Advances in Atmospheric Sciences

, Volume 36, Issue 12, pp 1327–1339 | Cite as

Analysis of Determinants for an Enhanced and Long-lasting Coastal Convective System by Means of a Case Study (26 July 2011)

  • Jung-Tae Lee
  • Dong-In LeeEmail author
  • Shingo Shimizu
  • Cheol-Hwan You
Original Paper


A precipitation system developed continuously along the western coastline of the Korean Peninsula and created considerable precipitation both along the coast and inland on 26 July 2011. In this study, the causes for this nearshore convective system are investigated from observations and the results of model experiments. Three-dimensional radar fields clearly show that a change of wind at the surface border played an important role in the development of the nearshore convection system. The simulation results, which are very similar to the observations, show that the surface border generated and maintained the convergence zone. The roughness change enhanced the convergence, and the interaction between the deepening cold pool and downward flow maintained the convergence zone. The surface mechanical discontinuity affected by the roughness change between sea and land formed the convergence (gradient of wind stress), which induced momentum transfer to the upper layer. The cold pool created a steep gradient of potential temperature and provided the reason for the propagated convergence zone with the downward flow. The maximum value of the surface change factor, which comprises the influencing factors for the long-lasting convective system, reflects the enhancement of the system at the coast.

Key words

coastal precipitation roughness convergence zone cold pool propagation downward flow 

摘 要

2011 年 7 月 26 日, 一次降水系统沿着朝鲜半岛西部海岸线持续发展, 并在沿海和内陆地区造成强降水. 本研究中, 通过观测和数值试验结果探讨了这种近岸对流系统的成因. 三维雷达风场清晰地表明, 在近岸对流系统的发展过程中, 海陆边界近地面风场的变化起了重要作用. 模拟结果与观测结果非常相似, 表明海陆边界产生并维持了辐合区. 粗糙度的变化增强了辐合, 并且加深的冷池与下沉气流的相互作用有利于辐合区的维持. 受海陆粗糙度变化影响的表面机械不连续性形成了辐合 (风应力梯度), 引起动量传递到上层. 冷池产生了明显的位温梯度, 并解释了辐合区和下沉气流的传播. 表面变化因子的极大值, 包括持续性对流系统的影响因子, 反映了对流系统在海岸处的增强。


沿海降水 粗糙度 辐合区 冷池传播 下沉气流 


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This research was funded by the Korea Meteorological Institute (Grant No. KMI 2018-05410).


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Copyright information

© Institute of Atmospheric Physics/Chinese Academy of Sciences, and Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jung-Tae Lee
    • 1
    • 2
  • Dong-In Lee
    • 2
    Email author
  • Shingo Shimizu
    • 3
  • Cheol-Hwan You
    • 2
  1. 1.New and Renewable Energy Resource CenterKorea Institute of Energy ResearchDaejeonRepublic of Korea
  2. 2.Department of Environmental Atmospheric SciencePukyong National UniversityBusanRepublic of Korea
  3. 3.Storm, Flood, and Landslide Research DepartmentNational Research Institute for Earth Science and Disaster ResilienceTsukubaJapan

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