Analysis of the atmospheric pollution transport pathways and sources in Shenyang, based on the HYSPLIT model

Abstract

The transport pathways and potential sources distribution of air pollutants are statistically analyzed based on the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model and the TrajStat method driven by the meteorological data of the Global Data Assimilation System (GDAS), and the concentration monitoring data of PM10, PM2.5, SO2 and NO2 in Shenyang, Liaoning Province in 2017. The trajectory classification method is used to analyze the main transport pathways affecting air masses during the research period. It is considered that the air masses in the northeast and northwest directions are the main reason for the high concentration of pollutants in the study area, while the air masses in the south direction are considered to be clean. Furthermore, the results of PSCF (potential resource contribution function) are consistent with the results of CWT (concentration-weighted trajectory). The potential sources that result in high concentrations of PM10 and PM2.5 are mainly located in southern Hebei Province, northern Shandong Province and the central and eastern Inner Mongolia Autonomous Regions. The corresponding potential source area shows a concentration of PM10 exceeding 150 μg•m-3 and PM2.5 exceeding 75 μg•m-3, while the source of nitrogen sulfide is mainly influenced by local sources.