Trends of rainfall and temperature in Konkan region of Maharashtra

Abstract

Konkan is a coastal strip parallel to Sahyadri hill ranges, which rises from mean sea level to 300 meter height having annual rainfall range from 2300 mm to 4100 mm (Anonymous, 2013).Climate change is acting as a trigger for changing rainfall pattern and temperature which can have significant impacts on hydrological cycle and crop calendar of the region (Abrol et al., 2004). Mono-cropping with rice cultivation during kharif season is generally observed while the horticultural crops like mango, cashew and coconut are major crops of the region. In last few years' production, productivity and quality of mango is adversely affected due to change in different meteorological parameters in the region (Munj et al., 2017). The variability in rainfall and temperature of the Konkan region has been reported by various workers (Dixit et al., 2005;Yadav and Dixit, 2006;Talathi et al., 2008). However no work is reported on trends in the climatic parameters of this region. Hence, the presents study was undertaken to analyse the trends in annual and seasonal rainfall and temperaturein the Konkan region.The daily rainfall, maximum and minimum temperature data of twelve locations (Table 1) was collected from Department of Agronomy, Dr.Balasaheb Sawant Konkan KrishiVidyapeeth, Dapoli and Water Resource Department, Hydrological Project, Government of Maharashtra, Nasik. The daily data were converted in to seasonal (kharif from 23 rd to 41 st SWM, rabi from 42 nd to 8 th SWM and summer from 9 th to 22 nd SWM) and annual.Trend analysis was statistically examined in two phases i.e., initially the presence of a monotonic increasing or decreasing trend was tested using the non-parametric Mann-Kendall test (Mann, 1945;Kendall, 1995). Then the rate of change was estimated with the help of Sen's slope test (Sen, 1968). The slope of the trend line indicates the rate and direction of change. The significance of results were tested at 90, 95 and 99 per cent confidence levels.

Trend Analysis of Annual Rainfall and Rainy Days Over Pune District of Maharashtra

“…Various studies were carried out to determine the trend of rainfall and rainy days (Atre and Deore 2013;Murumkar and Arya 2014;Chinchorkar et al 2015;Deulkar et al 2015;Jagadeesh et al 2015;Mandal et al 2015;Pandit 2016;Upadhye et al 2016;Zende et al 2017;Jedhe et al 2018;Kalunge 2018and Wale et al 2020. Mann Kendall test (Mann, 1945and Kendall, 1975 is one of the commonly used non-parametric test for determining a trend in hydrologic time series.…”