The intraseasonal oscillations of precipitation and circulations from January to March in 2010 in East Asia

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• 作者：Suxiang Yao (1)
  Qian Huang (1)
  Tim Li (1) (2)
  Chunying Zhang (1)
  
• 刊名：Meteorology and Atmospheric Physics
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：123
• 期：1-2
• 页码：67-79
• 全文大小：1,615 KB
• 作者单位：Suxiang Yao (1)
  Qian Huang (1)
  Tim Li (1) (2)
  Chunying Zhang (1)
  
  1. Key Laboratory of Meteorological Disaster (Nanjing University of Information Science and Technology), Ministry of Education, Nanjing, 210044, China
  2. International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honululu, HI, USA
  
• ISSN：1436-5065

文摘

The rainfall from January to March in 2010 in East Asia is positive anomaly and the temporal evolution characteristics present the cycle of 20-0?days. In the present paper, the low-frequency circulations and its formation mechanism are analyzed. The results show that during the peak rainfall phase, the upstream of the rainfall regions is controlled by low-frequency cyclone, and the downstream is controlled by low-frequency anticyclone in the middle and low troposphere. In the upper troposphere, the westerly jet presents the oscillation characteristics between the north and the south. Both the integrated (from the surface to 100?hPa) diabatic heating and the horizontal vorticity advection contribute to the vertical velocity. In addition, the vorticity vertical advection has effects on the vertical speed, which is a self-feedback process. The latent heating in the precipitation has influences on the westerly jet in the upper troposphere. The interactions between the precipitation and the westerly jet are mainly manifested as the intraseasonal oscillations.