Evaluation of four aspects and regional significance of trends for gridded maximum and minimum temperature data over the Cauvery River Basin, India

Author : Malluraj C. Hitni and Ganesh D. Kale

*Research Scholar, Department of Civil Engineering, Sardar Vallabhbhai National Institute of Technology Surat-395007, Gujrat, India

**Associate Professor, Department of Civil Engineering, Sardar Vallabhbhai National Institute of Technology Surat-395007, Gujrat, India

Abstract

In the present study, trend analysis (TA) of maximum temperature (Tmax) and minimum temperature (Tmin) data is performed for various temporal scales viz., monthly, seasonal and annual for the period of 1970-2022 over the Cauvery River Basin (CRB). TA is performed for assessing four aspects of the trend viz., magnitude, statistical significance (STS), nature, commencement and end of the trend by using Sen's slope (SS) test, Mann-Kendall (MK) test or MK test with Block Boot Strapping, innovative trend analysis (ITA) plot and Sequential MK (SQMK) test, respectively along with assessment of regional significance of trends by using FDR test which is not performed by any reviewed study. The results showed increasing trends in both Tmax and Tmin data for all temporal scales with positive SS values. At greater number of grids significant increasing trends are observed in Tmax as compared to Tmin. It is observed that, at most of the grids, trends are started in 1970s. Regionally significant trends are detected in Tmax during monsoon and post-monsoon seasons and in Tmin during pre-monsoon and monsoon seasons.

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