International Journal of Climatology · 2007 · 725 citations · 13 references
EngineeringRainfall PatternExtreme WeatherWeather ForecastingEarth SciencePrecipitationPrecipitation ProcessesSpatial DistributionApplied MeteorologyDrought ForecastingMeteorological MeasurementMonthly Rainfall DataHydrometeorologyMeteorologyGeographyHydrologyLinear Trend AnalysisClimate DynamicsClimatologyDroughtSummer Monsoon
The new network averages one rain gauge per 3,402 km². The study performed linear trend analysis to assess long‑term rainfall trends across subdivisions and monsoon month contributions to annual totals. Researchers constructed monthly, seasonal, and annual rainfall series for 36 subdivisions from 1901–2003 using 1,476 stations and applied EOF analysis to map spatial patterns. The series proved temporally and spatially homogeneous, revealing significant decreasing trends in Jharkhand, Chattisgarh, and Kerala, increasing trends in eight other subdivisions, and shifting monsoon month contributions, with June–July–September decreasing and August increasing in some areas. © 2007 Royal Meteorological Society.
Abstract New monthly, seasonal and annual rainfall time series of 36 meteorological subdivisions of India were constructed using the monthly rainfall data for the period 1901–2003 of fixed network of 1476 rain gauge stations. In the new network, on an average, there is one rain gauge station for every 3402 Sq km area. The new rainfall series is temporally as well as spatially homogenous. Linear trend analysis was carried out to examine the long‐term trends in rainfall over different subdivisions and monthly contribution of each of the monsoon months to annual rainfall. During the south‐west monsoon season, three subdivisions viz. Jharkhand, Chattisgarh, Kerala showed significant decreasing trend and eight subdivisions viz. Gangetic WB, West UP, Jammu and Kashmir, Konkan and Goa, Madhya Maharashtra subdivision, Rayalseema, Coastal AP and North Interior Karnataka showed significant increasing trends. It has been found that the contribution of June, July and September rainfall to annual rainfall is decreasing for few subdivisions while contribution of August rainfall is increasing in few other subdivisions. EOF analysis is also done to know the spatial distribution of rainfall. The all India Monthly, seasonal and annual rainfall series constructed based on the 1476 stations are also reported. Copyright © 2007 Royal Meteorological Society
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