Green and cool roofs’ urban heat island mitigation potential in European climates for office buildings under free floating conditions

Κολοκότσα, Δ.; Santamouris, M.; Zerefos, Stelios

doi:10.1016/j.solener.2013.06.001

Cited by 171 publications

(74 citation statements)

References 56 publications

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“…Thus, increasing albedo of urban land surfaces has been another practical way for mitigation of UHI, including using retroreflective materials in urban canyons [51] and changing the conventional roofs to the highly reflective roofs with albedos close to 0.7-0.8 [52,53]. For example, compared with "unmanaged" soil moisture, well-managed green roofs with relatively abundant soil moisture will reduce the surface and near-surface UHIs to cool roofs with an albedo value of 0.7 [46].…”

Section: Enhancing Albedo Of Urban Land Surfacesmentioning

confidence: 99%

Characterizing Urban Fabric Properties and Their Thermal Effect Using QuickBird Image and Landsat 8 Thermal Infrared (TIR) Data: The Case of Downtown Shanghai, China

et al. 2016

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Abstract:The combined usage of high-resolution satellite images and thermal infrared (TIR) data helps understanding the thermal effect of urban fabric properties and the mechanism of urban heat island (UHI) formation. In this study, three typical urban functional zones (UFZs) of downtown Shanghai were chosen for quantifying the relationship between fine-scale urban fabric properties and their thermal effect. Nine land surfaces and 146 aggregated land parcels extracted from a QuickBird image (dated 14 April 2014) were used to characterize urban fabric properties. The thermal effect was deduced from land surface temperature (LST), intra-UHI intensity, blackbody flux density (BBFD) and blackbody flux (BBF). The net BBF was retrieved from the Landsat 8 TIR band 10 dated 13 August 2013, and 28 May 2014. The products were resampled to fine resolution using a geospatial sharpening approach and further validated. The results show that: (1) On the UFZ level, there is a significant thermal differential among land surfaces. Water, well-vegetated land, high-rises with light color and high-rises with glass curtain walls exhibited relatively low LST, UHI intensity and BBFD. In contrast, mobile homes with light steel roofs, low buildings with bituminous roofs, asphalt roads and composite material pavements showed inverse trends for LST, UHI intensity, and BBFD; (2) It was found that parcel-based per ha net BBF, which offsets the "size-effect" among parcels, is more reasonable and comparable when quantifying excess surface flux emitted by the parcels; (3) When examining the relationship between parcel-level land surfaces and per ha BBF, a partial least squares (PLS) regression model showed that buildings and asphalt roads are major contributors to parcel-based per ha BBF, followed by other impervious surfaces. In contrast, vegetated land and water contribute with a much lower per ha net BBF to parcel warming.

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Section: Enhancing Albedo Of Urban Land Surfacesmentioning

confidence: 99%

Characterizing Urban Fabric Properties and Their Thermal Effect Using QuickBird Image and Landsat 8 Thermal Infrared (TIR) Data: The Case of Downtown Shanghai, China

et al. 2016

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“…We presented that certain land cover types have significant effect on surface temperature, which is strongly connected to the urban heat island phenomenon, and influences population health. Most of the citizens cannot afford the green and cool roof types -the advantages are in Kolokotsa, D. et al (2013) -, but can choose from a lot of cheaper roof types, which have preferable temperature properties. Based on our results, the application of certain roof material can be recommended to population which can lead to lower surface temperature locally.…”

Section: Discussionmentioning

confidence: 99%

The evaluation and application of an urban land cover map with image data fusion and laboratory measurements

et al. 2017

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High spatial and spectral resolution aerial images make it possible to develop detailed and large-scale (about 1:5,000) urban land cover maps. The main objectives of this study are (1) to evaluate the correlation between laboratory and hyperspectral image spectra to select proper bands and training samples for classification; (2) to develop a classification process to combine the spectral and spatial information of multispectral and hyperspectral images and make an urban land cover map for the study area in Szeged, Hungary; and (3) to examine the effect of different roof types on the modification of surface temperature. Reference materials were collected from the training area and their spectral characteristics were measured by a laboratory spectrometer. The hyperspectral image and laboratory spectral data between 500-800 nm showed a very strong correlation, the correlation coefficient was 0.99. The urban land cover map was produced by the combination of segmentation procedure and Spectral Angle Mapper (SAM) method using the spatial information derived from multispectral image and the spectral information of the hyperspectral image. Eight land cover classes were identified as impervious surfaces (asphalt, 4 types of tiled roof), water, and green vegetation. The overall accuracy of urban land cover map was 87.9 per cent. According to the results, an accurate large-scale urban land cover map can be generated from the fusion of multispectral and hyperspectral images. We presented that certain roof types have significant effect on surface temperature, which is strongly connected to the urban heat island phenomenon, and influences population health.

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“…Urban green spaces cool cities through evapotranspiration and solar control and is associated with the development of cool islands in and around parks and public green spaces [2,18,37,38]. Cool islands created by urban parks offer improved comfort conditions and lower ambient temperatures around them and to a distance equal to their length.…”

Section: Pathway Towards Mitemmentioning

confidence: 99%

The Mitigative Potential of Urban Environments and Their Microclimates

Schiano-Phan

Weber²,

Santamouris

2015

Buildings

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Cities play a crucial role in climate change: More than 50% of the growing population lives in cities producing most of the global GDP but also 78% of greenhouse gases (GHG) responsible for climate change. Moreover, due to their highly modified land-use and intensive activities, cities are at the forefront of the most rapid environmental and climatic change ever experienced by mankind. Yet, cities' potential to mitigate both climate change and their own environment is underexploited. This paper explores ideas related to the potential of urban environments to modify their microclimates, reflecting on the overlapping potential between mitigative and adaptive actions. These actions in cities can not only tackle some of the largest contributing factors to global climate change but offer short-to medium-term benefits that could drive more immediate socioeconomic and behavioral changes. This review proposes and discusses a new preliminary definition of urban environments as microclimate modifiers-Mitigative urban Environments and Microclimates (MitEM)-and calls for further research into: (a) inter-connecting the full range of mitigative and adaptive initiatives already being undertaken in many cities and maximizing their input systemically; (b) developing a common and holistic definition of MitEM; (c) promoting its uptake at policy level and amongst the key stakeholders, based on its social and public value beyond the environmental.

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Green and cool roofs’ urban heat island mitigation potential in European climates for office buildings under free floating conditions

Cited by 171 publications

References 56 publications

Characterizing Urban Fabric Properties and Their Thermal Effect Using QuickBird Image and Landsat 8 Thermal Infrared (TIR) Data: The Case of Downtown Shanghai, China

Characterizing Urban Fabric Properties and Their Thermal Effect Using QuickBird Image and Landsat 8 Thermal Infrared (TIR) Data: The Case of Downtown Shanghai, China

The evaluation and application of an urban land cover map with image data fusion and laboratory measurements

The Mitigative Potential of Urban Environments and Their Microclimates

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