气候变化领域集成服务门户(CCPortal): VDRAS and Polarimetric Radar Investigation of a Bow Echo Formation After a Squall Line Merged With a Preline Convective Cell

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DOI	10.1029/2019JD031719
	VDRAS and Polarimetric Radar Investigation of a Bow Echo Formation After a Squall Line Merged With a Preline Convective Cell
	Zhou A.; Zhao K.; Lee W.-C.; Huang H.; Hu D.; Fu P.
发表日期	2020
ISSN	2169897X
卷号	125 期号:7
英文摘要	This paper is the first to document the development of a type of bow echo, termed merger-formation bow echo (MFBE), in southeast China evolving from a subtropical squall line (SL) merging with a preline convective cell (CC). Although this MFBE did not produce damaging surface winds, its intense rain rate resulted in local flooding. The evolution of the kinematic, thermodynamic, and microphysical structures is investigated using the variational Doppler radar analysis system (VDRAS) analysis and polarimetric radar observations. Key factors of this MFBE event including the rear-inflow jet (RIJ) and cold pool exhibited different characteristics from those in classical bow echoes and limited MFBE cases. As the SL propagated towards the coast, a CC was triggered along a sea breeze front. The SL did possess a RIJ, but a bow-shaped reflectivity did not appear until the SL-CC merger. The RIJ weakened and became elevated during the merger, while the leading edge of SL cold pool accompanied by a weak diverging outflow did not advance with the reflectivity field. The updraft was strengthened due to the merger, resulting in enhanced precipitation falling ahead of the original SL. The subcloud evaporation locally cooled the air ahead of the SL and merged with the original SL cold pool. This combined cold pool advanced forward rapidly and caught up with the bowing radar reflectivity to form this MFBE. This study illustrates the processes of a SL-CC merger leading to the formation of a different type of MFBE that did not produce damaging surface winds. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	bow echo; convective merge; microphysical processes; polarimetric radar; VDRAS
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186080
作者单位	Key Laboratory of Mesoscale Severe Weather/MOE and School of Atmospheric Sciences, Nanjing University, Nanjing, China; State Key Laboratory of Severe Weather and Joint Center for Atmospheric Radar Research of CMA/NJU, Beijing, China; Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Guangzhou Central Meteorological Observatory, Guangzhou, China
推荐引用方式 GB/T 7714	Zhou A.,Zhao K.,Lee W.-C.,et al. VDRAS and Polarimetric Radar Investigation of a Bow Echo Formation After a Squall Line Merged With a Preline Convective Cell[J],2020,125(7).
APA	Zhou A.,Zhao K.,Lee W.-C.,Huang H.,Hu D.,&Fu P..(2020).VDRAS and Polarimetric Radar Investigation of a Bow Echo Formation After a Squall Line Merged With a Preline Convective Cell.Journal of Geophysical Research: Atmospheres,125(7).
MLA	Zhou A.,et al."VDRAS and Polarimetric Radar Investigation of a Bow Echo Formation After a Squall Line Merged With a Preline Convective Cell".Journal of Geophysical Research: Atmospheres 125.7(2020).