Toronto's Urban Heat Island - Exploring the Relationship between Land Use and Surface Temperature

The urban heat island effect is linked to the built environment and threatens human health during extreme heat events. In this study, we analyzed whether characteristic land uses within an urban area are associated with higher or lower surface temperatures, and whether concentrations of “hot” land uses exacerbate this relationship. Zonal statistics on a thermal remote sensing image for the City of Toronto revealed statistically significant differences between high average temperatures for commercial and resource/industrial land use (29.1 °C), and low average temperatures for parks and recreational land (25.1 °C) and water bodies (23.1 °C). Furthermore, higher concentrations of either of these land uses were associated with more extreme surface temperatures. We also present selected neighborhoods to illustrate these results. The paper concludes by recommending that municipal planners and decision-makers formulate policies and regulations that are specific to the problematic land uses, in order to mitigate extreme heat.

[1]  L. Pengelly,et al.  Anatomy of Heat Waves and Mortality in Toronto , 2007, Canadian journal of public health = Revue canadienne de sante publique.

[2]  A. Hudson,et al.  Heat Wave Hazards: An Overview of Heat Wave Impacts in Canada , 2003 .

[3]  N. Wong,et al.  The influence of land use on the urban heat island in Singapore , 2007 .

[4]  H. Taha.  Urban climates and heat islands: albedo, evapotranspiration, and anthropogenic heat , 1997 .

[5]  H. Akbari,et al.  High-albedo materials for reducing building cooling energy use , 1992 .

[6]  H. Akbari.  Energy Saving Potentials and Air Quality Benefits of Urban Heat IslandMitigation , 2005 .

[7]  Hua Zheng,et al.  Spatial pattern of impervious surfaces and their impacts on land surface temperature in Beijing, China. , 2007, Journal of environmental sciences.

[8]  Taiyang Zhong,et al.  Estimation of the relationship between vegetation patches and urban land surface temperature with remote sensing , 2009 .

[9]  D. Streutker,et al.  Satellite-measured growth of the urban heat island of Houston, Texas , 2003 .

[10]  J. Unger.  Connection between urban heat island and sky view factor approximated by a software tool on a 3D urban database , 2009 .

[11]  J. A. Voogta,et al.  Thermal remote sensing of urban climates , 2003 .

[12]  Marie K. Svensson,et al.  Sky view factor analysis – implications for urban air temperature differences , 2004 .

[13]  János Unger,et al.  The relationship between built‐up areas and the spatial development of the mean maximum urban heat island in Debrecen, Hungary , 2005 .

[14]  Rafiq Hamdi,et al.  Estimating Urban Heat Island Effects on the Temperature Series of Uccle (Brussels, Belgium) Using Remote Sensing Data and a Land Surface Scheme , 2010, Remote. Sens..

[15]  M J Maloley.  Thermal remote sensing of urban heat islands: Greater Toronto Area , 2010 .

[16]  J. Robine,et al.  Death toll exceeded 70,000 in Europe during the summer of 2003. , 2008, Comptes rendus biologies.

[17]  N Benbow,et al.  Mortality in Chicago attributed to the July 1995 heat wave. , 1997, American journal of public health.

[18]  D. Yap.  Seasonal excess urban energy and the nocturnal heat island — Toronto , 1975 .

[19]  J. Norman,et al.  Land use planning and surface heat island formation: A parcel-based radiation flux approach , 2006 .

[20]  Région de la Capitale Nationale,et al.  City of Toronto , 2011 .

[21]  H. Frumkin,et al.  Urban Form and Extreme Heat Events: Are Sprawling Cities More Vulnerable to Climate Change Than Compact Cities? , 2010, Environmental health perspectives.

[22]  T. T. Van,et al.  Study of the Impact of Urban Development on Surface Temperature Using Remote Sensing in Ho Chi Minh City, Southern Vietnam , 2010 .

[23]  Limin Yang,et al.  An approach for mapping large-area impervious surfaces: synergistic use of Landsat-7 ETM+ and high spatial resolution imagery , 2003 .

[24]  Hashem Akbari,et al.  Meteorological and air quality impacts of increased urban albedo and vegetative cover in the Greater Toronto Area, Canada , 2002 .

[25]  Claus Rinner,et al.  The Role of Maps in Neighborhood-level Heat Vulnerability Assessment for the City of Toronto , 2010 .

[26]  J. Monteith,et al.  Boundary Layer Climates. , 1979 .

[27]  T. Oke.  The energetic basis of the urban heat island , 1982 .