Current setting in GSI parm file only allow 12 levels above model grid, which in turn reject many observations in the mid-Stratosphere.
Proposed solution
Change the setting of ext_nsig from 12 to 14. After the changes, warning message in GSI log file WARNING GPSRO: 48 obs outside integration grid. Increase nsig_ext to 14 will disappear. Experiments that with or without this change show neutral impact on the model performance.
Description
Current setting in GSI parm file only allow 12 levels above model grid, which in turn reject many observations in the mid-Stratosphere.
Proposed solution
Change the setting of ext_nsig from 12 to 14. After the changes, warning message in GSI log file
WARNING GPSRO: 48 obs outside integration grid. Increase nsig_ext to 14will disappear. Experiments that with or without this change show neutral impact on the model performance.Status (optional)