Thermodynamic characteristics associated with localized torrential rainfall events in the southwest region of the Korean peninsula

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• 作者：Sueng-Pil Jung ; Tae-Yong Kwon ; Sang-Ok Han…
• 关键词：Localized torrential rainfall ; thermodynamic characteristics ; convective cell life cycle ; radar rainfall ; radiosonde
• 刊名：Asia-Pacific Journal of Atmospheric Sciences
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：51
• 期：3
• 页码：229-237
• 全文大小：1,181 KB
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• 作者单位：Sueng-Pil Jung (1) (2)
  Tae-Yong Kwon (2)
  Sang-Ok Han (1)
  Jong-Hyeok Jeong (1)
  JaeKwan Shim (1)
  Byoung-Choel Choi (1)
  
  1. High-impact Weather Research Center, Observation Research Division, National Institute of Meteorological Research, KMA, Gangneung, Korea
  2. Department of Atmospheric and Environmental Sciences, Gangneung-Wonju National University, 7 Jukheon-gil, Gangneung-si, Gangwon-do, 210-702, Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Meteorology and Climatology
  
• 出版者：Korean Meteorological Society, co-published with Springer
• ISSN：1976-7951

文摘

This study uses observational data from radar and radiosonde to investigate the thermodynamic conditions related to localized torrential rainfall (LTR) in the southwest region of the Korean peninsula. Three criteria were defined for selecting LTR events: 1) hourly rainfall exceeding 30 mm h? recorded at any of the automated synoptic observing systems (ASOS) around Gwangju, 2) an area of rainfall at > 1 mm h? (as estimated from radar rain rate) of less than 20,000 km2, and 3) clearly defined stages of genesis and dissipation in a group of rain cells (> 10 mm h?) with a duration lasting less than 24 hours. As a result, 10 cases were selected from the summer season (June-August) over the last decade (2004-2013). Results showed all cases occurred during the afternoon hours and that the duration and maximum rain area of convective cells (> 30 mm h?) was less than 6 hours and smaller than 700 km2, respectively. The majority of cases showed the following thermodynamic characteristics: 1) strong convective available potential energy (CAPE > 1,500 J kg?) related to surface heating, 2) weak (or no) convective inhibition (CIN < 50 J kg?), 3) adequate moisture and total precipitable water (TPW ?55 mm), and 4) values of storm relative helicity (SRH) of less than 10 m2 s?. The area of rainfall (700 km2) and the duration (6 h) in this experiment were relatively small and short, respectively, compared to those in a previous study in the middle-west region of Korea (1,000 km2, 9 h), but a higher CAPE (1,500 J kg?) and lower SRH (10 m2 s?) were involved in this study than in the former (800 J kg?, 120 m2 s?). Key words Localized torrential rainfall thermodynamic characteristics convective cell life cycle radar rainfall radiosonde