Four-dimensional local ensemble transform Kalman filter:

filter 4dIn this paper, we propose an efficient and practical implementation of a four-dimensional variational ensemble Kalman filter 4D-EnKF via a modified Cholesky decomposition. The mainA four-dimension (4D) bidirectional dital filter, having a minimum number of delay elements, is presented. This filter, besides having a minimum number of delay elements, also has an