Synoptic Weather Patterns and Atmospheric Circulation Types of PM2.5 Pollution Periods in the Beijing-Tianjin-Hebei Region

被引:6
|
作者
Gu, Shijie [1 ]
Wu, Shuai [1 ]
Yang, Luoqi [1 ]
Hu, Yincui [1 ]
Tian, Bing [1 ]
Yu, Yan [1 ]
Ma, Ning [1 ]
Ji, Pengsong [1 ]
Zhang, Bo [1 ]
机构
[1] Hebei Normal Univ, Hebei Technol Innovat Ctr Remote Sensing Identific, Hebei Key Lab Environm Change & Ecol Construct, Sch Geog Sci,Hebei Prov Key Lab Informat Fus & Int, Shijiazhuang 050024, Peoples R China
关键词
PM2; 5; Lamb-Jenkinson objective classification; atmospheric circulation classification; physical parameter field; AIR-POLLUTION; CHINA; TRANSPORT; EMISSION; EPISODES; QUALITY; EVENTS; IMPACT;
D O I
10.3390/atmos14060942
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The variation of PM2.5 concentration in the atmosphere is closely related to the variation in weather patterns. The change in weather pattern is accompanied by the corresponding change in atmospheric circulation characteristics. It is necessary to explore the relationship between PM2.5 concentration changes and atmospheric circulation characteristics during pollution periods. In this paper, Lamb-Jenkinson objective classification method is applied to classify daily atmospheric circulation. The pollution periods are calculated and the atmospheric circulation variation rule is obtained. Combined with the physical parameter field (humidity, potential temperature, and potential height), a typical pollution period is analyzed. Additionally, the influence of atmospheric circulation type variation on PM2.5 concentration and transport channel during the pollution period was obtained. The results show that atmospheric circulation types in the study period are dominated by A-type (anticyclonic), N-type (north), and NE-type (northeast), indicating obvious seasonal differences, and the proportion of C-type (cyclonic) circulation was increased significantly in summer. During the pollution period analysis from 2 to 4 January 2019, atmospheric circulation type changed from N-type to NE-type (northeast), the wind direction changed from southeast wind, and the change of pressure gradient was consistent with the trend of the wind field. Moreover, the physical parameter field assisted in verifying the process of the pollution period from the conducive to the accumulation of PM2.5 to conducive to the deposition of pollutants and external transport. The research results would provide theoretical support for PM2.5 prediction during the pollution period and also supply a theoretical and technical basis for the establishment of ecological compensation standards for air pollution and atmospheric environmental control.
引用
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页数:16
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