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

• Autorzy: Al-Obaidi Ilham , Rayburg Scott , Półrolniczak Marek , Neave Melissa

Identyfikatory

DOI

10.12911/22998993/142967

• Języki publikacji: EN

Abstrakty

EN

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 how UHI magnitudes 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.

Słowa kluczowe

EN

climate change; heat island; wind speed; wind direction; seasonal UHI; diurnal UHI

• Wydawca: Polskie Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology
• Czasopismo: Journal of Ecological Engineering
• Rocznik: 2021
• Tom: Vol. 22, nr 11
• Strony: 1--15
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Al-Obaidi Ilham

• Mustansiriyah University, Iraq

• https://orcid.org/0000-0002-0900-9402

autor

Rayburg Scott

• Swinburne University of Technology, Melbourne, Australia

autor

Półrolniczak Marek

• Adam Mickiewicz University, Poland

autor

Neave Melissa

• Centre for Urban Research, RMIT University, Melbourne, Australia

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