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Advances in Atmospheric Sciences

, Volume 20, Issue 4, pp 612–622 | Cite as

Initialization and simulation of a typhoon using 4-dimensional variational data assimilation — Research on typhoon Herb (1996)

  • Zhang Xiaoyan
  • Wang Bin
  • Ji Zhongzhen
  • Qingnong Xiao
  • Zhang Xin
Article

Abstract

The MM5 and its four dimensional variational data assimilation (4D-Var) system are used in this paper. Based on the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data, the authors generate an optimal initial condition for a typhoon by using the bogus data assimilation (BDA) scheme. BDA is able to recover many of the structural features of typhoons including a warm-core vertex, the correct center position, and the strong circulation. As a result of BDA using a bogus surface low, dramatic improvement is achieved in the 72 h prediction of typhoon Herb. Through several cases, the initialization by BDA effectively generates the harmonious inner structure of the typhoon, but which is lacking in the original analysis field. Therefore the intensity forecast is improved greatly. Some improvements are made in the track forecast, but more work still needs to be done.

Key words

variational data assimilation bogus scheme BDA Typhoon Herb numerical simulation 

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Copyright information

© Advances in Atmospheric Sciences 2003

Authors and Affiliations

  • Zhang Xiaoyan
    • 1
  • Wang Bin
    • 2
  • Ji Zhongzhen
    • 1
  • Qingnong Xiao
    • 2
  • Zhang Xin
    • 1
  1. 1.LASG, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing
  2. 2.Mesoscale and Microscale MeteorologyNational Center for Atmospheric ResearchBoulderUSA

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