SPATIAL AND TEMPORAL VARIABILITY OF PRECIPITATION IN SOUTHWESTERN BANGLADESH

Abstract

 A study of the variability of precipitation in space and time has been carried in southwestern Bangladesh. Quality controlled homogenous daily precipitation data of 9 stations for the period of 1981-2010 are used for the study. A total of 9 indices and monthly mean are examined. Mann−Kendall test in conjunction with Theil−Sen’s slope method has been used to reveal the significance of trends and quantify their magnitudes. A significant increasing trend in consecutive dry days is observed. An increasing trend of annual maximum consecutive 5-day precipitation is also observed. A projected trend in near future (2020-2050) is analysed using three general circulation models under two representative concentration pathway scenarios. In coming days, it is anticipated to have wetter monsoon and drier winter.