Spatial distribution and microscale characteristics of the urban heat island in Tel-Aviv, Israel

Saaroni, Hadas; Ben‐Dor, Eyal; Bitan, Arieh; Potchter, Oded

doi:10.1016/s0169-2046(99)00075-4

Cited by 206 publications

(104 citation statements)

References 23 publications

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“…This study, instead, highlights some similarities between Barcelona and Tel Aviv about the urban temperature trend at roof level [31]; the maximum temperature difference between the stations is recorded during the second half of the night (00:00-08:00 LST) and the combined effect of the sea breeze during daytime and the UHI during night time determines a very small diurnal temperature range in the urban area. In effect, in August the temperatures in the Barcelona city centre are even lower than the airport during daytime and only slightly higher during night time.…”

Section: Uhi Intensity At Local Scalementioning

confidence: 59%

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Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Salvati

Roura²,

Cecere

2017

Energy and Buildings

172

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Highlights The maximum urban heat island intensity(UHI) reaches 4.3°C during summer  During daytime, air temperatures at the street level are higher than the roof level  The sea breeze has a positive effect on the roof level temperatures during summer  The UHI determines an average increase of the cooling load between 18% and 28%  The energy impact of the UHI is more relevant for higher solar gains Abstract: The Urban Heat Island (UHI) effect is particularly concerning in Mediterranean zone, as climate change and UHI scenarios foresee a fast growth of energy consumption for next years, due to the widespread of air conditioning systems and the increase of cooling demand. The UHI intensity is thus a key variable for the prediction of energy needs in urban areas.This study investigates the intensity of UHI in Barcelona (Spain), the densest Mediterranean coastal city, and its impact on cooling demand of residential buildings.The experimental analysis is based on temperature data from rural and urban Weather Stations and field measurements at street level. The maximum average UHI intensity is found to be 2.8 °C in winter and 1.7°C in summer, reaching 4.3°C at street level. Simulations performed with EnergyPlus indicate that the UHI intensity increases the sensible cooling load of residential buildings by around 18% to 28%, depending on UHI intensity, amount of solar gains and cooling set point.In the light of the results, the UHI intensity in Mediterranean context should be properly considered in performing energy evaluations for urban contexts, since standard meteorological data from airport weather stations are not found to be accurate enough.

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Section: Uhi Intensity At Local Scalementioning

confidence: 59%

“…For what concern the Mediterranean area, it has to be mentioned also the work carried out in Tel Aviv, Israel, by Saaroni et al [31]; the authors found that the UHI intensity in the coastal city varies between 5°C at street level and only 2.5 °C at roof level, thanks to the mitigating effect of the Sea breeze.…”

Section: Introductionmentioning

confidence: 98%

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Salvati

Roura²,

Cecere

2017

Energy and Buildings

172

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“…Originally, and still most commonly, the term UHI refers to the phenomenon that more urbanized areas have a higher air temperature than their surrounding suburban areas. With the development of thermal infrared remote sensing in the last few decades, UHI can also refer to surface UHI; namely, the difference in land surface temperature (LST) at the urban canopy layer or the urban boundary layer (Buyantuyev and Wu, 2010;Saaroni et al, 2000;Voogt, 2002). The LST is the mean radiative skin temperature, determined by air temperature and long-wave radiation between the surface and the atmosphere (Nichol et al, 2009;Weng, 2009).…”

Section: Introductionmentioning

confidence: 99%

Application of a new integrated landscape index to predict potential urban heat islands

Chen

Zhao

Yao

et al. 2016

Ecological Indicators

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a b s t r a c tStudies on the interactions between urban landscape patterns and land surface temperatures are the key to urban heat island (UHI) mitigation. However, the landscape pattern indices used in previous studies were inconsistent in type and number. Furthermore, few studies combined the composition and configuration indices into one integrated indicator. The description of landscape pattern is thus a great yet rewarding challenge. In this study, we used the integrated location weighted landscape index (LWLI) proposed by Chen et al. (2009) and revised it to indicate potential UHIs. Fifty-six circular landscape samples along four transects were created and the LWLI was derived based on the theory of the GINI index. The LWLI considers the type, composition and configuration of different land covers inside a landscape, where configuration is treated as location weights. The potential UHI was represented by the land surface temperature (LST) of each circle landscape center. The correlation analysis results showed that the LWLI was significantly positively correlated with summer potential UHIs, with a Pearson R equaling 0.736, and barely correlated with winter potential UHI. Moreover, the LWLI was slightly more strongly correlated with potential UHI than composition alone. These correlations weakened as the landscapes grew larger. The linear regression results further revealed that the LWLI explained about 53% of the summer potential UHI, which was slightly better than composition alone (49%). This indicated that the LWLI was as effective in predicting the potential UHI as the combination of several pattern indicators, echoing Tobler's first law of geography, which states that "all things are related, but nearby things are more related than distant things." This study also leaves room for improvement of the index by integrating more environmental/ecological parameters as weights, and for further application of the index in other fields.

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“…The urban heat island (UHI) has been documented thoroughly in recent years on the basis of detailed studies of meteorological data from networks of stations in and around cities of various sizes in different climates -London (Chandler, 1965); Vancouver Oke, 1998, 2000); Tel Aviv (Saaroni et al, 2000); Melbourne (Morris and Simmonds, 2001); Seoul (Kim and Baik, 2002); Athens (Livada et al, 2002); and New York City (Gedzelman et al, 2003), to mention a few. An UHI has also been recorded in Singapore (Goh and Chang, 1999;Chow and Roth, 2006), where high atmospheric humidity and the frequent presence of low, warm clouds result in conditions that do not favor the development of rapid nocturnal cooling associated with heat islands in other climates.…”

Section: Introductionmentioning

confidence: 99%

Intra‐urban differences in canopy layer air temperature at a mid‐latitude city

Erell

Williamson

2006

Intl Journal of Climatology

133

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Abstract:Detailed meteorological measurements were carried out in two urban street canyons in central Adelaide and at two reference sites in a suburban location and at an exposed site near the middle of the city for an extended period of nearly a year. The meteorological records revealed substantial differences between air temperature in the urban street canyons and both reference sites. The nocturnal urban heat island observed in most cities was noted in Adelaide street canyons, too. However, the frequent occurrence of a daytime cool island during summer, albeit much weaker than the night-time phenomenon, is less expected. Both phenomena are attributed at least in part to the increase in surface area participating in energy exchanges with the atmosphere in an urban street canyon compared to a typical rural site, and hence in an increase in the effective thermal mass. The presence of additional thermal mass is manifested not only in the dampening of the diurnal temperature range in the city, but also in a noticeable time lag in the maximum intensity of the daytime cool island. The measurements also demonstrate an observable difference in the daily progression of air temperature between a north-south street canyon and an adjacent east-west oriented street.

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Spatial distribution and microscale characteristics of the urban heat island in Tel-Aviv, Israel

Cited by 206 publications

References 23 publications

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Application of a new integrated landscape index to predict potential urban heat islands

Intra‐urban differences in canopy layer air temperature at a mid‐latitude city

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