Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

HAS CLIMATE CHANGE ALREADY AFFECTED THE TEMPORAL TRENDS OF SEASONAL AND ANNUAL PRECIPITATION IN SYLHET DISTRICT OF BANGLADESH? (Pages : 21 - 27)

Understanding the variability in precipitation is an urgent issue for sustainable ecological-societal system under the projected consequences of global warming and climate change. The objective of this study was to document and examining the seasonal and annual pattern of precipitation in Sylhet districts of Bangladesh from daily precipitation data of Sylhet meteorological station for a period of over 40 years (1975-2014). Annually, 40 years average precipitation was 4060±613 mm whereas dry season, pre-monsoon, monsoon and post-monsoon season were 180±121 mm, 941±296 mm, 2695±525 mm and 245±142 mm, respectively. Consequently, dry season, pre-monsoon, monsoon and post-monsoon season on an average explained the 3%, 22%, 70% and 4% of average annual precipitation, respectively. Dry season showed the most inconsistency (coefficient of variation, C.V. 67%) while monsoon season showed the most consistency (C.V. 19%) among the season. Precipitation of this region showed slight decreasing trend by negative slope irrespective of four seasons and all timescales. It indicates that climate change has already affected the temporal trends of seasonal and annual precipitation in Sylhet district. Understanding from this research would be helpful to ameliorate economic damage caused by sudden flash flood during pre-monsoon and monsoon as well as by drought during post-monsoon and dry season through adopting suitable rain water harvesting technology.Download