Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 125, Issue 23, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JD033153
Keywords
meteorological variables; synoptic weather circulations; conceptual weather models; China
Categories
Funding
- National Key Research and Development Program of China [2016YFA0602003]
- National Natural Science Foundation of China [91544229, 41605096, 41605091, 41805120]
- Department of Science and Technology (DST), Science and Engineering Research Board (SERB) sponsored Start-up Research Grant scheme under Science and engineering research board (SERB) of Department of science and technology (DST) [SRG/2020/001445]
- DST, Government of India [SR/FST/PS-1/2018/35]
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In the present study, the characteristics of weather conditions and local meteorological variables over the Beijing-Tianjin-Hebei (BTH) and the Yangtze River Delta (YRD) regions in the winter are analyzed using the principal component analysis (PCA) method and daily PM2.5 accumulation rate. Typical synoptic weather patterns over China in the winter can be classified into four types. During the Type 1 synoptic weather pattern, China is under the influence of the Siberian High, and northerly winds prevail; this situation is beneficial to the transport of pollutants from north to south. However, when the Siberian High is weak, southerly winds prevail which may result in the transport of pollutants from south to north. The Type 2 weather pattern refers to a weak high pressure located in the BTH resulting in the accumulation of pollutants. During the Type 3 weather pattern, an intense cold Siberian High moves to the south and affects the northern areas of China. The associated front brings heavy precipitation in the YRD resulting in the wet deposition of pollution. During the Type 4 weather condition, the weak Siberian High is blocked by the northeast cold vortex and moves towards the south, causing the accumulation of pollution in the YRD. The PCA model shows that there are two transport pathways for pollutants to the BTH (YRD) area: one from the YRD (BTH) and Shandong during Types 1 and 2 (Types 1 and 3) situations and the other one from the central provinces during Type 4 (Types 1 and 4).
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