文章摘要
水汽和高低空急流对郑州“7.20”极端暴雨影响的数值模拟分析
Numerical Simulation Analysis of the Influence of Vapor and Upper-Low-Level Jet on the Heavy Rainstorm in Zhengzhou on 20 July 2021
投稿时间:2022-05-09  修订日期:2022-06-23
DOI:
中文关键词: 暴雨  水汽  高低空急流  数值试验
英文关键词: Rainstorm  vapor  jet  numerical simulation
基金项目:国家自然科学基金项目(42175167)、灾害天气国家重点实验室开放课题(2021LASW-A11)
作者单位邮编
程佳佳 中国气象科学研究院 100000
徐国强 中国气象局地球科学数值预报中心 100000
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中文摘要:
   针对郑州“7·20”特大暴雨过程,使用数值模式对此次极端强降水过程中水汽与高低空急流的影响进行了数值试验分析。结果表明,CMA_MESO模式对此次暴雨过程的模拟效果较好;此次暴雨过程中水汽来源主要为台风“烟花”北侧的东南急流携带的来自西太平洋与印度洋的水汽以及台风“查帕卡”北侧东南气流携带的来自南海的水汽;降水及水汽输送对水汽含量十分敏感,水汽含量微小的变化便会使郑州市上空气流辐合区强度减弱,水汽累积减少,降水范围向河南省北部缩小,降水强度大幅度减弱;低空急流对应的气流辐合区是郑州市上空出现强垂直上升运动中心主要机制,低空急流减弱后,水汽辐合减弱,降水减少,降水中心位置偏西南,高空急流对降水的影响与低空急流相比较小。
英文摘要:
   Aiming at the heavy rainstorm in Zhengzhou City, Henan Province on July 20, 2021, a numerical model was used to analyze the effects of vapor and upper-low-level jets. The results show that the simulation ofthe CMA_MESO model was satisfied with the rainstorm process. One part of vapor during the rainstorm comes from western Pacific and Indian Ocean carried by the southeast jet on the north side of typhoon "Fireworks", the others comes from South China Sea carried by the southeast airflow on the north side of typhoon "Chapaca". Precipitation and water vapor transport are sensitive to the water vapor content, and small changes of the vapor content lead to the weakness of the intensity of the air flow convergence area in Zhengzhou City and significant reduction of moisture accumulation and precipitation. The airflow convergence zone corresponding to the low-level jet is the main mechanism of the strong vertical upward movement center over Zhengzhou City. After the low-level jet weakened, the convergence of water vapor weakened, precipitation decreased, and the location of precipitation center moved to the southwest. The influence of upper-level jet on precipitation is less than that of low-level jet.
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