Browsing by Subject "4DEnVar"
Now showing items 1-2 of 2
-
A Multi-Resolution Ensemble Hybrid 4DEnVar with Variable Ensemble Sizes to Improve Global and Tropical Cyclone Track Numerical Prediction
(2022-05)One challenge associated with ensemble-based data assimilation (DA) is the quantitative estimation of the background error covariances. In the current global operational DA system, a reduced resolution background ensemble ... -
Reducing sampling errors of the background error covariance estimate in ensemble-based data assimilation
(2020-05-08)Ensemble-based data assimilation (DA) estimates forecast error in a flow-dependent fashion, in contrast to the traditional variational DA assuming static forecast error. Due to computational constraints, however, accuracy ...