A Local Formulation of the Ensemble Transform (ET) Analysis Perturbation Scheme
Justin McLay, Craig H Bishop, Carolyn A Reynolds
WEATHER AND FORECASTING | AMER METEOROLOGICAL SOC | Published : 2010
Following ideas from the local ensemble transform Kalman filter, a local formulation of the ensemble transform (ET) analysis perturbation scheme is developed by partitioning the numerical weather prediction model domain into latitude bands or latitude-longitude blocks. In comparison with analysis perturbations from the original "global" ET formulation, analysis perturbations from the "banded" or "block" ET formulations are much more consistent with estimates of analysis error variance. Banded or block ET forecast ensembles also perform better under a variety of verification metrics than do global ET forecast ensembles. Substantial performance gains are observed for both the midlatitudes and ..View full abstract
Awarded by Office of Naval Research
This research was sponsored by the Naval Research Laboratory and the Office of Naval Research under Program Element 0601153N, Project BE-033-03-04M. The DoD High Performance Computing program at NAVO MSRC provided the computing resources. The manuscript benefited considerably from the comments of three anonymous reviewers.