主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2017, Vol. 33 ›› Issue (4): 29-39.doi: 10.3969/j.issn.1673-503X.2017.04.004

• 论文 • 上一篇    下一篇

基于轨迹聚类河南地区大气污染过程空气输送通道研究

杨浩1, 白永清1, 刘琳1, 许冠宇2, 王玲玲3, 孔海江4   

  1. 1. 中国气象局武汉暴雨研究所 暴雨监测预警湖北省重点实验室, 湖北 武汉 430205;
    2. 武汉中心气象台, 湖北 武汉 430205;
    3. 河南省环境监测中心, 河南 郑州 450004;
    4. 河南省气象台, 河南 郑州 450003
  • 收稿日期:2016-11-25 修回日期:2017-03-10 出版日期:2017-08-30 发布日期:2017-08-30
  • 作者简介:杨浩,男,1986年生,助理研究员,主要从事气象环境研究,E-mail:yanghao0202@126.com。
  • 基金资助:
    湖北省气象局科技发展基金项目(2015Y04)和国家自然科学基金项目(41375057、41541037)共同资助。

Analysis of air transport channels during pollution process in He'nan province based on trajectory clustering

YANG Hao1, BAI Yong-qing1, LIU Lin1, XU Guan-yu2, WANG Ling-ling3, KONG Hai-jiang4   

  1. 1. Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430205, China;
    2. Wuhan Central Meteorological Observatory, Wuhan 430205, China;
    3. He'nan Environmental Supervision Center, Zhengzhou 450004, China;
    4. He'nan Meteorological Observatory, Zhengzhou 450003, China
  • Received:2016-11-25 Revised:2017-03-10 Online:2017-08-30 Published:2017-08-30

摘要: 大气污染除了受本地污染源的影响外,外来污染物的输送也是重要的影响因子之一。本文基于拉格朗日混合单粒子轨迹模型(HYSPLIT)分析了河南省重污染过程空气输送通道的特征,并结合地面风场观测资料和NCEP再分析资料对污染发生时的气象背景场进行了探讨。结果表明:在1986-2015年冬季气候平均态下,河南省盛行西北气流,空气输送主要来自西北欧亚大陆,经河北、陕西和山西等地区进入河南地区。2015年河南省17次重污染过程主要空气污染输送分别来自南方(32%)、偏北方(24%)和偏东方(27%),3条通道在输送过程中高度基本维持在900 hPa以下;重污染过后西北风加强,南风消失,污染物迅速扩散。由2015年12月5-13日河南地区重污染过程的模拟表明,偏北空气输送通道所占比例虽然不是最高的,但经过污染物浓度高值区携带的污染物较多,同时由于风速减弱,不利于污染物扩散。气象观测资料进一步证明河南省重污染过程发生时处于静稳天气状态,同时东南风带来了较多的水汽输送,相对湿度偏高不利于污染扩散。

关键词: 轨迹聚类, 大气污染, 输送通道, 后向轨迹

Abstract: Besides local sources of pollution,the outside pollutants transport is one of the most important factors significantly affecting air pollution.Lagrangian mixed with single particle trajectory model (HYSPLIT) was used to investigate the characteristics of air transport channels during severe pollution events in He'nan province.Meteorological background fields were also analyzed using the surface wind field and NCEP reanalysis data.The results indicate that the northwest airflow is prevalent in winter over He'nan province during 1986 and 2015.The air masses mainly come from Eurasia,passing Hebei,Shaanxi and Shanxi provinces,finally reaching He'nan province.Statistics of the 17 severe pollution events in 2015 shows that the air transport channels are mainly from the south (32%),the north (24%) and the east (27%) direction,respectively,which are generally below 900 hPa.After severe pollution event,the northwest wind becomes stronger whereas the south wind disappears,then the pollutants spread promptly.The simulation on severe pollution events occurring during December 5-13,2015 suggests although it doesn't account for the highest proportion,the northern channel brings most pollutants while passing the higher-pollutant areas.The weaker wind against diffusion in this channel contributes to pollution as well.Meteorological observations further confirm that static stability situations control He'nan province while severe pollution occurs.Much vapor is brought by the southeast wind,and high relative humidity doesn't favor diffusion.

Key words: Trajectory clustering, Air pollution, Air transport channel, Back trajectory

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