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Title: Heat wave exposure in India in current, 1.5 °C, and 2.0 °C worlds

Journal Article · · Environmental Research Letters
ORCiD logo [1];  [1];  [2];  [3]
  1. Indian Inst. of Technology (IIT) Gandhinagar (India). Civil Engineering
  2. Helmholtz Centre for Environmental Research - UFZ, Leipzig (Germany)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Heatwaves with large impacts have increased in the recent past and will continue to increase under future warming. However, the implication for population exposure to severe heatwaves remains unexplored. Here, we characterize maximum potential human exposure (without passive/active reduction measures) to severe heatwaves in India. We show that if the global mean temperature is limited to 2.0 °C above pre-industrial conditions, the frequency of severe heatwaves will rise by 30 times the current climate by the end-21st century. In contrast, the frequency is projected to be about 2.5 times more (than the low-warming scenario of 2 °C) under conditions expected if the RCP8.5 'business-as-usual' emissions scenario is followed. Under the 2.0 °C low-warming target, population exposure to severe heatwaves is projected to increase by about 15 and 92 times the current level by the mid and end-21st century respectively. Strategies to reduce population growth in India during the 21st century may provide only limited mitigation of heatwave exposure mostly late in the century. Limiting global temperatures to 1.5 °C above preindustrial would reduce the exposure by half relative to RCP8.5 by the mid-21st century. If global temperatures are to exceed 1.5 °C then substantial measures will be required to offset the large increase in exposure to severe heatwaves in India.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1493248
Journal Information:
Environmental Research Letters, Vol. 12, Issue 12; ISSN 1748-9326
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 77 works
Citation information provided by
Web of Science

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Cited By (12)

Surface Temperature Evaluation and Future Projections Over India Using CMIP5 Models journal May 2019
Spatiotemporal patterns of surface temperature over western Odisha and eastern Chhattisgarh journal August 2019
Real time extended range prediction of heat waves over India journal June 2019
Future projections of heat waves over India from CMIP5 models journal March 2019
Projections of Human Exposure to Dangerous Heat in African Cities Under Multiple Socioeconomic and Climate Scenarios journal May 2019
Comparison of extreme temperature response to 0.5 °C additional warming between dry and humid regions over East–central Asia journal February 2019
Strong Influence of Aerosol Reductions on Future Heatwaves journal May 2019
Projecting Drivers of Human Vulnerability under the Shared Socioeconomic Pathways journal March 2018
A sixfold rise in concurrent day and night-time heatwaves in India under 2 °C warming journal November 2018
Climate Change and Drought: a Perspective on Drought Indices journal April 2018
Decline in surface urban heat island intensity in India during heatwaves journal April 2019
A substantial rise in the area and population affected by dryness in South Asia under 1.5 °C, 2.0 °C and 2.5 °C warmer worlds journal November 2019

Figures / Tables (4)