RT info:eu-repo/semantics/article
T1 The role of snow in scavenging aerosol particles: A physical-chemical characterization
A1 Blanco Alegre, Carlos del
A1 Calvo Gordaliza, Ana Isabel
A1 Castro Izquierdo, Amaya
A1 Oduber Pérez, Fernanda Isabel
A1 Alonso-Blanco, E.
A1 Alves, Célia dos Anjos
A1 Cerqueira, M.
A1 López González, Roberto
A1 Lucarelli, F.
A1 Nava, S.
A1 Calzolai, G.
A1 Fraile Laiz, Roberto
A2 Fisica Aplicada
K1 Física
K1 Química
K1 Aerosol size distributions
K1 Below cloud scavenging
K1 Disdrometer
K1 Scavenging coefficient
K1 Snowflakes
AB [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.
PB Elsevier
SN 0048-9697
LK https://hdl.handle.net/10612/17302
UL https://hdl.handle.net/10612/17302
NO 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
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 19-may-2024