DOI: 10.1016/j.atmosenv.2017.10.038
Scopus记录号: 2-s2.0-85034076487
论文题名: Tailored coefficients in the algorithm to assess reconstructed light extinction at urban sites: A comparison with the IMPROVE revised approach
作者: Valentini S ; , Bernardoni V ; , Massabò D ; , Prati P ; , Valli G ; , Vecchi R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 172 起始页码: 168
结束页码: 176
语种: 英语
英文关键词: IMPROVE algorithm
; Light extinction
; Urban sites
; Visibility
Scopus关键词: Aerosols
; Approximation algorithms
; Light extinction
; Nitrogen compounds
; Optical data processing
; Particulate emissions
; Sulfur compounds
; Visibility
; Water absorption
; Aerosol size distributions
; Discrete dipole approximation
; Interagency monitoring of protected visual environments
; Light extinction coefficients
; Optical measurement
; Particulate Matter
; Pollution episodes
; Urban site
; Urban growth
; ammonium nitrate
; ammonium sulfate
; organic matter
; rain
; absorption
; algorithm
; light effect
; parameterization
; particle size
; particulate matter
; size distribution
; urban site
; visibility
; aerosol
; air
; algorithm
; Article
; comparative study
; dipole
; dry mass
; environmental monitoring
; humidity
; Italy
; light
; optics
; particulate matter
; pressure
; priority journal
; soil
; solar radiation
; temperature
; United States
; urban area
; visibility
; wind
; Italy
; Lombardy
; Milan
; Milano [Lombardy]
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: Estimates of light extinction and visibility are routinely performed by the U.S. Interagency Monitoring of Protected Visual Environments (IMPROVE) network using a simple algorithm which assesses light extinction coefficient (bext) at remote and rural sites from concentrations of major particulate matter (PM) species, NO2, and Rayleigh scattering from clear-air gaseous components. Following the same approach, in this paper an equation with tailored (i.e. site-specific) coefficients was implemented with the aim of reducing uncertainties and assumptions of the IMPROVE algorithm for applications at polluted urban sites. Major differences compared to IMPROVE algorithm are: 1) dry mass extinction efficiencies calculated using a discrete dipole approximation code with aerosol size distributions measured at our monitoring site as input data; 2) site-specific water growth functions computed separately for ammonium sulfate, ammonium nitrate, and organic matter; 3) fine soil evaluated using an equation previously adopted at our urban site; 4) aerosol absorption component assessed directly through filter-based optical measurements. Details about the calculations performed are reported in the paper and the comparison with the IMPROVE revised algorithm is discussed. The tailored approach here proposed to estimate reconstructed light extinction was applied to PM2.5 test samples collected on purpose in Milan (Italy), where heavy pollution episodes occur during winter periods. In addition, visual range was calculated applying the Koschmieder equation and compared to visibility measured at the nearby Milano-Linate airport obtaining a fairly good correlation. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83154
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physics, Università degli Studi di Milano and INFN-Milan, Milan, Italy; Department of Physics, University of Genoa and INFN-Genoa, Genoa, Italy
Recommended Citation:
Valentini S,, Bernardoni V,, Massabò D,et al. Tailored coefficients in the algorithm to assess reconstructed light extinction at urban sites: A comparison with the IMPROVE revised approach[J]. Atmospheric Environment,2018-01-01,172