Опубликована: Янв. 1, 2023

Secondary organic aerosol (SOA) exerts a considerable influence on atmospheric chemistry. However, little information about the vertical distribution of SOA in alpine setting is available, which limited simulation using chemical transport models. Here, total 15 biogenic and anthropogenic tracers were measured PM2.5 aerosols at both summit (1840 m a.s.l.) foot (480 Mt. Huang during winter 2020 to explore their formation mechanism. Most determined species (e.g., BSOA ASOA tracers, carbonaceous components, major inorganic ions) gaseous pollutants presented higher concentrations than those summit, suggesting relatively more significant effect emissions ground level. The ISORROPIA-II model showed that acidity increases as altitude decreases. Air mass trajectories, potential source contribution function (PSCF), correlation analysis with temperature revealed was mostly derived from local oxidation volatile compounds (VOCs), while mainly influenced by long-distance transport. robust correlations NH3, NO2, SO2) indicated could promote productions mountainous background atmosphere. Moreover, most correlated well levoglucosan all samples, biomass burning played an important role mountain troposphere. This work demonstrated daytime significantly valley breeze winter. Our results provide new insights into distributions provenance free troposphere over East China.

Язык: Английский