Dual-Doppler radar analysis of a near-shore line-shaped convective system on 27 July 2011, Korea: A case study

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题名:	Dual-Doppler radar analysis of a near-shore line-shaped convective system on 27 July 2011, Korea: A case study
作者:	廖宇慶;Lee, Jung-Tae;Lee, Dong-In;You, Cheol-Hwan;Uyeda, Hiroshi;Liou, Yu-Chieng;Han, In-Seong
贡献者:	地球科學學院大氣科學學系
关键词:	back-building;Convergence;Doppler radar;Dynamic Meteorology;Physical Oceanography;back-building;Dynamical systems;Dynamics;Environmental conditions;Floods;GC1-1581;Landslides;Landslides & mudslides;line-shaped convective system;Low level;low-level convergence;Marine;Meteorology;Meteorology. Climatology;Metropolitan areas;nearshore;Oceanography;Offshore;Offshore engineering;Precipitation;Precipitation (meteorological);QC851-999;Radar;Rain;Rainfall;Rainy season;Severe weather;Wind
日期:	2014-01-01
上传时间:	2026-04-21 13:49:30 (UTC+8)
出版者:	Taylor and Francis Ltd.;Stockholm: Stockholm University Press
摘要:	摘要： In the summer rainy season, the Korean Peninsula is frequently influenced by severe weather phenomena such as floods and rain-induced landslides. A band-shaped precipitation system associated with unstable atmospheric conditions occurred over northwest Korea on 27 July 2011. This precipitation system produced heavy rainfall over the Seoul metropolitan area, which received over 80 mm h−1 of rainfall and suffered 70 weather-related fatalities. To investigate the precipitation system, we used diverse meteorological data of environmental condition and estimated three-dimensional wind field from dual-Doppler radar measurements of vertical air motion. Environmental conditions included high equivalent potential temperature (θe) of over 355 K at low levels, and low θe of under 330 K at middle levels, causing vertical instability. Furthermore, a pressure trough was located to the northwest of Korea, favouring the development of the band-shaped precipitation system. The tip of the band-shaped precipitation system was made up of line-shaped convective systems (LSCSs) that caused flooding and landslides, and the LSCSs were continuously enhanced by merging between new cells and the pre-existing cell. The position of merging moved from the coast to offshore areas and influenced the positioning of the regions of enhanced convection. In turn, this affected the roughness of the convective cell and the internal structure of the enhanced convective regions. Onshore, the convective area was higher than in offshore areas because of strong convergence (≤−4×10−4 s−1) at low levels caused by friction over land. The strong convergence generated strong updraft (≥4 m s−1) that influenced the height of the convective area. The convective region offshore was wider than that onshore because of weak convergence (≥−2.2×10−4 s−1) at low levels. Updraft in offshore areas was weak (≤3 m s−1) compared with onshore, resulting in a lower and wider convective area. Spatial variations in surface roughness result in different structural features and profiles of divergence within LSCSs, even if they originate in the same convective region. 出版者： Stockholm: Stockholm University Press 出版日期： 2014-01-01 出處： Tellus A: Dynamic Meteorology and Oceanography, 2014-01, Vol.66 (1), p.23453--15 資源來源： Taylor & Francis Journals Auto-Holdings Collection 版權： 2014 J.-T. Lee et al. 2014 版權： Copyright Co-Action Publishing 2014 識別號： ISSN: 1600-0870 識別號： ISSN: 0280-6495 識別號： EISSN: 1600-0870 識別號： DOI: 10.3402/tellusa.v66.23453
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