\hypertarget{group__ugwp__driverv0__mod}{}\doxysubsection{GFS UGWP V0 Driver Module}
\label{group__ugwp__driverv0__mod}\index{GFS UGWP V0 Driver Module@{GFS UGWP V0 Driver Module}}


This is the CIRES UGWP V0 driver module.  


Collaboration diagram for GFS UGWP V0 Driver Module\+:\nopagebreak
\begin{figure}[H]
\begin{center}
\leavevmode
\includegraphics[width=348pt]{group__ugwp__driverv0__mod}
\end{center}
\end{figure}
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 FV3\+GFS, 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 (\mbox{\hyperlink{GFS_GWDPS}{GFS Orographic Gravity Wave Drag Scheme}}) and its \char`\"{}call\char`\"{} moved into UGWP-\/driver subroutine. This combination of NGW and OGW schemes was tested in the FV3\+GFS-\/\+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 (\mbox{\hyperlink{GFS_GWDPS}{GFS Orographic Gravity Wave Drag Scheme}}), FV3\+GFS 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 \cite{yudin_et_al_2019}). The first multi-\/year (2015-\/2018) FV3\+GFS simulations with UGWP-\/v0 also produce the equatorial QBO-\/like oscillations in the zonal wind and temperature anomalies. 