Author(s): Neethu RS, Dr. Brigit Joseph, Pratheesh P Gopinath, Dr. Ajith K and T Paul Lazarus

Abstract: Climate change nowadays is one of the world’s biggest environmental challenges. Changes in temperature and precipitation will adversely affect the crop productivity and result in long term food starvation. The reduction in agricultural yield and rise in poverty levels created by changing climatic parameters will be major threats in economic development of nations. Analysis of climatic parameters would enable the farmers to adopt agricultural practices that minimize the adverse effect created by the changing climate. But it is a difficult task to analyze the changing pattern of climate as it is happening due to various reasons, some of which are local and some are global factors. Analysis on hydroclimatic variables can provide information on how the climate has evolved over time. Since these events have a correlation with respect to time, it is relevant to apply time series analysis on the time dependent data. In this context a study was made in this paper to analyse climate change overtime occurring from 1991 to 2019 in RARS, Vellayani. The major climatic parameter under the study includes maximum and minimum temperature and rainfall over a period of 29 years. To identify an overall outlook of climatic parameters on a temporal basis various descriptive statistical measures like mean, range, standard deviation and coefficient of variation were used. The average monthly maximum temperature over the years varied from 30.01 to 32.94 and minimum temperature 21.91 to 24.92. Highest amount of rainfall was received during June and lowest in January. Trend analysis based on non-parametric tests Mann-Kandall (MK) and Sen’s slope estimation were performed to assess climate change overtime occurred. No significant trend was noticed in annual and seasonal rainfall while a non significant decline in rainfall was noticed for south west and north east monsoon in Vellayani. At the same time an increasing and significant trend was observed for temperature in all the seasons at Vellayani. The magnitude of the positive slopes of the annual maximum temperature and minimum temperature of RARS, Vellayani was found to be 0.038 0 C/year and 0.039 0 C/year.

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