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Using relatively new Thompson cloud fraction scheme, tune a few things to cause fewer overall clouds, particularly high clouds #809

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merged 9 commits into from
Jan 18, 2022
Merged

Using relatively new Thompson cloud fraction scheme, tune a few things to cause fewer overall clouds, particularly high clouds #809

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5ebe5dc
following early results by Anning, make fewer clouds, especially high…
gthompsnWRF Dec 13, 2021
b7ddc45
add in less LWC and IWC in the partly cloudy boxes
gthompsnWRF Dec 14, 2021
a1ca10e
bug fix, LM should have been IM
gthompsnWRF Dec 16, 2021
79325a5
make gridkm even simpler
gthompsnWRF Dec 17, 2021
20e3b79
make gridkm array in X-dimension
gthompsnWRF Dec 17, 2021
5a93312
alter aerosol surface emission based on a WRF change tested by Jimy D…
gthompsnWRF Jan 6, 2022
a45d641
one more tuning for reducing cloud ice amounts in partly cloudy boxes
gthompsnWRF Jan 6, 2022
2181d0c
reduce max ice number conc to fewer than 500 per liter of air
gthompsnWRF Jan 6, 2022
251afdc
Merge branch 'main' into make_fewer_high_clouds
gthompsnWRF Jan 13, 2022
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2 changes: 1 addition & 1 deletion physics/GFS_rrtmg_pre.F90
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Expand Up @@ -236,7 +236,7 @@ subroutine GFS_rrtmg_pre_run (im, levs, lm, lmk, lmp, n_var_lndp, &
LP1 = LM + 1 ! num of in/out levels


gridkm = sqrt(2.0)*sqrt(dx(1)*0.001*dx(1)*0.001)
gridkm = dx(nint(0.5*IM))*0.001
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I think you need to use gridkm(i) = dx(i)*0.001 or simply pass dx with units km in the CCPP metadata (unless it is used elsewhere in units m in the same routine) and use dx(i) directly.


if (imp_physics == imp_physics_thompson) then
max_relh = 1.5
Expand Down
24 changes: 12 additions & 12 deletions physics/radiation_clouds.f
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Expand Up @@ -3452,7 +3452,7 @@ subroutine progcld_thompson &
do i = 1, IX
cwp(i,k) = max(0.0, clw(i,k,ntcw) * dz(i,k)*1.E6)
crp(i,k) = 0.0
snow_mass_factor = 0.85
snow_mass_factor = 0.90
cip(i,k) = max(0.0, (clw(i,k,ntiw) &
& + (1.0-snow_mass_factor)*clw(i,k,ntsw))*dz(i,k)*1.E6)
if (re_snow(i,k) .gt. snow_max_radius)then
Expand Down Expand Up @@ -4532,8 +4532,8 @@ SUBROUTINE cal_cldfra3(CLDFRA, qv, qc, qi, qs, dz, &
DO k = kts,kte

delz = MAX(100., dz(k))
RH_00L = 0.74+MIN(0.25,SQRT(1./(50.0+gridkm*gridkm*delz*0.01)))
RH_00O = 0.82+MIN(0.17,SQRT(1./(50.0+gridkm*gridkm*delz*0.01)))
RH_00L = 0.77+MIN(0.22,SQRT(1./(50.0+gridkm*gridkm*delz*0.01)))
RH_00O = 0.85+MIN(0.14,SQRT(1./(50.0+gridkm*gridkm*delz*0.01)))
RHUM = rh(k)

if (qc(k).ge.1.E-5 .or. qi(k).ge.1.E-5 &
Expand All @@ -4550,7 +4550,7 @@ SUBROUTINE cal_cldfra3(CLDFRA, qv, qc, qi, qs, dz, &
RH_00 = RH_00L
ENDIF

tc = t(k) - 273.15
tc = MAX(-80.0, t(k) - 273.15)
if (tc .lt. -12.0) RH_00 = RH_00L

if (tc .gt. 20.0) then
Expand All @@ -4562,12 +4562,12 @@ SUBROUTINE cal_cldfra3(CLDFRA, qv, qc, qi, qs, dz, &
if (max_relh.gt.1.12 .or. (.NOT.(modify_qvapor)) ) then
!..For HRRR model, the following look OK.
RHUM = MIN(rh(k), 1.45)
RH_00 = RH_00 + (1.45-RH_00)*(-12.0-tc)/(-12.0+112.)
RH_00 = RH_00 + (1.45-RH_00)*(-12.0-tc)/(-12.0+85.)
CLDFRA(K) = MAX(0.,1.0-SQRT((1.46-RHUM)/(1.46-RH_00)))
else
!..but for the GFS model, RH is way lower.
RHUM = MIN(rh(k), 1.05)
RH_00 = RH_00 + (1.05-RH_00)*(-12.0-tc)/(-12.0+112.)
RH_00 = RH_00 + (1.05-RH_00)*(-12.0-tc)/(-12.0+85.)
CLDFRA(K) = MAX(0.,1.0-SQRT((1.06-RHUM)/(1.06-RH_00)))
endif
endif
Expand Down Expand Up @@ -4789,9 +4789,9 @@ SUBROUTINE adjust_cloudIce(cfr,qi,qs,qvs,T,dz,entr, k1,k2,kts,kte)
max_iwc = ABS(qvs(k2)-qvs(k1))

do k = k1, k2
max_iwc = MAX(1.E-5, max_iwc - (qi(k)+qs(k)))
max_iwc = MAX(1.E-6, max_iwc - (qi(k)+qs(k)))
enddo
max_iwc = MIN(2.E-3, max_iwc)
max_iwc = MIN(1.E-4, max_iwc)

this_dz = 0.0
do k = k1, k2
Expand All @@ -4801,7 +4801,7 @@ SUBROUTINE adjust_cloudIce(cfr,qi,qs,qvs,T,dz,entr, k1,k2,kts,kte)
this_dz = this_dz + dz(k)
endif
this_iwc = max_iwc*this_dz/tdz
iwc = MAX(5.E-6, this_iwc*(1.-entr))
iwc = MAX(1.E-6, this_iwc*(1.-entr))
if (cfr(k).gt.0.0.and.cfr(k).lt.1.0.and.T(k).ge.203.16) then
qi(k) = qi(k) + cfr(k)*cfr(k)*iwc
endif
Expand Down Expand Up @@ -4830,9 +4830,9 @@ SUBROUTINE adjust_cloudH2O(cfr, qc, qvs,T,dz,entr, k1,k2,kts,kte)
! print*, ' max_lwc = ', max_lwc, ' over DZ=',tdz

do k = k1, k2
max_lwc = MAX(1.E-5, max_lwc - qc(k))
max_lwc = MAX(1.E-6, max_lwc - qc(k))
enddo
max_lwc = MIN(2.E-3, max_lwc)
max_lwc = MIN(1.E-4, max_lwc)

this_dz = 0.0
do k = k1, k2
Expand All @@ -4842,7 +4842,7 @@ SUBROUTINE adjust_cloudH2O(cfr, qc, qvs,T,dz,entr, k1,k2,kts,kte)
this_dz = this_dz + dz(k)
endif
this_lwc = max_lwc*this_dz/tdz
lwc = MAX(5.E-6, this_lwc*(1.-entr))
lwc = MAX(1.E-6, this_lwc*(1.-entr))
if (cfr(k).gt.0.0.and.cfr(k).lt.1.0.and.T(k).ge.253.16) then
qc(k) = qc(k) + cfr(k)*cfr(k)*lwc
endif
Expand Down