Multi-scale evolutions of atmospheric NR-PM1 characteristics and its influencing mechanisms
TIAN Jian, HAN Li-hui, LAN Tong, QI Chao-nan, XIAO Qian, WANG Hai-yan
Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental Sciences and Technology, Beijing University of Technology, Beijing 100124, China
Abstract：An Aerodyne Aerosol Chemical Speciation Monitor (ACSM) was deployed to in situ measure the concentrations ofnon-refractory submicron particulate NR-PM1 and its species as organics Org, sulfate SO42-, nitrate NO3-, ammonium NH4+ andchloride Cl- at the southeast urban area in Beijing from December 2021 to November 2022, and further investigate the changecharacteristics of NR-PM1 and its species at different time scales, especially during the different pollution periods, and the importantfactors affecting the formation of secondary sulfate and nitrate. Meanwhile, the positive matrix factorization PMF and backwardtrajectory clustering analysis were used to study the change characteristics of organic aerosol OA components in the different periods,and the influence mechanism of air mass long-distance transport on NR-PM1 and its species in the different periods, respectively. Theresults showed that the annual average mass concentration of NR-PM1 during the study period was (7.60±10.35) μg/m3, being lowerthan the corresponding annual average since 2016, and showed a decline trend year by year. The average concentrations of NR-PM1 in different seasons showed an obvious seasonal variation characterized by autumn > spring > winter > summer, and the diurnalvariations in different seasons followed the order of night > day. The average annual mass concentration of NR-PM1 species showedan order of Org> NO3-> NH4+~ SO42-> Cl-, among which Org contributed the largest fraction of NR-PM1 with about 41.16%,followed by nitrate 33.05%, ammonium 12.47%, sulfate 11.99%, and chloride contributing the lowest fraction with 1.33%. Thediurnal variations of NR-PM1 concentrations in different seasons were all smaller, and the average concentrations of NR-PM1 and itsspecies in haze days were higher than those in ozone pollution days and clean days. The presence of alkaline NH3 in the atmosphereand the meteorological conditions during the haze days were more favorable for the secondary transformation of gaseous precursors.The OA components were different in different seasons. SOA in winter, spring and autumn is the main component of OA,while POA in summer is the main component of OA. OA in haze and ozone-polluted days was mainly affected by secondary organicmatter. The transport pathways of air mass were different in different seasons. It is noted that the haze pollution days were mainlyaffected by the short-distance transports of air mass from the southeast direction and the south direction, and NO3- showed a greatercontribution to NR-PM1. O3-polluted days were mainly affected by short-distance transports of air mass from the south direction,while clean days were mainly affected by long-distance transports of air mass from the northwest direction.
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