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Sheltering Series #9: Projecting the Likely Rise of Future Heat Impacts Under Climate Change for Selected Urban Locations in South and Southeast Asia

Authors: Caspar M. Ammann; Kyoko Ikeda; Ken MacClune

The broad warming observed over the past decades across South Asia is likely to continue into the future. Multi-model projections indicate that mean temperature increases over the area are expected in the range of 2–3°C by 2050 compared to the late 20th century. Human perceived heat—the combination of temperatures with humidity—as expressed through the heat-index is likely to rise by significantly more, possibly 4–7°C, over the same time span. While heat is already an issue for the large fraction of the poor population that suffers from a lack of appropriate shelter and access to basic water and energy, the rapid rise in heat is likely to become an inescapable challenge. As the average daily heat-index reaches human body temperature, lack of cooling will significantly impact economic productivity and pose severely heightened health risks. Although South Asian populations have learned to cope with episodes of heat, future heat events will become relentless as the number of days of excessive heat increases and gaps between heat episodes shrink or even disappear. 

Overall, the heat-season will start earlier in the year and last longer into the fall. Both daily and nighttime temperature and heat will reach unprecedented levels that are difficult to escape without access to active cooling. Daily maxima in the late afternoon can possibly be partially ameliorated through construction of simple forms of shade and through the use of evaporative cooling. For rapidly increasing nighttime minimum temperatures, however, which previously provided natural relief, there is no obvious, simple adaptive measure. A form of active but clean, low-energy cooling will be necessary to help the large populations of urban, peri-urban and even rural poor cope with the coming changes without leading to counterproductive increases in greenhouse gas emissions. 

 


Citation: Ammann, C., Ikeda, K., MacClune, K. (2014). Projecting the Likely Rise of Future Heat Impacts Under Climate Change for Selected Urban Locations in South and Southeast Asia (The Sheltering Series No. 9). Boulder, CO: Institute for Social and Environmental Transition-International.

Funded By: The Climate and Development Knowledge Network (CDKN) Disclaimer: This document is an output from a project funded by the UK Department for International Development (DFID) and the Netherlands Directorate-General for International Cooperation (DGIS) for the benefit of developing countries. However, the views expressed and information contained in it are not necessarily those of or endorsed by DFID, DGIS or the entities managing the delivery of the Climate and Development Knowledge Network, which can accept no responsibility or liability for such views, completeness or accuracy of the information or for any reliance placed on them.


The Sheltering Series describes the background, policy landscape, methodology and approach used by the Sheltering From a Gathering Storm team and highlights key issues that were discovered and explored during the project in India, Pakistan, and Vietnam. Sheltering From a Gathering Storm aims to improve the understanding of the costs and benefits of climate-resilient shelter design, and contribute towards the transformative change necessary to make communities more resilient to future disasters. For more information about the project and other available materials, please see: i-s-e-t.org/SHELTER 

Disclaimer: The Sheltering Series contains preliminary research and findings. These products are disseminated to catalyze discourse on timely issues. Most discussion papers undergo revisions, and some will be published formally in a different format.