Impact of Vehicle Soot Agglomerates on Snow Albedo

Atmosphere

Francisco Cereceda-Balic¹  Ximena Fadic-Ruiz¹  Raúl P. Flores²  Diego Pacheco-Ferrada²  Lina Castro²  Magín Lapuerta³  Rosario Ballesteros³  Diego Gómez-Doménech³  Sofía González-Correa³ 

[1] Centre for Environmental Technologies (CETAM) and Department of Chemistry, Universidad Técnica Federico Santa María, Avenue España 1680, Valparaíso 2390123, Chile;Departamento de Obras Civiles, Universidad Técnica Federico Santa María, Avenue España 1680, Valparaíso 2390123, Chile;Escuela Técnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;

关键词: snow albedo;    black carbon;    radiative transfer modelling;    vehicle emissions;   

DOI  :  10.3390/atmos13050801

来源: DOAJ

【 摘 要 】

Snow covers are very sensitive to contamination from soot agglomerates derived from vehicles. A spectroradiometric system covering a wavelength from 300 to 2500 nm with variable resolution (from 2.2 to 7.0 nm) was used to characterize the effect of soot derived from a diesel vehicle whose exhaust stream was oriented towards a limited snowed area. The vehicle was previously tested in a rolling test bench where particle number emissions and size distributions were measured, and fractal analysis of particle microscopic images was made after collecting individual agglomerates by means of an electrostatizing sampler. Finally, the experimental results were compared to modelled results of contaminated snow spectral albedo obtained with a snow radiative transfer model developed by our research group (OptiPar) and with other models. Both experimental and modelled results show that increasingly accumulated soot mass reduces the snow albedo with a constant rate of around 0.03 units per mg/kg, with a predominant effect on the UV-VIS range. Based on the small size of the primary particles (around 25 nm), the Rayleigh-Debye-Gans approximation, further corrected to account for the effect of multiple scattering within the agglomerates, was revealed as an appropriate technique in the model.

【 授权许可】

Unknown