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Heat waves and urban heat island: What we know and what can be done to mitigate their negative impacts.

Di Sabatino S., Aragao L., Barbano F., Brattich E., Leo L., Possega M., Ruggieri P., Santo M.
  Martedì 13/09   10:00 - 13:00   Aula U - Giuliana Cini Castagnoli   IV - Geofisica e fisica dell'ambiente   Presentazione
The last IPCC report has highlighted that exacerbation of heat waves (HWs) in future years will require specific attention for the consequences on urban heat islands (UHI), given that most cities and especially in the North-American continent, will experience more intense heat waves which may lead to intense UHI. Synergy between HWs and UHI is relevant to set-up strategies to mitigate risks of extreme heat, water scarcity, energy requirements, enhancement of air pollution and many other aspects. The interplay between the two phenomena is not entirely understood. Many studies report partially incoherent outcomes, assessing both the existence and the absence of a synergistic behaviour exacerbating the urban-rural temperature difference during HWs. In this talk we will review the hypotheses and theories explaining the dynamical nature of UHI and HWs together with progress made by our group in modelling and interpreting those phenomena. We will then discuss approaches to mitigate their negative effects using results of a large EU Project (OPERANDUM) devoted to explore the efficacy of nature-based solutions taken as concrete examples to improve resilience of our territories.