DOI: 10.1016/j.atmosres.2018.08.010
Scopus记录号: 2-s2.0-85052329107
论文题名: Idealized large-eddy simulation study of interaction between urban heat island and sea breeze circulations
作者: Shen L. ; Sun J. ; Yuan R.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 214 起始页码: 338
结束页码: 347
语种: 英语
英文关键词: Ascending motion
; Boundary layer height
; Large-eddy simulation
; Sea breeze
; Urban heat island
Scopus关键词: Atmospheric temperature
; Boundary layer flow
; Boundary layers
; Heat flux
; Rural areas
; Surface roughness
; Thermal pollution
; Ascending motion
; Boundary layer heights
; Diurnal variation
; Horizontal temperature gradient
; Sea breeze
; Sea breeze circulation
; Surface heat fluxes
; Urban heat island
; Large eddy simulation
; atmospheric circulation
; boundary layer
; heat island
; large eddy simulation
; sea breeze
; surface flux
; temperature gradient
英文摘要: In this study, large-eddy simulations (LES) are conducted to investigate the interaction between the urban heat island (UHI) circulation and the sea breeze (SB) circulation. An idealized city, which has higher surface heat flux and lager roughness length than the rural surface, is located adjacent to or at a distance from the coastline. The heat flux over both rural and urban surfaces varies sinusoidally with time to mimic the diurnal variation of surface heating. Five urban cases (with differences in city size, location, surface heating strength, and surface roughness) and one non-urban case are simulated. The results show that the SB circulation is enhanced by stronger surface heating in urban area, which leads to a larger SB velocity, a deeper SB thickness, and a stronger ascending motion over the SB front. Moreover, the ascending motion over the SB front is significantly enhanced when it meets the updraft of the UHI circulation, and the maximum ascending motion occurs when the SB front enters the core of the updraft of the UHI circulation. Larger city size delays the occurrence of the maximum ascending motion. Higher surface drag contributes to the enhancement of the ascending motion of SB circulation by intensifying horizontal temperature gradient near the SB front. On the other hand, when the SB flow occupies the urban area, the boundary layer height rapidly decreases to a much lower level, and the UHI circulation is eliminated. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108763
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Regional Climate Center of Shenyang, Shenyang, 110166, China; School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
Recommended Citation:
Shen L.,Sun J.,Yuan R.. Idealized large-eddy simulation study of interaction between urban heat island and sea breeze circulations[J]. Atmospheric Research,2018-01-01,214