ORCID Profile
0000-0002-9103-7321
Current Organisation
UNSW Sydney
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Publisher: Elsevier
Date: 2023
Publisher: MDPI AG
Date: 18-04-2017
DOI: 10.3390/SU9040640
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.SCITOTENV.2022.153071
Abstract: In this study we investigated the association between daily weather types (WTs) and the Urban Heat Island (UHI) in two Mediterranean coastal metropolises. For this purpose, we employed an existing weather type classification scheme and examined which WTs influence or drive the intensity of the UHI. We used the gridded weather typing classification (GWTC), in which meteorological conditions at a single location are categorized in daily WTs. We compared these WTs with the maximum temperature differences between urban centers and rural areas in the two major metropolises of Greece (Athens and Thessaloniki). These metropolises have dissimilar geography and spatial planning as well as their urban climate characteristics have differences. We used two groups of temperature time series on a daily basis. One with high and the other with low temperature differences (upper 5% and lower 5% of the maximum temperature differences (ΔΤ
Publisher: MDPI
Date: 07-06-2021
Publisher: MDPI AG
Date: 18-01-2020
DOI: 10.3390/EN13020470
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.
Publisher: MDPI AG
Date: 26-07-2023
DOI: 10.20944/PREPRINTS202307.1740.V1
Abstract: Due to urban warming, energy demand for cooling buildings is rising. The current study used CitySim to estimate the cooling energy requirements for 40 buildings in Downtown, Dubai using high-resolution climate data from weather research and forecasting (WRF) coupled with single layer urban canopy model (SLUCM). Simulating the four mitigation scenarios allowed for the examination of the reduction in cooling load caused by the addition of greenery at a rate ranging from 25% to 100%. The insulated building's cooling demand reduced by a maximum of 13.89% under 100% GI (M4). Scenario M4 resulted in a reduction of 4.6 kWh/m2 and 3.1 kWh/m2 for the non-insulated and insulated low-rise residential buildings, respectively, while the high-rise buildings saw a reduction of 3.09-4.91 kWh/m2 for the non-insulated and 2.07-3.09 kWh/m2 for insulated buildings. This study offered a potential remedy to deal with the problem of urban heating in subtropical environments.
Publisher: Elsevier BV
Date: 02-2021
Publisher: MDPI AG
Date: 05-09-2023
Publisher: MDPI AG
Date: 03-11-2017
Publisher: Springer Science and Business Media LLC
Date: 24-03-2021
DOI: 10.1038/S41598-021-86089-2
Abstract: Urban overheating (UO) may interact with synoptic-scale weather conditions. The association between meteorological parameters and UO has already been a subject of considerable research, however, the impact of synoptic-scale weather conditions on UO magnitude, particularly in a coastal city that is also near the desert landmass (Sydney) has never been investigated before. The present research examines the influence of synoptic-scale weather conditions on UO magnitude in Sydney by utilizing the newly developed gridded weather typing classification (GWTC). The diurnal, and seasonal variations in suburban-urban temperature contrast (ΔT) in association with synoptic-scale weather conditions, and ΔT response to synoptic air-masses during extreme heat events are investigated in three zones of Sydney. Generally, an exacerbation in UO magnitude was reported at daytime over the years, whereas the nocturnal UO magnitude was alleviated over time. The humid warm (HW), and warm (W) air-masses were found primarily responsible for exacerbated daytime UO during extreme heat events and in all other seasons, raising the mean daily maximum ΔT to 8–10.5 °C in Western Sydney, and 5–6.5 °C in inner Sydney. The dry warm (DW), and W conditions were mainly responsible for urban cooling (UC) at nighttime, bringing down the mean daily minimum ΔT to − 7.5 to − 10 °C in Western Sydney, and − 6 to − 7.5 °C in inner Sydney. The appropriate mitigation technologies can be planned based on this study to alleviate the higher daytime temperatures in the Sydney suburbs.
Publisher: Research Square Platform LLC
Date: 06-10-2022
DOI: 10.21203/RS.3.RS-2080699/V1
Abstract: South Asian cities are now experiencing high-intensity of heatwaves. Heatwaves (HWs) severely threaten human health, particularly in urbanized areas more susceptible to the urban heat island (UHI) effect. Due to climate change, heatwaves are becoming stronger, coupled with the intensity of urbanization, exacerbating the thermal risk for urbanites. Explored the synergistic interaction of UHI with HWs and non-HWs periods were investigated in Lahore city. Lahore's climate is subtropical, with relatively dry, moderate winters and extremely hot summers. The city has a distance of 2,179.55 mi (3,507.65 km) north of the equator. A strong relationship was observed between UHI and heatwaves. Land surface temperature (LST) measured by satellite is a widely used indicator for analyzing heatwaves. It has a wider spatial coverage compared to surface air temperature measured at weather stations. Measured the UHI intensity with both datasets. The UHI was analyzed during HWs and non-heatwaves using the heat index method, while SUHI intensity was analyzed using the MFOZs method. The LULC revealed the change in urban built-up class was 56.87% over the last 24 years. It was observed that a high population density zone has more urban heat island intensity. The peak average temperature difference during heatwave and non-heatwave was 5.15°C. During heatwaves, the difference in peak surface temperature was 14°C in the daytime and 6.74°C at night time.
Publisher: Elsevier BV
Date: 07-2022
Publisher: MDPI AG
Date: 19-07-2017
Location: Saudi Arabia
Start Date: 2015
End Date: 2016
Funder: Deanship of Scientific Research (DSR), King Fahd University of Petroleum and Minerals
View Funded ActivityStart Date: 2015
End Date: 2016
Funder: CRC for Low Carbon Living
View Funded Activity