Risks of Pre-Monsoon Extreme Rainfall Events of Bangladesh: Is Anthropogenic Climate Change Playing a Role? (original) (raw)

Trends in extreme rainfall events of Bangladesh

Theoretical and Applied Climatology, 2011

A study of the variability of the extreme rainfall events in Bangladesh during the time period 1958-2007 is presented in this paper. Quality controlled homogeneous daily precipitation records of nine stations distributed over Bangladesh is used for the study. Total fifteen annual and seasonal indices of rainfall are examined. Variability of annual and seasonal rainfall trends is also assessed. The Mann-Kendall statistic and Sen's Slope model are used to measure the trends and the magnitude of the change respectively. A significant increase of annual and pre-monsoon rainfall in Bangladesh is observed. In general, an increasing trend in heavy precipitation days and decreasing trends in consecutive dry days are observed. Significant changes in most of the extreme rainfall indices are observed in the stations situated in Northwest Bangladesh.

Spatial and Temporal Changes of Climatic Variables and Its Impact on Natural Disasters in Bangladesh

American Journal of Environmental Protection, 2014

Bangladesh is confronted with a big challenge to mitigate the significant impact of climate change. Due to the climate change, Bangladesh has already experienced average maximum temperature rising, minimum temperature decreasing, rainfall, relative humidity and cloud coverage decreasing resulting frequent and severe floods, tropical cyclone, extensive river bank erosion and drought. This paper focuses mainly to identify the spatial and temporal changes of climatic variables namely temperature, rainfall, humidity and cloud coverage of Bangladesh using data from Bangladesh Meteorological Department (BMD), Bangladesh Water Development Board (BWDB) and Bangladesh Agricultural Research Institute (BARC) at 32 stations and also find out the adverse impacts of climate change especially on natural disasters of Bangladesh. To determine the climatic variability an inclusive meteorological estimation was carried out for the period of 2007-2011 and the results were compared with the period 1987-1991. The results of the climatic variability show that the average maximum temperature is increasing at a rate of 0.03°C per year but the annual minimum temperature is decreasing at a rate of 0.003°C per year. On the other hand, the annual rainfall, relative humidity and cloud coverage decreased by 0.63 mm, 0.013 percent and 0.007 respectively per year. For these climatic changes during the period 1970 to 2013, one hundred thirty four (134) major and minor cyclones hit the coastal regions of Bangladesh and almost two-third (88) of them hit in the period of 1992-2013 which is very alarming for our survival. On the other hand, it shows that the intensity and frequency of extreme flood events have significantly increased and the most extensive floods in the period

Modeling recent climate change induced extreme events in Bangladesh: a review

Bangladesh is a resourceful and densely populated country that has been experiencing frequent disasters viz. cyclones, tidal surges, floods, salinity intrusions, droughts etc. which cause large damage to lives and properties every year. The frequency and intensity of the extreme events have increased significantly in recent decades due to climate change and global warming. This review paper synthesizes extreme climatic events in Bangladesh in the context of the climate modeling data. The modeling results of extreme events showed significant trends in Bangladesh due to climate change. The results of these climate models are significant to show the importance of climate modeling in Bangladesh and it will help to promote research on climate modeling in least developed countries like Bangladesh. Please cite this article as: Dastagir, M.R., Modeling recent climate change induced extreme events in Bangladesh: a review. Weather and Climate Extremes (2015), http://dx.Weather and Climate Extremes ∎ (∎∎∎∎) ∎∎∎-∎∎∎ Please cite this article as: Dastagir, M.R., Modeling recent climate change induced extreme events in Bangladesh: a review. Weather and Climate Extremes (2015), http://dx.Please cite this article as: Dastagir, M.R., Modeling recent climate change induced extreme events in Bangladesh: a review. Weather and Climate Extremes (2015), http://dx.Please cite this article as: Dastagir, M.R., Modeling recent climate change induced extreme events in Bangladesh: a review. Weather and Climate Extremes (2015), http://dx.Please cite this article as: Dastagir, M.R., Modeling recent climate change induced extreme events in Bangladesh: a review. Weather and Climate Extremes (2015), http://dx.

Drought risk assessment in the western part of Bangladesh

Natural Hazards, 2008

Though drought is a recurrent phenomenon in Bangladesh, very little attention has been so far paid to the mitigation and preparedness of droughts. This article presents a method for spatial assessment of drought risk in Bangladesh. A conceptual framework, which emphasizes the combined role of hazard and vulnerability in defining risk, is used for the study. Standardized precipitation index method in a GIS environment is used to map the spatial extents of drought hazards in different time steps. The key social and physical factors that define drought vulnerability in the context of Bangladesh are identified and corresponding thematic maps in district level are prepared. Composite drought vulnerability map is developed through the integration of those thematic maps. The risk is computed as the product of the hazard and vulnerability. The result shows that droughts pose highest risk to the northern and northwestern districts of Bangladesh.