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Observations of urban heat island advection from a high-density monitoring network

Research output: Contribution to journalJournal article

Published
  • Richard Bassett
  • Xiaoming Cai
  • Lee Chapman
  • Clare Heaviside
  • John Thornes
  • Catherine Muller
  • Duick Young
  • Elliott Warren
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<mark>Journal publication date</mark>07/2016
<mark>Journal</mark>Quarterly Journal of the Royal Meteorological Society
Issue number699 Part B
Volume142
Number of pages8
Pages (from-to)2434-2441
StatePublished
Early online date8/06/16
Original languageEnglish

Abstract

With 69% of the world's population predicted to live in cities by 2050, modification to local climates, in particular Urban Heat Islands (UHIs), have become a well studied phenomenon. However, few studies have considered how horizontal winds modify the spatial pattern in a process named Urban Heat Advection (UHA) and this is most likely due to a lack of highly spatially resolved observational data. For the first time, this study separates the two-dimensional advection-induced UHI component, including its pattern and magnitude, from the locally heated UHI component using a unique dataset of urban canopy temperatures from 29 weather stations (3 km resolution) recorded over 20 months in Birmingham, United Kingdom. The results show that the mean contribution of UHA to the warming of areas downwind of the city can be up to 1.2 °C. Using the inverse Normalized Difference Vegetation Index as a proxy for urban fraction, an upwind distance at which the urban fraction has the strongest correlation with UHA was demonstrated to be between 4 and 12 km. Overall, these findings suggest that urban planning and risk management needs to additionally consider UHA. However, more fundamentally, it highlights the importance of careful interpretation of long- term meteorological records taken near cities when they are used to assess global warming.