Abstract
ISEE-0666 Background: High temperatures have an impact on health however, few studies have addressed the heterogeneity in the impact within urban areas. Ambient temperatures vary considerably within cities and this phenomenon is typically known as urban heat island (UHI). The objective of the present study was to define the UHI in Rome using satellite data and ambient temperatures during summer. The UHI indicator can be used to assess the spatial variation in the impact of heat on health within the urban area of Rome. Methods: AATSR satellite data for the period 2003–2006 were used to define the UHI in Rome with a spatial resolution of 1 km × 1 km. The urban area of Rome covers about 300km2. Cloud-free days were derived combining satellite data and cloud cover observations. A regression model was developed to derive air temperatures from land surface temperatures (LST) for all the urban area. The UHI intensity was calculated as difference between rural and urban temperature values during the evening. Results: The UHI phenomenon identified in Rome was similar in all the 60 cloud-free days considered, suggesting the robustness of our indicator. The warmest areas were concentrated around the urban core extending to the east of the city, with LST values on average +2–3°C higher than the rural area. The UHI indicator accurately discriminated the cooler vegetated areas within the city. This indicator was used to analyze the differential impact of heat on mortality during heat waves in Rome for the period 2003–2006. Mortality and socio-economic status data, by census tract of residence, are considered to indentify “hotspot” which are more at risk during heat waves due to the UHI effect. Air pollution data and dispersion models were also considered. Conclusion: Results from this analysis can be used in public health to intensify prevention measures in at risk areas during heat waves.
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