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 ›› 2019, Vol. 35 ›› Issue (4): 16-24.doi: 10.3969/j.issn.1673-503X.2019.04.003

• 论文 • 上一篇    

2017年秋季河南罕见连阴雨天气特征及成因分析

朱玉周1, 吕晓娜1, 廖荣伟2   

  1. 1. 河南省气象局, 河南 郑州 450003;
    2. 中国气象科学研究院, 北京 100081
  • 收稿日期:2018-05-17 修回日期:2019-03-26 发布日期:2019-09-03
  • 通讯作者: 廖荣伟,男,高级工程师,E-mail:liaorw@cma.gov.cn。 E-mail:liaorw@cma.gov.cn
  • 作者简介:朱玉周,男,1980年生,工程师,主要从事专业气象预报研究,E-mail:frontrain@qq.com。
  • 基金资助:
    国家重点研发计划项目(2017YFC1501801)资助。

Characteristics and causes of rare continuous rain weather event in He'nan province during autumn in 2017

ZHU Yu-zhou1, LV Xiao-na1, LIAO Rong-wei2   

  1. 1. He'nan Meteorological Service, Zhengzhou 450003, China;
    2. Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • Received:2018-05-17 Revised:2019-03-26 Published:2019-09-03
  • Supported by:
    This work is supported by Science and Technology Project of SGCC (Basic Theory Research on Modeling, Simulation and Coordination Control of Voltage Source Converter and DC Power Grid, No.SGRIZLKJ[2015]457).

摘要: 2017年8月下旬至10月中旬河南发生了近14 a来罕见秋季连阴雨过程。利用1961-2017年河南省地面气候整编资料和NCEP/NCAR再分析资料,采用相关分析法、T检验、小波分析及带通滤波等方法,对此次连阴雨过程的大气环流特点进行分析。结果表明:2017年秋季河南连阴雨期间,乌拉尔山高压脊、贝加尔湖低槽和西太平洋副热带高压较常年同期偏强且长时间维持;东欧和里海-巴尔喀什湖两个地区是此次连阴雨过程的上游关键区域,东欧地区大气环流具有准双周到30 d的振荡周期,里海-巴尔喀什湖地区具有4-8 d的振荡周期。东亚200 hPa急流轴东西跨度和急流核的极大风速较常年同期偏大;急流区西南部的辐散区在河南上空有抽吸作用,有利于降水的发生;高空急流纬向风速有三次加强过程,与三次连阴雨过程相对应。在不同的连阴雨阶段水汽输送源地和输送通道不同,三个阶段的水汽来源分别为印度洋、中国南海和西太平洋。

关键词: 中高纬阻塞形势, 低频振荡, 急流, 水汽输送

Abstract: An event of continuous rain weather occurred from late August to mid-October in 2017 in He'nan province;such weather occurred rarely in the past 14 years.The characteristics of atmospheric circulation during this event were analyzed based on meteorological data from 1961 to 2017 in He'nan province and the National Center for Environment Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data.Different analysis methods were used in this study,including the correlation analysis method,the T-test method,the wavelet analysis method,and the band-pass filter analysis method,etc.The results show that the Wular Ridge,the Bay Lake Trough,and the Western Pacific Subtropical High are abnormally strong and maintain for a long time during this event.Eastern Europe and Caspian-Bahu areas are the key upstream regions for the continuous rainy process.The atmospheric circulation in the Eastern Europe has an oscillation period from quasi two weeks to 30 days,while the oscillation period in the Caspian-Bahu is from 4 to 8 days.The east-west span of the 200-hPa jet axis and the maximum wind speed of the jet core are abnormally larger than that on average in the same period.The divergence zone in the southwestern part of the jet zone has the suction effect over He'nan province,which is conducive to the occurrence of precipitation.The zonal wind speeds of the upper jet enhance three times,corresponding to three continuous rainy processes.The water vapor transport sources and channels are different during different continuous rainy processes;water vapor in these three rainy processes originates from the Indian Ocean,the South China Sea,and the Western Pacific Ocean,respectively.

Key words: Blocking situation at mid-high latitudes, Low-frequency oscillation, Jet, Water vapor transport

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