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严文莲, 刘端阳, 孙燕, 魏建苏, 濮梅娟. 秸秆焚烧导致的江苏持续雾霾天气过程分析[J]. 气候与环境研究, 2014, 19(2): 237-247. DOI: 10.3878/j.issn.1006-9585.2014.13209
引用本文: 严文莲, 刘端阳, 孙燕, 魏建苏, 濮梅娟. 秸秆焚烧导致的江苏持续雾霾天气过程分析[J]. 气候与环境研究, 2014, 19(2): 237-247. DOI: 10.3878/j.issn.1006-9585.2014.13209
YAN Wenlian, LIU Duanyang, SUN Yan, WEI Jiansu, PU Meijuan. Analysis of the Sustained Fog and Haze Event Resulting from Crop-Burning Residue in Jiangsu Province[J]. Climatic and Environmental Research, 2014, 19(2): 237-247. DOI: 10.3878/j.issn.1006-9585.2014.13209
Citation: YAN Wenlian, LIU Duanyang, SUN Yan, WEI Jiansu, PU Meijuan. Analysis of the Sustained Fog and Haze Event Resulting from Crop-Burning Residue in Jiangsu Province[J]. Climatic and Environmental Research, 2014, 19(2): 237-247. DOI: 10.3878/j.issn.1006-9585.2014.13209

秸秆焚烧导致的江苏持续雾霾天气过程分析

Analysis of the Sustained Fog and Haze Event Resulting from Crop-Burning Residue in Jiangsu Province

  • 摘要: 利用常规观测资料和NCEP再分析资料,从污染情况、环流背景、地面气象要素特征、水汽、热力及动力条件等几个方面对江苏2012年6月中上旬持续雾霾天气进行了分析。结果表明:江苏及周边省市秸秆焚烧造成大量的气溶胶粒子悬浮于空中,是造成江苏出现持续不同程度的霾天气的主要原因,同时也为雾滴形成提供了丰富的凝结核;中高层冷空气强度未能完全破坏底层相对稳定的层结,较小的风速和较大的湿度有利于雾霾的发展,重度霾或雾风速多在3 m/s以下,且相对湿度在80%以上。频繁的弱降水过程对雾的形成和霾的加重起到了重要的作用;低层的逆温或近中性层结的维持,为雾霾持续存在提供了有利的层结条件,且浓雾形成主要有辐射贴地逆温和平流逆温两种形式;垂直上升运动与雾霾的发展之间有着互相影响的紧密联系,在具备一定的水汽条件时,底层弱的上升运动有利于雾体的向上发展从而促进雾的加浓。后向轨迹模拟雾霾相对较严重的6月10日污染轨迹表明沿江和苏南地区污染物浓度上升除了本地悬浮颗粒物外,安徽境内的污染物的输送也是一个重要因素,而北部地区更多还是本地的污染源。

     

    Abstract: By using conventional observation data and NCEP reanalysis data, a sustained fog and haze event that occurred in Jiangsu Province in early and middle June was analyzed from several perspectives including pollution, circulation background, surface meteorological characteristics, and vapor, thermal, and dynamic conditions. The results showed that the residue of crop-burning, which caused a large aerosol burden, was the main reason for the sustained haze, whereas the heavy fog was formed mainly by radiation and advection inversions. The aerosol particles also provided condensation nuclei for fog formation. High-level cold air did not completely dissolve the underlying relatively stable stratification. Lower wind speed and higher relative humidity of less than 3 m/s and greater than 80%, respectively, were shown to be favorable for the development of the fog and haze. Frequent weak precipitation processes also played an important role in the fog formation and aggravated the haze conditions. The maintenance of near-surface temperature inversion or nearly neutral stratification provided favorable stratification conditions for the persistence of the fog and haze. Moreover, a strong correlation was present between vertical upward movement and haze development. Underlying weak upward motion with specific moisture conditions was conducive to the upward development of the mist. By using backward trajectory simulation, the authors determined that in addition to local suspended particulate matter, the pollutant transport from Anhui Province was an important factor for the sustained fog and haze. In the northern regions, local pollution sources were the main factors.

     

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