Zonal treatement of Augmented Kalman filter algorithm

Introduction

The subpackage zonkf implements variations of the augkf with zonal and non-zonal coefficients of U separately treated. This algorithm has two flavours: which be can changed by setting coupled_zonals in the configuration file:

• Coupled ZonKF: The zonal and non-zonal coefficients are coupled through the forecast and by cross-covariances in the analyse. Set coupled_zonals to True in the configuration file to use this algorithm.

• Isolated ZonKF: The zonal and non-zonal coefficients are isolated. There is no forecast of the zonal coefficients nor cross-covariances with the non-zonal coefficients in the analyse.