Abstract
Spatial and temporal precipitation changeability in Tamil Nadu State in India was analyzed by utilizing month to month precipitation information for a long time (1901-2002) from 29 stations. Tamil Nadu is one of the southern states of India which has a farming-based economy. Sen’s slope method has been used to estimate the magnitude of trend, whose statistical significance was assessed by the Mann-Kendall test, the highest decreases were observed in a summer precipitation and annual precipitation decreasing trends were detected at many stations in January, February and June. The coefficient of variation (CV) was used to analyze precipitation variability. The Slope test depicts a decreasing trend at all Stations over the past 102 years, from the results obtained by both Parametric and Non-parametric tests for annual and monsoon precipitation at 5% level of significance. The Weakening precipitation of the monsoon circulation parameters caused by global warming appears to be the main causes of recent changes. The most elevated inconstancy was seen in the monsoon precipitation and least fluctuation was seen in the late summer over the 102 years (1901-2002). The weakening precipitation of the monsoon circulation parameters caused by gradual increase in the overall temperature of the earth is the major cause of recent changes.
Highlights
The Tamil Nadu state regions have experienced a significant climatic change in the last five decades
In Indian cardamom hills shows increases in temperature coupled with change in rainfall pattern in this tropical high-altitude forest ecosystem (Muthusamy Murugan et al 2011), Change in precipitation and its effect on water accessibility is critical for water managers
Some past investigations identifying with changes in precipitation over India have reasoned that there is no unmistakable pattern of increment or reduction in normal yearly precipitation over the nation (Mooley & Parthasarathy, 1984; Sarker & Thapliyal, 1988; Thapliyal & Kulshrestha, 1991; Lal, 2001)
Summary
The Tamil Nadu state regions have experienced a significant climatic change in the last five decades. Any significant changes in the water assets will have major effects on hydrologic procedures and it will influence the economy of the nation and the welfare of its populace (Chattopadhyay and Hulme1997). Precipitation is one of the most important roles in climatic variable, precipitation changes corresponding to climate warming are more undefined (Stockticker IPCC 2013). Rain nourished farming has a particular place in Indian agriculture, possessing 68 % of the aggregate developed region and supporting 40 % of human and 60 % of animals populace (Sharma and Soni 2006). Some past investigations identifying with changes in precipitation over India have reasoned that there is no unmistakable pattern of increment or reduction in normal yearly precipitation over the nation (Mooley & Parthasarathy, 1984; Sarker & Thapliyal, 1988; Thapliyal & Kulshrestha, 1991; Lal, 2001). The Indian subcontinent has warmed by 560 C amid the most recent century
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