Trend Analysis of Rainfall and Air Temperature in Andaman & Nicobar Islands, India
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Authors
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SIRISHA ADAMALA
ICAR-Central Island Agricultural Research Institute, Port Blair - 744 105, Andaman and Nicobar Islands, India
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A VELMURUGAN
ICAR-Central Island Agricultural Research Institute, Port Blair - 744 105, Andaman and Nicobar Islands, India
Keywords:
Climate change, Coastal region, Island, Mann-Kendall test, Trend analysisAbstract
Andaman and Nicobar Islands of India by its location in the Andaman Sea to the East and the Bay of Bengal to the West are one of the most vulnerable zones to climate change. Temporal trends of weather parameters such as rainfall and air temperature of Port Blair (11°40'0.01" N Latitude, 92°45'0" E Longitude and elevation 16 m above mean sea level) representing Andaman and Nicobar Islands were analysed by non-parametric modified Mann-Kendall and Sen's slope methods. Long term monthly rainfall and air temperature data of (1949-2019) was used to detect a trend. The results from trend analysis indicated that Port Blair receives a mean annual rainfall of 3079.1 mm (±487.3 mm) with a considerable variation (CV = 15.8%). The results revealed that total annual rainfall decreased nonsignificantly at the rate of 0.195 mm yr-1. On an average 150 rainy days in a year were recorded in the region, whereas during the last ten years (2010-2019), the number of rainy days was reduced to 143 days. There was a significant increase in maximum, minimum and mean temperature of the region at the rate of 0.009, 0.015, and 0.012°C yr-1, respectively. This kind of information on long term trends of rainfall and temperatures are useful in evolving climate-resilient agricultural and water conservation plan for that region.
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