Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal
Main Author: | |
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Publication Date: | 2021 |
Other Authors: | , , , |
Format: | Article |
Language: | eng |
Source: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Download full: | http://hdl.handle.net/10451/46523 |
Summary: | 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. |
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Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, PortugalUrban heat islandUrban climateHeatwavesLocal climate adaptationMediterranean citiesLisbonUrban thermal signalLisbon 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.MDPIRepositório da Universidade de LisboaOliveira, AnaLopes, AntónioCorreia, EzequielNiza, SamuelSoares, Amílcar2021-02-25T16:32:07Z20212021-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/46523engOliveira, 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, 292. https://doi.org/10.3390/atmos1203029210.3390/atmos120302922073-4433info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:48:54Zoai:repositorio.ul.pt:10451/46523Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:58:42.101696Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
title |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
spellingShingle |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal Oliveira, Ana Urban heat island Urban climate Heatwaves Local climate adaptation Mediterranean cities Lisbon Urban thermal signal |
title_short |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
title_full |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
title_fullStr |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
title_full_unstemmed |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
title_sort |
Heatwaves and Summer Urban Heat Islands: a daily cycle approach to unveil the urban thermal signal changes in Lisbon, Portugalisbon, Portugal |
author |
Oliveira, Ana |
author_facet |
Oliveira, Ana Lopes, António Correia, Ezequiel Niza, Samuel Soares, Amílcar |
author_role |
author |
author2 |
Lopes, António Correia, Ezequiel Niza, Samuel Soares, Amílcar |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Oliveira, Ana Lopes, António Correia, Ezequiel Niza, Samuel Soares, Amílcar |
dc.subject.por.fl_str_mv |
Urban heat island Urban climate Heatwaves Local climate adaptation Mediterranean cities Lisbon Urban thermal signal |
topic |
Urban heat island Urban climate Heatwaves Local climate adaptation Mediterranean cities Lisbon Urban thermal signal |
description |
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. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-02-25T16:32:07Z 2021 2021-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10451/46523 |
url |
http://hdl.handle.net/10451/46523 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
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, 292. https://doi.org/10.3390/atmos12030292 10.3390/atmos12030292 2073-4433 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
MDPI |
publisher.none.fl_str_mv |
MDPI |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799134533266702336 |