Pollution Characteristics and Regional Transport of Atmospheric Particulate Matter in Beijing from October to November, 2016

被引：5

作者：

Zhang H.-Y. ^{[1
]}

Cheng S.-Y. ^{[1
]}

Yao S. ^{[1
]}

Wang X.-Q. ^{[1
]}

Zhang J.-F. ^{[1
]}

机构：

[1] Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 05期

关键词：

Aerosol Chemical Speciation Monitor (ACSM); Chemical components; Meteorology-air quality coupling model system (WRF-CAMx); Non-refractory submicron aerosols (NR-PM[!sub]1[!/sub]); PM[!sub]2.5[!/sub] transport flux; Potential source contribution function (PSCF) method;

D O I：

10.13227/j.hjkx.201810228

中图分类号：

学科分类号：

摘要：

In this study, the Aerosol Chemical Speciation Monitor (ACSM) was used to conduct real-time and continuous comprehensive observation of chemical components in non-refractory submicron aerosols (NR-PM1) from October 15 to November 15, 2016. In addition to that, the evolution characteristics of NR-PM1 chemical components were discussed. The potential source contribution function (PSCF) method and a meteorology-air quality coupling model system (WRF-CAMx) were applied to identify the potential PM2.5 emission sources and transport path in Beijing, and the vertical distribution characteristics of PM2.5 net transport flux. The results indicate that the monthly average mass concentrations of NR-PM1 and PM2.5 were (59.16±57.05) μg•m-3 and (89.82±66.66) μg•m-3, respectively. On average, NR-PM1 accounted for (70.31±22.28)% of PM2.5. During the whole study period, Org, NO3-, SO42-, NH4+, and Chl represented (42.75±11.35)%, (21.27±7.72)%, (19.11±7.08)%, (12.19±2.64)%, and (4.68±3.24)% of NR-PM1, respectively. The diurnal variation characteristics of different chemical components were disparate. The high potential source areas were mainly located in southern Hebei, northeastern Henan, and western Shandong provinces during the whole study period. During the haze episode, the potential regions of higher contribution were concentrated in Baoding, southern Beijing, and Langfang. The simulation results of WRF-CAMx showed that the vertical distribution characteristics of PM2.5 net flux varied with different altitudes. The adjacent cities mainly export PM2.5 to Beijing, and the PM2.5 net fluxes mainly occurred at 600-800 m during the whole study period. PM2.5 in Beijing from external sources mainly occurred in high altitudes during the early stage of the heavy pollution episode. Then it turned to near-ground transport until November 5, when the pollution was the most severe. This indicated that high-altitude and near-ground transport both played an essential role in the formation of heavy PM2.5 pollution in Beijing during the autumn. Moreover, two important transport pathways were identified: the southwest-northeast pathway (Baoding→ Beijing→ Chengde) and the northwest-southeast pathway (Zhangjiakou→ Beijing→ Langfang-south→ Tianjin). © 2019, Science Press. All right reserved.

引用

页码：1999 / 2009

页数：10

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