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Optimizing a network of raingauges over India to monitor summer monsoon rainfall variations

Singh, N (1994) Optimizing a network of raingauges over India to monitor summer monsoon rainfall variations. International Journal of Climatology, 14. pp. 61-70.

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A network of rain-gauges has been optimized to reconstruct the spatially representative summer monsoon rainfall series (1871–1984) of India prepared by averaging the normalized rainfall (actual divided by mean) of 306 rain-gauges. Three approaches have been attempted: (i) random selection, (ii) fitting a multiple linear regression and (iii) selecting objectively a subset of a few gauges, the mean of which shows the highest correlation coefficient (CC) with the all-India series. By averaging a randomly selected 45 rain-gauges, an average CC with the all-India rainfall series of ca. 0.94 was achieved, and by averaging 100 gauges the average CC was ca. 0.97. By fitting a multiple linear regression between the all-India series and the normalized rainfall series of 306 gauges, a maximum of 34 independent gauges (parameters) were identified and the estimated rainfall series showed a highest CC of 0.9969 with the full series. In the third approach, a subset of 34 rain-gauges was identified following an objective criterion; the mean rainfall of this subset showed a CC of 0.9931 with the all-India series. For routine updating of the all-India summer monsoon rainfall series, however, 35 rain-gauges were selected by applying the third approach to 64 randomly chosen India Meteorological Department (IMD) rain-gauges better known for their timely availability of data. The reconstructed (CC = 0.9866) all-India summer monsoon rainfall series for the period 1871–1992 is presented.

Item Type: Article
Additional Information: Copyright of this article belongs to Royal Meteorological Society
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 14 May 2016 05:09
Last Modified: 14 May 2016 05:09

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