DOI: 10.1016/j.atmosenv.2015.03.028
Scopus记录号: 2-s2.0-84924977581
论文题名: Time-resolved inorganic chemical composition of fine aerosol and associated precursor gases over an urban environment in western India: Gas-aerosol equilibrium characteristics
作者: Sudheer A ; K ; , Rengarajan R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 109 起始页码: 217
结束页码: 227
语种: 英语
英文关键词: Aerosol composition
; Thermodynamic equilibrium
; Trace gases
Scopus关键词: Aerosols
; Arid regions
; Atmospheric movements
; Inorganic chemicals
; Thermodynamics
; Aerosol composition
; Chemical compositions
; Chemical transport models
; Fine-mode particles
; Liquid water content
; Thermodynamic equilibria
; Thermodynamic equilibrium model
; Trace-gases
; Gases
; aerosol composition
; cation
; concentration (composition)
; equilibrium
; seasonality
; semiarid region
; thermodynamics
; trace gas
; urban atmosphere
; aerosol
; Article
; chemical composition
; controlled study
; environmental temperature
; gas
; humidity
; India
; ion pair chromatography
; limit of detection
; mineral dust
; particle size
; particulate matter
; priority journal
; summer
; urban area
; water content
; winter
; India
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: Inorganic ionic constituents (Na+, NH4+, K+, Mg2+, Ca2+, Cl-, NO3- and SO42-) of PM2.5 and associated trace gases (NH3, HNO3 and HCl) were measured simultaneously by Ambient Ion Monitor - Ion Chromatograph (AIM-IC) system with a time resolution of one hour at an urban location in semi-arid region of western India during summer and winter. The average NH3, HNO3 and HCl concentrations were 11.6±5.0, 2.9±0.8 and 0.15μgm-3, respectively, during winter. During summer, NH3 and HNO3 concentrations were of similar magnitude, whereas HCl concentration was less than ~0.03μgm-3. NH3 concentration exhibited a distinct diurnal variation during both seasons. However, HNO3 did not show a specific diurnal trend during the observation period in both seasons. The data obtained were used to study gas-aerosol equilibrium characteristics using a thermodynamic equilibrium model, ISORROPIA II. The results suggest that NH3 exists in equilibrium between measured fine-mode particle and gas phase with a systematic bias of ~14%, whereas HCl and HNO3 deviate significantly from the modelled data. These observations have implications on thermodynamic equilibrium assumptions used for estimating various aerosol parameters such as liquid water content, pH, etc., thus causing significant bias in chemical transport model results over the study region. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81814
Appears in Collections: 气候变化事实与影响
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作者单位: Geosciences Division, Physical Research Laboratory, Ahmedabad, India
Recommended Citation:
Sudheer A,K,, Rengarajan R. Time-resolved inorganic chemical composition of fine aerosol and associated precursor gases over an urban environment in western India: Gas-aerosol equilibrium characteristics[J]. Atmospheric Environment,2015-01-01,109