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Analysis of Long-Range Transport Effects on PM2.5 during a Short Severe Haze in Beijing, China

Category: Air Pollution Modeling

Volume: 17 | Issue: 6 | Pages: 1610-1622
DOI: 10.4209/aaqr.2016.06.0220
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Weilin Yang, Guochen Wang, Chunjuan Bi

  • School of Geographical Sciences, Key Laboratory of Geographical Information Science of Ministry of Education, East China Normal University, Shanghai 200241, China

Highlights

The concentration of PM2.5 decreased from south to north of Beijing.
Calm and steady meteorological condition was the major influence of PM2.5 concentration.
The air flows at 500 m had the greatest contribution of the air pollution.
The potential sources were the built-up areas in Jing-Jin-Ji zone.


Abstract

Comprehensively using Inverse Distance Weighted (IDW) analysis, Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model, three-dimensional (3D) cluster analysis, Weight Potential Source Concentration Function (WPSCF) analysis and other statistic methods, we mainly studied about the spatio-temporal variation, long-range transport and potential source regions of PM2.5 in Beijing during a short severe haze from Dec05 to Dec11, 2015. The results showed that the concentration of PM2.5 decreased from south to north of Beijing. PM2.5 accumulation in the short-severe haze had high correlation with calm and steady meteorological condition (high relative humidity (RH), low wind speed (WS), low boundary-layer temperature (BLT) and surface air pressure (SAP)). In addition, air-flow in different heights (500 m, 1500 m and 3000 m) had different effects on the haze episode and the air flows at 500 m had the greatest contribution of the air pollution. The potential sources were mainly from the desert in northwest of Beijing and the built-up areas in Jing-Jin-Ji zone. Higher WPSCF values (> 0.7) were mainly distributed in Hebei, west Shandong province (around 0.5) and south Tianjin (around 0.5).

Keywords

PM2.5 Spatio-temporal distribution Meteorological parameters HYSPLIT Potential sources


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