Observation and numerical simulation of a squall line over South China

ZOU Wantong; LI Jiangnan; PAN Xinshun; CAO Zheng

doi:10.13471/j.cnki.acta.snus.2022D013

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Observation and numerical simulation of a squall line over South China

Research articles | 更新时间：2024-01-25

- Observation and numerical simulation of a squall line over South China
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 63, Issue 1, Pages: 24-33(2024)
- 作者机构：
  
  1.中山大学大气科学学院 / 广东省气候变化与自然灾害研究重点试验室，广东珠海 519082
  2.中国民用航空中南地区空中交通管理局，广东广州 510403
  3.南方海洋科学与工程广东省实验室（珠海），广东珠海 519082
  4.广东省佛山市南海区气象局，广东佛山 528200
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2022D013
  CLC： P458.3
- Published：25 January 2024，
  
  Published Online：18 December 2023，
  
  Received：06 January 2022，
  
  Accepted：10 March 2022
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邹宛彤,李江南,潘心顺等.一次华南飑线的观测分析和数值模拟研究[J].中山大学学报(自然科学版)(中英文),2024,63(01):24-33.

ZOU Wantong,LI Jiangnan,PAN Xinshun,et al.Observation and numerical simulation of a squall line over South China[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(01):24-33.
邹宛彤,李江南,潘心顺等.一次华南飑线的观测分析和数值模拟研究[J].中山大学学报(自然科学版)(中英文),2024,63(01):24-33. DOI： 10.13471/j.cnki.acta.snus.2022D013.

ZOU Wantong,LI Jiangnan,PAN Xinshun,et al.Observation and numerical simulation of a squall line over South China[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(01):24-33. DOI： 10.13471/j.cnki.acta.snus.2022D013.

摘要

利用多种气象观测资料和高分辨率的数值模拟结果，对2020年5月11日华南地区一次飑线的初生、增强、成熟和衰亡等4个阶段的对流组织特征和模态的演变及机理进行了分析。结果表明：该飑线发生于高空急流入口右侧的高空辐散区，伴随着南支槽的加深东移，低层暖湿平流以及地面的中尺度辐合线为其提供了有利的水汽、热力和抬升触发条件。初始阶段，飑线呈断线型发展，在较大的环境热力条件下具有中到强的对流有效位能和最大的对流抑制。成熟期形成拖尾层状云型飑线，低层风切变和冷池强度逐渐达到平衡状态。在衰亡阶段，飑线的组织模态发生转变，其中环境热力条件是后向新生型对流单体发生的主要原因，且低层不同的水汽和风切变条件也对模态的变异存在一定作用。在华南地区，以断线型模态生成拖尾层状云型模态的飑线所需的对流有效位能更高，且飑线的维持也需要更强的热力条件。对流有效位能、对流抑制能量、粗理查森数、风暴相对螺旋度等在对流单体形成的种类和组织模态方面均有一定的指示意义。

Abstract

Based on meteorological observation data and high-resolution numerical simulation results

the evolution and mechanism of convective organization and modes in a squall line over South China on May 11

2020

were analyzed in four stages: nascent stage

enhanced stage

mature stage

and decay stage. The results show that the squall line occurred in the strong divergence zone of the upper jet stream. With the deepening and eastward moving of the south branch of the trough

the warm and wet advection in the low layer and mesoscale convergence line on the ground provided favorable conditions of water vapor

heat

and uplift triggering. In the nascent stage

the squall developed in a manner of Broken Lines with medium to strong convective available potential energy and maximum convective inhibition

in the environment of the maximum thermal condition. In the mature stage

a trailing stratiform squall was formed

and the low-level wind shear and cold pool intensity gradually reached a balanced state. During the decay stage

the phase mode of the squall line changed

mainly affected by the thermal condition caused Back Building mode convective cells

and also by different water vapor and wind shear conditions in the lower layer. In South China

it requires high convective effective potential energy to generate a squall line of stratiform cloud mode with trailing tail strong thermal conditions to maintain the squall line. The convective available potential energy

convective inhibition

Bulk Richardson number

and storm-relative helicity can indicate the type and structure mode of convective monomer formation.

关键词

华南飑线数值模拟组织模态后向新生型

Keywords

South China squall linenumerical simulationorganizational modeBack-Building mode

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