Establishment of Conceptual Schemas of Surface Synoptic Meteorological Situations Affecting Fine Particulate Pollution Across Eastern China in the Winter
Establishment of Conceptual Schemas of Surface Synoptic Meteorological Situations Affecting Fine Particulate Pollution Across Eastern China in the Winter
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DOI：
10.1029/2020jd033153
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
X. Hou;B. Zhu;K. R. Kumar;G. Leeuw;Wen Lu;Qian Huang;Xiao-Xin Zhu
中科院分区：
文献类型：
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作者：
X. Hou;B. Zhu;K. R. Kumar;G. Leeuw;Wen Lu;Qian Huang;Xiao-Xin Zhu
采用主成分分析（PCA）方法和PM2.5日累积速率分析了京津冀和长三角地区冬季天气条件和局地气象变量特征。中国冬季典型的天气型可分为四类。第1型天气型中，中国受西伯利亚高压影响，以偏北风为主；这种情况有利于污染物从北向南的输送。然而，当西伯利亚高压较弱时，偏南风盛行，可能导致污染物由南向北输送。第二类天气型态是指位于BTH的弱高压导致污染物积聚。在第3型天气模式中，强烈寒冷的西伯利亚高压向南移动并影响中国北部地区。伴生锋面给长三角带来强降水，导致污染湿沉降。在第4型天气条件下，弱西伯利亚高压被东北冷涡阻挡并向南移动，造成长三角污染积聚。主成分分析模型表明，污染物在1型和2型（1型和3型）情况下有两条输送路径，一条是来自长三角（BTH）和山东，另一条是在4型（1型和4型）情况下来自中部省份。
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).