Climatic_Condition.pdf - Climatic Condition and Distinctive...

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Climatic Condition and Distinctive Geo-features: Bengal 1 Climatic Condition/Monsoon Wind System: Bengal Dr Aksadul Alam Professor of History University of Dhaka [email protected] The geographical location of ‘Bengal’ dictates its distinct climatic idiosyncrasies. This has influenced and continues to influence, to no inconsiderable extent, the evolution of the demographic history and behavioural pattern of the people of this deltaic land. ‘Bengal’ is predominantly a land of tropical monsoon climate which may be broadly described as moderately warm, equable, and humid. It is influenced by three factors: the mountain wall of the Himalayas in the north and northeast, the Tropic of Cancer passing through the middle of the region, and the Bay of Bengal in the south. The monsoonal wind causes heavy rainfall; the atmosphere is highly humid with water vapour. The natural calamities in the region are frequently caused by the cyclones, flood, high tide, kalbaishakhi , and windstorm. 1 Ahmad Hasan Dani has characterised the cyclone as being a distinctly mentionable climatic feature of ‘Bengal’. The pre-monsoon storms in late spring are a regular feature, but the occasional post-monsoon cyclones in autumn are destructive and disastrous, especially in the coastal area and in the estuary islands. The deep impact that monsoonal wind exerts on the region is because of Bengal’s geographical location: juxtaposition to the Bay of Bengal, and the lie of the surrounding 1 Syed Amirul Islam, Bangla Anchaler Itihas, Notun Dristikone ekti Samiksha, in Bangla, Dhaka: Papyrus, l996, p. l8. Thunderstorm that generally blows over Bangladesh usually in April-May from a northwesterly direction, locally known as Kal-baishakhi . Nor'wester thunderstorm coincides with the setting in of the summer season. It grows when the atmosphere becomes sufficiently unstable because of localised surface heating or other causes. Mesbahus Saleheen, ‘Nor'wester (Kal- Baishakhi)’, Banglapedia , .
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