Aerosol size distribution transformation in fog

Ulevičius, Vidmantas; Trakumas, Saulius; Girgždys, Aloyzas

doi:10.1016/1352-2310(94)90238-0

Cited by 12 publications

(11 citation statements)

References 10 publications

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“…Both larger droplet size and higher f t lead to higher aqueous sulfate production rate, and possibly result in increased particle diameter growth rate as increasing diameter, as shown by growth law analysis. Similar particle growth law showing combination of condensational growth and volume controlled reactions have been observed in previous field studies McMurry and Wilson, 1982] including a study of aerosol growth during a winter fog event [Ulevicius et al, 1994].…”

Section: Case I Of Growth Law Analysis 16 May 2003supporting

confidence: 84%

Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis

et al. 2006

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[1] Aerosol size distributions were measured by a Scanning Mobility Particle Sizer (SMPS) on board the CIRPAS Twin Otter aircraft during 16 flights at the Southern Great Plains (SGP) site in northern central Oklahoma as part of the Aerosol Intensive Operation period in May 2003. During the same period a second SMPS was deployed at a surface station and provided continuous measurements. Combined with trace gas measurements at the SGP site and back trajectory analysis, the aerosol size distributions provided insights into the sources of aerosols observed at the SGP site. High particle concentrations, observed mostly during daytime, were well correlated with the sulfur dioxide (SO 2 ) mixing ratios, suggesting nucleation involving sulfuric acid is likely the main source of newly formed particles at the SGP. Aerosols within plumes originating from wildfires in Central America were measured at the surface site. Vertically compact aerosol layers, which can be traced back to forest fires in East Asia, were intercepted at altitudes over 3000 m. Analyses of size-dependent particle growth rates for four periods during which high cloud coverage was observed indicate growth dominated by volume controlled reactions. Sulfate accounts for 50% to 72% of the increase in aerosol volume concentration; the rest of the volume concentration increase was likely due to secondary organic species. The growth law analyses and meteorological conditions indicate that the sulfate was produced mainly through aqueous oxidation of SO 2 in clouds droplets and hydrated aerosol particles.

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Section: Case I Of Growth Law Analysis 16 May 2003supporting

confidence: 84%

Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis

et al. 2006

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“…Our measurements of fine particles can be explained using the results of Ulevicius et al (1994) which show that diameter growth rate increases with increasing particle diameter for large particles of accumulation mode (D > 0.1 µm) but decreases with increasing particle diameter for smaller particles. They conclude that formation and growth of small particles is dominated by the growth resulting from condensation of low vapour pressure species by gas-phase reactions while growth of large particles (> 0.1 µm) is consistent with growth by droplet-phase (heterogeneous) chemical reactions.…”

Section: Discussionmentioning

confidence: 99%

“…Occurrence of fog significantly changes the characteristics of aerosols through several physical and chemical processes involving nucleation of water vapour on particles, the Brownian diffusion and coagulation of aerosols, interaction of aerosols and fog, efficiency of heterogeneous reactions, scavenging of aerosols by fog droplets during their sedimentation to the ground, etc., (e.g., Ulevicius et al 1994;Sasakawa and Uematsu 2002;Sasakawa et al 2003;Moore et al 2004). Although, chemical properties of sea fog are rarely reported, size distribution measurements of the aerosol and fog particles can reveal about several aspects of the chemical properties and the physical and chemical processes involved in such events.…”

Section: Introductionmentioning

confidence: 99%

Changes in concentration and size distribution of aerosols during fog over the south Indian Ocean

2010

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Measurements of the concentration and size distribution of aerosol particles in the size-ranges of 0.5-20 µm and 16-700 nm diameters were made during six fog episodes over the south Indian Ocean. Observations show that concentrations of particles of all sizes start decreasing 1-2 hours before the occurrence of fog. This decrease is more prominent for coarse particles of > 1 µm diameter and continues until 10-20 minutes before the onset of fog when particle concentrations in all size ranges rapidly increase by one/two orders of magnitude in ∼ 20 minutes. Thereafter, concentrations of particles of all sizes gradually decrease until the dissipation of fog. After the fog dissipation, concentrations of coarse mode particles rapidly increase and restore to their pre-fog levels but concentrations of the Aitken mode particles decrease slowly and reach their pre-fog levels only after 1-2 hours. The net effect of fog is to change the bimodal size distributions of aerosols with a coarse mode at 1.0 µm and an accumulation mode at 40-60 nm to a power law size distribution. It is proposed that the preferential growth and sedimentation of the coarse mode hygroscopic particles in the initial phase cause a large decrease in the aerosol surface area. As a result, the low vapour pressure gases which were initially being used for the growth of coarse mode particles, now accelerate the growth rates of the accumulation and Aitken mode particles.

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“…Aerosol effects such as Brownian diffusion, collision, agglomeration, and deposition during the process of relative humidity change will result in spectrum distribution changes of atmospheric aerosol particles [18]. A particle monitor (model: Grimm 180) was used to obtain aerosol particle concentrations at different aerosol sizes.…”

Section: Distribution Characteristics Of Aerosol Particle Spectrummentioning

confidence: 99%

Particulate Characteristics during a Haze Episode Based on Two Ceilometers with Different Wavelengths

Yuan

Huang

et al. 2016

Atmosphere

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Abstract:To investigate the particulate characteristics of a haze episode, data from two ceilometers with wavelengths of 532 nm and 910 nm, respectively, were studied intensively. By combining the data from the ceilometers with data from a sounding balloon, an automatic meteorological station, and a Grimm 180 PM instrument, analyses of the haze process of a short haze event were performed. The results showed that the relatively calm weather conditions were favorable to the occurrence of the haze and that higher relative humidity had a great influence on visibility. The extinction profiles from the ceilometers reflected the existence of an inverted structure of the temperature profiles and demonstrated the extinction differences at two different wavelengths. Because extinction has a positive correlation with relative humidity, the effect of hygroscopic growth was analyzed at the two different wavelengths. As hygroscopic growth of the particles proceeded, the longer wavelength became more sensitive to the large particles, and vice versa. The hygroscopic growth factor and the Angstrom exponent showed a negative correlation, and the correlation coefficients at 532 nm and 910 nm were 0.54 and 0.86, respectively. The accumulation mode particles were more stable through time than the coarse mode particles, and the variation of the coarse mode particles coincided well with the variation of the Angstrom exponent from the two ceilometers.

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Aerosol size distribution transformation in fog

Cited by 12 publications

References 10 publications

Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis

Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis

Changes in concentration and size distribution of aerosols during fog over the south Indian Ocean

Particulate Characteristics during a Haze Episode Based on Two Ceilometers with Different Wavelengths

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