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Monitoring large-scale rainfall variations across India

Singh, HN and Singh, N and Sontakke, NA (2009) Monitoring large-scale rainfall variations across India. In: Symposium JS.4 at the Joint Convention of the International Association of Hydrological Sciences, IAHS and the International Association of Hydrogeologists, IAH, 6-12 September 2009, Hyderabad, India.

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Abstract

To understand spatial variability of rainfall fields over India, sequential thematic maps have been prepared in a GIS environment (GeoMedia Professional 5.1) using data from 316 raingauge stations for the period 1871-2006. The thematic maps show interannual expansion/contraction of moisture regions (arid, semi-arid, dry subhumid, moist subhumid, humid and perhumid), and very dry, dry, wet and very wet zones of the four seasons and the twelve calendar months. The annual moisture regions and seasonal as well as monthly wet and dry zones exhibit large interannual variation but in an organized manner. The arid area shows a dry period during 1999-2004, semi-arid during 1964-2004, moist subhumid during 1999-2004, humid during 1998-2004 and perhumid 1995-2006, while the dry subhumid shows a wet period during 1984-2006. Overall during recent years (1995-2006) the climate of the country has been drier. To describe spatio-temporal features of the seasonal and monthly rainfall an integrated Rainfall Spatial Distribution Index (RSDI) has been developed by lumping the areas under very dry, dry, wet and very wet conditions. In winter rainfall, a dry period is seen during 1987-2006 and in the summer monsoon rainfall during 1972-2006, while a wet penod is seen in summer rainfall during 1977-2006 and in post monsoon rainfall during 1994-1999. In recent years, declining trends are seen in eight months (January, February, March, July, August, September, November and December) and increasing trends in the other four months.

Item Type: Conference or Workshop Item (Other)
Additional Information: Copyright of this article IAHS.
Uncontrolled Keywords: Arid area; Dry/wet zones; Interannual; Interannual variation; Post-monsoon; Rain gauges; Rainfall fields; Rainfall monitoring; Rainfall variation; Semi arid; Spatial distribution; Spatial variability; Spatio-temporal; Sub-humid; Summer monsoon rainfall; Summer rainfall; Thematic maps; Wet and dry; Wet conditions; Wet period; Wet zones; Winter rainfall, Arid regions; Atmospheric thermodynamics; Curing; Drought; Groundwater; Hydrogeology; Maps; Moisture; Water resources, Rain, environmental monitoring; GIS; humid environment; index method; integrated approach; moisture; precipitation assessment; rainfall; raingauge; semiarid region; spatial variation; spatiotemporal analysis; temporal variation; thematic mapping, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 Feb 2015 06:20
Last Modified: 22 Feb 2015 06:20
URI: http://moeseprints.incois.gov.in/id/eprint/1731

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