Aerosol size distribution in precipitation events in León, Spain

Castro, Amaya; Alonso‐Blanco, Elisabeth; González-Colino, Miguel; Calvo, Ana; Fernández‐Raga, María; Fraile, Roberto

doi:10.1016/j.atmosres.2010.01.014

Cited by 49 publications

(24 citation statements)

References 24 publications

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“…From the results of Castro et al (2010), the detected number of particles decreased 20%, and large-and small-sized particles also decreased all together during rain events with intensities of over 3.2 ±1.5 mm/h. However, correlations between the probabilities of NO 2 concentration reduction and amount of rainfall was not observed, as the probability of NO 2 concentration reduction decreased from 56.8% in group 2 to 53.9% in group 6.…”

Section: Reduction Probabilities Of Pm 10 and Nomentioning

confidence: 99%

“…When the amount of precipitation is less than 1 mm, alternatively, an increase of PM 10 concentration in the atmosphere may be observed, because the effect of traffic and other emissions can be higher than the washout effect of the rain. Castro et al (2010) also reported that if the rain intensity is about 0.6 mm/h or lower, the result may be a considerable increase in the number of aerosols measuredup to 89% more -with an increase in the number of particles smaller than 1.3 μm and a decrease in the number of particles larger than 1.3 μm.…”

Section: Reduction Probabilities Of Pm 10 and Nomentioning

confidence: 99%

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Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Kim¹,

Hong²,

Jun³

et al. 2014

Asian J. Atmos. Environ

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In this study, long-term rainfall data with irregular spatial distribution in Seoul, Korea, were separated into individual precipitation events by the inter-event time definition of 6 hours. Precipitation washout of PM 10 and NO 2 concentrations in the air considering various complex factors were analyzed quantitatively. Concentrations of PM 10 and NO 2 in the atmosphere were lower under condition of rainfall compared to that of non-precipitation, and a noticeable difference in average PM 10 concentrations was observed. The reduction of concentrations of PM 10 and NO 2 by rainfall monitored at road-side air monitoring sites was also lower than that of urban air monitoring sites due to continuous pollutant emissions by transportation sources. Meanwhile, a relatively smaller reduction of average PM 10 concentration in the atmosphere was observed under conditions of light rainfall below 1 mm, presumably because the impact of pollutant emission was higher than that of precipitation scavenging effect, whereas an obvious reduction of pollutants was shown under conditions of rainfall greater than 1 mm. A log-shaped regression equation was most suitable for the expression of pollutant reduction by precipitation amount. In urban areas, a lower correlation between precipitation and reduction of NO 2 concentration was also observed due to the mobile emission effect.

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Section: Reduction Probabilities Of Pm 10 and Nomentioning

confidence: 99%

Section: Reduction Probabilities Of Pm 10 and Nomentioning

confidence: 99%

Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Kim¹,

Hong²,

Jun³

et al. 2014

Asian J. Atmos. Environ

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“…Portable stations are used for registration of weather conditions in tests on the effect of rainfall on aerosanitary conditions [35]. This weather station was installed 12 m from the PM aspirator.…”

Section: Meteorological Parameters and Pm 10 Sampling Proceduresmentioning

confidence: 99%

Concentration Changes Of PM₁₀ Under Liquid Precipitation Conditions

Olszowski

2015

Ecological Chemistry and Engineering S

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This study reports the results of field research into variability of the scavenging coefficient (Λ) of suspended dust comprising particles with aerodynamic diameters less than 10 mm. Registration of PM10 over 7 years in conditions of the occurrence of rainfall (convective light showers, large-scale precipitation and storms) was undertaken in an undeveloped rural area. The analysis involved 806 observations taken at constant time intervals of 0.5 hour. The measurements of the concentration of PM10 were performed by means of a reference method accompanied by concurrent registration of basic meteorological parameters. It was found that, for PM10, the scavenging efficiency is considerably influenced by rainfall intensity R and the type of precipitation. In the case of convective precipitation, data on Λ are only partially related to "classical approach" of rain scavenging. Within the range of comparable values of rainfall intensity, the type of wet deposition (except for storms) does not influence the effectiveness of scavenging PM10 from the ground-level zone. The large number of observations conducted in real-time conditions yielded a proposal of simple regression model, which can be deemed suitable for the description of variability Λ (DPM10), but only to a limited extent for large-scale precipitation. The collected results can be applied in air pollution dispersion models and deposition and were found to be generally representative for areas with similar climatic characteristics.

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“…With a confidence level of 95%, the precipitation is significantly negatively correlated with particle concentrations in the size ranges of 30-110 nm and 110-661 nm. As Castro [37] pointed out previously, the washout of soluble particles would be fast and noticeable when the precipitation intensity exceeds 3.2 mm¨h´1. Considering that the concentration of particles smaller than 30 nm does not present significant correlation with precipitation, the washout effect may mainly act on large particles.…”

Section: Monthly Variabilitymentioning

confidence: 90%

Characteristics of Ultrafine Particles and Their Relationships with Meteorological Factors and Trace Gases in Wuhan, Central China

et al. 2016

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Ultrafine particles with a diameter below 1 µm are strongly linked to traffic and industrial emissions, causing a growing global health concern. In order to reveal the characteristics of ultrafine particles in central China, which makes up the sparse research in industrial cities of a developing country, particle number concentrations (PNC) together with meteorological parameters and concentrations of trace gases were measured over one year in Wuhan. The number concentration of ultrafine particles peaked in winter and was the lowest in summer across the entire size range monitored. Further, particles with a diameter smaller than 30 nm increased dramatically in concentration with decreasing diameter. The monthly averaged number concentrations of particles discriminated in three size ranges formed a near-inverse parabolic distribution peaking in January. This trend is supported by a negative correlation between PNC and precipitation, temperature, and mixing layer height, which emphasizes the effect of these meteorological parameters on scouring, convection, and diffusion of particles. However, since wind not only disperses particulate matter but also brings in exogenous particles, wind speed plays an equivocal role in particle number concentrations. The diurnal analysis indicates that hourly measurements of trace gases concentrations could be used as a proxy for dense industrial activities and to reveal some complex chemical reactions. The results of this study offer reasonable estimations of particle impacts and provide references for policymaking of emission control in the industrial cities of developing countries.

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Aerosol size distribution in precipitation events in León, Spain

Cited by 49 publications

References 24 publications

Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Concentration Changes Of PM₁₀ Under Liquid Precipitation Conditions

Characteristics of Ultrafine Particles and Their Relationships with Meteorological Factors and Trace Gases in Wuhan, Central China

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Aerosol size distribution in precipitation events in León, Spain

Cited by 49 publications

References 24 publications

Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Concentration Changes Of PM10 Under Liquid Precipitation Conditions

Characteristics of Ultrafine Particles and Their Relationships with Meteorological Factors and Trace Gases in Wuhan, Central China

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Concentration Changes Of PM₁₀ Under Liquid Precipitation Conditions