高原气象

高原气象 >

2017 , Vol. 36 >Issue 6: 1674 - 1681

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00142

论文

北京夏季一次罕见偏南大风天气的成因分析

  • 于波 ,
  • 荆浩 ,
  • 孙继松 ,
  • 张文龙
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  • 北京市气象台, 北京 100089;中国气象科学研究院灾害天气国家重点实验室, 北京 100081;中国气象局北京城市气象研究所, 北京 100089

收稿日期: 2016-10-24

  网络出版日期: 2017-12-28

基金资助

公益性行业（气象）科研专项项目（GYHY201506006）；中国气象局预报员专项项目（CMAYBY2015-001）

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The Analysis on an Infrequent Southerly Gust of Beijing in Summer

  • YU Bo ,
  • JING Hao ,
  • SUN Jisong ,
  • ZHANG Wenlong
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  • Beijing Municipal Weather Forecast Center, Beijing 100089, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China

Received date: 2016-10-24

  Online published: 2017-12-28

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摘要

利用自动站观测资料、NCEP/NCAR再分析资料、多普勒雷达资料和多普勒雷达四维变分分析系统资料，对北京盛夏时节出现的一次大风天气进行研究分析。结果表明，2014年7月14日午夜，在弱天气尺度强迫的背景下，北京大部分地区出现了持续数小时的6~8级偏南风，造成此次大风天气的成因是：（1）前期（14日20：00-23：00，北京时）河北东南部-山东北部的局地强降水导致该地温度骤降、气压升高，形成冷池出流；冷池北部为弱北风和暖空气，另外受地形影响，出流气流向北推进形成偏南风；（2）偏南风与北京东北部平谷地区出现的局地强降水形成正反馈，偏南风的辐合作用有利于降水的发生；同时伴随着偏南气流的发展，北京上空的上升气流也随之增强，因此降水区的入流抽吸作用进一步促进了偏南风的加速。

关键词： 偏南大风; 冷池出流; 入流; 抽吸作用

本文引用格式

于波 , 荆浩 , 孙继松 , 张文龙 . 北京夏季一次罕见偏南大风天气的成因分析[J]. 高原气象, 2017 , 36(6) : 1674 -1681 . DOI: 10.7522/j.issn.1000-0534.2016.00142

Abstract

The infrequent southerly gust in Beijing in 2014 summer was analyzed by using observational data, NCEP/NCAR reanalysis data, Doppler radar data and VDRAS data. Under the unfavorable weather condition, there was 6~8 grade southerly gust in most area of Beijing in the midnight on 14 July 2014. The causes of the gust can be concluded in two aspects. Firstly, the local heavy precipitation between southeast of Hebei province and north of Shandong province caused local temperature decrease and pressure surge, therefore, the outflow of cold air was formed. Because of weak northerly wind, warm air in the north of cold pool and topography, the outflow turned to the southerly wind. Secondly, the positive effect between southerly wind and local precipitation in Pinggu District, which is in the northeast of Beijing, was beneficial to convergence for precipitation. With the development of southerly wind, the ascending motion also strengthened. Consequently, the pumping action of precipitation promoted the acceleration of southerly wind.

Key words： Southerly gust; cold pool outflow; inflow; pumping action

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