The effect of urban leaf area on summertime urban surface kinetic temperatures: A Terre Haute case study |
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| Affiliation: | 1. Department of Geography, Brigham Young University, 690 SWKT, Provo, UT 84602, USA;2. Department of Geography, Geology, and Anthropology, Indiana State University, Terre Haute, IN 47809, USA;1. Instituto de Biotecnología y Ecología Aplicada, Universidad Veracruzana, Av. de las Culturas Veracruzanas No. 101, Col. Emiliano Zapata, C.P. 91090, Xalapa, Veracruz, Mexico;2. Instituto de Ecología A.C., Carretera Antigua a Coatepec No. 351, El Haya, C.P. 91070, Xalapa, Veracruz, Mexico;1. School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia;2. Cooperative Research Centre for Water Sensitive Cities, Melbourne, Australia;1. Sustainable Consumption Institute (SCI), Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK;2. Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK;1. School of Property, Construction, and Project Management, RMIT University, Melbourne, Australia;2. Sustainable Building Innovation Laboratory (SBi Lab), RMIT University, Melbourne, Australia;3. Department of Civil Engineering, Architecture and Built Environment, Coventry University, Coventry, UK;1. Chair for Forest Growth and Yield Science, School of Life Sciences Weihenstephan, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany;2. Chair for Strategic Landscape Planning and Management, School of Life Sciences Weihenstephan, Technische Universität München, Emil-Ramann-Str. 6, 85354 Freising, Germany |
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| Abstract: | The urban heat island effect (UHIE) has been documented in many temperate region cities. One cause of the UHIE is the replacement of green spaces with impervious materials as urbanization commences and the city builds up and fills in. During the summer, elevated urban temperatures result in increased electricity usage, higher pollution levels, and greater resident discomfort. Through evapotranspiration and the interception of solar radiation, increasing urban tree canopy cover can help mitigate the UHIE. While this is universally accepted, the exact statistical relationship between urban leaf area (as measured by leaf area index, LAI) and urban temperatures has not been extensively studied. In a case study conducted in urban/suburban Terre Haute, Indiana, USA, simple linear regression was employed to quantify the relationship between in situ ceptometer LAI measurements and surface kinetic temperatures (SKTs) measured using thermal satellite imagery acquired at 1100 local time. For the 143 sample sites located in the study area, LAI accounted for 62% of the variation in surface temperature. For every unit increase in LAI, surface temperature decreased by 1.2 °C. |
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