Increase of Heat Index over Bangladesh: Impact of Climate Change

Authors: Mohammad Adnan Rajib, Md.Rubayet Mortuza, Saranah Selmi, Asif Khan Ankur, Md. Mujibur Rahman

Abstract:

Heat Index describes the combined effect of temperature and humidity on human body. This combined effect is causing a serious threat to the health of people because of the changing climate. With climate change, climate variability and thus the occurrence of heat waves is likely to increase. Evidence is emerging from the analysis of long-term climate records of an increase in the frequency and duration of extreme temperature events in all over Bangladesh particularly during summer. Summer season has prolonged while winters have become short in Bangladesh. Summers have become hotter and thus affecting the lives of the people engaged in outdoor activities during scorching sun hours. In 2003 around 62 people died due to heat wave across the country. In this paper Bangladesh is divided in four regions and heat index has been calculated from 1960 to 2010 in these regions of the country. The aim of this paper is to identify the spots most vulnerable to heat strokes and heat waves due to high heat index. The results show upward trend of heat index in almost all the regions of Bangladesh. The highest increase in heat index value has been observed in areas of South-west region and North-west Region. The highest change in average heat index has been found in Jessore by almost 5.50C.

Keywords: Anomaly, Heat index, Relative humidity, Temperature

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1082207

References:

[1] Y. Aggarwal, B. M. Karan., B. N. Das., and R. K. Sinha., "Prediction of Heat-Illness symptoms with the prediction of human vascular response in hot environment using rescuing condition," J Med Syst, vol. 32, pp. 167-176, 2007.
[2] S. Islam, Banglapedia, National Encyclopedia of Bangladesh, Board of Editors, Asiatic Society of Bangladesh, Dhaka, Bangladesh, Jan 2003.
[3] Q. Z. Chaudhary and G. Rasul., "Agro-Climatic classification of Pakistan," Science Vision, vol. 9, no. 1-2, Jul-Dec 2003 & no. 3-4 (Jan- Jun 2004), pp. 59-66.
[4] T. L. Delworth, J. D. Mahlman., and T. R. Knutson, "Changes in heat index associated with CO2-indused global warming," Kluwer Academic publishers, Netherland, pp. 369-386, 1999.
[5] L. P. Rothfusz, The heat index equation. Technical attachment, Scientific Services Division NWS Southern Region Headquarters, Fort Worth, TX, SR 90-23, 1990.
[6] S. Shahid, "Spatial and temporal characteristics of droughts in the western part of Bangladesh," Hydrological Processes, vol. 22, issue 13, Jun 2008, pp. 2235-2247
[First published online in Wiley InterScience, Nov 2007].
[7] R. G. Steadman, "The assessment of sultriness. Part I: A temperature humidity index based on human physiology and clothing science," Journal of Applied Meteorology, vol. 18, pp. 861- 873, Jul 1979.
[8] R. G. Steadman, "A universal scale of apparent temperature", Journal of Climate and Applied Meteorology, vol. 23, pp. 1674 - 1687, 1984.
[9] S.C. Sheridan and L.S. Kalkstein, "Health watch/warning systems in urban areas", World Resource Review, vol. 10, pp. 375-383. 1998.