气候变化领域集成服务门户(CCPortal): An observational study of the boundary-layer entrainment and impact of aerosol radiative effect under aerosol-polluted conditions

CCPortal

DOI	10.1016/j.atmosres.2020.105348
	An observational study of the boundary-layer entrainment and impact of aerosol radiative effect under aerosol-polluted conditions
	Liu C.; Huang J.; Tao X.; Deng L.; Fang X.; Liu Y.; Luo L.; Zhang Z.; Xiao H.-W.; Xiao H.-Y.
发表日期	2020
ISSN	0169-8095
英文摘要	Aerosols exert a profound impact on the atmospheric boundary layer (ABL) structures and entrainment processes. However, observational analysis of entrainment under heavily polluted condition is rarely documented due to insufficient measurements. In this study, vertical profiles of potential temperature, water vapor, and particulate matter with aerodynamic diameter smaller than 2.5 μm (PM2.5) measured by unmanned aerial vehicle (UAV), LiDAR-measured extinction coefficients, as well as surface observations are presented to investigate the impact of aerosol radiative effect on entrainment processes under heavy aerosol pollution conditions. Results show that aerosol radiative effect reduces surface heat fluxes and influences entrainment substantially. Observations indicate that the column-like plume rise structure is the instigator accounting for the entrainment processes observed during daytime. A well-established entrainment zone identified in the nighttime (e.g., 02:00 local standard time, LST) is mainly due to strong wind shear generating turbulence. The parameters describing entrainment processes are largely modified by aerosol radiative effect. Specifically, the jumps of scalars on the heavy pollution day are much larger than that on the clean day. Entrainment zone thickness enlarges substantially as PM2.5 concentrations increase. The bin-averaged ratios of entrainment to surface heat fluxes are close to a constant (about 0.21) but show a large standard deviation with aerosol pollution conditions. The dimensionless entrainment velocity does not follow the −1 power-law relationship with Richardson number for the heavily polluted conditions, which is consistent with the previous large-eddy simulation (LES) results. This observational study provides valuable evidence in support of high-resolution modeling studies of entrainment with heavily-polluted aerosol conditions. © 2020 Elsevier B.V.
英文关键词	Aerosol radiative effect; Atmospheric boundary layer; Entrainment; UAV
语种	英语
scopus关键词	Aerosols; Antennas; Atmospheric boundary layer; Boundary layer flow; Heat flux; Large eddy simulation; Unmanned aerial vehicles (UAV); Water pollution; Aerodynamic diameters; Entrainment velocities; Entrainment zone thickness; Extinction coefficients; High-resolution models; Observational analysis; Potential temperature; Power law relationship; Air pollution
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145235
作者单位	Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution/School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang, 330013, China; Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology, Nanjing, 210044, China; Ecological Meteorology Center, Jiangxi Meteorological Bureau, Nanchang, 330096, China
推荐引用方式 GB/T 7714	Liu C.,Huang J.,Tao X.,et al. An observational study of the boundary-layer entrainment and impact of aerosol radiative effect under aerosol-polluted conditions[J],2020.
APA	Liu C..,Huang J..,Tao X..,Deng L..,Fang X..,...&Xiao H.-Y..(2020).An observational study of the boundary-layer entrainment and impact of aerosol radiative effect under aerosol-polluted conditions.Atmospheric Research.
MLA	Liu C.,et al."An observational study of the boundary-layer entrainment and impact of aerosol radiative effect under aerosol-polluted conditions".Atmospheric Research (2020).