双月刊

ISSN 1006-9895

CN 11-1768/O4

山东地区一次夏季极端暴雨中尺度系统发展演变过程及机理分析
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作者单位:

1.南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心;2.云降水物理与强风暴院重点实验室LACS;3.中国科学院大学地球与行星科学学院

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基金项目:

(42175012,41975137,41875056,41930967),国家重点研发计划(2019YFC1510400)Funded by the NationalSNaturalSScienceSFoundationSofSChinaS(Grants Nos. 42175012,41975137,41875056,41930967),the National Key Research and Development Program of China (Grant No. 2019YFC1510400) ,2,周玉淑2,3,钟珊珊1*,沈新勇1,4,李小凡55,邓国6,7


Evolution Process and Mechanism Analysis of the Mesoscale System of an Extreme Summer Rainstorm in Shandong Province
Author:
Affiliation:

Key Laboratory of Meteorological Disaster, Ministry Education/ Joint International Research Laboratory of Climate and Environment Change/ Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044

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    摘要:

    对2020年7月22日山东半岛一次极端暴雨天气过程开展观测分析,并利用中尺度模式WRF对此次局地降水过程进行了高分辨率数值模拟,对暴雨过程进行了天气背景和中尺度降雨的诊断。WRF模式较好地再现了此次极端暴雨过程,结果表明:此次极端暴雨过程短时降水强度大且局地性强,在时空上具有明显中尺度特征。降水发生在北抬副高与华北低涡底部之间的西南气流中,强低涡与低空急流是影响此次降水的重要天气系统。西南急流为本次暴雨过程极端水汽的主要输送载体;在弱高空辐散场下,从地表延伸至500hPa高空的深厚低涡是造成本次暴雨的主要影响因子,其时空演变特征与中尺度云团变化一致,与暴雨的发生直接相关。低涡、低空急流和副高之间的相互作用使低涡加强发展,低涡南北部分别有暖湿和干冷气流入流,比湿梯度基本呈现为自南向北递减分布,是典型的伴有低空急流的中尺度低涡流场分布;低涡辐合及其与副高边缘强风速带的共同作用,导致强垂直运动发展并维持,是该次造成本次山东半岛极端暴雨的重要原因。

    Abstract:

    Synoptic circulation pattern and mesoscale system associated with the extreme torrential rain occurring in Shandong Peninsula on July 22, 2020 are analyzed based on conventional observational data and high resolution numerical simulation by using the mesoscale model WRF. The simulation was verified to agree well with the precipitation process. The results show that the rainstorm process has the characteristics of mesoscale features spatially and temporally, represent in its high intensity of short-term rainfall, severe locality, etc. Precipitation occurs in the southwest airflow between the subtropical north elevation and the bottom of the low vortex. Strong vortex and low-level jets are important weather systems that affect this precipitation. The southwest jet stream is the main carrier of extreme water vapor during this heavy precipitation. Under the high-level weak divergent field, the main influencing factor of this rainstorm is the deep low vortex extending from the surface to the 500hPa high altitude. Its temporal and spatial evolution characteristics are consistent with the mesoscale cloud cluster changes shown by the FY-2E hourly TBB data. It is directly related to the occurrence of heavy rain. The interaction between the vortex, the low-level jet and the subtropical high strengthens the development of the low vortex. There are warm; wet and cold dry air flows in, from the north and south of the low vortex. The specific humidity gradient is roughly distributed from south to north, which is a typical flow field distribution of the vortex accompanied by a low-level jet. Convergence of low vortex and its interaction with the strong wind speed belt at the edge of the subtropical high together lead to the development and maintenance of strong vertical motion, together contributed to the persistence of extreme rainstorm.

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  • 收稿日期:2021-12-30
  • 最后修改日期:2022-08-01
  • 录用日期:2022-09-15
  • 在线发布日期: 2022-09-16
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