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compns_stochy.F90
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!>@brief The module 'compns_stochy_mod' contains the subroutine compns_stochy
module compns_stochy_mod
implicit none
contains
!-----------------------------------------------------------------------
!>@brief The module 'compns_stochy_mod' set the default namelist options reads in the stochastic physics namelist
!! and sets logicals and other parameters based on the namelist
!>@details Namelist can be either a file, or an internal namelist
subroutine compns_stochy (me,sz_nml,input_nml_file,fn_nml,nlunit,deltim,iret)
!$$$ Subprogram Documentation Block
!
! Subprogram: compns Check and compute namelist frequencies
! Prgmmr: Iredell Org: NP23 Date: 1999-01-26
!
! Abstract: This subprogram checks global spectral model namelist
! frequencies in hour units for validity. If they are valid,
! then the frequencies are computed in timestep units.
! The following rules are applied:
! 1. the timestep must be positive;
!
! Program History Log:
! 2016-10-11 Phil Pegion make the stochastic physics stand alone
!
! Usage: call compns_stochy (me,deltim,nlunit, stochy_namelist,iret)
! Input Arguments:
! deltim - real timestep in seconds
! Output Arguments:
! iret - integer return code (0 if successful or
! between 1 and 8 for which rule above was broken)
! stochy_namelist
!
! Attributes:
! Language: Fortran 90
!
!$$$
use stochy_namelist_def
implicit none
integer, intent(out) :: iret
integer, intent(in) :: nlunit,me,sz_nml
character(len=*), intent(in) :: input_nml_file(sz_nml)
character(len=64), intent(in) :: fn_nml
real, intent(in) :: deltim
real tol,l_min
real :: rerth,circ,tmp_lat
integer k,ios
integer,parameter :: four=4
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
!
namelist /nam_stochy/ntrunc,lon_s,lat_s,sppt,sppt_tau,sppt_lscale,sppt_logit, &
iseed_shum,iseed_sppt,shum,shum_tau,&
shum_lscale,stochini,skeb_varspect_opt,sppt_sfclimit, &
skeb,skeb_tau,skeb_vdof,skeb_lscale,iseed_skeb,skeb_vfilt,skeb_diss_smooth, &
skeb_sigtop1,skeb_sigtop2,skebnorm,sppt_sigtop1,sppt_sigtop2,&
shum_sigefold,spptint,shumint,skebint,skeb_npass,use_zmtnblck,new_lscale, &
epbl,epbl_lscale,epbl_tau,iseed_epbl, &
ocnsppt,ocnsppt_lscale,ocnsppt_tau,iseed_ocnsppt,pbl_taper
namelist /nam_sfcperts/lndp_type,lndp_model_type, lndp_var_list, lndp_prt_list, &
iseed_lndp, lndp_tau,lndp_lscale
! For SPP physics parameterization perterbations
namelist /nam_sppperts/spp_var_list, spp_prt_list, iseed_spp, &
sppint,spp_tau,spp_lscale,spp_sigtop1,spp_sigtop2,spp_stddev_cutoff
rerth =6.3712e+6 ! radius of earth (m)
tol=0.01 ! tolerance for calculations
! spectral resolution defintion
ntrunc=-999
lon_s=-999
lat_s=-999
! can specify up to 5 values for the stochastic physics parameters
! (each is an array of length 5)
sppt = -999. ! stochastic physics tendency amplitude
shum = -999. ! stochastic boundary layer spf hum amp
skeb = -999. ! stochastic KE backscatter amplitude
lndp_var_list = 'XXX'
lndp_prt_list = -999.
spp_var_list = 'XXXXXXXXXX'
spp_prt_list = -999.
! logicals
do_sppt = .false.
use_zmtnblck = .false.
new_lscale = .false.
do_shum = .false.
do_skeb = .false.
do_spp = .false.
! C. Draper July 2020.
! input land pert variables:
! LNDP_TYPE = 0
! no explicit land perturbations
! LNDP_Type = 1
! this is the initial land sfc pert scheme, introduced and tested for impact on GEFS forecasts.
! see https://journals.ametsoc.org/doi/full/10.1175/MWR-D-18-0057.1
! perturbations are assigned once at the start of the forecast
! LNDP_TYPE = 2
! this is the newer land pert scheme, introduced and tested for impact on UFS/GDAS cycling stsyem
! see https://journals.ametsoc.org/view/journals/hydr/22/8/JHM-D-21-0016.1.xml
lndp_type = 0 !
! LNDP_MODEL_TYPE
! integer indicating the model type for applying perturbations for lndp_type=2 scheme.
! 1 - global model
! (cycling of prognostic variables between DA cycles,
! parameters may be periodically updated during forecast)
! 2 - regional model
! (short foreast, prognotic variables re-initialized each forecast,
! parameters not updated during forecast)
! 3 - special case to apply perturbations only at start of forecast.
lndp_model_type = 0 !
lndp_lscale = -999. ! length scales
lndp_tau = -999. ! time scales
iseed_lndp = 0 ! random seeds (if 0 use system clock)
! for SKEB random patterns.
skeb_vfilt = 0
skebint = 0
spptint = 0
shumint = 0
skeb_npass = 11 ! number of passes of smoother for dissipation estiamte
sppt_tau = -999. ! time scales
shum_tau = -999.
skeb_tau = -999.
skeb_vdof = 5 ! proxy for vertical correlation, 5 is close to 40 passes of the 1-2-1 filter in the GFS
skebnorm = 0 ! 0 - random pattern is stream function, 1- pattern is kenorm, 2- pattern is vorticity
sppt_lscale = -999. ! length scales
shum_lscale = -999.
skeb_lscale = -999.
iseed_sppt = 0 ! random seeds (if 0 use system clock)
iseed_shum = 0
iseed_skeb = 0
! parameters to control vertical tapering of stochastic physics with
! height
sppt_sigtop1 = 0.1
sppt_sigtop2 = 0.025
skeb_sigtop1 = 0.1
skeb_sigtop2 = 0.025
shum_sigefold = 0.2
spp_sigtop1 = 0.1
spp_sigtop2 = 0.025
! reduce amplitude of sppt near surface (lowest 2 levels)
sppt_sfclimit = .false.
pbl_taper = (/0.0,0.5,1.0,1.0,1.0,1.0,1.0/)
! gaussian or power law variance spectrum for skeb (0: gaussian, 1:
! power law). If power law, skeb_lscale interpreted as a power not a
! length scale.
skeb_varspect_opt = 0
sppt_logit = .false. ! logit transform for sppt to bounded interval [-1,+1]
stochini = .false. ! true= read in pattern, false=initialize from seed
! For SPP perturbations
spp_lscale = -999. ! length scales
spp_tau = -999. ! time scales
spp_stddev_cutoff = 0 ! cutoff/limit for std-dev (zero==no limit applied)
iseed_spp = 0 ! random seeds (if 0 use system clock)
sppint = 0 ! SPP interval in seconds
#ifdef INTERNAL_FILE_NML
read(input_nml_file, nml=nam_stochy)
#else
rewind (nlunit)
open (unit=nlunit, file=fn_nml, action='READ', status='OLD', iostat=ios)
read(nlunit,nam_stochy)
#endif
#ifdef INTERNAL_FILE_NML
read(input_nml_file, nml=nam_sfcperts)
#else
rewind (nlunit)
open (unit=nlunit, file=fn_nml, action='READ', status='OLD', iostat=ios)
read(nlunit,nam_sfcperts)
#endif
#ifdef INTERNAL_FILE_NML
read(input_nml_file, nml=nam_sppperts, iostat=ios)
#else
rewind (nlunit)
open (unit=nlunit, file=fn_nml, action='READ', status='OLD', iostat=ios)
read(nlunit,nam_sppperts)
#endif
if (me == 0) then
print *,' in compns_stochy'
print*,'spp_lscale=',spp_lscale
print*,'spp_tau=',spp_tau
print*,'spp_stddev_cutoff=',spp_stddev_cutoff
endif
! PJP stochastic physics additions
IF (sppt(1) > 0 ) THEN
do_sppt=.true.
ENDIF
IF (shum(1) > 0 ) THEN
do_shum=.true.
! shum parameter has units of 1/hour, to remove time step
! dependence.
! change shum parameter units from per hour to per timestep
DO k=1,5
IF (shum(k) .gt. 0.0) shum(k)=shum(k)*deltim/3600.0
ENDDO
ENDIF
IF (skeb(1) > 0 ) THEN
do_skeb=.true.
if (skebnorm==0) then ! stream function norm
skeb=skeb*1.111e3*sqrt(deltim)
endif
if (skebnorm==1) then ! stream function norm
skeb=skeb*0.00222*sqrt(deltim)
endif
if (skebnorm==2) then ! vorticty function norm
skeb=skeb*1.111e-9*sqrt(deltim)
endif
ENDIF
IF (spp_prt_list(1) > 0 ) THEN
do_spp=.true.
ENDIF
! compute frequencty to estimate dissipation timescale
IF (do_skeb) THEN
IF (skebint == 0.) skebint=deltim
nsskeb=nint(skebint/deltim) ! skebint in seconds
IF(nsskeb<=0 .or. abs(nsskeb-skebint/deltim)>tol) THEN
WRITE(0,*) "SKEB interval is invalid",skebint
iret=9
return
ENDIF
ENDIF
IF (do_sppt) THEN
IF (spptint == 0.) spptint=deltim
nssppt=nint(spptint/deltim) ! spptint in seconds
IF(nssppt<=0 .or. abs(nssppt-spptint/deltim)>tol) THEN
WRITE(0,*) "SPPT interval is invalid",spptint
iret=9
return
ENDIF
ENDIF
IF (do_shum) THEN
IF (shumint == 0.) shumint=deltim
nsshum=nint(shumint/deltim) ! shumint in seconds
IF(nsshum<=0 .or. abs(nsshum-shumint/deltim)>tol) THEN
WRITE(0,*) "SHUM interval is invalid",shumint
iret=9
return
ENDIF
ENDIF
IF (do_spp) THEN
IF (sppint == 0.) sppint=deltim
nsspp=nint(sppint/deltim) ! sppint in seconds
IF(nsspp<=0 .or. abs(nsspp-sppint/deltim)>tol) THEN
WRITE(0,*) "SPP interval is invalid",sppint
iret=9
return
ENDIF
ENDIF
!calculate ntrunc if not supplied
if (ntrunc .LT. 1) then
if (me==0) print*,'ntrunc not supplied, calculating'
circ=2*3.1415928*rerth ! start with lengthscale that is circumference of the earth
l_min=circ
do k=1,5
if (sppt(k).GT.0) l_min=min(sppt_lscale(k),l_min)
if (shum(k).GT.0) l_min=min(shum_lscale(k),l_min)
if (skeb(k).GT.0) l_min=min(skeb_lscale(k),l_min)
enddo
if (lndp_type.GT.0) l_min=min(lndp_lscale(1),l_min)
if (spp_prt_list(1).GT.0) l_min=min(spp_lscale(1),l_min)
!ntrunc=1.5*circ/l_min
ntrunc=circ/l_min
if (me==0) print*,'ntrunc calculated from l_min',l_min,ntrunc
endif
! ensure lat_s is a mutiple of 4 with a reminader of two
ntrunc=INT((ntrunc+1)/four)*four+2
if (me==0) print*,'NOTE ntrunc adjusted for even nlats',ntrunc
! set up gaussian grid for ntrunc if not already defined.
if (lon_s.LT.1 .OR. lat_s.LT.1) then
lat_s=ntrunc*1.5+1
lon_s=lat_s*2+4
! Grid needs to be larger since interpolation is bi-linear
lat_s=lat_s*2
lon_s=lon_s*2
if (me==0) print*,'gaussian grid not set, defining here',lon_s,lat_s
endif
!
! land perts - parse nml input
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
select case (lndp_type)
case (0)
if (me==0) print*, &
'no land perturbations selected'
case (1,2)
! count requested pert variables
n_var_lndp= 0
do k =1,size(lndp_var_list)
if ( (lndp_var_list(k) .EQ. 'XXX') .or. (lndp_prt_list(k) .LE. 0.) ) then
cycle
else
n_var_lndp=n_var_lndp+1
lndp_var_list( n_var_lndp) = lndp_var_list(k)
lndp_prt_list( n_var_lndp) = lndp_prt_list(k)
endif
enddo
if (n_var_lndp > max_n_var_lndp) then
print*, 'ERROR: land perturbation requested for too many parameters', &
'increase max_n_var_lndp'
iret = 10
return
endif
if (lndp_type==1) then
if (me==0) print*, &
'lndp_type=1, land perturbations will be applied to selected paramaters, using older scheme designed for S2S fcst spread with the noah LSM'
! sanity-check requested input
do k =1,n_var_lndp
select case (lndp_var_list(k))
case('rz0','rzt','shc','lai','vgf','alb')
if (me==0) print*, 'land perturbation will be applied to ', lndp_var_list(k)
case default
print*, 'ERROR: land perturbation requested for unknown parameter', lndp_var_list(k)
iret = 10
return
end select
enddo
elseif(lndp_type==2) then
if (me==0) print*, &
'land perturbations will be applied to selected paramaters, using newer scheme designed for DA ens spread'
! check requested parameters have been coded.
! note, Noah-MP specific checks will be done later (since need to know lsm type)
do k =1,n_var_lndp
select case (lndp_var_list(k))
case('vgf','smc','stc','alb', 'sal','emi','zol')
if (me==0) print*, 'land perturbation will be applied to ', lndp_var_list(k)
case default
print*, 'ERROR: land perturbation requested for new parameter - will need to be coded in lndp_apply_pert', lndp_var_list(k)
iret = 10
return
end select
enddo
if ( (lndp_model_type < 1) .or. (lndp_model_type > 3) ) then
print*, 'ERROR: for lndp_type=2, must have lndp_model_type = 1,2,3'
iret = 10
return
endif
endif
case default
if (me==0) print*, &
'lndp_type out of range, set to 0 (none), 1 (for fcst spread), 2 (for cycling DA spread)'
iret = 10
return
end select
!
! SPP perts - parse nml input
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
! count requested pert variables
n_var_spp= 0
do k =1,size(spp_var_list)
if ( (spp_var_list(k) .EQ. 'XXXXXXXXXX') .or. (spp_prt_list(k) .LE. 0.) ) then
cycle
else
n_var_spp=n_var_spp+1
spp_var_list( n_var_spp) = spp_var_list(k) !
spp_prt_list( n_var_spp) = spp_prt_list(k)
endif
enddo
IF (n_var_spp > 0 ) THEN
do_spp=.true.
ENDIF
if (n_var_spp > max_n_var_spp) then
print*, 'ERROR: SPP physics perturbation requested for too many parameters', &
'increase max_n_var_spp'
iret = 10
return
endif
if (me==0) print*, &
'SPP physics perturbations will be applied to selected parameters', n_var_spp
do k =1,n_var_spp
select case (spp_var_list(k))
case('pbl','sfc', 'mp','rad','gwd','cu_deep')
if (me==0) print*, 'SPP physics perturbation will be applied to ', spp_var_list(k)
case default
print*, 'ERROR: SPP physics perturbation requested for new parameter - will need to be coded in spp_apply_pert', spp_var_list(k)
iret = 10
return
end select
enddo
!
! All checks are successful.
!
if (me == 0) then
print *, 'stochastic physics'
print *, ' do_sppt : ', do_sppt
print *, ' do_shum : ', do_shum
print *, ' do_skeb : ', do_skeb
print *, ' lndp_type : ', lndp_type
print *, ' lndp_model_type : ', lndp_model_type
if (lndp_type .NE. 0) print *, ' n_var_lndp : ', n_var_lndp
print *, ' do_spp : ', do_spp
print *, ' n_var_spp : ', n_var_spp
endif
iret = 0
!
return
end subroutine compns_stochy
subroutine compns_stochy_ocn (deltim,iret)
!$$$ Subprogram Documentation Block
!
! Subprogram: compns Check and compute namelist frequencies
! Prgmmr: Iredell Org: NP23 Date: 1999-01-26
!
! Abstract: This subprogram checks global spectral model namelist
! frequencies in hour units for validity. If they are valid,
! then the frequencies are computed in timestep units.
! The following rules are applied:
! 1. the timestep must be positive;
!
! Program History Log:
! 2016-10-11 Phil Pegion make the stochastic physics stand alone
!
! Usage: call compns_stochy (me,deltim,nlunit, stochy_namelist,iret)
! Input Arguments:
! deltim - real timestep in seconds
! Output Arguments:
! iret - integer return code (0 if successful or
! between 1 and 8 for which rule above was broken)
! stochy_namelist
!
! Attributes:
! Language: Fortran 90
!
!$$$
use stochy_namelist_def
use mpp_mod ,only: mpp_pe,mpp_root_pe
implicit none
real, intent(in) :: deltim
integer, intent(out) :: iret
real tol,l_min
real :: rerth,circ
integer k,ios,nlunit
integer,parameter :: four=4
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
!
namelist /nam_stochy/ntrunc,lon_s,lat_s,sppt,sppt_tau,sppt_lscale,sppt_logit, &
iseed_shum,iseed_sppt,shum,shum_tau, &
shum_lscale,stochini,skeb_varspect_opt,sppt_sfclimit, &
skeb,skeb_tau,skeb_vdof,skeb_lscale,iseed_skeb,skeb_vfilt,skeb_diss_smooth, &
skeb_sigtop1,skeb_sigtop2,skebnorm,sppt_sigtop1,sppt_sigtop2,&
shum_sigefold,spptint,shumint,skebint,skeb_npass,use_zmtnblck,new_lscale, &
epbl,epbl_lscale,epbl_tau,iseed_epbl, &
ocnsppt,ocnsppt_lscale,ocnsppt_tau,iseed_ocnsppt,pbl_taper
namelist /nam_sfcperts/lndp_type,lndp_model_type,lndp_var_list, lndp_prt_list, iseed_lndp, &
lndp_tau,lndp_lscale
rerth =6.3712e+6 ! radius of earth (m)
tol=0.01 ! tolerance for calculations
nlunit=322
! spectral resolution defintion
ntrunc=-999
lon_s=-999
lat_s=-999
! can specify up to 5 values for the stochastic physics parameters
! (each is an array of length 5)
epbl = -999. ! stochastic physics tendency amplitude
ocnsppt = -999. ! stochastic physics tendency amplitude
! logicals
pert_epbl = .false.
do_ocnsppt = .false.
new_lscale = .false.
epblint = 0
ocnspptint = 0
epbl_tau = -999. ! time scales
ocnsppt_tau = -999. ! time scales
epbl_lscale = -999. ! length scales
ocnsppt_lscale = -999. ! length scales
iseed_epbl = 0 ! random seeds (if 0 use system clock)
iseed_epbl2 = 0 ! random seeds (if 0 use system clock)
iseed_ocnsppt = 0 ! random seeds (if 0 use system clock)
rewind (nlunit)
open (unit=nlunit, file='input.nml', action='READ', status='OLD', iostat=ios)
read(nlunit,nam_stochy)
if (mpp_pe()==mpp_root_pe()) then
print *,' in compns_stochy_ocn'
endif
! PJP stochastic physics additions
IF (epbl(1) > 0 ) THEN
pert_epbl=.true.
ENDIF
IF (ocnsppt(1) > 0 ) THEN
do_ocnsppt=.true.
ENDIF
! compute frequencty to update random pattern
IF (epblint == 0.) epblint=deltim
nsepbl=nint(epblint/deltim) ! epblint in seconds
IF(nsepbl<=0 .or. abs(nsepbl-epblint/deltim)>tol) THEN
WRITE(0,*) "ePBL interval is invalid",epblint
iret=9
return
ENDIF
IF (ocnspptint == 0.) ocnspptint=deltim
nsocnsppt=nint(ocnspptint/deltim) ! ocnspptint in seconds
IF(nsocnsppt<=0 .or. abs(nsocnsppt-ocnspptint/deltim)>tol) THEN
WRITE(0,*) "ePBL interval is invalid",ocnspptint
iret=9
return
ENDIF
!calculate ntrunc if not supplied
if (ntrunc .LT. 1) then
if (mpp_pe()==mpp_root_pe()) print*,'ntrunc not supplied, calculating'
circ=2*3.1415928*rerth ! start with lengthscale that is circumference of the earth
l_min=circ
do k=1,5
if (epbl(k).GT.0) l_min=min(epbl_lscale(k),l_min)
if (ocnsppt(k).GT.0) l_min=min(ocnsppt_lscale(k),l_min)
enddo
!ntrunc=1.5*circ/l_min
ntrunc=circ/l_min
if (mpp_pe()==mpp_root_pe()) print*,'ntrunc calculated from l_min',l_min,ntrunc
endif
! ensure lat_s is a mutiple of 4 with a reminader of two
ntrunc=INT((ntrunc+1)/four)*four+2
if (mpp_pe()==mpp_root_pe()) print*,'NOTE ntrunc adjusted for even nlats',ntrunc
! set up gaussian grid for ntrunc if not already defined.
if (lon_s.LT.1 .OR. lat_s.LT.1) then
lat_s=ntrunc*1.5+1
lon_s=lat_s*2+4
! Grid needs to be larger since interpolation is bi-linear
lat_s=lat_s*2
lon_s=lon_s*2
if (mpp_pe()==mpp_root_pe()) print*,'gaussian grid not set, defining here',lon_s,lat_s
endif
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
!
! All checks are successful.
!
if (mpp_pe()==mpp_root_pe()) then
print *, 'ocean stochastic physics'
print *, ' pert_epbl : ', pert_epbl
print *, ' do_ocnsppt : ', do_ocnsppt
endif
iret = 0
if (iseed_epbl(1) > 0) iseed_epbl2(1)=iseed_epbl(1)-1234567
!
return
end subroutine compns_stochy_ocn
end module compns_stochy_mod