Application of Model Constrained Variational Data Assimilation Scheme on WRFVAR

摘要

In variational data assimilation scheme,high frequency oscillations would be induced because of unbalance in the analysis fields while observation data are introduced.The model constrained scheme proposed by Liang et al.is used to minimize the time tendency of model variables,and thus eliminate the high frequency oscillations in the optimized initial conditions.In this study,the model constrained variational data assimilation scheme is implemented in WRF-4Dvar system.The primary experiments show that the model constraints used in WRF-4DVar can eliminate the high frequency oscillations obviously.