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Observed Synergies between Urban Heat Islands and Heat Waves and Their Controlling Factors in Shanghai, China

Journal of applied meteorology and climatology, 2019-09, Vol.58 (9), p.1955-1972 [Peer Reviewed Journal]

2019 American Meteorological Society ;Copyright American Meteorological Society Sep 2019 ;ISSN: 1558-8424 ;EISSN: 1558-8432 ;DOI: 10.1175/JAMC-D-19-0073.1

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Title:
Observed Synergies between Urban Heat Islands and Heat Waves and Their Controlling Factors in Shanghai, China
Author: Ao, Xiangyu ; Wang, Liang ; Zhi, Xing ; Gu, Wen ; Yang, Hequn ; Li, Dan
Subjects: Anthropogenic factors ; Automation ; Cities ; Energy ; Energy flux ; Energy transfer ; Enthalpy ; Fluctuations ; Heat ; Heat flux ; Heat islands ; Heat tolerance ; Heat transfer ; Heat waves ; Latent heat ; Latent heat flux ; Metropolitan areas ; Net radiation ; Partitioning ; Radiation ; Radiation balance ; Relative humidity ; Rural areas ; Sea breezes ; Sensible heat ; Sensible heat flux ; Sensible heat transfer ; Studies ; Suburban areas ; Surface energy ; Surface properties ; Urban areas ; Urban heat islands ; Weather station data ; Weather stations ; Wind ; Wind speed
Is Part Of: Journal of applied meteorology and climatology, 2019-09, Vol.58 (9), p.1955-1972
Description: There is an ongoing debate as to whether the UHI intensity (UHII) is enhanced or dampened under heat waves (HWs). Using a comprehensive dataset including continuous surface energy flux data for three summers (2016–18) and automated weather station data for six summers (2013–18) in Shanghai, China, we find synergies between UHIs and HWs when either a coastal or an inland suburban site is used as the reference site. We further find that during HWs, the increase of net radiation at the urban site is larger than that at the suburban site. More importantly, the latent heat flux is slightly reduced at the urban site but is slightly increased at the suburban site, while the increase of the sensible heat flux is larger at the urban site. This change of surface energy partitioning, together with the increased anthropogenic heat flux during HWs, exacerbates the UHII. The change of surface energy partitioning is consistent with the observed decrease of relative humidity ratio between urban and suburban areas. The UHII is stronger when the regional wind speed is reduced and under sea breeze, both of which are found to be associated with HWs in our study region. This study suggests that there are multiple factors controlling the interactions between UHIs and HWs, which may explain why synergies between UHIs and HWs are only found in certain metropolitan regions and/or under certain HW events.
Publisher: Boston: American Meteorological Society
Language: English
Identifier: ISSN: 1558-8424
EISSN: 1558-8432
DOI: 10.1175/JAMC-D-19-0073.1
Source: Alma/SFX Local Collection
ProQuest Central

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Observed Synergies between Urban Heat Islands and Heat Waves and Their Controlling Factors in Shanghai, China

2019 American Meteorological Society ;Copyright American Meteorological Society Sep 2019 ;ISSN: 1558-8424 ;EISSN: 1558-8432 ;DOI: 10.1175/JAMC-D-19-0073.1

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