| THE SENSITIVITY INFLUENCE OF NUMERICAL MODEL INITIAL VALUES ON FOUR-DIMENSIONAL ASSIMILATION—STUDY BASED ON LORENZ SYSTEM |
| |
| 引用本文： | 郜吉东,邱崇践,丑纪范.THE SENSITIVITY INFLUENCE OF NUMERICAL MODEL INITIAL VALUES ON FOUR-DIMENSIONAL ASSIMILATION—STUDY BASED ON LORENZ SYSTEM[J].Acta Meteorologica Sinica,1995(3). |
| |
| 作者姓名： | 郜吉东 邱崇践 丑纪范 |
| |
| 作者单位： | Department of Atmospheric Sciences Lanzhou University，Lanzhou 730000，Department of Atmospheric Sciences，Lanzhou University，Lanzhou 730000，Department of Atmospheric Sciences，Lanzhou University，Lanzhou 730000 |
| |
| 基金项目： | This work was supported by the National Natural Science Foundation of China under Grant 49375241. |
| |
| 摘 要： | Numerical experiments of adjoint variational assimilation have been performed using the knownLorenz system.With the increase of sensitivity of model's initial values,it is more and more difficultto use the adjoint method to get the initial values which are consistent with the dynamics of the fore-cast model.Under some circumstances the algorithm completely fails.This shows that four-dimen-sional assimilation is related to the limit of predictability.On the other hand.with the increase ofmodel equation's error,the result of variational assimilation may become worse and worse so that theprediction has no meaning.But if the model parameters are corrected when variational assimilation ismade,the forecast results can be greatly improved based on Lorenz model.
|
| 本文献已被 CNKI 等数据库收录！ |
