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Introduction

This exercise runs the GSI 4 Dimensional Ensemble-Variational (EnVar) hybrid analysis with the ARW background and conventional data at 18z August 12, 2018.

Please note the ARW background field is provided at three time levels in netcdf format from case 6, and the NAM BE is employed as the background error covariance in this experiment. The global ensemble files at three time levels are linked to run this GSI 4DEnVar hybrid test.

Please check the Download Practice Data section if need to obtain the background, observation, and ensemble forecast files.