How urbanisation alters the intensity of the urban heat island in a tropical African city.

Due to the combined effects of urban growth and climate change, rapid urbanisation is particularly challenging in African cities. Areas that will house a large proportion of the urban population in the future coincide with where natural hazards are expected to occur, and where hazard risk management...

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Autores principales:	Xueqin Li, Lindsay C Stringer, Sarah Chapman, Martin Dallimer
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dcb574cb119048c489204e185fccae62
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spelling	oai:doaj.org-article:dcb574cb119048c489204e185fccae622021-12-02T20:15:25ZHow urbanisation alters the intensity of the urban heat island in a tropical African city.1932-620310.1371/journal.pone.0254371https://doaj.org/article/dcb574cb119048c489204e185fccae622021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0254371https://doaj.org/toc/1932-6203Due to the combined effects of urban growth and climate change, rapid urbanisation is particularly challenging in African cities. Areas that will house a large proportion of the urban population in the future coincide with where natural hazards are expected to occur, and where hazard risk management institutions, knowledge, and capacity are often lacking. One of the challenges posed by rapid urbanisation is the Urban Heat Island (UHI) effect, whereby urban areas are warmer than the surrounding rural areas. This study investigates urbanisation patterns and alterations in surface UHI (SUHI) intensity for the Kampala urban cluster, Uganda. Analyses show that between 1995 and 2017, Kampala underwent extensive changes to its urban built-up area. From the centre of the city to adjoining non-built up areas in all directions, the urban land cover increased from 12,133 ha in 1995 to 25,389 ha in 2016. The area of SUHI intensity in Kampala expanded significantly over the 15-year period of study, expanding from 22,910 ha in 2003 to 27,900 ha in 2016, while the annual daytime SUHI of 2.2°C in 2003 had decreased to 1.9°C by 2017. Although SUHI intensity decreased in some parts of the city, elsewhere it increased, suggesting that urbanisation does not always lead to a deterioration of environmental conditions. We postulate that urban development may therefore not necessarily create an undesirable impact on local climate if it is properly managed. Rapidly growing cities in Africa and elsewhere should ensure that the dynamics of their development are directed towards mitigating potentially harmful environmental impacts, such as UHI effect through careful planning that considers both bluespaces and greenspaces.Xueqin LiLindsay C StringerSarah ChapmanMartin DallimerPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0254371 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xueqin Li Lindsay C Stringer Sarah Chapman Martin Dallimer How urbanisation alters the intensity of the urban heat island in a tropical African city.
description	Due to the combined effects of urban growth and climate change, rapid urbanisation is particularly challenging in African cities. Areas that will house a large proportion of the urban population in the future coincide with where natural hazards are expected to occur, and where hazard risk management institutions, knowledge, and capacity are often lacking. One of the challenges posed by rapid urbanisation is the Urban Heat Island (UHI) effect, whereby urban areas are warmer than the surrounding rural areas. This study investigates urbanisation patterns and alterations in surface UHI (SUHI) intensity for the Kampala urban cluster, Uganda. Analyses show that between 1995 and 2017, Kampala underwent extensive changes to its urban built-up area. From the centre of the city to adjoining non-built up areas in all directions, the urban land cover increased from 12,133 ha in 1995 to 25,389 ha in 2016. The area of SUHI intensity in Kampala expanded significantly over the 15-year period of study, expanding from 22,910 ha in 2003 to 27,900 ha in 2016, while the annual daytime SUHI of 2.2°C in 2003 had decreased to 1.9°C by 2017. Although SUHI intensity decreased in some parts of the city, elsewhere it increased, suggesting that urbanisation does not always lead to a deterioration of environmental conditions. We postulate that urban development may therefore not necessarily create an undesirable impact on local climate if it is properly managed. Rapidly growing cities in Africa and elsewhere should ensure that the dynamics of their development are directed towards mitigating potentially harmful environmental impacts, such as UHI effect through careful planning that considers both bluespaces and greenspaces.
format	article
author	Xueqin Li Lindsay C Stringer Sarah Chapman Martin Dallimer
author_facet	Xueqin Li Lindsay C Stringer Sarah Chapman Martin Dallimer
author_sort	Xueqin Li
title	How urbanisation alters the intensity of the urban heat island in a tropical African city.
title_short	How urbanisation alters the intensity of the urban heat island in a tropical African city.
title_full	How urbanisation alters the intensity of the urban heat island in a tropical African city.
title_fullStr	How urbanisation alters the intensity of the urban heat island in a tropical African city.
title_full_unstemmed	How urbanisation alters the intensity of the urban heat island in a tropical African city.
title_sort	how urbanisation alters the intensity of the urban heat island in a tropical african city.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/dcb574cb119048c489204e185fccae62
work_keys_str_mv	AT xueqinli howurbanisationalterstheintensityoftheurbanheatislandinatropicalafricancity AT lindsaycstringer howurbanisationalterstheintensityoftheurbanheatislandinatropicalafricancity AT sarahchapman howurbanisationalterstheintensityoftheurbanheatislandinatropicalafricancity AT martindallimer howurbanisationalterstheintensityoftheurbanheatislandinatropicalafricancity
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How urbanisation alters the intensity of the urban heat island in a tropical African city.

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