Influence of climatic variability on reference evapotranspiration for beed station of marathwada region
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Date
2019-08-13
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Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
The present investigation entitled “Influence of Climatic Variability on Reference Evapotranspiration for Beed station of Marathwada Region” was undertaken to perform the trend analysis of climatic parameters and derived parameter such as reference evapotranspiration. The Climatic data of 31 years (1983-2013) for three stations of Beed (Maharashtra) was collected and trend analysis was performed by using Mann Kendall test which is non parametric test. The daily meteorological data of temperature, relative humidity, wind speed and evapotranspiration was divided into three decades. Total three decades such as D1 decade for 1983-1992 period, D2 for 1993-2002 and D3 for the period of 2003-2012 were formed and the data for the year 2013 was used for comparison.
Temporal change and their trend for each decade was investigate by annual, seasonal and monthly scale. Reference evapotranspiration was estimated by Penman Monteith 56 method. To investigate the trend Mann Kendall Test Software is used at 95% probability level. The temporal changes in each climatic parameter were calculated by statistical measures as percent deviation, Mean, Standard Deviation and Coefficient of Variation.
The results obtained for maximum temperature indicated the average maximum temperature was increased by 0.51, 1.18 and 1.53% in the decade D1, D2 and D3 respectively and decreased by 3.26% in the year 2013. The MK trend test showed increase in trend in the month of July, September, October, November and December of decade D2, whereas the no trend showed in decade D1 and decade D3. It also showed increasing trend in winter season of decade D2 for station 1. The annual average maximum temperature for station 2 and 3 were 31.63 and 32.10oC. . The MK trend test showed more or less similar pattern of trends for station 2 and 3 as showed by station 1. The annual average minimum temperature for station 1 was 19.64oC. During the study period the average minimum temperature was increased by 0.81 and 1.37% in the decade D2 and D3 respectively and decreased by 0.41 and 1.73% in the decade D1 and 2013 respectively. The MK trend test showed increase in trend in the month of November of decade D1, whereas the no trend showed in decade D2 and decade D3. It showed no trend in all season of decade D1, D2 and D3 for station 1. The MK trend test showed approximately similar trends for station 2 and 3 as showed by station 1 for minimum temperature. The annual average relative humidity for station 1 was 50.85%. During the study period the average relative humidity was increased by 10.29 % in the year 2013 and decreased by 5.03, 2.73 and 2.52 % in the decade D1, D2 and D3 respectively for station 1. The MK trend test showed decrease in trend in the month of July, October and December of decade D2. It also showed decreasing trend in winter season of decade D2 for station 1. The MK trend test showed nearly similar trends for station 2 and 3 as showed by station 1. The annual average wind speed for station 1 was 2.92 m/s. During the study period the average wind speed for station 1 was increased by 2.74 and 2.40 % in the decade D1 and D2 and decreased by 0.68 and 4.11 % in the decade D3 and year 2013 respectively. Annual average wind speed for station 2 and 3 were 2.97 and 2.98 m/s. The annual reference evapotranspiration for station 1 was ranged from 1798.34 mm to 2235.21 mm with mean value of 2063.69 mm. There was increasing trend of ETo during March month in decade D1 and July, September, October months in decade D2 and there was decreasing trend in October, November, December months in decade D3. It also showed increasing trend in winter season of decade D2 and decreasing trend in winter season of decade D3 for station 1.the annual reference evapotranspiration for station 2 and 3 had almost similar values. The MK trend test showed approximately similar trends for station 2 and 3 as showed by station 1. The annual trend analysis results shows that there was no trend found for maximum temperature, minimum temperature, average relative humidity and reference evapotranspiration and there was decreasing trend found for wind speed for station 1, 2 and 3. The most influencing climatic parameter on reference evapotranspiration is average relative humidity followed by maximum temperature for Beed station.
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