用变分法修正边界层资料的数值试验

A NUMERICAL EXPERIMENT FOR MODIFYING THE OBSERVATION DATA IN BOUNDARY LAYER THE VARIATIONAL METHOD

中文关键词:  变分  边界层  数值试验

英文关键词:Variational  Planet boundary layer  Numerical experiment

中文摘要:

      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”。

英文摘要:

      The obser vational fields in planet boundary layer and the model errorare 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 gradientin he way of perturbation.It is the results of numerical experiment using model data thatindicate a better modify to model errorin this way.It makes the model describing the physical process more correctly.Then the initial fields to the model after modifying can be fitthe "observational data" best.