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Fixed instability in upper atmosphere due to OGWD #111

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merged 9 commits into from
Oct 23, 2023
Merged

Fixed instability in upper atmosphere due to OGWD #111

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c0ec619
Added tendency limiter for mesosphere and horizontal wave number filt…
mdtoyNOAA Sep 19, 2023
627a3bb
Merge branch 'ufs/dev' of https://github.com/ufs-community/ccpp-physi…
mdtoyNOAA Oct 6, 2023
e08ecd6
land surface updates for hr3
HelinWei-NOAA Oct 6, 2023
4f8004a
remove one printout from sfcsub.f and uncomment z0m composition in mo…
HelinWei-NOAA Oct 6, 2023
4704ecf
Merge branch 'hr3_land_upgrades' of https://github.com/HelinWei-NOAA/…
mdtoyNOAA Oct 16, 2023
2f417bb
refine surface 2m t/q diagnostic method
HelinWei-NOAA Oct 17, 2023
df0a259
Merge branch 'hr3_land_upgrades' of https://github.com/HelinWei-NOAA/…
mdtoyNOAA Oct 17, 2023
ba68fe7
Merge branch 'ufs/dev' of https://github.com/ufs-community/ccpp-physi…
mdtoyNOAA Oct 19, 2023
55c5102
Merge branch 'ufs/dev' of https://github.com/ufs-community/ccpp-physi…
mdtoyNOAA Oct 20, 2023
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26 changes: 24 additions & 2 deletions physics/drag_suite.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -460,6 +460,8 @@ subroutine drag_suite_run( &
real(kind=kind_phys), parameter :: ce = 0.8
real(kind=kind_phys), parameter :: cg = 0.5
real(kind=kind_phys), parameter :: sgmalolev = 0.5 ! max sigma lvl for dtfac
real(kind=kind_phys), parameter :: plolevmeso = 70.0 ! pres lvl for mesosphere OGWD reduction (Pa)
real(kind=kind_phys), parameter :: facmeso = 0.5 ! fractional velocity reduction for OGWD
integer,parameter :: kpblmin = 2

!
Expand All @@ -472,7 +474,7 @@ subroutine drag_suite_run( &
rcsks,wdir,ti,rdz,tem2,dw2,shr2, &
bvf2,rdelks,wtkbj,tem,gfobnv,hd,fro, &
rim,temc,tem1,efact,temv,dtaux,dtauy, &
dtauxb,dtauyb,eng0,eng1
dtauxb,dtauyb,eng0,eng1,ksmax,dtfac_meso
!
logical :: ldrag(im),icrilv(im), &
flag(im),kloop1(im)
Expand Down Expand Up @@ -887,6 +889,14 @@ subroutine drag_suite_run( &
ldrag(i) = ldrag(i) .or. bnv2(i,1).le.0.0
ldrag(i) = ldrag(i) .or. ulow(i).eq.1.0
ldrag(i) = ldrag(i) .or. var_stoch(i) .le. 0.0
! Check if mesoscale gravity waves will propagate vertically or be evanescent
! and not impart a drag force -- consider the maximum sub-grid horizontal
! topographic wavelength to be one-half the horizontal grid spacing -- calculate
! ksmax accordingly
ksmax = 4.0*pi/dx(i) ! based on wavelength = 0.5*dx(i)
if ( bnv2(i,1).gt.0.0 ) then
ldrag(i) = ldrag(i) .or. sqrt(bnv2(i,1))*rulow(i).lt.ksmax
endif
!
! set all ri low level values to the low level value
!
Expand Down Expand Up @@ -1106,7 +1116,19 @@ subroutine drag_suite_run( &
enddo
!
do k = kts,km
taud_ms(i,k) = taud_ms(i,k)*dtfac(i)* ls_taper(i) *(1.-rstoch(i))

! Check if well into mesosphere -- if so, perform similar reduction of
! velocity tendency due to mesoscale GWD to prevent sudden reversal of
! wind direction (similar to above)
dtfac_meso = 1.0
if (prsl(i,k).le.plolevmeso) then
if (taud_ms(i,k).ne.0.) &
dtfac_meso = min(dtfac_meso,facmeso*abs(velco(i,k) &
/(deltim*rcs*taud_ms(i,k))))
end if

taud_ms(i,k) = taud_ms(i,k)*dtfac(i)*dtfac_meso* &
ls_taper(i) *(1.-rstoch(i))
taud_bl(i,k) = taud_bl(i,k)*dtfac(i)* ls_taper(i) *(1.-rstoch(i))

dtaux = taud_ms(i,k) * xn(i)
Expand Down
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