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 ›› 2023, Vol. 39 ›› Issue (2): 35-43.doi: 10.3969/j.issn.1673-503X.2023.02.005

• 论文 • 上一篇    下一篇

1979—2020年京津冀地区持续雾霾与雾霾少发时段环流稳定分量对比分析

孙树鹏1,张禄1,吴洋1,程善俊2,封国林3,4   

  1. 1. 天津市津南区气象局, 天津 300350
    2. 天津市气候中心, 天津 300074
    3. 国家气候中心气候研究开放实验室, 北京 100081
    4. 扬州大学物理科学与技术学院, 江苏扬州 225002
  • 收稿日期:2022-04-22 出版日期:2023-04-28 发布日期:2023-05-20
  • 作者简介:孙树鹏, 男, 1983年生, 高级工程师, 主要从事短期气候分析与预测研究, E-mail: sun_sp2008 @163.com

Comparison on the stable components between continuous and less fog and haze period in Beijing-Tianjin-Hebei region from 1979 to 2020

Shu-peng SUN1,Lu ZHANG1,Yang WU1,Shan-jun CHENG2,Guo-lin FENG3,4   

  1. 1. Tianjin Jinnan District Meteorological Service, Tianjin 300350, China
    2. Tianjin Climate Center, Tianjin 300074, China
    3. National Climate Center, Beijing 100081, China
    4. College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China
  • Received:2022-04-22 Online:2023-04-28 Published:2023-05-20

摘要:

利用1979—2020年NCEP-DOE再分析资料, 基于EOF分解方法提取京津冀地区持续雾霾和雾霾少发时段的环流稳定分量, 对比分析其空间结构和演变特征。结果表明: 京津冀地区持续雾霾时段的位势高度场稳定分量中存在一个明显的“三极子”结构, 雾霾少发时段该“三极子”结构呈反位相分布。欧亚大陆中纬地区风场稳定分量存在的带状偏强西风距平和中低纬较强的波列, 使京津冀地区处于少冷空气活动的偏暖状态, 有利于持续雾霾天气的维持。欧亚大陆为较强的经向环流特征时, 京津冀地区多处于雾霾少发时段。更长时间尺度(60 d)稳定分量中“三极子”分布形势仍大致存在, 为持续雾霾天气提供了有利的环流背景。稳定分量的变化特征表明, 持续雾霾时段较雾霾少发时段, 稳定分量在雾霾天气发生前期具有更明显且持续性较好的前兆信号。

关键词: 三极子, 稳定分量, 空间结构, 环流形势

Abstract:

Using NCEP/DOE reanalysis data during 1979-2020, the stable components of circulation in the Beijing-Tianjin-Hebei region of China were extracted based on the EOF decomposition method, and their spatial structure and evolution characteristics were compared.The results show that there is an obvious "tripole" structure in the stable component of the geopotential height field during the period of continuous haze in the Beijing-Tianjin-Hebei region, whereas the "tripole" structure shows an inverted phase distribution in the period of less fog and haze.The strong westerly anomaly and wave train in the middle and low latitudes of the wind field in Eurasia make the Beijing-Tianjin-Hebei region in a warmer state with less cold air activity, which is conducive to the maintenance of continuous haze.The Beijing-Tianjin-Hebei region is mostly in the period of less haze when Eurasia is characterized by significant meridional circulation.In the longer time scale (60 days), the "tripole" distribution situation still exists, providing a favorable circulation background for the continuous haze weather.The variation characteristics of the stable component indicate that the stable component has more obvious and better-sustained precursor signals in the early stage of the continuous haze weather than in the period of less fog and haze.

Key words: Tripole, Stable component, Spatial structure, Circulation

中图分类号: