摘要
文中用变分方法修正边界层资料及模误差 ,目标函数相对于控制变量的梯度用扰动法计算 ,对利用小扰动求取梯度的方法进行了理论推导和试验分析。利用模式资料所作的数值试验表明 ,该方法能有效地修正模式自身误差 ,使模式能精确描述边界层物理过程 ,从而使调整后的初始场最好地拟合“观测资料”
The observational fields in planet boundary layer and the model error are modified here in variational assimilation.The gradients of the cost function with respect to control variables are calculated in the way of perturbation. Then the inference in theory and experiment analysis is produced to the method how to obtain the gradient in he way of perturbation.It is the results of numerical experiment using model data that indicate a better modify to model error in this way .It makes the model describing the physical process more correctly.Then the initial fields to the model after modifying can be fit the 'observational data'best.
出处
《气象学报》
CSCD
北大核心
2001年第1期107-114,共8页
Acta Meteorologica Sinica
基金
国家自然科学基金项目"黑河实验资料优化处理研究"!4 95752 4 9
