Heat Waves Amplify the Urban Canopy Heat Island in Brno, Czechia

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Authors

JANKŮ Zdeněk DOBROVOLNÝ Petr

Year of publication 2022
Type Article in Periodical
Magazine / Source Meteorology
MU Faculty or unit

Faculty of Science

Citation
Web https://www.mdpi.com/2674-0494/1/4/30
Doi http://dx.doi.org/10.3390/meteorology1040030
Keywords mean; maximum and minimum daily temperatures; heat waves; urban heat island; heat magnitude; Brno; Czechia
Description This study used homogenised mean, maximum, and minimum daily temperatures from 12 stations located in Brno, Czechia, during the 2011–2020 period to analyse heat waves (HW) and their impact on the canopy urban heat island (UHI). HWs were recognized as at least three consecutive days with Tx ? 30 °C and urban–rural and intra-urban differences in their measures were analysed. To express the HWs contribution to UHI, we calculated the UHI intensities (UHII) separately during and outside of HWs to determine the heat magnitude (HM). Our results show that all HW measures are significantly higher in urban areas. UHII is mostly positive, on average 0.65 °C; however, day-time UHII is clearly greater (1.93 °C). Furthermore, day-time UHII is amplified during HWs, since HM is on average almost 0.5 °C and in LCZ 2 it is even 0.9 °C. Land use parameters correlate well with UHII and HM at night, but not during the day, indicating that other factors can affect the air temperature extremity. Considering a long-term context, the air temperature extremity has been significantly increasing recently in the region, together with a higher frequency of circulation types that favour the occurrence of HWs, and the last decade mainly contributed to this increase.
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