Morphology and mixing state of aged soot particles at a remote marine free troposphere site: Implications for optical properties

China, Swarup; Scarnato, B.; Owen, R. C.; Zhang, Bo; Ampadu, M. T.; Kumar, Sumit; Džepina, K.; Dziobak, M. P.; Fialho, Paulo; Perlinger, Judith A.; Hueber, Jacques; Helmig, Detlev; Mazzoleni, Lynn; Mazzoleni, Cláudio

doi:10.1002/2014gl062404

Cited by 178 publications

(201 citation statements)

References 58 publications

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“…Conversely, the BC from the main islands of Japan was relatively fresh (or "uncoated"), thereby maintaining its larger surface area. For example, China et al (2015) clearly showed the morphology of soot particles that are thinly and heavily coated [42], and Moffet et al (2016) reported that all soot particles in urban air were associated with organic carbon, and that soot was frequently at the center of particles as inclusions with thin or thick organic coatings [45]. Apparently this coating would cause the reduction of the surface area of soot particles.…”

Section: Monthly Correlations Between Aerosol Surface Area and Bc Conmentioning

confidence: 99%

“…From our results, therefore, we can conclude that the BC from the Asian continent did not have a large surface area but had a high mass concentration, whereas, the mass concentrations of BC transported by easterly wind was low, but that BC had a larger surface area. A possible explanation for this is that some chemical compounds were adsorbed by (or "coated") the surface of the BC during its long-range transport [42][43][44][45], thereby reducing its surface area. Conversely, the BC from the main islands of Japan was relatively fresh (or "uncoated"), thereby maintaining its larger surface area.…”

Section: Monthly Correlations Between Aerosol Surface Area and Bc Conmentioning

confidence: 99%

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Monthly and Diurnal Variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, Measured by Diffusion Charging Method

et al. 2017

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Observation of the ambient aerosol surface area concentrations is important to understand the aerosol toxicity because an increased surface area may be able to act as an enhanced reaction interface for certain reactions between aerosol particles and biological cells, as well as an extended surface for adsorbing and carrying co-pollutants that are originally in gas phase. In this study, the concentration of aerosol surface area was measured from April 2015 to March 2016 in Fukuoka, Japan. We investigated the monthly and diurnal variations in the correlations between the aerosol surface area and black carbon (BC) and sulfate concentrations. Throughout the year, aerosol surface area concentration was strongly correlated with the concentrations of BC, which has a relatively large surface area since BC particles are usually submicron agglomerates consisting of much smaller (tens of nanometers) sized primary soot particles. The slopes of the regression between the aerosol surface area and BC concentrations was highest in August and September 2015. We presented evidence that this was caused by an increase in the proportion of airmasses that originated on the main islands of Japan. This may enhance the introduction of the BC to Fukuoka from the main islands of Japan which we hypothesize to be relatively fresh or "uncoated", thereby maintaining its larger surface area.

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Section: Monthly Correlations Between Aerosol Surface Area and Bc Conmentioning

confidence: 99%

Section: Monthly Correlations Between Aerosol Surface Area and Bc Conmentioning

confidence: 99%

Monthly and Diurnal Variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, Measured by Diffusion Charging Method

et al. 2017

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“…High magnification TEM images demonstrate that typical soot spheres display the onion-like structures with disordered graphitic layers as shown in Figure 1g. They are from incomplete combustion of fossil fuels and other materials [23]. TEM images of primary individual particles: (a,b) mineral particles, (c) spherical organic particle, (d) near-spherical organic particle, (e) aged soot particle and (f) chain-like soot particle; (g) amplified soot spherical.…”

Section: Nature Of Individual Aerosol Particlesmentioning

confidence: 99%

Section: Nature Of Individual Aerosol Particlesmentioning

confidence: 99%

Physicochemical Characteristics of Individual Aerosol Particles during the 2015 China Victory Day Parade in Beijing

et al. 2018

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During the 2015 China Victory Day parade control periods, the air quality in Beijing hit the best record, leading to 15 continuous good days with an average PM 2.5 mass concentration 18 µg/m 3 , which provided a unique opportunity to study the ambient aerosols in megacity Beijing. The morphology and elemental composition of aerosol particles were investigated by transmission electron microscopy coupled with energy dispersive X-ray spectrometry (TEM-EDX). Five types of individual particles were identified, including homogeneous mixed S-rich particles (HS; 44.9%), organic coated S-rich particles (CS; 34.3%), mineral particles (10.5%), soot aggregates (7.21%) and organic particles (3.2%). The number percentage of secondary particles (including HS and CS) accounted for a large proportion with 79.2% during the control periods. The average diameter of secondary particles increased with relative humidity (RH), being 323 nm, 358 nm and 397 nm at the RH 34%, 43% and 53%, respectively, suggesting that the high RH might favor the growth of secondary particles. The higher proportion of CS particles may show great atmospheric implications and the CS particles may be formed by the condensation of secondary organic aerosols on pre-existing S-rich particles.

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“…Recent studies show that internal mixing of BC with other aerosol materials in the atmosphere can alter its aggregate shape (Zhang et al, 2008;Xue et al, 2009;Cross et al, 2010;China et al, 2013), absorption of solar radiation (Bueno et al, 2011;Cappa et al, 2012b), and radiative forcing (Adachi et al, 2010;Kahnert et al, 2012). China et al (2014), furthermore, characterized the predominant mixing and morphology types observed with the electron microscopes from samples collected in different locations and for different sources (i.e., biomass burning aerosol and vehicle exhaust) by classifying BC into four main classes (bare BC, inclusions, thinly coated and embedded BC); similar classes where identified by Scarnato et al (2013) for laboratory-generated mixtures of BC and sodium chloride (an aerosol mixture resembling dirty marine aerosol).…”

Section: B V Scarnato Et Al: Optical Properties Internally Mixed Mmentioning

confidence: 99%

Perturbations of the optical properties of mineral dust particles by mixing with black carbon: a numerical simulation study

et al. 2015

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Abstract. Field observations show that individual aerosol particles are a complex mixture of a wide variety of species, reflecting different sources and physico-chemical transformations. The impacts of individual aerosol morphology and mixing characteristics on the Earth system are not yet fully understood. Here we present a sensitivity study on climaterelevant aerosols optical properties to various approximations. Based on aerosol samples collected in various geographical locations, we have observationally constrained size, morphology and mixing, and accordingly simulated, using the discrete dipole approximation model (DDSCAT), optical properties of three aerosols types: (1) bare black carbon (BC) aggregates, (2) bare mineral dust, and (3) an internal mixture of a BC aggregate laying on top of a mineral dust particle, also referred to as polluted dust.DDSCAT predicts optical properties and their spectral dependence consistently with observations for all the studied cases. Predicted values of mass absorption, scattering and extinction coefficients (MAC, MSC, MEC) for bare BC show a weak dependence on the BC aggregate size, while the asymmetry parameter (g) shows the opposite behavior. The simulated optical properties of bare mineral dust present a large variability depending on the modeled dust shape, confirming the limited range of applicability of spheroids over different types and size of mineral dust aerosols, in agreement with previous modeling studies. The polluted dust cases show a strong decrease in MAC values with the increase in dust particle size (for the same BC size) and an increase of the single scattering albedo (SSA). Furthermore, particles with a radius between 180 and 300 nm are characterized by a decrease in SSA values compared to bare dust, in agreement with field observations. This paper demonstrates that observationally constrained DDSCAT simulations allow one to better understand the variability of the measured aerosol optical properties in ambient air and to define benchmark biases due to different approximations in aerosol parametrization.

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Morphology and mixing state of aged soot particles at a remote marine free troposphere site: Implications for optical properties

Cited by 178 publications

References 58 publications

Monthly and Diurnal Variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, Measured by Diffusion Charging Method

Monthly and Diurnal Variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, Measured by Diffusion Charging Method

Physicochemical Characteristics of Individual Aerosol Particles during the 2015 China Victory Day Parade in Beijing

Perturbations of the optical properties of mineral dust particles by mixing with black carbon: a numerical simulation study

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