DOI: 10.1016/j.atmosenv.2015.07.020
Scopus记录号: 2-s2.0-84938094436
论文题名: Observation and simulation study of atmospheric aerosol nonsphericity over the Loess Plateau in northwest China
作者: Tian P ; , Cao X ; , Zhang L ; , Wang H ; , Shi J ; , Huang Z ; , Zhou T ; , Liu H
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 117 起始页码: 212
结束页码: 219
语种: 英语
英文关键词: Aerosol nonsphericity
; Aspect ratio
; Depolarization ratio
; Lidar
; Precipitable water
; SACOL
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric radiation
; Depolarization
; Earth atmosphere
; Normal distribution
; Optical properties
; Optical radar
; Aerosol optical property
; Depolarization ratio
; Linear depolarization ratios
; Log-normal distribution
; Non sphericities
; Precipitable water
; SACOL
; Spatial and temporal distribution
; Aspect ratio
; aerosol property
; lidar
; numerical model
; optical property
; parameterization
; polarization
; precipitable water
; seasonal variation
; spatiotemporal analysis
; water vapor
; aerosol
; Article
; atmosphere
; autumn
; China
; depolarization
; normal distribution
; priority journal
; seasonal variation
; signal noise ratio
; simulation
; spring
; summer
; sun
; troposphere
; water vapor
; winter
; China
; Loess Plateau
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Aerosol nonsphericity, which is not well depicted in model calculations, seriously affects aerosol optical properties and subsequently alters the radiative forcing of the earth-atmosphere system. Based on aerosol backscattering linear depolarization ratio data observed by a polarization lidar at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) from September 2009 to August 2012 and numerical computations, the spatial and temporal distribution of the aerosol depolarization ratio, parameterization of the derived aspect ratio and influence of water vapor on aerosol nonsphericity were investigated. Aerosol nonsphericity varied considerably by season, with a pronounced maximum in the spring, when more nonspherical aerosols were transported upward to the free troposphere; moreover, the column-averaged lidar depolarization ratios were 0.13, 0.09, 0.08 and 0.10 for the spring, summer, autumn and winter, respectively. The derived aerosol aspect ratio, a simplified parameter that describes the particle nonsphericity, ranged from 1.00 to 1.30 and peaked at approximately 1.06. A modified log-normal function, which was fitted to the frequency distribution of the derived aspect ratios, yielded a log-normal distribution parameterization for this parameter and provided a better shape input for the aerosol optical modeling. The monthly averaged aspect ratios reached a maximum of 1.13 during the spring and a minimum of 1.04 in autumn. The depolarization ratios decreased significantly with column-integrated increasing precipitable water in summer when there was sufficient precipitable water. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81611
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China
Recommended Citation:
Tian P,, Cao X,, Zhang L,et al. Observation and simulation study of atmospheric aerosol nonsphericity over the Loess Plateau in northwest China[J]. Atmospheric Environment,2015-01-01,117