New data assimilation system DNDAS for high-dimensional models
Huang Qun-bo1, 2, 3, †, , Cao Xiao-qun1, 3, Zhu Meng-bin1, 3, Zhang Wei-min1, 3, Liu Bai-nian1, 3
       

Trends of (a) the cost function and (b) its gradient norm.