CR prepress abstract  -  DOI: https://doi.org/10.3354/cr01508

Temperature differences among local climate zones established by mobile measurements: two central European cities

Michal Lehnert*, Jan Geletič, Petr Dobrovolný, Martin Jurek

*Email: michal.lehnert@gmail.com

ABSTRACT: Air temperature in urban areas is strongly influenced by the properties of surface cover, material, structure and by human activity. Stewart & Oke (2012) quantified these properties and used them to introduce the definition of local climate zones (LCZs). LCZs shall express characteristic temperature regimes of differing local-scale areas and are supposed to be generic; however, their link to characteristic temperatures needs to be established based on field measurements. In this contribution we investigated the link between LCZs and temperature in two Central European cities of Brno and Olomouc, which differ in their topography, relief, morphology and size. We delineated LCZs applying a clearly-defined algorithm which uses data on the physical properties of the environment. In the next step we performed night-time mobile air temperature measurements and examined the differences between and within the LCZs. The results show that during calm and clear weather the order of LCZ temperature was LCZ 2 > LCZ 5 > LCZ 8 > LCZ 6 > LCZ 9 > LCZ A ≈ LCZ D in Brno and LCZ 2 > LCZ 5 > LCZ 8 ≈ LCZ 6 ≈ LCZ 9 > LCZ B > LCZ D in Olomouc. Temperature differences between LCZs, as well as their significance, were more pronounced in the larger of the two cities (Brno). Similarly, intra-class temperature variability was generally higher in the larger city with a more complex topography. Overall, this study supports the general LCZ temperature patterns and thus the validity of the whole concept of LCZs.