摘要
基于计算流体力学(CFD)模拟开展了一系列理想数值试验,分析了城市建成区的热力作用对局地环流的影响,模拟结果表明:在没有背景风的情况下,城市热岛效应可破坏海陆环流的固有转换模式,使近地面风场总是在城市建成区上空辐合;在有微弱背景风的情况下,热岛效应也会导致近地层风场出现线型辐合。而城市上空总是容易出现辐合风场,可部分解释城市局地高污染带形成的物理机制。
Based on computational fluid dynamics(CFD) simulation, a series of ideal numerical experiments are carried out to analyze the influence of thermal effect of urban built-up area on local circulation. The results show that in the case of no background wind, urban heat island effect can destroy the inherent conversion mode of land-sea circulation and make wind field converge over urban built-up area;while in the case of weak background wind, urban heat island effect will also lead to line-shaped convergence in the wind field of surface layer. The analysis shows that the existence of urban built-up area will always cause the convergence of wind field near ground, which can partly explain the physical mechanism of local-scale heavy pollution.
作者
李磊
LI Lei(School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai 519082,China;Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary,Zhuhai 519082,China;Key Laboratory of Tropical Atmosphere-Occan System,Ministry of Education,Zhuhai 519082,China)
出处
《热带气象学报》
CSCD
北大核心
2021年第4期521-529,共9页
Journal of Tropical Meteorology
基金
国家自然科学基金项目(42075059)
广东省科技计划项目(科技创新平台类)(2019B121201002)
热带大气海洋系统科学教育部重点实验室开放课题共同资助。
关键词
城市热岛
海陆环流
局地环流
局地污染
CFD
urban heat island
land sea circulation
local-scale circulation
local-scale pollution
CFD
