On the thermal response of buildings under the synergic effect of heat waves and urban heat island

Zinzi, Michele; Agnoli, Stefano; Burattini, Chiara; Mattoni, Benedetta

doi:10.1016/j.solener.2020.10.050

Cited by 58 publications

(35 citation statements)

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“…Li et al (2015) revealed that the UHII is enhanced during HW periods compared to non-HW (NHW) periods in Beijing. Also, consistent synergies between UHIs and HWs have been reported in western Sydney (Khan et al, 2020), Seoul (Ngarambe et al, 2020), Singapore (Mughal et al, 2020), and Rome (Zinzi et al, 2020). Regarding the factors modulating UHIs and HWs, they are complex and vary both spatially and temporally, but can broadly be categorized into natural-type factors (local topography, synoptic weather, meteorological factors such as wind speed, cloud cover, relative humidity, etc.)…”

Section: Introductionmentioning

confidence: 77%

“…For example, relative humidity, cloud cover, precipitation, and other meteorological factors also have an impact on the UHI effect, which may affect the interaction between HWs and UHII. In addition, the atmospheric circulation situation, anthropogenic heat emissions, and the impact of aerosols on the balance of surface radiation are other potential influencing factors of HW events and UHI effects (Li et al, 2015;Yang et al, 2020b;Ngarambe et al, 2020;Zinzi et al, 2020). Therefore, future studies should also consider these factors to explore their influences on HW events and the UHI effect.…”

Section: Discussionmentioning

confidence: 99%

“…and anthropogenic-type factors (i.e., anthropogenic activities such as emissions of anthropogenic heat and aerosols, as well as land use/land cover changes related to rapid urbanization, etc.) (Li et al, 2015;Ngarambe et al, 2020;Zinzi et al, 2020). To some extent, buildings, the surface composition, and pavements also affect the exchanges of heat in cities (Shahidan et al, 2012;Wong et al, 2017;He, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Influence of Local Climate Zones and Wind Speeds on the Urban Heat Island and Heat Waves in the Megacity of Beijing, China

et al. 2021

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Large-scale modifications to urban underlying surfaces owing to rapid urbanization have led to stronger urban heat island (UHI) effects and more frequent urban heat wave (HW) events. Based on observations of automatic weather stations in Beijing during the summers of 2014–2020, we studied the interaction between HW events and the UHI effect. Results showed that the UHI intensity (UHII) was significantly aggravated (by 0.55°C) during HW periods compared to non-heat wave (NHW) periods. Considering the strong impact of unfavorable weather conditions and altered land use on the urban thermal environment, we evaluated the modulation of HW events and the UHI effect by wind speed and local climatic zones (LCZs). Wind speeds in urban areas were weakened due to the obstruction of dense high-rise buildings, which favored the occurrence of HW events. In detail, 35 HW events occurred over the LCZ1 of a dense high-rise building area under low wind speed conditions, which was much higher than that in other LCZ types and under high wind speed conditions (< 30 HW events). The latent heat flux in rural areas has increased more due to the presence of sufficient water availability and more vegetation, while the increase in heat flux in urban areas is mainly in the form of sensible heat flux, resulting in stronger UHI effect during HW periods. Compared to NHW periods, lower boundary layer and wind speed in the HW events weakened the convective mixing of air, further expanding the temperature gap between urban and rural areas. Note that LCZP type with its high-density vegetation and water bodies in the urban park area generally exhibited, was found to have a mitigating effect on the UHI, whilst at the same time increasing the frequency and duration of HW events during HW periods. Synergies between HWs and the UHI amplify both the spatial and temporal coverage of high-temperature events, which in turn exposes urban residents to additional heat stress and seriously threatens their health. The findings have important implications for HWs and UHII forecasts, as well as for scientific guidance on decision-making to improve the thermal environment and to adjust the energy structure.

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Section: Introductionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic Influence of Local Climate Zones and Wind Speeds on the Urban Heat Island and Heat Waves in the Megacity of Beijing, China

et al. 2021

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“…This strong interest is the outcome of harsh heatwaves occurring across the world in the last 20 to 30 years and accompanied by a high rise in morbidity and mortality [5]. Indeed, heat events currently represent some of the most dangerous weather phenomena in the world and threaten not only human health [6,7], but also agriculture [8,9], public infrastructure [10,11], supply of electricity [12], and workplace productivity [13]. The increase in the number of hot days and heatwaves leads to ecological impacts in the form of exacerbated droughts and wildfires [14] as well as increased wildlife mortality [15] that reduce the general level of security in the world and induce economic losses.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variability of Trends in Regional Hot and Warm Temperature Extremes in Europe

Sulikowska

Wypych

2021

Atmosphere

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Extremely hot or warm weather over the course of the year may have significant impacts on many aspects of human life, the economy, and the natural environment. Until now a thorough assessment of changes of extreme heat or warm events in Europe was hindered by the number of metrics employed, time periods examined, and most studies being conducted in the summer season only. Here, we employ the Extremity Index (EI) to investigate long-term trends in extremely hot or warm days in Europe over the course of the year, with a special focus on their frequency, spatial extent, and intensity. An extreme temperature event (ETE) is defined as a day with an unusually high temperature for a given location and season, even if such a temperature would not be considered extremely high in an absolute sense. The research is conducted in five spatial domains that together cover a large portion of Europe. The period of the most recent 70 years is considered. In all examined regions, mainly significant increasing trends since 1950 are evident for seasonal EI; therefore, also for ETE frequency, intensity, and spatial range. Yet, every region is characterized by its own event pattern, and trends across the continent strongly vary geographically and seasonally. Our study highlights that examined trends of temperature extremes are accelerating and in the last 40 years the rate of change has been even more than three times greater than in the entire study period. The greatest changes were noted for the summer season in Central Europe and Eastern Europe for the most recent 40-year period.

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“…Urban heat islands and heat waves have a serious impact on the quality of life of people: on the one hand, these phenomena, changing the environment, affect health; on the other hand, they pose serious problems for construction design when solving the issues of increased energy demand for space cooling and thus worsening the thermal environment indoors [3].…”

Section: Introductionmentioning

confidence: 99%

Factors affecting microclimatic conditions in urban environment

Giyasova

2021

E3S Web Conf.

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Urbanization leads to dramatic changes in urban microclimate, and becomes a serious problem in terms of ensuring comfortable and healthy living of city dwellers. The main factors affecting the microclimate of urban environment are not only the geographical features of cities, but also the density of buildings, the environmental concerns, the thermal response of buildings, the influence of plants and water bodies. The problem of the urban microclimate optimization is multifaceted since various factors affect changes in the urban environment. Thus an integrated multilevel systematic approach to studying the problems of the formation of the urban microclimate is required. Integrating the accumulated knowledge and practices in the research domain with design work is important.

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On the thermal response of buildings under the synergic effect of heat waves and urban heat island

Cited by 58 publications

References 58 publications

Synergistic Influence of Local Climate Zones and Wind Speeds on the Urban Heat Island and Heat Waves in the Megacity of Beijing, China

Synergistic Influence of Local Climate Zones and Wind Speeds on the Urban Heat Island and Heat Waves in the Megacity of Beijing, China

Seasonal Variability of Trends in Regional Hot and Warm Temperature Extremes in Europe

Factors affecting microclimatic conditions in urban environment

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