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DOI	10.5194/acp-20-11893-2020
	Using a coupled large-eddy simulation-aerosol radiation model to investigate urban haze: Sensitivity to aerosol loading and meteorological conditions
	Slater J.; Tonttila J.; Mcfiggans G.; Connolly P.; Romakkaniemi S.; Kühn T.; Coe H.
发表日期	2020
ISSN	16807316
起始页码	11893
结束页码	11906
卷号	20 期号:20
英文摘要	The aerosol-radiation-meteorology feedback loop is the process by which aerosols interact with solar radiation to influence boundary layer meteorology. Through this feedback, aerosols cause cooling of the surface, resulting in reduced buoyant turbulence, enhanced atmospheric stratification and suppressed boundary layer growth. These changes in meteorology result in the accumulation of aerosols in a shallow boundary layer, which can enhance the extent of aerosol-radiation interactions. The feedback effect is thought to be important during periods of high aerosol concentrations, for example, during urban haze. However, direct quantification and isolation of the factors and processes affecting the feedback loop have thus far been limited to observations and low-resolution modelling studies. The coupled large-eddy simulation (LES)-aerosol model, the University of California, Los Angeles large-eddy simulation - Sectional Aerosol Scheme for Large Scale Applications (UCLALES-SALSA), allows for direct interpretation on the sensitivity of boundary layer dynamics to aerosol perturbations. In this work, UCLALES-SALSA has for the first time been explicitly set up to model the urban environment, including addition of an anthropogenic heat flux and treatment of heat storage terms, to examine the sensitivity of meteorology to the newly coupled aerosol-radiation scheme. We find that (a) sensitivity of boundary layer dynamics in the model to initial meteorological conditions is extremely high, (b) simulations with high aerosol loading (220 μgm-3) compared to low aerosol loading (55 μgm-3) cause overall surface cooling and a reduction in sensible heat flux, turbulent kinetic energy and planetary boundary layer height for all 3 d examined, and (c) initial meteorological conditions impact the vertical distribution of aerosols throughout the day. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; boundary layer; concentration (composition); haze; large eddy simulation; radiative transfer; sensitivity analysis; source apportionment; California; Los Angeles [California]; United States
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143894
作者单位	Centre for Atmospheric Sciences, School of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom; Finnish Meteorological Institute, Atmospheric Research Centre of Eastern Finland, Kuopio, Finland; Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
推荐引用方式 GB/T 7714	Slater J.,Tonttila J.,Mcfiggans G.,et al. Using a coupled large-eddy simulation-aerosol radiation model to investigate urban haze: Sensitivity to aerosol loading and meteorological conditions[J],2020,20(20).
APA	Slater J..,Tonttila J..,Mcfiggans G..,Connolly P..,Romakkaniemi S..,...&Coe H..(2020).Using a coupled large-eddy simulation-aerosol radiation model to investigate urban haze: Sensitivity to aerosol loading and meteorological conditions.Atmospheric Chemistry and Physics,20(20).
MLA	Slater J.,et al."Using a coupled large-eddy simulation-aerosol radiation model to investigate urban haze: Sensitivity to aerosol loading and meteorological conditions".Atmospheric Chemistry and Physics 20.20(2020).