A carregar...
Publicação
Heatwaves and summer urban heat islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugal
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 4.81 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Lisbon is a European Mediterranean city, greatly exposed to heatwaves (HW), according
to recent trends and climate change prospects. Considering the Atlantic influence, air temperature
observations from Lisbon’s mesoscale network are used to investigate the interactions between
background weather and the urban thermal signal (UTS) in summer. Days are classified according
to the prevailing regional wind direction, and hourly UTS is compared between HW and non‐HW
conditions. Northern‐wind days predominate, revealing greater maximum air temperatures (up to
40 °C) and greater thermal amplitudes (approximately 10 °C), and account for 37 out of 49 HW days;
southern‐wind days have milder temperatures, and no HWs occur. Results show that the wind
direction groups are significantly different. While southern‐wind days have minor UTS variations,
northern‐wind days have a consistent UTS daily cycle: a diurnal urban cooling island (UCI) (often
lower than –1.0 °C), a late afternoon peak urban heat island (UHI) (occasionally surpassing 4.0 °C),
and a stable nocturnal UHI (1.5 °C median intensity). UHI/UCI intensities are not significantly
different between HW and non‐HW conditions, although the synoptic influence is noted. Results
indicate that, in Lisbon, the UHI intensity does not increase during HW events, although it is
significantly affected by wind. As such, local climate change adaptation strategies must be based on
scenarios that account for the synergies between potential changes in regional air temperature and
wind.
Descrição
Palavras-chave
Urban heat island Urban climate Heatwaves Local climate adaptation Mediterranean cities Lisbon Urban thermal signal
Contexto Educativo
Citação
Oliveira, A., Lopes, A., Correia, E., Niza, S., & Soares, A. (2021). Heatwaves and summer urban heat islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugal. Atmosphere, 12(3), 292. https://doi.org/10.3390/atmos12030292
Editora
MDPI