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Climatology and Structures of Southwest Vortices in the NCEP Climate Forecast System Reanalysis
Feng, Xinyuan1; Liu, Changhai2; Fan, Guangzhou1; Liu, Xiaodong3; Feng, Caiyun1
Source PublicationJOURNAL OF CLIMATE
AbstractThe southwest vortex (SWV) is a meso-a-scale cyclonic low pressure system originating in southwest China. It is a high-impact precipitation-generating weather system in this region and a large downstream area. A climatology of the SWV over 1979-2010 is presented here. Results indicate that the SWV is a common regional weather system with about 73 annual occurrences. Two primary genesis regions are identified, one in the Sichuan basin and another one in the southeast flank of the Tibetan Plateau. SWV genesis displays seasonality with a spring-summer preference and diurnal variations. The average life cycle, horizontal dimension, and translation speed are 15.1 h, 435 km, and 8.6 m s(-1), respectively. SWVs are classified into four types that show regional and seasonal contrasts in structure. In type I, the winter-spring elevated dry vortex in the basin is vertically confined to a shallow layer between 850 and 600 hPa and tilts northeastward. The low-level vortex has a cold center, and the middle to upper levels feature baroclinicity. In type II, the nighttime warm-season precipitating vortex system in the basin has a deep structure with the cyclonic vorticity extending from the surface into the upper troposphere. The nonsevere precipitating vortex (type IIa) is weakly baroclinic and tilts northward with height, whereas the severe precipitating vortex (type IIb) is vertically aligned. For type III, in the southern mountains, the shallow surface-based vortex develops in a well-mixed boundary layer and vertically tilts in the upslope direction and has a warm and lowhumidity core. For type IV, the heavy precipitating vortex in the mountainous region is large, deep, and nearly upright with a fairly barotropic environment.
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000386205900007
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chengdu Univ Informat Technol, Coll Atmospher Sci, Plateau Atmosphere & Environm Key Lab Sichuan Pro, Chengdu, Peoples R China
2.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA
3.Chinese Acad Sci, Inst Earth Environm, Xian, Peoples R China
Recommended Citation
GB/T 7714
Feng, Xinyuan,Liu, Changhai,Fan, Guangzhou,et al. Climatology and Structures of Southwest Vortices in the NCEP Climate Forecast System Reanalysis[J]. JOURNAL OF CLIMATE,2016,29(21):7675-7701.
APA Feng, Xinyuan,Liu, Changhai,Fan, Guangzhou,Liu, Xiaodong,&Feng, Caiyun.(2016).Climatology and Structures of Southwest Vortices in the NCEP Climate Forecast System Reanalysis.JOURNAL OF CLIMATE,29(21),7675-7701.
MLA Feng, Xinyuan,et al."Climatology and Structures of Southwest Vortices in the NCEP Climate Forecast System Reanalysis".JOURNAL OF CLIMATE 29.21(2016):7675-7701.
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