ISSN: 2577-4050
Authors: Siddiq MAB* and Rahaman Chowdhury MZ
Bangladesh is one of the most disaster prone countries in the world and is a victim of frequent natural calamities like tropical cyclones, tornadoes, floods, storm surges and droughts. Sea surface temperature (SST) plays a vital role in determining oceanatmosphere interaction. In this study we focused on understanding the SST variability prevailed in the region of Bay of Bengal (BoB) mainly to assume the surface temperature signature for cyclone occurrence and also assess the variations of monthly climatological T-S (Temperature-Salinity) Diagrams. For this study, the observed SST data during the years 2001-2017 were derived from MODIS (Moderate Resolution Imaging Spectroradiometer) satellite. The SST maps of BoB were produced using SAGA GIS software. Throughout the study period of Bay of Bengal the usual water averaged mean temperature ranges from 25.46°C to 28.15°C. The maximum change found in May 0.65°C and minimum in September 0.06°C of two halves of investigation period. The seasonal cycle of SST showed two warming period during April-May and October. Overall scenario of SST demonstrates an increasing trend. River run-off and rainfall causes the change of salinity distribution near the coast which changesthe monthly T-S scatter density. High scatter density of T-S observed in winter season which indicates less fresh water input. Less scatter of T-S observed in monsoon period which indicates huge freshwater input during the season. Moderate scatter observed in rest of the month indicates optimum freshwater input. Near the cost of Bangladesh, India and Mayanmar, salinity becomes less because of freshwater discharge from local land area which causes change of T-S scatter pattern.
Keywords: Bay of Bengal; Cyclone; Density; Sea Surface Temperature
