Optimization of the raingauges for a representative all-India and subdivisional rainfall series
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An objective approach similar to the forward selection of independent variables in the multiple linear regression has been attempted to optimize the network of raingauges for the summer monsoon rainfall (June–September total) series (1871–1984) of India as well as its 29 selected meteorological subdivisions prepared involving the data of 306 raingauges. For the all-India monsoon rainfall series twenty seven gauges entered the selection whose mean showed the correlation coefficient (CC) of 0.9869. Keeping in view the difficulties of getting data from all the 306 gauges, 35 India Meteorological Department (IMD) gauges with mean showing CC of 0.9898 have been identified for updating this series. The constructed all-India monsoon rainfall series for the period 1871–1992 using 35 selected observations is presented. It was interesting to note that the set of 35 gauges selected for the monsoon total has shown equally promising results for the all-India monsoon monthly (June–September) as well as the annual rainfall series.
For the 29 subdivisional monsoon rainfall series, however, in total 188 IMD-gauges (62% of the total of 306 gauges) entered the selection. For 17 subdivisions the CC exceeded 0.98, for 3 subdivisions it varied between 0.97 and 0.98, for 5 subdivisions between 0.96 and 0.97 and for the remaining 4 subdivisions between 0.90 and 0.94. They showed equally encouraging results for the monsoon monthly and annual rainfall series for the different subdivisions.
Limitations and implications of the optimization technique are also briefly discussed.
KeywordsClimate Change Waste Water Water Pollution Multiple Linear Regression Promising Result
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- Blanford, H. F., 1886: The rainfall of India.Indian Met. Mem.,3, 658 pp.Google Scholar
- Eliot, Sir John, 1906: Climatological atlas of India, Issued by the Indian Meteorological Department, Messrs. John Bartholomew & Co. The Geographical Institute, Edinburgh, Plates 5 & 6.Google Scholar
- Flohn, H., 1976: Time variations of climatic variability. International Symposium on Recent Climatic Change and Food Production held during Oct. 4–8, 1976, Tsukuba and Tokyo, Edited by K. Takahashi and M. M. Yoshino, University of Tokyo Press, 311–318.Google Scholar
- India Meteorological Department, 1972: Weekly Weather Report, Office of the Deputy Director General of Observatories (forecasting), India Meteorological Department, Pune.Google Scholar
- Kripalani, R. H., Kulkarni, A., Panchawagh, N., Singh, S. V., 1992: Spatial patterns of Indian monsoon rainfall for the period 1871–1990. Res. Rep. No. RR-051, Indian Institute of Tropical Meteorology, Pune, 34 pp.Google Scholar
- Mooley, D. A., Pant, G. B., 1981: Droughts in India over the last 200 years, their socio-economic impact and remedial measures for them. In: Wigley, T. M. L., et al. (eds.)Climate and History, 465–478.2Google Scholar
- Mooley, D. A., Parthasarathy, B., 1984: Fluctuations in all-India summer monsoon rainfall during 1871–1978.Climatic Change 6, 287–301.Google Scholar
- Mooley, D. A., Parthasarathy, B., Sontakke, N. A., Munot, A. A., 1981. Annual rainwater over India, its variability and impact on the economy.J. Climatol. 1, 167–186.Google Scholar
- Mooley, D. A., Parthasarathy, B., Sontakke, N. A., 1982: An index of summer monsoon rainfall excess over India and its variability 1871–1978.Arch. Met. Geoph. Biokl. B31, 301–311.Google Scholar
- Parthasarathy, B., Dhar, O. N., 1975: Trend analysis of annual Indian rainfall.Hydrol. Sci. Bull. 20, 257–260.Google Scholar
- Parthasarathy, B., Dhar, O. N., 1976: A study of trends and periodicities in the seasonal and annual rainfall of India.Ind. J. Met. Hydrol. Geophys. 27, 23–28.Google Scholar
- Parthasarathy, B., Mooley, D. A., 1978: Some features of a long homogeneous series of Indian summer monsoon rainfall.Mon. Wea. Rev. 106, 771–781.Google Scholar
- Parthasarathy, B., 1984: Some aspects of large scale fluctuations in the summer monsoon rainfall over India during 1871–1978. Ph. D. Thesis. University of Poona, Pune (India) 370 pp.Google Scholar
- Parthasarathy, B., Sontakke, N. A., Munot, A. A., Kothawale, D. R., 1987: Droughts/floods in the summer monsoon season, over different meteorological sub-divisions of India for the period 1871–1984.J. Climatol. 7, 57–70.Google Scholar
- Pramanik, S. K., Jagannathan, P., 1953: Climatic changes in India: Rainfall.Indian J. Met. Geophys. 4, 291–309.Google Scholar
- Rao, K. N., Jagannathan, P., 1963: Climatic changes in India. Proc. Symp. on changes in climate, Rome, UNESCO and WMO, 49–66.Google Scholar
- Walker, G. T., 1910: On the meteorological evidences for supposed changes of climate in India.Indian Meteorol. Memo. 21 (Part I), 1–21.Google Scholar
- Wigley, T. M. L., Briffa, K. R., Jones, P. D., 1984: On the average value of correlated time series, with application in dendroclimatology and hydrometeorology.J. Climate Appl. Meteor. 23, 201–213.Google Scholar