Exploring the Synergies between Urban Overheating and Heatwaves (HWs) in Western Sydney

Hassan Saeed Khan, Riccardo Paolini, Mattheos Santamouris and Peter Caccetta
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Hassan Saeed Khan: Faculty of Built Environment, University of New South Wales (UNSW), Sydney NSW 2052, Australia
Riccardo Paolini: Faculty of Built Environment, University of New South Wales (UNSW), Sydney NSW 2052, Australia
Mattheos Santamouris: Faculty of Built Environment, University of New South Wales (UNSW), Sydney NSW 2052, Australia
Peter Caccetta: Data-61, The Commonwealth Scientific and Industrial Research Organization (CSIRO), Underwood Ave, Floreat, Perth WA 6014, Australia

Energies, 2020, vol. 13, issue 2, 1-17

Abstract: There is no consensus regarding the change of magnitude of urban overheating during HW periods, and possible interactions between the two phenomena are still an open question, despite the increasing frequency and impacts of Heatwaves (HW). The purpose of this study is to explore the interactions between urban overheating and HWs in Sydney, which is under the influence of two synoptic circulation systems. For this purpose, a detailed analysis has been performed for the city of Sydney, while considering an urban (Observatory Hill), in the Central Business District (CBD), and a non-urban station in Western Sydney (Penrith Lakes). Summer 2017 was considered as a study period, and HW and Non-Heatwave (NHW) periods were identified to explore the interactions between urban overheating and HWs. A strong link was observed between urban overheating and HWs, and the difference between the peak average urban overheating magnitude during HWs and NHWs was around 8 °C. Additionally, the daytime urban overheating effect was more pronounced during the HWs when compared to nighttime. The advective flux was found as the most important interaction between urban overheating and HWs, in addition to the sensible and latent heat fluxes.

Keywords: heatwaves; urban overheating; urban heat island intensity; energy budget equation; sensible heat flux; latent heat flux; advective heat flux; Australian climatic conditions; coastal cities; desert climate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (4)

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