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• W1970470677 abstract "Abstract Urban areas have a high sensitivity to extreme temperature events such as heatwaves due to increased absorption and re-radiation of thermal energy from man-made materials as well as anthropogenic heat outputs. Variations in urban form, land use, and surface cover result in spatial variability in temperatures across urban areas, meaning that exposure to extreme events is variable at the sub-city scale. Such variability must be quantified in order to better understand urban temperature interactions and identify areas with the greatest potential exposure to extreme heatwave events. Earth observed data offer a spatially complete and homogenous data source to supplement observations from sparse weather station networks in order to quantify the spatial temperature variability across cities. This article presents an evaluation of the thermal data acquired by the Advanced Very High Resolution Radiometer (AVHRR) instrument to quantify the spatial temperature dynamics of London. A total of 81 cloud-free AVHRR scenes from summers between 1996 and 2006 were analysed in association with air temperature measurements from four London weather stations in order to characterize the year-on-year temperature dynamics of London. The data were employed to investigate the viability of using AVHRR scenes to distinguish a heatwave year from background years using the commonly employed urban heat island intensity (UHII) metric. Results show that AVHRR thermal data are highly sensitive to local meteorological and diurnal effects, requiring temporal averaging to the monthly and seasonal scales to provide robust data for a comparison between different years. Resulting UHII scenes highlight the spatial variability of intensity across London. However, comparison of UHII scenes between summers indicates that the UHII metric is a relatively poor means by which to distinguish between a heatwave summer in London and the 75th percentile, median, and 25th percentile summer temperatures of the time series investigated. Acknowledgements This work was funded by a UK Engineering and Physical Sciences Research Council (EPSRC) PhD studentship, awarded to Tomas Holderness. Additionally, Dundee Satellite Receiving Station (A UK Natural Environment Research Council facility (NERC)) is acknowledged for generating and providing the original AVHRR data sets. The Remote Sensing and Photogrammetry Society is acknowledged for the award of their travel bursary for travel to the First International Conference on Sustainable Urbanisation, 2010, Hong Kong, China, where this work was initially presented." @default.
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• W1970470677 date "2012-10-02" @default.
• W1970470677 modified "2023-10-01" @default.
• W1970470677 title "An evaluation of thermal Earth observation for characterizing urban heatwave event dynamics using the urban heat island intensity metric" @default.
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• W1970470677 doi "https://doi.org/10.1080/01431161.2012.714505" @default.
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