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Variations of surface pressure over India during the southwest monsoon

Nagar, SG and Singh, SV (1991) Variations of surface pressure over India during the southwest monsoon. Theoretical and Applied Climatology, 44 (2). pp. 95-112.

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Intraseasonal and interannual variations of surface pressure and surface pressure anomalies are studied using 19 years of daily surface pressure data at 60 stations in India during the south-west monsoon season. The interannual variability of surface pressure is highest over northwest India and a ridge runs eastward near 23 °N. The spatial pattern of total daily intra-seasonal variations is similar to that of interannual variability. The seasonal cycle accounts for about 50 of the intraseasonal variance over northwest India. When the seasonal cycle is removed the high standard deviations are observed over the area adjoining the head of the Bay of Bengal where the frequency of occurrence of the intense cyclonic disturbances is highest. The area of maximum intraseasonal variability keeps shifting westward as one goes from June through to September. A harmonic analysis is performed to study the contribution to the variances by the 30-60 days and 10-20 days period ranges during excess and deficient monsoon years. EOF analysis of the 5-day mean pressure anomaly fields is conducted to study the most dominant modes of variation.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer-Verlag
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 02 May 2015 04:39
Last Modified: 02 May 2015 04:39

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