Choudhury: The Role Of Climate Change In Bangladesh

Bangladesh girded in two sides by the Himalayan range and touched by the Bay of Bengal in the south. This geographical position as well as tropical monsoon climate, has made this country is one of the most disaster-prone countries in the world, chancy weather events; poor institutional capacity, insufficient financial resources, and imperfect infrastructure have made Bangladesh highly vulnerable . Anomalous Rainfall is a recurrent feature of the climate and it is common in Bangladesh. The potential impact of rainfall on agriculture is also of great concern. It is related to the inadequate rainfall over an extended period of time, usually for a season or more. This scarcity of drinking and irrigating water in the northwestern parts of the country

Each season consists of two months and they are summer, rainy season, autumn, dry season, winter and spring. However, in reality, the most of the six seasons are overlapped with each other. For example, the rainy season lasts for more than two months and with the exception of nearly three months winter, the summer lasts rest of the year. We have the hottest weather during the so called, spring season. Thus, from the meteorological viewpoint, Bangladesh climate is divided into the following seasons. It has four climatic seasons from the meteorological point of view. They are winter (December–February), Pre-monsoon (March–May), Monsoon (June–September) and Post-monsoon (October–November) (Ahasan et al. 2010). It may mention that in this classification the seasons are not of equal length Monsoon which is actually summer monsoon is of four month 's duration and lasts almost to the middle of October. The winter monsoon is short lived in Bangladesh and is of three months duration from December to February though it becomes quite warm beginning from the middle of February. Pre-monsoon is actually the hottest season of the year and during this period, there is some rainfall accompanied by Nonwestern and hailstorm and often with the recurrence of tornadoes. Rashid (1991) analyzed that the average temperature of the country ranges from 7.20C to 12.80C during winter and 23.9 to 31.10C during

On an average 8-10, low-pressure systems form over the Bay of Bengal during monsoon season. Summer monsoon rainfall over Bangladesh is characterized by significant wet (active) or dry (break) spell on a time scale of about two weeks. Otherwise, NCMRWF (2008) also found that 10 low-pressure systems that include 4 deep depressions, 1 depression, 3 well-marked low-pressure areas, and 2 low- pressure areas were formed over the Bay of Bengal during the period June – September