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Dominant Synoptic Patterns and Their Relationships with PM2.5 Pollution in Winter over the Beijing-Tianjin-Hebei and Yangtze River Delta Regions in China.
- Source :
- Journal of Meteorological Research; Aug2019, Vol. 33 Issue 4, p765-776, 12p
- Publication Year :
- 2019
-
Abstract
- This paper concerns about the episodes of PM<subscript>25</subscript> pollution that frequently occur in China in winter months. The severity of PM<subscript>2.5</subscript> pollution is strongly dependent on the synoptic-scale atmospheric conditions. We combined PM<subscript>2.5</subscript> concentration data and meteorological data with the Hybrid Single Particle Lagrangian Integrated Trajectory model (HYSPLIT4) to investigate the dominant synoptic patterns and their relationships with PM<subscript>2.5</subscript> pollution over the Beijing-Tianjin-Hebei (BTH) and Yangtze River Delta (YRD) regions in the winters of 2014–17. The transport of PM<subscript>2.5</subscript> from the BTH to YRD regions was examined by using cluster analysis and HYSPLIT4. It is found that the level of PM<subscript>2.5</subscript> pollution over the BTH region was higher than that over the YRD region. The concentration of PM<subscript>2.5</subscript> in the atmosphere was more closely related to meteorological factors over the BTH region. The episodes of PM<subscript>2.5</subscript> pollution over the BTH region in winter were related to weather patterns such as the rear of a high-pressure system approaching the sea, a high-pressure field, a saddle pressure field, and the leading edge of a cold front. By contrast, PM<subscript>2.5</subscript> pollution episodes in the YRD region in winter were mainly associated with the external transport of cold air, a high-pressure field, and a uniform pressure field. Cluster analysis shows that the trajectories of PM<subscript>2.5</subscript> were significantly different under different weather patterns. PM<subscript>2.5</subscript> would be transported from the BTH to the YRD within 48 h when the PM<subscript>2.5</subscript> pollution episodes were associated with three different kinds of weather patterns: the rear of a high-pressure system approaching the sea, the high-pressure field, and the leading edge of a cold front over the BTH region. This suggests a possible method to predict PM<subscript>2.5</subscript> pollution episodes based on synoptic-scale patterns. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20956037
- Volume :
- 33
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Journal of Meteorological Research
- Publication Type :
- Academic Journal
- Accession number :
- 138397115
- Full Text :
- https://doi.org/10.1007/s13351-019-9007-z