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

0570057 - ÚVGZ 2023 RIV CH eng J - Článek v odborném periodiku
Janků, Zdeněk - Dobrovolný, Petr
Heat Waves Amplify the Urban Canopy Heat Island in Brno, Czechia.
Meteorology. Roč. 1, č. 4 (2022), s. 477-494. E-ISSN 2674-0494
Grant CEP: GA MŠMT(CZ) EF16_019/0000797
Institucionální podpora: RVO:86652079
Klíčová slova: mean * maximum and minimum daily temperatures * heat waves heat magnitude * urban heat island * heat magnitude * brno * czechia
Obor OECD: Climatic research
Způsob publikování: Open access
https://www.mdpi.com/2674-0494/1/4/30

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.
Trvalý link: https://hdl.handle.net/11104/0341420