ANALYSIS OF DIFFUSION CHARACTERISTICS AND FORMATION CAUSES OF PM<sub>2.5</sub> IN SHENYANG USING WRF-CHEM

DU Bo-ying; MA Yun-feng; WANG Qi; WANG Yue; SHI Xiao-fei; WANG Shuai; BIAN Yu-shan

doi:10.13205/j.hjgc.202102014

Volume 39 Issue 2

Jul. 2021

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(2): 89-97,104

DU Bo-ying, MA Yun-feng, WANG Qi, WANG Yue, SHI Xiao-fei, WANG Shuai, BIAN Yu-shan. ANALYSIS OF DIFFUSION CHARACTERISTICS AND FORMATION CAUSES OF PM2.5 IN SHENYANG USING WRF-CHEM[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 89-97,104. doi: 10.13205/j.hjgc.202102014

Citation:

DU Bo-ying, MA Yun-feng, WANG Qi, WANG Yue, SHI Xiao-fei, WANG Shuai, BIAN Yu-shan. ANALYSIS OF DIFFUSION CHARACTERISTICS AND FORMATION CAUSES OF PM_2.5 IN SHENYANG USING WRF-CHEM[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 89-97,104. doi: 10.13205/j.hjgc.202102014

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ANALYSIS OF DIFFUSION CHARACTERISTICS AND FORMATION CAUSES OF PM_2.5 IN SHENYANG USING WRF-CHEM

doi: 10.13205/j.hjgc.202102014

1. College of Energy and Environment, Shenyang Aerospace University, Shenyang 110126, China;
2. Liaoning University of Technology, Jinzhou 121001, China;
3. Chinese Research Academy of Environmental Sciences, Beijing 100021, China;
4. China Aerospace Science & Industry Corp., Beijing 100854, China;
5. State Environmental Protection Key Laboratory of Atmospheric Organic Pollutants Monitoring and Analysis, Shenyang Environmental Monitoring Center, Shenyang 110000, China

Received Date: 2019-07-17
Available Online: 2021-07-19

Abstract

Abstract

In recent years, the quality of the atmospheric environment in many cities has become increasingly severe, which is not only related to the emission of pollutants from local sources, but also affected by regional transportation. Taking an air pollution process as an example in Shenyang, Liaoning in January 2017, the evolution process and meteorological impact were analyzed. Firstly, the WRF-HYSPLIT model was used to calculate the backward trajectories, and the WRF-Chem air quality model was used to calculate the ground surface PM_2.5 particle diffusion process. At the same time, the surface synoptic map and isobaric surface in the study area was analyzed and simulated. The results showed that the air mass trajectory pathways in January 2017 could be divided into 5 types, in which the trajectory cluster 1 in the west direction had the fastest moving speed, but the pollution value and frequency were lower. And the transport pathways numbered 2 and 3 were similar originating in the Inner Mongolia Autonomous Region and moving to the southeast direction to the target area. And these trajectories carried low PM_2.5 value of 45.47, 67.97 μg/m³, with frequency of 24.19% and 15.32%, respectively. The cluster 4 showed that the local source transports accounted for 33.03% with the largest pollution level, which was 121.66 μg/m³. The trajectory cluster 5 in the southwest transport pathway had a frequency of 14.53% and the PM_2.5 value of 105.5 μg/m³. The results of air quality model were consistent with the trajectories calculation results:the southwest and the northeast transport pathways led to a particulate matter increase in the target area. Heavy pollution events were more likely to occur due to the impact of Northeast China Topographic Trough and Changbai Mountain Small High Pressure formed by topographical dynamics and thermal factors.
- HYSPLIT,
- K-mean algorithm,
- main transport pathways,
- WRF-Chem,
- Shenyang

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References(33)

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