气候变化领域集成服务门户(CCPortal): Characteristics of low-level meso-γ-scale vortices in the warm season over East China

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DOI	10.1016/j.atmosres.2019.104768
	Characteristics of low-level meso-γ-scale vortices in the warm season over East China
	Tang Y.; Xu X.; Xue M.; Tang J.; Wang Y.
发表日期	2020
ISSN	0169-8095
卷号	235
英文摘要	This work firstly studies the radar climatology of low-level meso-γ-scale vortices (MVs) occurred in the warm season of East China. Two kinds of MVs are considered which are, respectively, produced by isolated cells and mesoscale convective systems (MCSs). Results show that MVs most often occur in June and July. For MCS-type MVs, there is a high occurrence frequency in the late afternoon and early evening, while no apparent diurnal variation is found for cell-type ones. Moreover, MCS-type MVs tend to be stronger and longer-lived due to their favorable environment conditions of higher convective available potential energy (CAPE) and larger vertical wind shear. Compared to the supercell MVs in southeastern United States, the cell-type MVs in East China are much weaker and shorter-lived, indicating a lower occurrence frequency of supercells and thus prevailing of low-level MVs in East China than in the United States. The MCS-type MVs in East China mainly form in the developing and mature stages of their parent system which suggests that the cold-pool induced baroclinic vorticity plays a major role in the genesis of MV. This seems to be different from the MVs produced by quasi-linear convective systems (QLCSs) in the United States where frictional vorticity owing to surface drag contributes more significantly to MV genesis. Given their higher damaging potential, tracking of MVs within MCSs based upon the linear, least squares derivatives (LLSD) azimuthal shear used in this work would be helpful for the operational warning and forecasting of severe convective weather in East China. © 2019 Elsevier B.V.
英文关键词	Convective systems; East China; Meso-γ-scale vortices; Radar climatology
学科领域	Climatology; Potential energy; Radar; Vortex flow; Vorticity; Convective available potential energies; Convective systems; East China; Environment conditions; Mesoscale Convective System; Operational warnings; Quasi-linear convective systems; Vertical wind shear; Storms; climatology; convective system; environmental conditions; mesoscale meteorology; potential energy; radar; vortex; vorticity; wind shear; China; United States
语种	英语
scopus关键词	Climatology; Potential energy; Radar; Vortex flow; Vorticity; Convective available potential energies; Convective systems; East China; Environment conditions; Mesoscale Convective System; Operational warnings; Quasi-linear convective systems; Vertical wind shear; Storms; climatology; convective system; environmental conditions; mesoscale meteorology; potential energy; radar; vortex; vorticity; wind shear; China; United States
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120497
作者单位	Key Laboratory of Mesoscale Severe Weather, Ministry of Education, and School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu 210023, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Center for Analysis and Prediction of Storms, School of Meteorology, University of Oklahoma, Norman, OK 73072, United States; Shenzhen Meteorology Bureau, Shenzhen, Guangdong 518040, China
推荐引用方式 GB/T 7714	Tang Y.,Xu X.,Xue M.,et al. Characteristics of low-level meso-γ-scale vortices in the warm season over East China[J],2020,235.
APA	Tang Y.,Xu X.,Xue M.,Tang J.,&Wang Y..(2020).Characteristics of low-level meso-γ-scale vortices in the warm season over East China.Atmospheric Research,235.
MLA	Tang Y.,et al."Characteristics of low-level meso-γ-scale vortices in the warm season over East China".Atmospheric Research 235(2020).