20th Conference on Weather Analysis and Forecasting/16th Conference on Numerical Weather Prediction


Understanding the Analysis Error Pattern of a 3DVAR System Using Streamfunction and Velocity Potential

Yuanfu Xie, NOAA/ERL/FSL, Boulder, CO

Streamfunction and velocity potential are widely used in 3DVAR systems for mesoscale data assimilation. With proper covariances or recursive filters, these 3DVAR systems provide reasonable analyses for numerical prediction models. However, when they are used to analyze smaller scale motions than a observation network can resolve, these systems may result some interesting error patterns in their incremental fields. In this presentation, theoretical discussion and numerical experiments are provided to understand these error patterns. Alternative approaches are recommended to avoid this kind of error patterns.

extended abstract  Extended Abstract (168K)

Supplementary URL: http://fsl.noaa.gov

Poster Session 1, Monday Posters
Monday, 12 January 2004, 2:30 PM-4:00 PM, Room 4AB

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