ORIGINAL RESEARCH
Spatiotemporal Variability of Temperature and
Its Extremes Over an Agro-Ecological Region
of Tamil Nadu, India
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Department of Civil Engineering, PSNA College of Engineering and Technology, Dindigul, Tamil Nadu, India
Submission date: 2019-11-07
Final revision date: 2019-12-09
Acceptance date: 2019-12-10
Online publication date: 2020-04-07
Publication date: 2020-06-08
Corresponding author
B. Ganeshkumar
Civil Engineering, PSNA College of Engineering and Technology, India
Pol. J. Environ. Stud. 2020;29(5):3561-3568
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ABSTRACT
Temperature data from 14 stations were used to explore the spatiotemporal variability of temperature
and its extremes for the period 1960-2018 in the Cauvery River Delta (CRD) area, an agro-ecological
region of Tamil Nadu State, India. This investigation was carried out by using spline interpolation
method, linear regression and Mann-Kendall test with a Sen’s slope estimator. Results indicated that
the spatial patterns and temporal trends of annual and seasonal temperature showed an upward trend in
most parts of the CRD region. The spatial changes of mean temperature at annual and seasonal scale
were similar and showed an upward trend. Extreme temperature indices showed an increasing trend
throughout the area. This investigation was carried out for a period of six decades from the year 1960.
The CRD region exhibited a warming trend after the 1980s. Temperature variability over this region
was witnessed by the global and regional level climate warming. These variability conditions would
influence the growth and life cycle of agricultural crops. The results of this investigation could support
decision makers and authorities to activate adequate irrigation and crop-changing strategies in order to
protect vulnerable ecosystems and environmental conditions of the CRD region.