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      Changing rainfall in the Palakkad plains of South India

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          Abstract

          Analysis of the general rainfall trend is vital in understanding the underlying features, for the purpose of forecasting and in identifying the changes and impacts that are very crucial for an agro-based economy like the one of India. Situated on the western side of the Palakkad Gap, the Palakkad plains connect the state of Kerala in India to the plains of Tamil Nadu and Deccan. The geographical location results in an environmental realm in the Palakkad plains that is different from the rest of Kerala. The present study examines the general trend of rainfall in the Palakkad plains using monthly rainfall data, almost spanning a century, collected from four rain gauge stations available in the area. The annual rainfall pattern of all the stations showed a trend of significant decline, as the years proceed. Changes in the rainfall may have implications on local ecology as well as in agricultural productivity. The decrement in rainfall may reflect the actual regional level climate changes compounded by various anthropogenic factors.

          Translated abstract

          El análisis de las tendencias generales de la precipitación es vital para entender sus características subyacentes con el propósito de pronosticar e identificar los cambios e impactos que son cruciales para una economía basada en la agricultura como la de la India. Las planicies de Palakkad, situadas al lado oeste de la brecha de Palakkad, comunican al estado de Kerala, en la India, con las planicies de Tamil Nadu y Deccan. Su ubicación geográfica resulta en un ambiente diferente del resto de Kerala. La investigación presente analiza la tendencia general de la precipitación en las planicies de Palakkad utilizando datos mensuales de precipitación, correspondientes a casi un siglo, tomados de la red de estaciones disponibles en el área. El patrón anual de precipitación en todas las estaciones muestra una tendencia significativa de declinación con el paso de los años. Los cambios en la precipitación pueden tener implicaciones en la ecología local así como en la productividad agrícola. El decremento de la precipitación podría ser reflejo de los cambios climáticos a nivel local ocasionados por varios factores antrópicos.

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          Most cited references41

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          Increasing trend of extreme rain events over India in a warming environment.

          Against a backdrop of rising global surface temperature, the stability of the Indian monsoon rainfall over the past century has been a puzzle. By using a daily rainfall data set, we show (i) significant rising trends in the frequency and the magnitude of extreme rain events and (ii) a significant decreasing trend in the frequency of moderate events over central India during the monsoon seasons from 1951 to 2000. The seasonal mean rainfall does not show a significant trend, because the contribution from increasing heavy events is offset by decreasing moderate events. A substantial increase in hazards related to heavy rain is expected over central India in the future.
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            A Hydrological Definition of Indian Monsoon Onset and Withdrawal

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              Some evidence of climate change in twentieth-century India

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                Author and article information

                Journal
                atm
                Atmósfera
                Atmósfera
                Universidad Nacional Autónoma de México, Centro de Ciencias de la Atmósfera (Ciudad de México, Ciudad de México, Mexico )
                0187-6236
                January 2010
                : 23
                : 1
                : 75-82
                Affiliations
                [01] orgnameSálim Ali Centre for Ornithology and Natural History (SACON) orgdiv1Environmental Impact Assessment Division India ppnraj@ 123456gmail.com
                Article
                S0187-62362010000100005 S0187-6236(10)02300100005
                098741ac-236d-4584-af2a-2d7dee16e8f0

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 40, Pages: 8
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                SciELO Mexico


                Indian monsoon,Trend analysis,rainfall patterns,Kerala
                Indian monsoon, Trend analysis, rainfall patterns, Kerala

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