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天津冬季重霾污染过程及气象和边界层特征分析

刘丽丽 王莉莉

刘丽丽, 王莉莉. 天津冬季重霾污染过程及气象和边界层特征分析[J]. 气候与环境研究, 2015, 20(2): 129-140. doi: 10.3878/j.issn.1006-9585.2014.14096
引用本文: 刘丽丽, 王莉莉. 天津冬季重霾污染过程及气象和边界层特征分析[J]. 气候与环境研究, 2015, 20(2): 129-140. doi: 10.3878/j.issn.1006-9585.2014.14096
LIU Lili, WANG Lili. Characteristics of Winter Heavy Pollution Episodes and Meteorological Causes and Structures of Boundary Layer in Tianjin[J]. Climatic and Environmental Research, 2015, 20(2): 129-140. doi: 10.3878/j.issn.1006-9585.2014.14096
Citation: LIU Lili, WANG Lili. Characteristics of Winter Heavy Pollution Episodes and Meteorological Causes and Structures of Boundary Layer in Tianjin[J]. Climatic and Environmental Research, 2015, 20(2): 129-140. doi: 10.3878/j.issn.1006-9585.2014.14096

天津冬季重霾污染过程及气象和边界层特征分析

doi: 10.3878/j.issn.1006-9585.2014.14096
基金项目: 国家自然科学基金项目41230642,中国科学院战略性先导科技专项(B类)XDB05020203,欧盟PANDA项目606719

Characteristics of Winter Heavy Pollution Episodes and Meteorological Causes and Structures of Boundary Layer in Tianjin

  • 摘要: 京津冀大气灰霾污染严重,天津市作为其核心组成之一其污染形势亦严峻。选取2013年2月20~28日天津重霾污染时段7站PM2.5(空气动力学当量直径小于等于 2.5 μm的颗粒物,即细颗粒物)和气态污染物数据,结合北京污染数据、地面气象要素、能见度、边界层温湿和风廓线、后向轨迹,深入分析重霾污染过程特征及气象和边界层成因。结果显示,研究时段天津PM2.5、SO2、NO2、CO和O3浓度均值为150、87、56、2.4和 22 μg m-3, 气态污染物各站差异显著,但仅有SO2全面超过国家空气质量一级标准(50 μg m-3),而PM2.5具有区域同步变化特征,且严重超标,是一级标准(35 μg m-3)的2~8倍,最高小时均值高达364 μg m-3;高浓度PM2.5是导致低能见度的主因,能见度小于10 km对应PM2.5阈值为50 μg m-3。弱风和高湿度导致局地排放累积,PM2.5始增,在高湿度条件下,持续偏南风促使其稳步增加,配合弱北风和弱东风PM2.5震荡上扬,污染高值阶段,南北气流短时迅速切换,区域污染传输叠加污染的循环累积,PM2.5浓度峰值达到最高;除因边界层强东风导致的平流逆温外,高浓度PM2.5与平流逆温密切相关;高污染时段高湿主要集中在500 m以下,且随高度递减幅度较大;位于200~600 m的低空急流一定程度抑制污染上升,尤其持续强东风使PM2.5浓度稳步降低到二级水平,污染迅速有效清除最终依赖整层的强西北风。北京、环绕天津的河北中部和西南部地区对天津重污染有显著贡献。
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出版历程
  • 收稿日期:  2014-05-12
  • 修回日期:  2014-10-21

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