EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Understanding within-city interaction between surface and air temperatures

Marzie Naserikia1, Melissa A. Hart1, Negin Nazarian1,2,3, Benjamin Bechtel4, and Kerry A. Nice5
Marzie Naserikia et al.
  • 1Australian Research Council Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, Australia
  • 2School of Built Environment, University of New South Wales, Sydney, Australia
  • 3City Futures Research Centre, University of New South Wales, Sydney, Australia
  • 4Department of Geography, Ruhr-University Bochum, Bochum, Germany
  • 5Transport, Health, and Urban Design Research Lab, Faculty of Architecture, Building, and Planning, University of Melbourne, Melbourne, Australia

Urban heat is a local scale warming effect associated with urban areas where most of the world's population live. Due to the scarcity of air temperature (Ta) data, urban heat studies have been mostly focused on Land Surface Temperature (LST) extracted from satellite imagery and a quantitative understanding of how LST interacts with Ta within a city is still lacking. Using crowdsourced weather station data in Sydney, Australia, combined with high resolution satellite images and urban datasets (such as Local Climate Zone (LCZ) and building-level urban data), we explore the interaction between Ta and LST, and their intra-urban variabilities during different seasons. We found that LST and Ta have different characteristics and their dependency varies by season and LCZ. When exploring the relationship between Ta, LST, and variables describing the urban structure, such as building fraction, the correlation between LST and urban structure was stronger and more seasonal dependent than the Ta-urban form relationship. Moreover, stronger correlations between LST and Ta were observed in the less built-up areas within the city. We also found that the determinants of LST variability are different from the contributing factors of Ta. These findings provide new insights for quantitatively investigating surface and canopy urban heat and their relationship with land cover, providing fit-for-purpose information to mitigate the adverse effects of urban overheating at local and global scales. 

How to cite: Naserikia, M., Hart, M. A., Nazarian, N., Bechtel, B., and Nice, K. A.: Understanding within-city interaction between surface and air temperatures, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-10461,, 2023.