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A review of the formation, mitigation strategies from 50 years of global urban heat island studies

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Abstract

Urban heat islands (UHIs) are inadvertent climatic phenomena stemming from anthropogenic activities that pose a formidable challenge as urbanization is an inescapable reality. Hence, UHI-related concerns have garnered critical relevance in research endeavours. This report highlights the findings from global UHI research over the previous 50 years (1973–2022), while, UHIs have been extensively investigated globally, employing a multitude of methodologies spanning from satellite remote sensing to microclimate simulations involving computational fluid dynamics. The report first elucidates the elements that contribute to UHI formation based on findings from over 190 research publications. These elements are intrinsically linked to the morphology of the built environment, including urban geometry, height-to-width ratio, sky view factor, urban materials, and vegetation cover. The report further covers the mitigation measures proposed by researchers worldwide. Mitigation strategies have primarily focused on urban shading, augmenting green spaces, and modifying surface material properties. It discusses how local development control regulations were observed to modulate the factors responsible for UHI formation. Since UHIs exert influence at both macro and micro scales, the study encompasses research conducted at these levels. Finally, it is recommended that future studies investigate the dynamics of the relationship between development control regulations (DCR) and UHI formation. It suggests formulating algorithms capable of forecasting UHI intensity in the post-implementation scenario of DCR. These algorithms should account for factors such as floor space index (FSI), ground coverage norms, open space regulations, height limitations, vertical and horizontal surface material albedo guidelines, and leaf area index (LAI) of green cover.

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The authors did not receive support from any organization for the submitted work. No funding was received to assist with the preparation of this manuscript. No funding was received for conducting this study. No funds, grants, or other support was received.

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The authors other than the corresponding author contributed equally in the proof reading and critical analysis of the manuscript.

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Correspondence to Vandana Tiwari Srivastava.

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Srivastava, V.T., Sharma, A. & Jadon, S.S. A review of the formation, mitigation strategies from 50 years of global urban heat island studies. Environ Dev Sustain (2024). https://doi.org/10.1007/s10668-024-04966-y

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