engleski

Urban heat island of Zagreb - first mobile measurements

As a result of urbanisation, cities develop a special type of climate called urban climate, which is characterized by occurrence of Urban Heat Island (UHI), a significantly higher temperature in densely built part of the city than in the rural surrounding areas. Resulting heat difference can lead to negative health consequences and the impairment of quality of life of the population. Additionally, impacts of UHI are seen through decreased air quality, formation of less dense fog, increased smog occurrence, shifting of phenological phases (occurring earlier), etc. Also, UHI can play a significant role in energy management throughout the year as we would expect less energy needed in winter for heating, but more in summer for cooling. The anthropogenic heat sources in densely built cities are not negligible. All cities including Zagreb develop UHI. To better determine characteristics of UHI, its intensity and spatial distribution, it is necessary to have as much as possible of data collected from a city area. For that reason, first mobile measurements of air temperature were organised in Zagreb. The measurements were done using bicycles to increase spatial coverage. The air temperature of the UHI was measured at the height of approximately 2 m from the ground level. Here we will show how the measurements were organised and performed. Collected temperature data and their comparison with land surface temperature (LST) obtained from Landsat-8 satellite are presented. A more detailed analysis of LST in the domain of the city of Zagreb was also made, with the purpose of identifying additional heat sources in the city. The aim of the study is to show the difference in heat load between different morphological features in the city. This study emphasizes the importance of green areas to mitigate the UHI effect.

urban heat island, mobile measurements, land surface temperature, Zagreb

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