DOI: 10.1016/j.atmosenv.2017.11.011
Scopus记录号: 2-s2.0-85034064832
论文题名: Contrasting aerosol optical and radiative properties between dust and urban haze episodes in megacities of Pakistan
作者: Iftikhar M ; , Alam K ; , Sorooshian A ; , Syed W ; A ; , Bibi S ; , Bibi H
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 173 起始页码: 157
结束页码: 172
语种: 英语
英文关键词: AERONET
; Aerosol
; Dust
; Haze
; MODIS
; Radiative properties
Scopus关键词: Atmospheric aerosols
; Atmospheric radiation
; Dust
; Heat radiation
; Refractive index
; Remote sensing
; AERONET
; Aerosol radiative forcing
; Atmospheric radiative transfer
; Haze
; Log-normal distribution
; MODIS
; Radiative properties
; Single scattering albedo
; Aerosols
; AERONET
; aerosol
; atmospheric modeling
; biomass burning
; dust
; episodic event
; haze
; MODIS
; optical depth
; radiative forcing
; radiative transfer
; remote sensing
; urban area
; aerosol
; Article
; atmosphere
; city
; controlled study
; dust
; haze
; optical depth
; optics
; Pakistan
; priority journal
; radiative forcing
; radius
; refraction index
; Karachi
; Lahore
; Pakistan
; Punjab [Pakistan]
; Sind
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: Satellite and ground based remote sensors provide vital information about aerosol optical and radiative properties. Analysis of aerosol optical and radiative properties during heavy aerosol loading events in Pakistan are limited and, therefore, require in-depth examination. This work examines aerosol properties and radiative forcing during Dust Episodes (DE) and Haze Episodes (HE) between 2010 and 2014 over mega cities of Pakistan (Karachi and Lahore). Episodes having the daily averaged values of Aerosol Optical Depth (AOD) exceeding 1 were selected. DE were associated with high AOD and low Ångström Exponent (AE) over Karachi and Lahore while high AOD and high AE values were associated with HE over Lahore. Aerosol volume size distributions (AVSD) exhibited a bimodal lognormal distribution with a noticeable coarse mode peak at a radius of 2.24 μm during DE, whereas a fine mode peak was prominent at a radius 0.25 μm during HE. The results reveal distinct differences between HE and DE for spectral profiles of several parameters including Single Scattering Albedo (SSA), ASYmmetry parameter (ASY), and the real and imaginary components of refractive index (RRI and IRI). The AOD-AE correlation revealed that dust was the dominant aerosol type during DE and that biomass burning and urban/industrial aerosol types were pronounced during HE. Aerosol radiative forcing (ARF) was estimated using the Santa Barbra DISORT Atmospheric Radiative Transfer (SBDART) model. Calculations revealed a negative ARF at the Top Of the Atmosphere (ARFTOA) and at the Bottom Of the Atmosphere (ARFBOA), with positive ARF within the Atmosphere (ARFATM) during both DE and HE over Karachi and Lahore. Furthermore, estimations of ARFATM by SBDART were shown to be in good agreement with values derived from AERONET data for DE and HE over Karachi and Lahore. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83146
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physics, International Islamic University, Islamabad, Pakistan; Department of Physics, University of Peshawar, Peshawar, Pakistan; Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, United States; Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Iftikhar M,, Alam K,, Sorooshian A,et al. Contrasting aerosol optical and radiative properties between dust and urban haze episodes in megacities of Pakistan[J]. Atmospheric Environment,2018-01-01,173