On the definition of urban heat island intensity: the â€œruralâ€ reference

Martín‐Vide, Javier; Sarricolea, Pablo; Moreno-García, M. Carmen

doi:10.3389/feart.2015.00024

Cited by 81 publications

(52 citation statements)

References 8 publications

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“…There is not an universal criteria for calculating the intensity of urban heat islands [4,[31][32][33]. In many studies, such calculation was performed by subtracting the temperature recorded in the urban area from the temperature recorded at weather stations or airports.…”

Section: Methodology and Data Analysismentioning

confidence: 99%

The Urban Heat Island Effect and the Role of Vegetation to Address the Negative Impacts of Local Climate Changes in a Small Brazilian City

Alves¹,

Lopes

2017

Atmosphere

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This study analyzes the influence of urban-geographical variables on determining heat islands and proposes a model to estimate and spatialize the maximum intensity of urban heat islands (UHI). Simulations of the UHI based on the increase of normalized difference vegetation index (NDVI), using multiple linear regression, in Iporá (Brazil) are also presented. The results showed that the UHI intensity of this small city tended to be lower than that of bigger cities. Urban geometry and vegetation (UI and NDVI) were the variables that contributed the most to explain the variability of the maximum UHI intensity. It was observed that areas located in valleys had lower thermal values, suggesting a cool island effect. With the increase in NDVI in the central area of a maximum UHI, there was a significant decrease in its intensity and size (a 45% area reduction). It is noteworthy that it was possible to spatialize the UHI to the whole urban area by using multiple linear regression, providing an analysis of the urban set from urban-geographical variables and thus performing prognostic simulations that can be adapted to other small tropical cities.

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Section: Methodology and Data Analysismentioning

confidence: 99%

The Urban Heat Island Effect and the Role of Vegetation to Address the Negative Impacts of Local Climate Changes in a Small Brazilian City

Alves¹,

Lopes

2017

Atmosphere

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“…a limited number of land-based stations. Furthermore, geographic factors, such as elevation, distance from the sea, may influence on the observed temperature (Martin-Vide et al, 2015).…”

Section: Uhi Intensitymentioning

confidence: 99%

Numerical study on regional climate change due to the rapid urbanization of greater Ho Chi Minh City's metropolitan area over the past 20 years

Doan

Kusaka

2015

Intl Journal of Climatology

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This study examines climatic impact of urbanization on the variability of the urban heat island (UHI) effect over Greater Ho Chi Minh City metropolitan area (GHCM), since the late 1980s, using the dynamical downscaling with very high‐resolution regional climate model coupled to an urban canopy model (RCM/UCM). This is the first application of RCM/UCM to a city in developing countries in Southeast Asia in assessing the impacts of the past land‐use and anthropogenic heat release during the selected three periods (ca. 1989, 1999, and 2009). The main findings are as follows: First, agreement between simulated results (for case of ca. 2009 urban) and observation demonstrates that the RCM/UCM is able to reproduce the urban climate of GHCM. Second, the evolution of spatial distribution of UHI is closely associated with urban expansion. The increase in the surface air temperature was about 0.3 °C in the pre‐existing urbanized area and about 0.6 °C in newly urbanized area in the last 20 years. Main factor of these changes is conversion of agriculture or grassland into urban structure, which results in increase in sensible heating and decrease in latent heating. In addition, in the central GHCM, the urbanization impact was estimated at 0.31 °C, while the temperature increase was observed at 0.64 °C in the last 20 years. This suggests that the urbanization may contribute about half to the increase of surface air temperature in the central GHCM.

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“…The first approach (∆Tu-r) compares the temperature of the warmest location in the urban area with the temperature of a location in the rural area that is seen as the coolest. Brazilian cities are characterized by complex urban morphologies, and therefore defining what is actually 'urban' and 'rural' is not an easy task [1], since those adjectives may have different connotations. Consequently, there may be urban areas that are not the warmest, and thus the heating of non-urban areas cannot be disregarded from the analysis.…”

Section: Introductionmentioning

confidence: 99%

Urban Heat Island and Park Cool Island Intensities in the Coastal City of Aracaju, North-Eastern Brazil

Anjos

Lopes

2017

Sustainability

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Abstract:In this study, an evaluation of the Urban Heat Island (UHI) and Park Cool Island (PCI) intensities in Aracaju, North-Eastern Brazil, was performed. The basis of our evaluation is a 2-year dataset from the urban climatological network installed with the principles and concepts defined for urban areas related to climatic scales, sitting and exposure, urban morphology, and metadata. The current findings update UHI intensities in Aracaju refuting the trend registered in previous studies. On average, the UHI was more intense in the cool season (1.3 • C) than in hot season (0.5 • C), which was caused by wind speed decrease. In relation to the PCI, mitigation of high air temperatures of 1.5-2 • C on average was registered in the city. However, the urban park is not always cooler than the surrounding built environment. Consistent long-term monitoring in the cities is very important to provide more accurate climatic information about the UHI and PCI to be applied in urban planning properly, e.g., to provide pleasant thermal comfort in urban spaces.

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On the definition of urban heat island intensity: the â€œruralâ€ reference

Cited by 81 publications

References 8 publications

The Urban Heat Island Effect and the Role of Vegetation to Address the Negative Impacts of Local Climate Changes in a Small Brazilian City

The Urban Heat Island Effect and the Role of Vegetation to Address the Negative Impacts of Local Climate Changes in a Small Brazilian City

Numerical study on regional climate change due to the rapid urbanization of greater Ho Chi Minh City's metropolitan area over the past 20 years

Urban Heat Island and Park Cool Island Intensities in the Coastal City of Aracaju, North-Eastern Brazil

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On the definition of urban heat island intensity: the â€œruralâ€ reference

Cited by 81 publications

References 8 publications

The Urban Heat Island Effect and the Role of Vegetation to Address the Negative Impacts of Local Climate Changes in a Small Brazilian City

The Urban Heat Island Effect and the Role of Vegetation to Address the Negative Impacts of Local Climate Changes in a Small Brazilian City

Numerical study on regional climate change due to the rapid urbanization of greater Ho Chi Minh City's metropolitan area over the past 20 years

Urban Heat Island and Park Cool Island Intensities in the Coastal City of Aracaju, North-Eastern Brazil

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Product

Resources

About

On the definition of urban heat island intensity: the â€œruralâ€ reference