Dominant control of agriculture and irrigation on urban heat island in India

Show simple item record Kumar, Rahul Mishra, Vimal Buzan, Jonathan R. Kumar, Rohini Shindell, Huber Matthew, Drew 2017-12-06T05:29:03Z 2017-12-06T05:29:03Z 2017-10
dc.identifier.citation Kumar, Rahul; Mishra, Vimal;Buzan, Jonathan; Kumar, Rohini; Shindell, Huber and Matthew, Drew, "Dominant control of agriculture and irrigation on urban heat island in India", Scientific Reports, DOI: 10.1038/s41598-017-14213-2, vol. 7, no. 1, Oct. 2017. en_US
dc.identifier.issn 2045-2322
dc.description.abstract As is true in many regions, India experiences surface Urban Heat Island (UHI) effect that is well understood, but the causes of the more recently discovered Urban Cool Island (UCI) effect remain poorly constrained. This raises questions about our fundamental understanding of the drivers of rural-urban environmental gradients and hinders development of effective strategies for mitigation and adaptation to projected heat stress increases in rapidly urbanizing India. Here we show that more than 60% of Indian urban areas are observed to experience a day-time UCI. We use satellite observations and the Community Land Model (CLM) to identify the impact of irrigation and prove for the first time that UCI is caused by lack of vegetation and moisture in non-urban areas relative to cities. In contrast, urban areas in extensively irrigated landscapes generally experience the expected positive UHI effect. At night, UHI warming intensifies, occurring across a majority (90%) of India's urban areas. The magnitude of rural-urban temperature contrasts is largely controlled by agriculture and moisture availability from irrigation, but further analysis of model results indicate an important role for atmospheric aerosols. Thus both land-use decisions and aerosols are important factors governing, modulating, and even reversing the expected urban-rural temperature gradients.
dc.description.statementofresponsibility by Rahul Kumar, Vimal Mishra, Jonathan Buzan, Rohini Kumar, Drew Shindell and Matthew Huber
dc.format.extent vol. 7, no. 1
dc.language.iso en en_US
dc.publisher Nature Publishing Group en_US
dc.title Dominant control of agriculture and irrigation on urban heat island in India en_US
dc.type Article en_US
dc.relation.journal Scientific Reports

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