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

Mishra, Vimal; Mukherjee, Sourav; Kumar, Rohini; Stone, Dáithí A.

doi:10.1088/1748-9326/aa9388

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

Journal Article · Mon Oct 16 00:00:00 EDT 2017 · Environmental Research Letters

DOI:https://doi.org/10.1088/1748-9326/aa9388· OSTI ID:1493248

^[1]; Mukherjee, Sourav ^[1]; Kumar, Rohini ^[2]; Stone, Dáithí A. ^[3]

Indian Inst. of Technology (IIT) Gandhinagar (India). Civil Engineering
Helmholtz Centre for Environmental Research - UFZ, Leipzig (Germany)
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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1493248

Journal Information:: Environmental Research Letters, Journal Name: Environmental Research Letters Journal Issue: 12 Vol. 12; ISSN 1748-9326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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