Significant impacts of heterogeneous reactions on the chemical composition and mixing state of dust particles: A case study during dust events over northern China
Aerosols
; Air pollution
; Air quality
; Dust
; Mixing
; Nitrates
; Nitric acid
; Optical radar
; Pollution
; Sulfur compounds
; Sulfur dioxide
; Air quality prediction
; Anthropogenic aerosols
; Anthropogenic pollutants
; Dust aerosols
; Heterogeneous reactions
; Mixing state
; Optical particle counters
; Secondary inorganic aerosol
; Particles (particulate matter)
; ammonium nitrate
; ammonium sulfate
; air quality
; ammonium nitrate
; ammonium sulfate
; anthropogenic source
; atmospheric modeling
; chemical composition
; chemical pollutant
; chemical reaction
; concentration (composition)
; dust
; mixing ratio
; particle size
; aerosol
; air pollution
; air quality
; Article
; boundary layer
; case study
; chemical composition
; chemical reaction
; China
; comparative study
; concentration (parameters)
; controlled study
; depolarization
; filter
; mineral dust
; particulate matter
; plume
; priority journal
; time series analysis
; weather
; Beijing [China]
; China
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:
The impact of heterogeneous reactions on the chemical components and mixing state of dust particles are investigated by observations and an air quality model over northern China between March 27, 2015 and April 2, 2015. Synergetic observations were conducted using a polarization optical particle counter (POPC), a depolarized two-wavelength Lidar and filter samples in Beijing. During this period, dust plume passed through Beijing on March 28, and flew back on March 29 because of synoptic weather changes. Mineral dust mixed with anthropogenic pollutants was simulated using the Nested Air Quality Prediction Modeling System (NAQPMS) to examine the role of heterogeneous processes on the dust. A comparison of observations shows that the NAQPMS successfully reproduces the time series of the vertical profile, particulate matter concentration, and chemical components of fine mode (diameter�≤�2.5�μm) and coarse mode (2.5�μm�<�diameter�≤�10�μm) particles. After considering the heterogeneous reactions, the simulated nitrate, ammonium, and sulfate are in better agreement with the observed values during this period. The modeling results with observations show that heterogeneous reactions are the major mechanisms producing nitrate reaching 19�μg/m3, and sulfate reaching 7�μg/m3, on coarse mode dust particles, which were almost 100% of the coarse mode nitrate and sulfate. The heterogeneous reactions are also important for fine mode secondary aerosols, for producing 17% of nitrate and 11% of sulfate on fine mode dust particles, with maximum mass concentrations of 6�μg/m3 and 4�μg/m3. In contrast, due to uptake of acid gases (e.g. HNO3 and SO2) by dust particles, the fine mode anthropogenic ammonium nitrate and ammonium sulfate decreased. As a result, the total fine mode nitrate decreased with a maximum of 14�μg/m3, while the total fine mode sulfate increased with a maximum of 2�μg/m3. Because of heterogeneous reactions, 15% of fine mode secondary inorganic aerosols and the entire coarse mode nitrate and sulfate were internally mixed with dust particles. The significant alterations of the chemical composition and mixing state of particles due to heterogeneous reactions are important for the direct and indirect climate effects of dust and anthropogenic aerosols. � 2017 The Authors
Research Institute for Applied Mechanics (RIAM), Kyushu University, Fukuoka, Japan; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing, China; University of Yamanashi, Yamanashi, Japan; National Institute for Environmental Studies (NIES), Tsukuba, Ibaraki, Japan; Fukuoka Institute of Health and Environmental Sciences, Fukuoka, Japan
Recommended Citation:
Wang Z,, Pan X,, Uno I,et al. Significant impacts of heterogeneous reactions on the chemical composition and mixing state of dust particles: A case study during dust events over northern China[J]. Atmospheric Environment,2017-01-01,159