Journal of Arid Meteorology

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Characteristic Analysis of a Continuous and Serious Pollution Weather Process in Shenyang

DUAN Yunxia 1,2, LI Deqin3, TIAN Li3, WANG Saidi4,SUN Xin 3, WU Yutong 1 , JIANG Shan1   

  1. 1. Shenyang Meteorological Bureau of Liaoning Province, Shenyang 110168, China;
    2. College of Atmosphere Science,Nanjing University of Information Science & Technology,Nanjing 210044, China;
    3. Shenyang Central Meteorological Observatory, Shenyang 110116, China;
    4. Fushun Meteorological Bureau of Liaoning Province, Fushun 113000
  • Online:2016-11-01 Published:2016-11-01

沈阳市一次持续性重污染天气过程特征分析

段云霞 1,2李得勤3田莉3王赛頔4孙欣3吴宇童1姜珊1   

  1. 1. 辽宁省沈阳市气象局,辽宁沈阳110168;2. 南京信息工程大学,江苏南京210044;
    3. 沈阳中心气象台,辽宁沈阳110166;4. 辽宁省抚顺市气象局,辽宁抚顺113000
  • 作者简介:段云霞(1983- ),女,内蒙古乌兰察布人,博士研究生,主要从事雷达资料反演、台风数值模拟研究. E-mail: yxduan@163.com
  • 基金资助:

    国家自然科学基金“参数优化和数据同化用于土壤湿度估算研究”(41105064)和“辽宁省强对流专家型预报员团队”共同资助

Abstract:

Based on conventional ground data, sounding data, wind profile radar data and pollutant data from environmental monitoring stations, a continuous and heavy pollution weather occurring during November 7-11, 2015 in Shenyang was analyzed, and the main characteristics were summarized as follows: (1) The pollution weather maintained a long time, the concentration of PM2.5 was more than 500 μg·m-3 for nearly 21 hours, and its’ maximum was 1 287.83 μg·m-3 during the period. The main pollution component was CO. (2) Straight zonal circulation, weak cyclonic circulation and high humidity conditions provided advantage meteorological conditions for the heavy pollution weather developing and lasting, and temperature being around 0 ℃ for a long time was also a main feature during the heavy pollution weather process. (3) From the ground to 850 hPa height, the average horizontal wind speed was close to 2 m·s-1, the whole atmosphere stratification was in stable static with high moisture conditions and existence of temperature inversion, which inhibited the vertical transportation of pollutants. (4) Satellite remote sensing monitoring showed there were a lot of fire points in Jilin and Heilongjiang provinces, and it was the time of straw burning. The atmospheric trajectory analysis also showed the northerly winds provided favorable weather conditions for pollutants transportation.

Key words:  weather pollution, haze, weather features, meteorological condition

摘要:

使用常规地面、探空资料以及风廓线雷达和环境监测站污染物资料,对2015年11月7—11日沈阳市一次持续性重污染天气过程进行分析,结果表明:(1)此次污染过程持续时间长,PM2.5浓度维持在500 μg·m-3以上近21 h,期间峰值达到1 287.83 μg·m-3,主要污染物为CO;(2)平稳的高空环流、弱气旋性环流及高湿条件为这次重污染天气的发生、发展和维持提供了有利的气象条件,0 ℃左右的温度长时间维持也为该次过程的一个主要特征;(3)重污染期间从地面到850 hPa高度上水平风速均接近2 m·s-1,整层大气静稳,伴随着较好的湿度条件和多个逆温层结的存在,抑制了污染物的垂直输送;(4)卫星遥感监测显示吉林和黑龙江一带有大量火点存在,此时正值冬季秸秆燃烧,大气轨迹分析显示,污染期间偏北风为污染物的传输提供了有利的气象条件。

关键词: 污染天气, 霾, 天气特征, 气象条件

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