona l and ho urlyrain fall intensity. rainfall per ch ronological hou r. l1,lcan pruba hility of occurrence and its average rai n-dura tionhave been discussed . Cumulative curves between ram amou nt, rain duration and rainfall of increasing amountshave been hrought out . Fo r he...rvy ra infall even ts. the highest probable intensity and its dural ion ha ve been \wrkl't!l )UI.
ABSTRACT. Statistical analysis of 82-years (1901-1982) record of precipitation from 27 rain-recording stations in Punjab state of lndia has been carried out to assess the climate shift if any in the state. The central part of the study is the trend and spectrum analysis of annual. monsoon and winter rainfall of different stations in the region. It is seen that frequency distribution of 19 rainfall series out of 81 series is normally distributed. Maikov linear type of persistence is observed in some of the rainfall series. Marin-Kendall test indicates the decreasing trend in winter rainfall of all the stations and is found to be significant in case of Amritsar, Taran Taran, Tanda, Ludhiana and Ranike. Low-pass filter reveals that trend is not linear but oscillatory consisting of periods of 10 years or more. It is seen that winter rainfall of most of the stations exhibits the decreasing trend from 1935-40 to 1965-70. It is also revealed by the low-pass filter curves that winter rainfall of all t1le sla1ions remained below average from 1960 till the end of the study period.
The spectral analysis indicates a significant cycle of 4.1 to 27 years in some of the stations and Quasi-Biennial Oscillations (QBO) over many stations.
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