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Advisor(s)
Abstract(s)
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) thermophysiological 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.
Description
Keywords
Outdoor thermal comfort Mediterranean city Climate change UTCI Mean radiant temperature LCZ Urban climate Thermal summer
Pedagogical Context
Citation
Reis, C., Nouri, A. S. & Lopes, A. (2023). Human thermo-physiological comfort assessment in Lisbon by local climate zones on very hot summer days. Frontiers in Earth Science, 11, 1099045. https://doi.org/10.3389/feart.2023.1099045
Publisher
Frontiers