双月刊

ISSN 1006-9895

CN 11-1768/O4

吉林一次极端降水发生发展动热力过程的数值模拟分析*
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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.中国科学院大气物理研究所云降水物理与强风暴院重点实验室;3.南京信息工程大学大气科学学院

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国家自然科学基金


Numerical Simulation Analysis on the Generation and Evolution of the Dynamic and Thermodynamic Processes of an Extreme Rainfall in Jilin Province
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School of Atmospheric Sciences of Nanjing University of Information Science & Technology

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    摘要:

    利用ERA-Interim再分析资料、常规气象观测资料、CMORPH融合降水资料以及WRF高分辨率数值模拟结果,对2017年7月13日-14日吉林地区的极端降水天气过程的环流背景和触发机制进行了分析。结果表明:(1)东北冷涡环流控制下,副高北抬与中纬度锋区形成了有利的大尺度环流背景。降水发生在冷涡底部与副高之间的平直纬向环流中,东北冷涡南部的低槽、低空切变线、高低空急流是影响此次降水的重要天气系统;(2)在高层辐散低层辐合的有利动力条件下,极端的水汽输送与吉林地区西低东高地形的阻挡和强迫抬升是极端降水产生的重要原因;(3)中高层有干冷空气入侵,伴随高空动量下传至低空,加强了低空急流发展,低空急流发展至地面附近产生超低空急流后,加强了上升运动。南北经向动量输送交汇加强了低层风辐合切变,切变线上对流发展配合小地形抬升,导致永吉县产生极端降水。

    Abstract:

    The analysis of circulation background and trigger mechanism of an extreme precipitation weather process in Jilin area on July 13-14, 2017 was conducted by using the ERA-Interim reanalysis data , conventional meteorological observation data, CMORPH fusion precipitation data and high-resolution numerical simulation results of WRF. The results are as follows. (1) The northward movement of the subtropical high and the cold vortex over Northeast China and mid-latitude front zone are the large-scale circulation background of precipitation. Precipitation occurs in the straight zonal circulation between the bottom of the cold vortex and the subtropical high. Clod trough, low-level shear line, upper-level jet stream and low-level jet stream are important weather systems affecting precipitation. (2) Under the background of high-level divergence and low-level convergence, extreme water vapor transport and the blocking and forced uplift of the low west and east high terrain in Jilin area are one of the factors that cause extreme precipitation. (3) Dry and cold air intruded into the middle and upper levels, and the high-level momentum transmitted to the low altitude, which strengthened the low-level jet and generating an ultra-low-level jet near surface, resulting in the enhancement of the vertical ascent movement. The intersection of north-south meridional momentum transport strengthens low-level wind convergence shear, and the development of convection on the shear line led to extreme precipitation in Yongji County.

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  • 收稿日期:2020-07-17
  • 最后修改日期:2020-11-24
  • 录用日期:2021-01-05
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