한반도 중서부 국지성 집중호우와 관련된 열역학적 특성 (Thermodynamic Characteristics Associated with Localized Torrential Rainfall Events in the Middle West Region of Korean Peninsula)

서지정보

· 발행기관 : 한국기상학회
· 수록지 정보 : 대기 / 24권 / 4호 / 457 ~ 470페이지
· 저자명 : 정승필, 권태영, 한상옥

초록

Thermodynamic conditions related with localized torrential rainfall in the middlewest region of Korean peninsula are examined using radar rain rate and radiosonde observationaldata. Localized torrential rainfall events in this study are defined by three criteria base on1) any one of Automated Synoptic Observing System (ASOS) hourly rainfall exceeds30 mmhr−1 around Osan, 2) the rain (> 1 mmhr−1) area estimated from radar reflectivity is lessthan 20,000 km2, and 3) the rain (> 10 mmhr−1) cell is detected clearly and duration is shortthan 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 rainrate of convective cells (> 30 mmhr−1) are less than 9hr, smaller than 1,000 km2, and 15,000~60,000 m3s−1 in these cases. And a majority of cases shows the following thermodynamic characteristics:1) Convective Available Potential Energy (CAPE) > 800 Jkg−1, 2) Convective Inhibition(CIN) < 40 Jkg−1, 3) Total Precipitable Water (TPW) ≈ 55 mm, and 4) Storm RelativeHelicity (SRH) < 120 m2s−2. These cases mostly occurred in the afternoon. These thermodynamicconditions indicated that these cases were caused by strong atmospheric instability, liftingto overcome CIN, and sufficient moisture. The localized torrential rainfall occurred withdeep moisture convection result from the instability caused by convective heating.

영어초록

Thermodynamic conditions related with localized torrential rainfall in the middlewest region of Korean peninsula are examined using radar rain rate and radiosonde observationaldata. Localized torrential rainfall events in this study are defined by three criteria base on1) any one of Automated Synoptic Observing System (ASOS) hourly rainfall exceeds30 mmhr−1 around Osan, 2) the rain (> 1 mmhr−1) area estimated from radar reflectivity is lessthan 20,000 km2, and 3) the rain (> 10 mmhr−1) cell is detected clearly and duration is shortthan 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 rainrate of convective cells (> 30 mmhr−1) are less than 9hr, smaller than 1,000 km2, and 15,000~60,000 m3s−1 in these cases. And a majority of cases shows the following thermodynamic characteristics:1) Convective Available Potential Energy (CAPE) > 800 Jkg−1, 2) Convective Inhibition(CIN) < 40 Jkg−1, 3) Total Precipitable Water (TPW) ≈ 55 mm, and 4) Storm RelativeHelicity (SRH) < 120 m2s−2. These cases mostly occurred in the afternoon. These thermodynamicconditions indicated that these cases were caused by strong atmospheric instability, liftingto overcome CIN, and sufficient moisture. The localized torrential rainfall occurred withdeep moisture convection result from the instability caused by convective heating.

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