Observational facts of sustained departure plateau vortexes
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  • 作者:Shuhua Yu ; Wenliang Gao ; Jun Peng
  • 关键词:departure plateau vortex ; sustained activity ; observational facts
  • 刊名:Journal of Meteorological Research
  • 出版年:2014
  • 出版时间:February 2014
  • 年:2014
  • 卷:28
  • 期:2
  • 页码:296-307
  • 全文大小:822 KB
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  • 作者单位:Shuhua Yu (1)
    Wenliang Gao (2)
    Jun Peng (1)
    Yuhua Xiao (3)

    1. The Institute of Plateau Meteorology, CMA, Chengdu, 610072, China
    2. Yaan City Meteorological Bureau, CMA, Yaan, 625000, China
    3. Sichuan Provincial Meteorological Observatory, CMA, Chengdu, 610072, China
  • 刊物类别:Atmospheric Sciences; Meteorology; Geophysics and Environmental Physics; Atmospheric Protection/Air
  • 刊物主题:Atmospheric Sciences; Meteorology; Geophysics and Environmental Physics; Atmospheric Protection/Air Quality Control/Air Pollution;
  • 出版者:The Chinese Meteorological Society
  • ISSN:2198-0934
文摘
By using the twice-daily atmospheric observation data from 1998 to 2012, station rainfall data, Tropical Rainfall Measure Mission (TRMM) data, as well as the plateau vortex and shear line year book, characteristics of the sustained departure plateau vortexes (SDPVs) are analyzed. Some new useful observational facts and understanding are obtained about the SDPV activities. The following results are obtained. (1) The active period of SDPVs is from June to August, most in July, unlike that of the unsustained departure plateau vortexes (UDPVs), which have same occurrence frequencies in the three summer months. (2) The SDPVs, generated mainly in the Qumalai neighborhood and situated in a sheared surrounding, move eastward or northeastward, while the UDPVs are mainly led by the upper-level trough, and move eastward or southeastward. (3) The SDPVs influence wide areas of China, even far to the Korean Peninsula, Japan, and Vietnam. (4) The SDPVs change their intensities and properties on the way to the east. Most of them become stronger and produce downpour or sustained regional rainstorms to the south of Yellow River. (5) The longer the SDPV sustains, the more baroclinity it has. (6) When an SDPV moves into the sea, its central pressure descends and rainfall increases in all probability. (7) An SDPV might spin over the bend of the Yellow River when there exists a tropical cyclone in the East China Sea. It could also move oppositely to a landed tropical low pressure originated from the sea to the east of Taiwan or from the South China Sea. Key words departure plateau vortex sustained activity observational facts

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