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气象:2023,49(12):1451-1467
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“23·7”河北太行山东麓罕见特大暴雨特征及成因
杨晓亮,金晓青,孙云,陈碧莹,梁天,杨敏,闫雪瑾,李江波
(中国气象局雄安大气边界层重点开放实验室,河北雄安 071800; 河北省气象与生态环境重点实验室,石家庄 050021; 河北省气象台,石家庄 050021; 河北省气象行政技术服务中心,石家庄 050021)
Evolution Characteristics and Formation of the July 2023 Severe Torrential Rain on the Eastern Foothills of Taihang Mountains in Hebei Province
YANG Xiaoliang,JIN Xiaoqing,SUN Yun,CHEN Biying,LIANG Tian,YANG Min,YAN Xuejin,LI Jiangbo
(CMA Xiong’an Atmospheric Boundary Layer Key Laboratory, Hebei, Xiong’an 071800; Key Laboratory of Meteorology and Ecological Environment of Hebei Province, Shijiazhuang 050021; Hebei Meteorological Observatory, Shijiazhuang 050021; Hebei Meteorological Administrative and Technical Service Center, Shijiazhuang 050021)
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投稿时间:2023-09-03    修订日期:2023-10-25
中文摘要: 受台风杜苏芮北上减弱的低压影响,2023年7月29日至8月1日,京津冀地区遭受了历史罕见的特大暴雨,海河发生流域性特大洪水并造成人员伤亡和经济损失。利用高空观测、地面自动站、S波段多普勒天气雷达、风廓线雷达、ERA5再分析资料等,对此次天气过程进行了初步分析。结果表明:特大暴雨过程具有累计降水量大、持续时间长、地形作用明显等特征。台风杜苏芮、卡努提供了极为有利的水汽条件,华北北部形成的高压坝阻挡了台风环流北上,华北地区先后经历了阵性降水、台风倒槽降水和倒槽减弱阶段对流性降水三个阶段,降水落区的叠加效应是形成罕见特大暴雨的主要原因。台风倒槽阶段850 hPa切变线受太行山阻挡移动缓慢,降水持续时间长,初期大气处于近中性状态,雨强整体平稳,30日午后对流开始加强,河北中部降水区冷池出流的偏北风与偏东风形成地面辐合线,使得河北东南部高能区中触发的对流单体发展加强为MCS,移入保定后形成“列车效应”;太行山冷池出流的偏北风与地面东南风形成辐合线触发不稳定能量释放,是30日夜间河北西南部降水维持的原因。31日早晨超过20m·s-1的东南风急流再次建立,造成北京南部超过110mm·h-1的强降水。
Abstract:Influenced by the weakening low pressure of Typhoon Doksuri, the Beijing-Tianjin-Hebei Region suffered the unprecedented extremely severe torrential rain from 29 July to 1 August 2023, with catastrophic floods in the Haihe River Basin causing serious casualties and economic losses. A preliminary analysis of this rarely seen severe precipitation event is conducted in this article based on conventional observations, S-band Doppler weather radar data, wind profile radar data, and ERA5 reanalysis data. The results show that this extremely severe torrential rain process was characterized by enormous accumulated rainfall, and long duration, affected significantly by terrain. Typhoons Doksuri and Khanun provided extremely favorable water vapor conditions, but the high pressure barrier formed in northern part of North China blocked the northward typhoons. The North China Region experienced three stages: intermittent rainfall, typhoon inverted-trough precipitation and convective precipitation during the weakening stage of the inverted-trough, and the superposition of precipitation areas in three stages was the main cause for the formation of the extremely severe torrential rain. During the stage of weakening inverted-trough, the shear line at 850 hPa moved slowly due to the obstruction of the Taihang Mountains, causing the long duration of precipitation. The atmosphere was in a near neutral state with stable rainfall intensity in the early stages. From the afternoon of 30 July, convective precipitation began to strengthen. The convergence line formed by the northerly wind which was generated by the outflow of the cold pool in the central rainfall area of Hebei Province and the surface southeast wind triggered the release of unstable energy and also strengthened the development of triggered convective cells into mesoscale convective system (MCS) in the high-energy area of southeastern Hebei. This MCS moved into Baoding, resulting in the “train effect”. The convergence line between the surface north wind generated by the cold pool of Taihang Mountains and the southeast wind triggered the release of unstable energy, which was the reason for the maintenance of severe precipitation in southwestern Hebei over the night of 30 July. On the morning of 31 July, a southeast low-level jet over 20 m·s-1 was established again, leading to the extremely severe torrential rain exceeding 110 mm·h-1 in the southern part of Beijing.
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基金项目:中国气象局雄安大气边界层立体监测和精细化模拟青年创新团队、河北省重点研发计划项目(21375404D)、河北省灾害性天气机理研究创新团队和气象业务核心能力提升工程-暴雨强对流野外观测项目共同资助
引用文本:
杨晓亮,金晓青,孙云,陈碧莹,梁天,杨敏,闫雪瑾,李江波,2023.“23·7”河北太行山东麓罕见特大暴雨特征及成因[J].气象,49(12):1451-1467.
YANG Xiaoliang,JIN Xiaoqing,SUN Yun,CHEN Biying,LIANG Tian,YANG Min,YAN Xuejin,LI Jiangbo,2023.Evolution Characteristics and Formation of the July 2023 Severe Torrential Rain on the Eastern Foothills of Taihang Mountains in Hebei Province[J].Meteor Mon,49(12):1451-1467.