Human thermo-physiological comfort assessment in Lisbon by local climate zones on very hot summer days

Frontiers in Earth Science

Earth Science

A. Santos Nouri¹  Cláudia Reis²  António Lopes³ 

[1] Department of Interior Architecture and Environmental Design, Faculty of Art, Design and Architecture, Bilkent University, Bilkent, Türkiye;University of Lisbon, Centre of Geographical Studies, Institute of Geography and Spatial Planning, Lisbon, Portugal;University of Lisbon, Centre of Geographical Studies, Institute of Geography and Spatial Planning, Lisbon, Portugal;Associated Laboratory Terra, Portugal;

关键词: outdoor thermal comfort;    Mediterranean city;    climate change;    UTCI;    mean radiant temperature;    LCZ;    urban climate;    thermal summer;   

DOI  :  10.3389/feart.2023.1099045

 received in 2022-11-15, accepted in 2023-05-05,  发布年份 2023

来源: Frontiers

【 摘 要 】

Extreme heat is a current and future issue on urban areas, with negative impacts on health and quality of life (increasing morbidity and mortality rates). This paper analyses day (12:00–15:00 h) and nighttime (00:00–03:00 h) thermo-physiological comfort (TC) conditions by Local Climate Zones (LCZ) in Lisbon during a particular Local Weather Type (LWT), very hot summer days. For this, 13 different microscale sample areas were chosen covering urban and non-urban land cover classes (LCZs 1–3, 4–6, 8, 9, A and B). Universal Thermal Climate Index (UTCI) and Mean Radiant Temperature (MRT) were modeled on SkyHelios software for 163 days between 2008 and 2014. Results show that during the day all urban LCZ samples depict the same average TC conditions (average UTCI of 34°C—strong heat stress) and densely wooded areas are 2°C cooler (average UTCI of 32°C—moderate heat stress). However, compact areas (LCZs 1–3) with low sky view factor and some vegetation (street trees) display lower percentages of area with higher thermo-physiological discomfort (TD) levels (83% with strong heat stress against 98% in LCZs 8 and 9 and 100% in LCZs 4–6). When considering the hottest days (air temperatures equal or above 35°C—75th percentile), the moderate heat stress class disappears in all samples and the very strong heat stress class appears only on urban areas, occupying between 12% and 16% on LCZs 1–3, 10%–22% on LCZs 4–6, 16%–22% on LCZs 8 and 9 on LCZ 9. During the nighttime period all samples show no thermal stress, favoring nocturnal physiological recovery. TC conditions in Lisbon are strongly influenced by solar radiation and wind, which explains the need to increase the shading area, preferably by trees, and to promote and preserve ventilation paths.

【 授权许可】

Unknown   
Copyright © 2023 Reis, Nouri and Lopes.