Trends in climate change observed under tropical wet and tropical montane climates; A case study from Sri Lanka

Climate change-related changes in temperature and precipitation trends must be investigated at local, regional global levels. Temperature two selected regions having tropical wet montane climates (i.e., Colombo Nuwara Eliya respectively) Sri Lanka were studied for a 30 year period from 1989 to 2019, evaluate the temporal dynamics of climate change. Precipitation analyzed on annual, monthly, seasonal scales, while mean, minimum, maximum temperatures examined annual monthly scales. Decadal time series plots used study decadal variations average precipitation. The extreme events also evaluated. In addition, diurnal range (DTR), cool warm nights, heat index (HI) studied. significance was evaluated using Mann-Kendall test, magnitude slope assessed by Sen’s estimator. Clear statistically significant increasing observed mean under climates, no clear both districts. There decreasing south-west monsoon rainfall, with decrease climate. Increasing November during inter-monsoonal rains) April hottest month) over last decade 2010-2019) Colombo. DTR has significantly decreased three decades A upward trend HI values showed number nights decade.