Abstract: The observational fields in planet boundary layer and the modelerror are modified here in variational assimilation.The gradients of the cost function with respect to control variables are calculated in the way of perturbation.

• 文摘: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。