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Korean Meteorological Society (한국기상학회)
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Analysis of An Outflow Boundary Induced Heavy Rainfall That Occurred in the Seoul Metropolitan Area

수도권에서 유출류 경계(Outflow Boundary)를 따라 발생한 집중호우 분석

  • Lee, Ji-Won (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Min, Ki-Hong (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
  • 이지원 (경북대학교 천문대기과학과) ;
  • 민기홍 (경북대학교 천문대기과학과)
  • Received : 2017.09.12
  • Accepted : 2017.12.13
  • Published : 2017.12.31
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Abstract

In Korea, property and human damages occur annually due to heavy precipitation during the summer. On August 8, 2015, heavy rainfall occurred in the Seoul metropolitan area due to an outflow boundary, and $77mmhr^{-1}$ rainfall was recorded in Gwangju, Gyeonggi Province. In this study, the simulation of the WRF numerical model is performed to understand the cause and characteristics of heavy rainfall using the Conditional Instability of the Second Kind (CISK), potential vorticity (PV), frontogenesis function, and convective available potential energy (CAPE) analyses, etc. Convective cells initiated over the Shandong Peninsula and located on the downwind side of an upper level trough. Large amounts of water vapor were supplied to the Shandong Peninsula along the southwestern edge of a high pressure system, and from the remnants of typhoon Soudelor. The mesoscale convective system (MCS) developed through CISK process and moved over to the Yellow Sea. The outflow boundary from the MCS progressed east and pushed cold pool eastward. The warm and humid air over the Korean Peninsula further enhanced convective development. As a result, a new MCS developed rapidly over land. Because of the latent heat release due to convection and precipitation, strong potential vorticity was generated in the lower atmosphere. The rapid development of MCS and the heavy rainfall occurred in an area where the CAPE value was greater than $1300Jkg^{-1}$ and the fronto-genesis function value of 1.5 or greater coincided. The analysis result shows that the MCS driven by an outflow boundary can be identified using CISK process.

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References

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