DOI: 10.1029/2018JD028302
Scopus记录号: 2-s2.0-85049866234
论文题名: The Regional Impact of Urban Heat Mitigation Strategies on Planetary Boundary Layer Dynamics Over a Semiarid City
作者: Song J. ; Wang Z.-H. ; Wang C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 12 起始页码: 6410
结束页码: 6422
语种: 英语
英文关键词: convective available potential energy
; green roof
; planetary boundary layer dynamics
; semiarid city
; urban heat mitigation
; white roof
Scopus关键词: air-soil interaction
; boundary layer
; cooling
; greenspace
; landscape change
; latent heat flux
; moisture transfer
; potential energy
; precipitation (climatology)
; roof
; semiarid region
; sensible heat flux
; urban area
; Arizona
; Phoenix
; United States
英文摘要: The rapid urbanization and associated landscape changes strongly modulate heat and moisture transfer processes on the urban surface as well as in the planetary boundary layer (PBL) via urban land-atmosphere interactions. In this study, we employed the mesoscale Weather Research and Forecasting (WRF) model with realistic urban dynamics to assess the effects of two urban landscaping strategies for urban heat mitigation (viz., green roofs and white roofs) on the PBL dynamics for hot summer periods over a semiarid city, Phoenix of Arizona. Our results show that the effects of green roofs and white roofs on PBL dynamics are markedly different at daytime and nighttime. At daytime, both roofing systems reduce the sensible heat flux significantly by ~150 W/m2, lower the PBL height by ~700 m, and decrease the maximum convective available potential energy (CAPE) by ~40 J/kg over the built terrain. At nighttime, both sensible and latent heat fluxes increase with green roofs by ~4 and ~6 W/m2, respectively. In contrast, with white roofs, a marginal reduction of sensible heat flux by ~4 W/m2 was observed, owing to the remnant effect of daytime cooling. In addition, both roofing systems reduce the CAPE over the urban core but increase the CAPE over the rural surrounding, implying that the use of green or white roofs may potentially enhance the probability of precipitation toward the outskirt of the city. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113685
Appears in Collections: 气候减缓与适应
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作者单位: Arizona State University, School of Sustainable Engineering and the Built Environment, Tempe, AZ, United States; University of Cambridge, Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, Cambridge, United Kingdom; University of Cambridge, Department of Architecture, Cambridge, United Kingdom
Recommended Citation:
Song J.,Wang Z.-H.,Wang C.. The Regional Impact of Urban Heat Mitigation Strategies on Planetary Boundary Layer Dynamics Over a Semiarid City[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(12)