A detailed analysis of the urban heat island and heat stress dynamics was performed for the city of Antwerp, Belgium. In the summer of 2013, an experimental measurement campaign was conducted with various fixed sampling locations (own data stations) and mobile transects. The surface heat island (SUHI) was visualized and analysed based upon remote sensing LST retrievals from ASTER. These maps were further translated into an estimated level of potential heat stress during the day. Next, the canopy layer heat island was studied by UrbClim model runs in order to perform an analysis of the causes of the UHI in Antwerp and a vulnerability analysis w.r.t. heat stress in the city. Complemented with a number of scenario runs taking into account changing climate conditions and land use projections (2030), the projects results were translated into policy-relevant information.
The figure shows the temperature difference between the urban area and the rural surroudings for each hour of the day, but averaged over an entire summer periode of juli-august 2013. Each of the figure shows in other words the UHI intensity as calculated by UrbClim averaged over the summer for that particular hour of the day, starting from midnight.