This is the CIRES UGWP V0 driver module.

Note for the sub-grid scale orography scheme in UGWP-v0: Due to degraded forecast scores of simulations with revised schemes for subgrid-scale orography effects in FV3GFS, EMC reinstalled the original gwdps-code with updated efficiency factors for the mountain blocking and OGW drag. The GFS OGW is described in the separate section (GFS_GWDPS) and its "call" moved into UGWP-driver subroutine. This combination of NGW and OGW schemes was tested in the FV3GFS-L127 medium-range forecasts (15-30 days) for C96, C192, C384 and C768 resolutions and work in progress to introduce the optimal choice for the scale-aware representations of the efficiency factors that will reflect the better simulations of GW activity by FV3 dynamical core at higher horizontal resolutions. With the MERRA-2 VMF function for NGWs (slat_geos5_tamp_v0()) and operational OGW drag scheme (GFS_GWDPS), FV3GFS simulations can successfully forecast the recent major mid-winter sudden stratospheric warming (SSW) events of 2018-02-12 and 2018-12-31 (10-14 days before the SSW onset; Yudin et al. 2019 [144]). The first multi-year (2015-2018) FV3GFS simulations with UGWP-v0 also produce the equatorial QBO-like oscillations in the zonal wind and temperature anomalies.