Analyzing Changes of Temperature Over Bangladesh Due to Global Warming Using Historic Data

Abstract. Long term changes of near surface air temperature over Bangladesh have been studied using the available historical data collected by the Bangladesh Meteorological Department (BMD). Maximum and minimum daily temperature data of last sixty years (1948-2007) collected from 34 stations of BMD located all over the Bangladesh have been used in this study. It has been found that daily maximum temperature shows a positive trend of increase at a rate of 0.621 ± 0.491 0C per 100 year. The maximum increase occurred during November at a rate of 2.7 0C per 100 year. However, daily minimum temperature shows more significant trend of increase at a rate of 1.536 ± 0.461 0C per 100 year. The maximum increase occurred during February at a rate of 3.4 0C per 100 year. Daily mean temperature shows positive trend of increase at a rate of 1.026 ± 0.403 0C per 100 year. It has been clearly found that temperature of winter season (December to February) has been raised much higher rate than that of summer season (June to August). This study also reveals that temperature has been increase predominantly over the last 30 years (1978-2007) than last 60 years (1948-2007)