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Título
The role of snow in scavenging aerosol particles: A physical-chemical characterization
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Science of The Total Environment
Cita Bibliográfica
Blanco-Alegre, C., Calvo, A. I., Castro, A., Oduber, F., Alonso-Blanco, E., Alves, C., Cerqueira, M., López, R., Lucarelli, F., Nava, S., Calzolai, G., & Fraile, R. (2024). The role of snow in scavenging aerosol particles: A physical-chemical characterization. The Science of the Total Environment, 906(167608), 167608. https://doi.org/10.1016/j.scitotenv.2023.167608
Editorial
Elsevier
Fecha
2024
ISSN
0048-9697
Resumen
[EN] The below cloud scavenging of aerosols by snow has been analysed in León (NW Spain). Six snow events were registered over the course of one year of study. Ultrafine and accumulation aerosol particles were measured using a scanning mobility particle sizer spectrometer, while hydrometeors were characterized using a disdrometer. Furthermore, the chemical composition of the melted snow-water samples (soluble and insoluble fractions) was analysed.
The scavenging coefficient (λ) showed a great variability among events. An effective washing of particles was observed during the first 30 min of snowfall. The mean change in the scavenging efficiency (%ΔC) of particle number concentration (PNC) and λ coefficient during this time interval were: i) nucleation mode: 36.3 % and 3.02 · 10−4 s−1; ii) Aitken mode: 30.4 % and 2.37 · 10−4 s−1 and iii) accumulation mode: 22.4 % and 1.77 · 10−4 s−1. The range of particle sizes that is less efficiently scavenged by snowfall was observed between 400 and 600 nm. When analyzing the whole snow event, an increase of PNC was observed. Two possible explanations underlie this behaviour: it could be caused by changes in air masses or by the resuspension of aerosol particles scavenged by snowflakes upon reaching the ground. A clear relationship was observed between Ca2+, SO42− and NO3− concentrations of aerosol particles before the snow event and the concentrations registered in the melted snow-water.
The largest and smallest changes in aerosol number concentrations were caused by snowflakes of 3 and 6 mm in diameter, respectively. The particle size distributions (PSD) were fitted to log-normal distributions and the parameters were compared before and after snowfall.
Materia
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ID proyecto
- info:eu-repo/grantAgreement/MINECO/Programa Estatal de I+D+I Orientada a los Retos de la Sociedad/CGL2014-52556-R/ES/INFLUENCIA DE LA PRECIPITACION EN LA CONCENTRACION DE MATERIAL PARTICULADO Y DE POLEN: CONSECUENCIAS CLIMATICAS Y CLINICAS
- info:eu-repo/grantAgreement/AEI/Programa Estatal de Generación de Conocimiento y Fortalecimiento Científico y Tecnológico del Sistema de I+D+i/PID2019-106164RB-I00/ES/RELACION ENTRE EL BIOAEROSOL Y OTROS CONTAMINANTES: EFECTOS SOBRE LAS RESPUESTAS ALERGICAS EN DIFERENTES ESCENARIOS ATMOSFERICOS
- info:eu-repo/grantAgreement/AEI/Programa Estatal de I+D+i Orientada a los Retos de la Sociedad/RTI2018-05G98189-B-I00/ES/MODELADO DEL CANAL DE ONDAS MILIMETRICAS Y PLANIFICACION RADIO ORIENTADOS A REDES 5G
- info:eu-repo/grantAgreement/Junta de Castilla y León/LE025P20/ES/CONTAMINACIÓN ATMOSFÉRICA POR CARBONO NEGRO PROCEDENTE DE LA COMBUSTIÓN DEL CARBÓN: USO DEL ETALÓMETRO PARA ESTIMAR SU CONTRIBUCIÓN Y CUANTIFICAR EL LAVADO POR LA LLUVIA.
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