Journal ArticleDOI
Effects of meteorological conditions on aerosol composition and mixing state in Bakersfield, CA.
TLDR
Single particle data show that carbonaceous aerosol with secondary ammonium, nitrate, and sulfate dominate the aerosol concentration during a stagnation period with a dramatic composition shift occurring to sodium type particles during the haze period.Abstract:
Particle and meteorological instrumentation were used to characterize ambient atmospheric conditions, aerosol size distributions, aerosol mass concentrations, and single particle size and chemical composition in Bakersfield, CA for the period January 9, 1999 through January 28, 1999. The sampling period included four distinct meteorological periods of stagnation, clearing, haze, and rain. Particle number and mass concentrations were the highest during the stagnation episode when a heavy and extensive fog developed. Mass and number concentrations also approached these high levels during the haze period. Single particle size and composition data from an aerosol time-of-flight mass spectrometer (ATOFMS) are used to provide unique continuous information on the diversity in types of particles present, the effects of meteorology on particle size and composition, and the distribution of important chemical species within individual particles. Aerosol composition and mixing state are found to vary with meteorological conditions. Single particle data show that carbonaceous aerosol with secondary ammonium, nitrate, and sulfate dominate the aerosol concentration during a stagnation period with a dramatic composition shift occurring to sodium type particles during the haze period. The aerosol is internally mixed with respect to carbon, nitrate, sulfate, and ammonium during the stagnation period. The mixing state changes significantly over the haze period when much greater diversity in the associations of chemical species within individual particles occurs.read more
Citations
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Journal ArticleDOI
Light Absorption by Carbonaceous Particles: An Investigative Review
Tami C. Bond,Robert Bergström +1 more
TL;DR: The optical properties of light-absorbing, carbonaceous substance often called "soot", "black carbon", or "carbon black" have been the subject of some debate as discussed by the authors.
Journal ArticleDOI
A review of single aerosol particle studies in the atmosphere of East Asia: morphology, mixing state, source, and heterogeneous reactions
Weijun Li,Longyi Shao,Daizhou Zhang,Chul-Un Ro,Min Hu,Xinhui Bi,Hong Geng,Atsushi Matsuki,Hongya Niu,Jianmin Chen +9 more
TL;DR: A review on physicochemical properties, mixing state, heterogeneous chemical reactivity of individual particles in East Asia based on electron microscopy and mass spectrometry is presented in this paper.
Journal ArticleDOI
Aerosol Mixing State: Measurements, Modeling, and Impacts
Nicole Riemer,Andrew P. Ault,Matthew West,Rebecca L. Craig,Rebecca L. Craig,Jeffrey H. Curtis +5 more
Journal ArticleDOI
Significant changes in the chemical compositions and sources of PM2.5 in Wuhan since the city lockdown as COVID-19.
Huang Zheng,Shaofei Kong,Nan Chen,Yingying Yan,Dantong Liu,Bo Zhu,Ke Xu,Wenxiang Cao,Qingqing Ding,Bo Lan,Zhouxiang Zhang,Mingming Zheng,Zewei Fan,Yi Cheng,Shurui Zheng,Liquan Yao,Yongqing Bai,Tianliang Zhao,Shihua Qi +18 more
TL;DR: The complex and nonlinear response of chemical compositions and sources of PM2.5 to air pollution control measures are highlighted, suggesting the importance of regional-joint control.
Journal ArticleDOI
Temporal variability of trace metal mobility of urban particulate matter from Beijing – A contribution to health impact assessments of aerosols
Nina Schleicher,Stefan Norra,Fahe Chai,Yizhen Chen,Shulan Wang,Kuang Cen,Yang Yu,Doris Stüben +7 more
TL;DR: In this paper, the total element concentration and the chemical fractionation of 18 elements (Al, As, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb, Rb, Sr, Ti, V, Zn) in total suspended particulate matter (TSP) from Beijing, China, were studied for a period of three years.
References
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Journal ArticleDOI
Real-Time Analysis of Individual Atmospheric Aerosol Particles: Design and Performance of a Portable ATOFMS
Eric E. Gard,Joseph E. Mayer,Brad D. Morrical,Tas Dienes,and David P. Fergenson,Kimberly A. Prather +5 more
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Evaluation of secondary organic aerosol formation in winter
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Journal ArticleDOI
Atmospheric Radiocarbon Calibration to 45,000 yr B.P.: Late Glacial Fluctuations and Cosmogenic Isotope Production
TL;DR: The results confirm the (recently revised) floating German pine chronology and are consistent with data from European and marine varved sediments, and combined uranium-thorium and carbon-14 dating of corals up to the Last Glacial Maximum.
Journal ArticleDOI
Real-Time Measurement of Correlated Size and Composition Profiles of Individual Atmospheric Aerosol Particles
TL;DR: In this paper, the authors used a dual-laser aerodynamic particle sizing system to size and track individual particles through the instrument and laser desorption/ionization time-of-flight mass spectrometry to obtain correlated single particle composition data.
Journal ArticleDOI
The distribution of ammonium salts among a size and composition dispersed aerosol
TL;DR: In this paper, the chemical and physical processes that govern the distribution of ammonium salt condensate over a size and composition-dispersed aerosol particle population are considered.
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