Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities

Urban regions are well known to be warmer than the outlying surrounding regions: this phenomenon is termed an urban Heat Island (UHI). Depending upon its severity, an UHI can influence human health, the condition of urban vegetation, as well as air and water quality leading to a general decline in t...

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Autores principales:	Ilham Al-Obaidi, Scott Rayburg, Marek Półrolniczak, Melissa Neave
Formato:	article
Lenguaje:	EN
Publicado:	Polish Society of Ecological Engineering (PTIE) 2021
Materias:	climate change heat islands wind speed and wind direction seasonal and diurnal uhi Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/cc967c8250354b938579a79e9f0e9c3d
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spelling	oai:doaj.org-article:cc967c8250354b938579a79e9f0e9c3d2021-11-04T08:03:23ZAssessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities2299-899310.12911/22998993/142967https://doaj.org/article/cc967c8250354b938579a79e9f0e9c3d2021-12-01T00:00:00Zhttp://www.jeeng.net/Assessing-the-Impact-of-Wind-Conditions-on-Urban-Heat-Islands-in-Large-Australian,142967,0,2.htmlhttps://doaj.org/toc/2299-8993Urban regions are well known to be warmer than the outlying surrounding regions: this phenomenon is termed an urban Heat Island (UHI). Depending upon its severity, an UHI can influence human health, the condition of urban vegetation, as well as air and water quality leading to a general decline in the living conditions of the affected urban environments and residents. Some studies have shown that prevailing weather conditions, like wind patterns, can influence UHI magnitudes. These studies suggest that wind speeds may be inversely related to UHI magnitude. However, long-term and high frequency weather and temperature measurements are exceedingly rare, so the exact nature of the relationship between wind speeds and directions as well as UHI magnitudes remain unknown. In order to address this problem, this study investigates howUHImagnitudes in five Australian cities affect wind speed and wind direction. The results of this study revealed that urban–non-urban temperature differences are most pronounced under calm weather conditions. The UHI intensity weakened as wind velocity increased: strong significant negative correlations were found between the mean UHI intensity and mean wind speed magnitudes. The results show that the greatest UHI intensities are recorded when wind is weak (less than 2 ms-1), while the lowest magnitudes are found when wind speeds exceed 6 ms-1. Further, the results show that the critical wind speed value, above which the strength of the UHI is considerably minimized, is around 4-5 ms-1. In addition, the study shows that wind direction in each city is a critical driver factor that determines the intensity of the UHI effect. When winds originate from dry environments, they favour high UHI intensities at all wind speeds, while the winds from the ocean side of coastal cities tend to cool urban regions, reducing UHI intensities or even promoting the urban cool island formation.Ilham Al-ObaidiScott RayburgMarek PółrolniczakMelissa NeavePolish Society of Ecological Engineering (PTIE)articleclimate changeheat islandswind speed and wind directionseasonal and diurnal uhiEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENJournal of Ecological Engineering, Vol 22, Iss 11, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	climate change heat islands wind speed and wind direction seasonal and diurnal uhi Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
spellingShingle	climate change heat islands wind speed and wind direction seasonal and diurnal uhi Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Ilham Al-Obaidi Scott Rayburg Marek Półrolniczak Melissa Neave Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
description	Urban regions are well known to be warmer than the outlying surrounding regions: this phenomenon is termed an urban Heat Island (UHI). Depending upon its severity, an UHI can influence human health, the condition of urban vegetation, as well as air and water quality leading to a general decline in the living conditions of the affected urban environments and residents. Some studies have shown that prevailing weather conditions, like wind patterns, can influence UHI magnitudes. These studies suggest that wind speeds may be inversely related to UHI magnitude. However, long-term and high frequency weather and temperature measurements are exceedingly rare, so the exact nature of the relationship between wind speeds and directions as well as UHI magnitudes remain unknown. In order to address this problem, this study investigates howUHImagnitudes in five Australian cities affect wind speed and wind direction. The results of this study revealed that urban–non-urban temperature differences are most pronounced under calm weather conditions. The UHI intensity weakened as wind velocity increased: strong significant negative correlations were found between the mean UHI intensity and mean wind speed magnitudes. The results show that the greatest UHI intensities are recorded when wind is weak (less than 2 ms-1), while the lowest magnitudes are found when wind speeds exceed 6 ms-1. Further, the results show that the critical wind speed value, above which the strength of the UHI is considerably minimized, is around 4-5 ms-1. In addition, the study shows that wind direction in each city is a critical driver factor that determines the intensity of the UHI effect. When winds originate from dry environments, they favour high UHI intensities at all wind speeds, while the winds from the ocean side of coastal cities tend to cool urban regions, reducing UHI intensities or even promoting the urban cool island formation.
format	article
author	Ilham Al-Obaidi Scott Rayburg Marek Półrolniczak Melissa Neave
author_facet	Ilham Al-Obaidi Scott Rayburg Marek Półrolniczak Melissa Neave
author_sort	Ilham Al-Obaidi
title	Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
title_short	Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
title_full	Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
title_fullStr	Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
title_full_unstemmed	Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
title_sort	assessing the impact of wind conditions on urban heat islands in large australian cities
publisher	Polish Society of Ecological Engineering (PTIE)
publishDate	2021
url	https://doaj.org/article/cc967c8250354b938579a79e9f0e9c3d
work_keys_str_mv	AT ilhamalobaidi assessingtheimpactofwindconditionsonurbanheatislandsinlargeaustraliancities AT scottrayburg assessingtheimpactofwindconditionsonurbanheatislandsinlargeaustraliancities AT marekpołrolniczak assessingtheimpactofwindconditionsonurbanheatislandsinlargeaustraliancities AT melissaneave assessingtheimpactofwindconditionsonurbanheatislandsinlargeaustraliancities
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Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities

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