A satellite image-based analysis of factors contributing to the green-space cool island intensity on a city scale

Abstract

Urban green spaces provide cooler microclimates and create localized urban cool islands and, as part of an adaption strategy to cope with future urban climate change, have been proposed as a means to mitigate the urban heat island effect. Numerous previous research papers have discussed green-space size, type, and vegetation density, as well as many other factors that might influence green-space cooling effects. However, little has been done with regard to exploring and quantifying the characteristics of the green-space cool island (UCI). It is also largely unknown whether or how the patterns of green space and land use, as well as the adjacent urban thermal environment, affect UCIs. In this paper, based on the satellite image, the land surface temperature (LST) was retrieved and the UCI was first identified, then the UCI intensity, one of the UCI characteristics, is defined and at last multiple linear regression models used to explore and quantify the combined effects of factors related to UCI intensity. The results show that the intensity differed between UCIs, and that it was correlated significantly with the extent of and mean temperature reduction associated with a UCI. Multiple linear regression analysis shows that UCI intensity was affected by areas of forest vegetation and its spatial arrangements, as well as by the composition of the cool island and its neighboring thermal environment. The study validated the suitability of using intensity as an indicator of the UCI. Identifying the UCI as a result of the green-space cooling 2 effect, will help in the management and planning of the spatial arrangement of green spaces in cities to mitigate the effects of the urban heat environment and help cities adapt to the climate change.

Impact of Urban Climate Landscape Patterns on Land Surface Temperature in Wuhan, China

“…From the perspective of landscape ecology, a large number of studies have examined the relationship between land use/land cover (LULC) spatial distribution and LST [10][11][12][13]. However, the conventional LULC classification system is not well suited for urban landscapes.…”

“…However, the conventional LULC classification system is not well suited for urban landscapes. Impervious surface is treated as a single type [13], or may be subdivided into buildings and non-buildings such as Sustainability 2017, 9, 1700; doi:10.3390/su9101700…”

Variação diária do microclima urbano em diferentes tipologias de floresta urbana

“…Criam, portanto, microclimas mais frios ocasionado as ilhas de frescor urbanas (KONG et al, 2014), que são importantes para a saúde humana e sustentabilidade das cidades (CHEN et al, 2014). Além de serem uma estratégia de adaptação para lidar com as mudanças climáticas futuras, atuando na mitigação dos efeitos das ilhas de calor urbana (KONG et al, 2014).…”

Análise Microclimática Das Diferentes Tipologias De Floresta Urbana De Curitiba

“…Além de ser uma estratégia de adaptação para lidar com as mudanças climáticas futuras, a presença de áreas vegetadas na cidade atua na mitigação dos efeitos das ilhas de calor urbana (KONG et al, 2014). Pois quando a vegetação é bem distribuída, o balanço de energia de toda a cidade pode ser modificado pela adição de mais superfícies evapotranspirativas, pois uma maior quantidade de radiação absorvida pode ser utilizada na forma de calor latente e a temperatura urbana pode ser reduzida (YU;HIEN, 2006).…”

“…As áreas urbanas com vegetação proporcionam microclimas mais frios e criam ilhas de frescor urbanas localizadas (KONG et al, 2014), que são importantes para a saúde humana e sustentabilidade das cidades (CHEN et al, 2014). Por isso, várias cidades ao redor do mundo estão buscando aumentar a área verde ou cobertura de vegetação como uma forma de gerir o calor urbano, melhorando simultaneamente a beleza, a biodiversidade e o valor recreativo (ADAMNS; SMITH, 2014).…”