郑州“7·20”极端暴雨的水汽输送特征
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于腾飞,男,硕士研究生,主要从事极端降水方面的研究,ytf@stu.ouc.edu.cn。

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P458.121.1;P426

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国家重点研发计划项目(2019YFA0607002)


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Analysis on water vapor transport characteristics of “7·20” extreme rainstorm in Zhengzhou
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    摘要:

    在亚洲中高纬度“两槽一脊”的稳定环流形势下,西北太平洋副热带高压和台风“烟花”“查帕卡”等共同作用,引导水汽在郑州地区辐合,导致2021年7月19—21日郑州地区出现降水极值超过800 mm的罕见极端暴雨(以下简称为“郑州“7·20”极端暴雨”),造成重大人员伤亡和财产损失。针对此次郑州“7·20”极端暴雨过程,采用HYSPLIT模式追踪其水汽来源和输送特征。结果表明:郑州“7·20”极端暴雨的水汽主要来自北太平洋西部和南海北部,北太平洋西部的水汽受西北太平洋副热带高压和台风“烟花”的共同影响,南海北部的水汽受台风“查帕卡”和“烟花”的共同影响。水汽主要在850 hPa以下高度输送,而来自南海北部的水汽在向北输送的过程中逐渐抬升,临近郑州地区时接近700 hPa。基于HYSPLIT后向追踪的水汽轨迹进行定量计算,得到来自北太平洋西部和南海北部的水汽贡献分别约占73%和27%。

    Abstract:

    Under the stable circulation of two troughs and one ridge in middle and high latitudes of Asia, the western North Pacific subtropical high and Typhoon In-fa and Cempaka lead the water vapor to converge in Zhengzhou, resulting in a rare extreme rainstorm with precipitation extremum more than 800 mm there from 19 to 21 July 2021 (hereinafter referred to as “7·20” extreme rainstorm in Zhengzhou), causing heavy casualties and property losses. The HYSPLIT model is used to track the water vapor source and transport characteristics of this extreme rainstorm process. The results show that the water vapor of “7·20” extreme rainstorm in Zhengzhou mainly comes from the west of the North Pacific and the north of the South China Sea, which are affected by the joint action of the western North Pacific subtropical high and Typhoon In-fa and the synergistic effect of Typhoon Cempaka and In-fa, respectively. The water vapor is mainly transported below 850 hPa, while the water vapor from the north of the South China Sea rises gradually in the process of northward transport and is close to 700 hPa near Zhengzhou. Based on the quantitative calculation of the water vapor trajectory by HYSPLIT backward tracking, it is found that the water vapor contributions from the west of the North Pacific and the north of the South China Sea account for about 73% and 27%, respectively.

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于腾飞,李春,石剑.郑州“7·20”极端暴雨的水汽输送特征[J].海洋气象学报,2022,42(3):69-76.

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  • 在线发布日期: 2022-08-30
  • 出版日期: 2022-08-31
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