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首页> 外文期刊>Atmospheric chemistry and physics >Feedback effects of boundary-layer meteorological factors on cumulative explosive growth of PM2.5 during winter heavy pollution episodes in Beijing from 2013 to 2016
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Feedback effects of boundary-layer meteorological factors on cumulative explosive growth of PM2.5 during winter heavy pollution episodes in Beijing from 2013 to 2016

机译：2013至2016年北京冬季重污染集中PM2.5累积爆炸增长的反馈效果

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摘要

In January 2013, February 2014, December 2015 and December 2016 to 10 January 2017, 12 persistent heavy aerosol pollution episodes (HPEs) occurred in Beijing, which received special attention from the public. During the HPEs, the precise cause of PM2.5 explosive growth (mass concentration at least doubled in several hours to 10 h) is uncertain. Here, we analyzed and estimated relative contributions of boundary-layer meteorological factors to such growth, using ground and vertical meteorological data. Beijing HPEs are generally characterized by the transport stage (TS), whose aerosol pollution formation is primarily caused by pollutants transported from the south of Beijing, and the cumulative stage (CS), in which the cumulative explosive growth of PM2.5 mass is dominated by stable atmospheric stratification characteristics of southerly slight or calm winds, near-ground anomalous inversion, and moisture accumulation. During the CSs, observed southerly weak winds facilitate local pollutant accumulation by minimizing horizontal pollutant diffusion. Established by TSs, elevated PM2.5 levels scatter more solar radiation back to space to reduce near-ground temperature, which very likely causes anomalous inversion. This surface cooling by PM2.5 decreases near- ground saturation vapor pressure and increases relative humidity significantly; the inversion subsequently reduces vertical turbulent diffusion and boundary-layer height to trap pollutants and accumulate water vapor. Appreciable near-ground moisture accumulation (relative humidity 80 %) would further enhance aerosol hygroscopic growth and accelerate liquid-phase and heterogeneous reactions, in which incompletely quantified chemical mechanisms need more investigation. The positive meteorological feedback noted on PM2.5 mass explains over 70% of cumulative explosive growth.
机译：2013年1月，2014年2月，2015年12月至2016年12月至2016年1月10日至2017年1月10日，在北京发生了12个持久的重型气溶胶污染集发作（HPE），从公众接受了特别关注。在HPE期间，PM2.5爆炸性生长的精确原因（数小时至10小时至少加倍的质量浓度至少加倍）是不确定的。在这里，我们使用地面和垂直气象数据分析和估计边界层气象因素对这种生长的相对贡献。北京HPE普遍是通过运输阶段（TS）的特征，其气溶胶污染形成主要由北京南部运输的污染物和累积阶段（CS）引起的，其中PM2.5质量累积爆炸性增长是占主导地位的通过稳定的大气分层特性，横向轻微或平静的风，近乎磨碎的异常反转和水分累积。在CSS期间，通过最大限度地减少水平污染物扩散，观察到的横向弱风促进了局部污染物积累。由TSS建立，升高的PM2.5级别散射更多的太阳辐射回到空间以减少近地温度，这可能导致异常反转。通过PM2.5的这种表面冷却降低了近饱和蒸气压，显着增加了相对湿度;反转随后减少了垂直湍流扩散和边界层高度以捕获污染物并累积水蒸气。可观的近地水分积累（相对湿度＆ 80％）将进一步增强气溶胶吸湿生长并加速液相和异质反应，其中不完全定量的化学机制需要更多的调查。 PM2.5质量上指出的正气象反馈解释了累积爆炸性增长的70％以上。

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  • 来源
    《Atmospheric chemistry and physics》 |2018年第1期|共12页
  • 作者

    Zhong Junting; Zhang Xiaoye; Dong Yunsheng; Wang Yaqiang; Liu Cheng; Wang Jizhi; Zhang Yangmei; Che Haochi;

  • 作者单位

    Chinese Acad Meteorol Sci State Key Lab Severe Weather Beijing Peoples R China;

    Chinese Acad Meteorol Sci State Key Lab Severe Weather Beijing Peoples R China;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei Anhui Peoples R China;

    Chinese Acad Meteorol Sci State Key Lab Severe Weather Beijing Peoples R China;

    Chinese Acad Sci Ctr Excellence Reg Atmospher Environm IUE Xiamen Peoples R China;

    Chinese Acad Meteorol Sci State Key Lab Severe Weather Beijing Peoples R China;

    Chinese Acad Meteorol Sci State Key Lab Severe Weather Beijing Peoples R China;

    Univ Oxford Dept Phys Oxford England;

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  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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