대기 (Atmosphere)

  • 제24권4호
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  • Pages.457-470
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  • 2014
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  • 1598-3560(pISSN)
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  • 2288-3266(eISSN)
한국기상학회 (Korean Meteorological Society)
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한반도 중서부 국지성 집중호우와 관련된 열역학적 특성

Thermodynamic Characteristics Associated with Localized Torrential Rainfall Events in the Middle West Region of Korean Peninsula

  • 정승필 (국립기상연구소 예보연구과 재해기상연구센터) ;
  • 권태영 (강릉원주대학교 대기환경과학과) ;
  • 한상옥 (국립기상연구소 예보연구과 재해기상연구센터)
  • Jung, Sueng-Pil (High-impact Weather Research Center, Forecast Research Division, National Institute of Meteorological Research) ;
  • Kwon, Tae-Yong (Department of Atmospheric and Environmental Sciences, Gangneung-Wonju National University) ;
  • Han, Sang-Ok (High-impact Weather Research Center, Forecast Research Division, National Institute of Meteorological Research)
  • 투고 : 2014.06.12
  • 심사 : 2014.09.25
  • 발행 : 2014.12.31
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초록

Thermodynamic conditions related with localized torrential rainfall in the middle west region of Korean peninsula are examined using radar rain rate and radiosonde observational data. Localized torrential rainfall events in this study are defined by three criteria base on 1) any one of Automated Synoptic Observing System (ASOS) hourly rainfall exceeds $30mmhr^{-1}$ around Osan, 2) the rain (> $1mmhr^{-1}$) area estimated from radar reflectivity is less than $20,000km^2$, and 3) the rain (> $10mmhr^{-1}$) cell is detected clearly and duration is short than 24 hr. As a result, 13 cases were selected during the summer season of 10 years (2004-13). It was found that the duration, the maximum rain area, and the maximum volumetric rain rate of convective cells (> $30mmhr^{-1}$) are less than 9hr, smaller than $1,000km^2$, and $15,000{\sim}60,000m^3s^{-1}$ in these cases. And a majority of cases shows the following thermodynamic characteristics: 1) Convective Available Potential Energy (CAPE) > $800Jkg^{-1}$, 2) Convective Inhibition (CIN) < $40Jkg^{-1}$, 3) Total Precipitable Water (TPW) ${\approx}$ 55 mm, and 4) Storm Relative Helicity (SRH) < $120m^2s^{-2}$. These cases mostly occurred in the afternoon. These thermodynamic conditions indicated that these cases were caused by strong atmospheric instability, lifting to overcome CIN, and sufficient moisture. The localized torrential rainfall occurred with deep moisture convection result from the instability caused by convective heating.

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