DOI: 10.1175/JCLI-D-15-0175.1
Scopus记录号: 2-s2.0-84957837421
论文题名: Composite analysis of long-lived mesoscale vortices over the middle reaches of the Yangtze River valley: Octant features and evolution mechanisms
作者: Fu S.-M. ; Zhang J.-P. ; Sun J.-H. ; Zhao T.-B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 2 起始页码: 761
结束页码: 781
语种: 英语
Scopus关键词: Budget control
; Climatology
; Energy conversion
; Kinetic energy
; Kinetics
; Composite analysis
; Evolution mechanism
; Latent heat release
; Lower troposphere
; Mesocyclones
; Mesoscale vortices
; Three dimensional geometry
; Torrential rainfalls
; Vortex flow
; baroclinic mode
; climatology
; cyclone
; mesoscale meteorology
; rainfall
; troposphere
; vortex flow
; weather forecasting
; China
; Dabie Mountains
; Yangtze Valley
英文摘要: A14-yr climatology is presented of themesoscale vortices generated in the vicinity of the DabieMountains [Dabie vortices (DBVs)] in the YangtzeRiver valley. Analyzing these vortices using the Climate Forecast SystemReanalysis (CFSR), DBVs were found to be a frequent type of summer mesoscale weather system, with a mean monthly frequency of 12.2. DBVs were mainly located in the middle and lower troposphere, and ~92% of them triggered precipitation. MostDBVswere short lived, and only 19.5% persisted for more than 12 h. Latent heat release associated with precipitation is a dominant factor for the DBV's three-dimensional geometry features, life span, and intensity. The long-lived DBVs, all of which triggered torrential rainfall, were analyzed using a composite analysis under the normalized polar coordinates. Results indicate that these vortices generally moved eastward and northeastward, which corresponded to the vortices' orientation, divergence, vorticity budget, and kinetic energy budget. The evolution of long-lived DBVs featured significant unevenness: Those octants located at the front and on the right side of the vortices'moving tracks weremore favorable for their development andmaintenance, while those octants located at the back and on the left side acted conversely. Convergence-related shrinking was the most favorable factor for the vortices' development and persistence, while the tilting effect was a dominant factor accounting for their attenuation. Long-lived DBVs featured strong baroclinity, and the baroclinic energy conversion acted as the main energy source for the vortices' evolution. In contrast, the barotropic energy conversion favored the vortices' development and maintenance at first, and later triggered their dissipation. © 2016 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50082
Appears in Collections: 气候变化事实与影响
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作者单位: International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Institute of Heavy Rain, China Meteorological Administration, Wuhan, China; Liaoning Meteorology Bureau, China Meteorological Administration Training Center, Liaoning Branch, Shenyang, China; Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Regional Climate-Environment Research for East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Fu S.-M.,Zhang J.-P.,Sun J.-H.,et al. Composite analysis of long-lived mesoscale vortices over the middle reaches of the Yangtze River valley: Octant features and evolution mechanisms[J]. Journal of Climate,2016-01-01,29(2)