DOI: 10.1016/j.atmosenv.2013.08.062
Scopus记录号: 2-s2.0-84897105603
论文题名: Measurements of submicron aerosols at the California-Mexico border during the Cal-Mex 2010 field campaign
作者: Levy M ; E ; , Zhang R ; , Zheng J ; , Tan H ; , Wang Y ; , Molina L ; T ; , Takahama S ; , Russell L ; M ; , Li G
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 88 起始页码: 308
结束页码: 319
语种: 英语
英文关键词: Aerosol
; Air pollution
; Black carbon
; Border region
; Mexico
; US
Scopus关键词: Aerosols
; Air pollution
; Mixtures
; Aerosol particle mass analyzers
; Aerosol size distributions
; Black carbon
; Border regions
; Condensation particle counters
; Me-xico
; Tandem differential mobility analyzers
; US
; Particle size
; black carbon
; diesel fuel
; gasoline
; growth factor
; hygroscopic growth factor
; unclassified drug
; volatile agent
; volatility growth factor
; absorption
; aerosol
; black carbon
; concentration (composition)
; condensation
; hygroscopicity
; instrumentation
; measurement method
; particulate matter
; volatilization
; absorption
; aerosol
; aerosol particle mass analyzer
; air pollutant
; air pollution
; analyzer
; antenna
; article
; atmospheric dispersion
; chemical analyzer
; chemical composition
; condensation particle counter
; controlled study
; diesel engine
; laser nephelometer
; measurement
; Mexico
; molecular weight
; optics
; particle size
; particulate matter
; priority journal
; United States
; volatility tandem differential mobility analyzer
; wettability
; California
; Mexico [North America]
; United States
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: We present measurements of submicron aerosols in Tijuana, Mexico during the Cal-Mex 2010 field campaign. A suite of aerosol instrumentations were deployed, including a hygroscopic-volatility tandem differential mobility analyzer (HV-TDMA), aerosol particle mass analyzer (APM), condensation particle counter (CPC), cavity ring-down spectrometer (CRDS), and nephelometer to measure the aerosol size distributions, effective density, hygroscopic growth factors (HGF), volatility growth factors (VGF), and optical properties. The average mass concentration of PM0.6 is 10.39±7.61μgm-3, and the derived average black carbon (BC) mass concentration is 2.87±2.65μgm-3. There is little new particle formation or particle growth during the day, and the mass loading is dominated by organic aerosols and BC, which on average are 37% and 27% of PM1.0, respectively. For four particle sizes of 46, 81, 151, and 240nm, the measured particle effective density, HGFs, and VGFs exhibit distinct diurnal trends and size-dependence. For smaller particles (46 and 81nm), the effective density distribution is unimodal during the day and night, signifying an internally mixed aerosol composition. In contrast, larger particles (151 and 240nm) exhibit a bi-modal effective density distribution during the daytime, indicating an external mixture of fresh BC and organic aerosols, but aunimodal distribution during the night, corresponding to an internal mixture of BC and organic aerosols. The smaller particles show a noticeable diurnal trend in the effective density distribution, with the highest effective density (1.70gcm-3) occurring shortly after midnight and the lowest value (0.90gcm-3) occurring during the afternoon, corresponding most likely to primary organic aerosols and BC, respectively. Both HGFs and VGFs measured are strongly size-dependent. HGFs increase with increasing particle size, indicating that the largest particles are more hygroscopic. VGFs decrease with increasing particle size, indicating that larger particles are more volatile. The hygroscopicity distributions of smaller particles (46 and 81nm) are unimodal, with a HGF value close to unity. Large particles typically exhibit a bi-modal distribution, with a non-hygroscopic mode and a hygroscopic mode. For all particle sizes, the VGF distributions are bimodal, with a primary non-volatile mode and a secondary volatile mode. The average extinction, scattering, and absorption coefficients are 86.04, 63.07, and 22.97Mm-1, respectively, and the average SSA is 0.75. Our results reveal that gasoline and diesel vehicles produce a significant amount of black carbon particles in this US-Mexico border region, which impacts the regional environment and climate. © 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81021
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, Center for Atmospheric Chemistry and Environment, Texas A and M University, College Station, TX 77843, United States; Department of Chemistry, Center for Atmospheric Chemistry and Environment, Texas A and M University, College Station, TX 77843, United States; School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; Institute of Tropical and Marine Meteorology, CMA, Guangdong 510080, China; Molina Center for Energy and the Environment, La Jolla, CA 92037, United States; Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0221, United States; EPFL ENAC IIE APRL, GR C1 537 (Bâtiment GR), Station 2, CH-1015 Lausanne, Switzerland; Institute of Earth Environment, Chinese Academy of Sciences, No 10 Fenghui South Road, Xi'an High-Tech Zone, 710075 Xi'an, China
Recommended Citation:
Levy M,E,, Zhang R,et al. Measurements of submicron aerosols at the California-Mexico border during the Cal-Mex 2010 field campaign[J]. Atmospheric Environment,2014-01-01,88