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Change orog gravity wave drag scheme for grid sizes less than 10km (#…
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…3175)

It has been found that while the HR4 GFS update improves the forecast
skill compared to the HR3 update, its skill is still less than that of
the HR2 update. To further improve the HR4 forecast skill, the tunable
parameter in the OGWD, 'effective grid size', has been tested. The
magnitude of the OGWD is inversely proportional to the effective grid
size (dx). The current default value of the effective grid size (dx) is
6*dx, which was optimally tuned for the C768 resolution (13km). It
appears that the 6*dx of the effective dx leads to too small OGWD for
the C1152 resolution (9km). Therefore, for the higher resolution of
which grid sizes are less than 10 km (i.e., C1152 and C3072) the
effective dx has been reduced to 2*dx in this update, which increased
the OGWD and significantly improved the GFS forecast skill in the C1152
resolution, compatible to the HR2 forecast skill.

Resolves: #3181
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@rhaesung
rhaesung authored Dec 20, 2024
1 parent d479111 commit e684944
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Showing 2 changed files with 18 additions and 0 deletions.
7 changes: 7 additions & 0 deletions parm/config/gefs/config.ufs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,7 @@ case "${fv3_res}" in
export xr_cnvcld=".true." # Pass conv. clouds to Xu-Randall cloud fraction
export cdmbgwd="0.071,2.1,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="40.0,1.77,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export k_split=1
export n_split=4
export tau=10.0
Expand All @@ -107,6 +108,7 @@ case "${fv3_res}" in
export xr_cnvcld=".true." # Pass conv. clouds to Xu-Randall cloud fraction
export cdmbgwd="0.14,1.8,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="20.0,2.5,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=3.0e-3 # setting for UGWPv1 non-stationary GWD
export k_split=1
export n_split=4
Expand All @@ -130,6 +132,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=2
export cdmbgwd="0.23,1.5,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="10.0,3.5,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=1.5e-3 # setting for UGWPv1 non-stationary GWD
export xr_cnvcld=".true." # Pass conv. clouds to Xu-Randall cloud fraction
export k_split=2
Expand All @@ -154,6 +157,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=2
export cdmbgwd="1.1,0.72,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="5.0,5.0,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=0.8e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=4
Expand All @@ -177,6 +181,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=4
export cdmbgwd="4.0,0.15,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="2.5,7.5,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=0.5e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=4
Expand All @@ -200,6 +205,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=4
export cdmbgwd="4.0,0.10,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="1.67,8.8,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=2.0
export knob_ugwp_tauamp=0.35e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=6
Expand All @@ -223,6 +229,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=4
export cdmbgwd="4.0,0.05,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="0.625,14.1,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=2.0
export knob_ugwp_tauamp=0.13e-3 # setting for UGWPv1 non-stationary GWD
export k_split=4
export n_split=5
Expand Down
11 changes: 11 additions & 0 deletions parm/config/gfs/config.ufs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,7 @@ case "${fv3_res}" in
export xr_cnvcld=".false." # Do not pass conv. clouds to Xu-Randall cloud fraction
export cdmbgwd="0.071,2.1,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="40.0,1.77,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=6.0e-3 # setting for UGWPv1 non-stationary GWD
export k_split=1
export n_split=4
Expand All @@ -124,6 +125,7 @@ case "${fv3_res}" in
export npy_nest=241
export NEST_DLON=0.25
export NEST_DLAT=0.25
export psl_gwd_dx_factor=6.0
export WRITE_GROUP_GDAS=2
export WRTTASK_PER_GROUP_PER_THREAD_PER_TILE_GDAS=2
export WRITE_GROUP_GFS=2
Expand All @@ -141,6 +143,7 @@ case "${fv3_res}" in
export xr_cnvcld=.false. # Do not pass conv. clouds to Xu-Randall cloud fraction
export cdmbgwd="0.14,1.8,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="20.0,2.5,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=3.0e-3 # setting for UGWPv1 non-stationary GWD
export k_split=1
export n_split=4
Expand All @@ -167,6 +170,7 @@ case "${fv3_res}" in
export npy_nest=481
export NEST_DLON=0.125
export NEST_DLAT=0.125
export psl_gwd_dx_factor=6.0
export WRITE_GROUP_GDAS=2
export WRTTASK_PER_GROUP_PER_THREAD_PER_TILE_GDAS=15
export WRITE_GROUP_GFS=2
Expand All @@ -183,6 +187,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=2
export cdmbgwd="0.23,1.5,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="10.0,3.5,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=1.5e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=4
Expand Down Expand Up @@ -211,6 +216,7 @@ case "${fv3_res}" in
export npy_nest=961
export NEST_DLON=0.0625
export NEST_DLAT=0.0625
export psl_gwd_dx_factor=2.0
export WRITE_GROUP_GDAS=2
export WRTTASK_PER_GROUP_PER_THREAD_PER_TILE_GDAS=20
export WRITE_GROUP_GFS=2
Expand All @@ -227,6 +233,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=2
export cdmbgwd="1.1,0.72,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="5.0,5.0,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=0.8e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=4
Expand Down Expand Up @@ -258,6 +265,7 @@ case "${fv3_res}" in
export npy_nest=1921
export NEST_DLON=0.0325
export NEST_DLAT=0.0325
export psl_gwd_dx_factor=2.0
export WRITE_GROUP_GDAS=2
export WRTTASK_PER_GROUP_PER_THREAD_PER_TILE_GDAS=90
export WRITE_GROUP_GFS=2
Expand All @@ -274,6 +282,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=4
export cdmbgwd="4.0,0.15,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="2.5,7.5,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=6.0
export knob_ugwp_tauamp=0.5e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=4
Expand All @@ -298,6 +307,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=4
export cdmbgwd="4.0,0.10,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="1.67,8.8,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=2.0
export knob_ugwp_tauamp=0.35e-3 # setting for UGWPv1 non-stationary GWD
export k_split=2
export n_split=6
Expand All @@ -321,6 +331,7 @@ case "${fv3_res}" in
export nthreads_ufs_gfs=4
export cdmbgwd="4.0,0.05,1.0,1.0" # mountain blocking, ogwd, cgwd, cgwd src scaling
export cdmbgwd_gsl="0.625,14.1,1.0,1.0" # settings for GSL drag suite
export psl_gwd_dx_factor=2.0
export knob_ugwp_tauamp=0.13e-3 # setting for UGWPv1 non-stationary GWD
export k_split=4
export n_split=5
Expand Down

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