대기 (Atmosphere)

  • 제23권3호
  • /
  • Pages.331-346
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  • 2013
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  • 1598-3560(pISSN)
  • /
  • 2288-3266(eISSN)
한국기상학회 (Korean Meteorological Society)
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대류권계면 접힘에 의한 중규모 강설 발달에 대한 사례 연구

A Case Study of Mesoscale Snowfall Development Associated with Tropopause Folding

  • 김진연 (기상청관측기반국국가태풍센터) ;
  • 민기홍 (경북대학교대기원격탐사연구소) ;
  • 김경익 (경북대학교천문대기과학과) ;
  • 이규원 (경북대학교천문대기과학과)
  • Kim, Jinyeon (Korea Meteorological Administration, National Typhoon Center) ;
  • Min, Ki-Hong (Center for Atmospheric Remote Sensing, Kyungpook National University) ;
  • Kim, Kyung-Eak (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Lee, Gyuwon (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
  • 투고 : 2013.07.01
  • 심사 : 2013.08.05
  • 발행 : 2013.09.30
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초록

A case study of mesoscale snowfall with polar low signature during 25~26 December 2010 in South Korea is presented. The data used for analysis include surface and upper level weather charts, rain gauge, sea surface temperature, satellite imagery, sounding, and global $1^{\circ}{\times}1^{\circ}$ reanalysis data. The system initiated with a surface trough near the bay of Bohai but quickly intensified to become a polar low within 12 hours. The polar low moved southeastward bringing snowfall to southwestern Korea. There was strong instability layer beneath 800 hPa but baroclinicty was weak and disappeared as the low progressed onto land. Shortwave at 500 hPa and the surface trough became in-phase which hindered the development of the polar low while it approached Korea. However, there were strong tropopause folding (~500 hPa) and high potential vorticity (PV), which allowed the system to maintain its structure and dump 20.3 cm of snow in Jeonju. Synoptic, thermodynamic, dynamic, and moisture analyses reveal that polar low developed in an area of baroclinicity with strong conditional instability and warm air advection at the lower levels. Further, the development of a surface trough to polar low was aided by tropopause folding with PV advection in the upper level, shortwave trough at 500 hPa, and moisture advection with low-level jet (LLJ) of 15 m $s^{-1}$ or more at 850 hPa. Maximum snowfall was concentrated in this region with convection being sustained by latent heat release.

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