Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Tests and analysis of digital filter weak constrain in data assimilation

Li Yi Wang Shu-Chang Zhang Wei-Min Zhao Jun Cao Xiao-Qun

Tests and analysis of digital filter weak constrain in data assimilation

Li Yi, Wang Shu-Chang, Zhang Wei-Min, Zhao Jun, Cao Xiao-Qun
PDF
Get Citation
Metrics
  • Abstract views:  2800
  • PDF Downloads:  625
  • Cited By: 0
Publishing process
  • Received Date:  27 July 2010
  • Accepted Date:  15 December 2010
  • Published Online:  15 September 2011

Tests and analysis of digital filter weak constrain in data assimilation

  • 1. (1)Institute of Meteorology, People’s Liberation Army University of Science and Technology, Nanjing 211101, China; (2)School of Computer Science, National University of Defense Technology, Changsha 410073, China

Abstract: Variational data assimilation is an advanced technique to provide correct and high quality initial fields for the numerical model. Digital filter is not restricted to initialization; it may also be implemented as a weak constraint penalizing the analysis towards a balanced state in a preoperational 4D-Var system. The constraint is imposed only on the analysis increments to damp spurious fast oscillations associated with gravity–inertia waves. The influence of DFI as a weak constraint on 4D-Var forecast is assessed by assimilation experiments with the recently occurring severe snow weather. It is shown that the weak constraint imposed only on the increments manages to control efficiently the emergence of fast oscillations in the resulting forecast while maintaining a closer fitting to the observations.

Reference (15)

Catalog

    /

    返回文章
    返回