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Moist heat stress extremes in India enhanced by irrigation
Nature geoscience, 2020-11, Vol.13 (11), p.722-728
[Peer Reviewed Journal]
The Author(s), under exclusive licence to Springer Nature Limited 2020. ;ISSN: 1752-0894 ;EISSN: 1752-0908 ;DOI: 10.1038/s41561-020-00650-8
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Title:
Moist heat stress extremes in India enhanced by irrigation
Author:
Mishra, Vimal
;
Ambika, Anukesh Krishnankutty
;
Asoka, Akarsh
;
Aadhar, Saran
;
Buzan, Jonathan
;
Kumar, Rohini
;
Huber, Matthew
Subjects:
Arid climates
;
Arid regions
;
Atmospheric models
;
Boundary layer height
;
Boundary layers
;
Climate
;
Datasets
;
Dry heat
;
Enthalpy
;
Equipment purchasing
;
Heat
;
Heat flux
;
Heat stress
;
Heat tolerance
;
Heat transfer
;
Humidity
;
Irrigation
;
Meteorological models
;
Monsoon climates
;
Planetary boundary layer
;
Relative humidity
;
Semiarid climates
;
Semiarid zones
;
Sensible heat
;
Sensible heat flux
;
Sensible heat transfer
;
Specific humidity
;
Surface temperature
Is Part Of:
Nature geoscience, 2020-11, Vol.13 (11), p.722-728
Description:
Intensive irrigation in India has been demonstrated to decrease surface temperature, but the influence of irrigation on humidity and extreme moist heat stress is not well understood. Here we analysed a combination of in situ and satellite-based datasets and conducted meteorological model simulations to show that irrigation modulates extreme moist heat. We found that intensive irrigation in the region cools the land surface by 1 °C and the air by 0.5 °C. However, the decreased sensible heat flux due to irrigation reduces the planetary boundary layer height, which increases low-level moist enthalpy. Thus, irrigation increases the specific and relative humidity, which raises the moist heat stress metrics. Intense irrigation over the region results in increased moist heat stress in India, Pakistan, and parts of Afghanistan—affecting about 37–46 million people in South Asia—despite a cooler land surface. We suggest that heat stress projections in India and other regions dominated by semi-arid and monsoon climates that do not include the role of irrigation overestimate the benefits of irrigation on dry heat stress and underestimate the risks. Intensive irrigation in India cools the land surface, but increases the moist heat stress in South Asia, according to an analysis of observational datasets and meteorological models.
Publisher:
London: Nature Publishing Group
Language:
English
Identifier:
ISSN: 1752-0894
EISSN: 1752-0908
DOI: 10.1038/s41561-020-00650-8
Source:
ProQuest Central
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