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Impact of Climate Change in Bangladesh: Rainfall

M. F. Hossain
Professor (Agriculture)
School of Agriculture and Rural Development, Bangladesh Open University.

Abstract/ Executive Summary:

The objective of this study was to assess the changing trend of annual and monthly rainfall pattern due to climate change in Bangladesh. The updated yearly rainfall data of last 10 years (2002-2011) and monthly rainfall data of five years (2007-2011) for seven selected weather stations of Bangladesh were used in this study. The yearly and monthly total amount of rainfall widely varied over the time and place of the country. Highest yearly rainfall occurred in Sylhet in 2002, 2003, 2004, 2005, 2006, 2008, 2010 and 2011 but Chittagong received the highest in 2007, 2009 and 2011. Maximum amount of yearly total rainfall (4939 mm) was recorded at Sylhet station in 2010 and lowest at Rajshahi station in all the years during 2002 to 2011. The highest average monthly rainfall occured in July followed by June, August and September. Lowest amount of monthly rainfall occured in January followed by December and February. The highest rainfall occurred in monsoon season (June-September) and lowest rainfall in winter season (December-February). Rainfall widely varied over different parts of the country.

Keywords: Climate change, Annual rainfall, Monthly rainfall, Trend

Location: Dhaka, Barisal, Chittagong, Khulna, Rajshahi, Sylhet and Rangpur.

Start Date: 00-00-2002

End Date: 00-00-2011

Program Area: Risk Management in Agriculture

Non-commodity: Rainfall

Objectives:

To assess the trend of annual and monthly rainfall pattern due to climate change in Bangladesh.

Methodology:

In the study, yearly rainfall data of seven selected weather stations of Bangladesh during the period of 2002-2011 (10 years) and monthly data of the period 2007-2011 (5 years) were used as published by Bangladesh Bureau of Statistics (BBS) collected from the Bangladesh Meteorological Department (BMD).The location of the weather stations selected for this study were Dhaka, Barisal, Chittagong, Khulna, Rajshahi, Sylhet and Rangpur. Geographic location of Bangladesh: 20°34^c north latitude to 26°38^cnorth latitude and 88°01^ceast longitude to 92°41^c east longitude. The monthly, seasonal and annual rainfall data were constructed based on the daily rainfall data. From the meteorological point of view, there are four climatic seasons in Bangladesh. They are winter (December–February), Pre-monsoon (March–May), Monsoon (June–September) and Post monsoon (October–November). Variation in the rainfall pattern studied keeping into account the changes in other climatic parameters.

Source of Information: International Journal of Agriculture Innovations and Research Volume 2, Issue 5, ISSN (Online) 2319-1473

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Annual total rainfall of last ten years (2002-2011) did not show any significant changing trends. The monthly total country average rainfall was highest in July followed by June, August and September and lowest in January followed by December and February. The highest rainfall occured in monsoon season (June- September) and lowest in winter season (December-February). Summer/monsoon rainfall widely varied over different parts of the country with lowest over Rajshahi and highest over Chittagong of the country followed by Sylhet.

Knowledge Management: Journal