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lndp_apply_perts.F90
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lndp_apply_perts.F90
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module lndp_apply_perts_mod
use kinddef, only : kind_dbl_prec
implicit none
private
public :: lndp_apply_perts
contains
!====================================================================
! lndp_apply_perts
!====================================================================
! Driver for applying perturbations to sprecified land states or parameters
! Draper, July 2020.
! Note on location: requires access to namelist_soilveg
subroutine lndp_apply_perts(blksz,lsm, lsoil,dtf, n_var_lndp, lndp_var_list, &
lndp_prt_list, sfc_wts, xlon, xlat, stype, maxsmc,param_update_flag, &
smc, slc, stc, vfrac, ierr)
implicit none
! intent(in)
integer, intent(in) :: blksz(:)
integer, intent(in) :: n_var_lndp, lsoil, lsm
character(len=3), intent(in) :: lndp_var_list(:)
real(kind=kind_dbl_prec), intent(in) :: lndp_prt_list(:)
real(kind=kind_dbl_prec), intent(in) :: dtf
real(kind=kind_dbl_prec), intent(in) :: sfc_wts(:,:,:)
real(kind=kind_dbl_prec), intent(in) :: xlon(:,:)
real(kind=kind_dbl_prec), intent(in) :: xlat(:,:)
logical, intent(in) :: param_update_flag
! true = parameters have been updated, apply perts
real(kind=kind_dbl_prec), intent(in) :: stype(:,:)
real(kind=kind_dbl_prec), intent(in) :: maxsmc(:)
! intent(inout)
real(kind=kind_dbl_prec), intent(inout) :: smc(:,:,:)
real(kind=kind_dbl_prec), intent(inout) :: slc(:,:,:)
real(kind=kind_dbl_prec), intent(inout) :: stc(:,:,:)
real(kind=kind_dbl_prec), intent(inout) :: vfrac(:,:)
! intent(out)
integer, intent(out) :: ierr
! local
integer :: nblks, print_i, print_nb, i, nb
integer :: this_im, v, soiltyp, k
logical :: print_flag
real(kind=kind_dbl_prec) :: p, min_bound, max_bound, tmp_sic, pert
! decrease in applied pert with depth
real(kind=kind_dbl_prec), dimension(4), parameter :: smc_vertscale = (/1.0,0.5,0.25,0.125/)
real(kind=kind_dbl_prec), dimension(4), parameter :: stc_vertscale = (/1.0,0.5,0.25,0.125/)
! model-dependent values, hard-wired in noah code.
real(kind=kind_dbl_prec), dimension(4), parameter :: zs_noah = (/0.1, 0.3, 0.6, 1.0/)
real(kind=kind_dbl_prec), parameter :: minsmc = 0.02
ierr = 0
if (lsm .NE. 1 ) then
write(6,*) 'ERROR: lndp_apply_pert assumes LSM is noah, ', &
' may need to adapt variable names for a different LSM'
ierr=10
return
endif
nblks = size(blksz)
call set_printing_nb_i(blksz,xlon,xlat,print_i,print_nb)
do nb =1,nblks
do i = 1, blksz(nb)
!if ( nint(Sfcprop(nb)%slmsk(i)) .NE. 1) cycle ! skip if not land
!if ( ((isot == 1) .and. (soiltyp == 16)) &
! .or.( (isot == 0) .and. (soiltyp == 9 )) ) cycle ! skip if land-ice
if ( smc(nb,i,1) .EQ. 1.) cycle ! skip non-soil (land-ice and non-land)
! set printing
if ( (i==print_i) .and. (nb==print_nb) ) then
print_flag = .true.
else
print_flag=.false.
endif
do v = 1,n_var_lndp
select case (trim(lndp_var_list(v)))
!=================================================================
! State updates - performed every cycle
!=================================================================
case('smc')
p=5.
soiltyp = int( stype(nb,i)+0.5 ) ! also need for maxsmc
min_bound = minsmc
max_bound = maxsmc(soiltyp)
do k=1,lsoil
!store frozen soil moisture
tmp_sic= smc(nb,i,k) - slc(nb,i,k)
! perturb total soil moisture
! factor of sldepth*1000 converts from mm to m3/m3
pert = sfc_wts(nb,i,v)*smc_vertscale(k)*lndp_prt_list(v)/(zs_noah(k)*1000.)
pert = pert*dtf/3600. ! lndp_prt_list input is per hour, convert to per timestep
! (necessary for state vars only)
call apply_pert('smc',pert,print_flag, smc(nb,i,k),ierr,p,min_bound, max_bound)
! assign all of applied pert to the liquid soil moisture
slc(nb,i,k) = smc(nb,i,k) - tmp_sic
enddo
case('stc')
do k=1,lsoil
pert = sfc_wts(nb,i,v)*stc_vertscale(k)*lndp_prt_list(v)
pert = pert*dtf/3600. ! lndp_prt_list input is per hour, convert to per timestep
! (necessary for state vars only)
call apply_pert('stc',pert,print_flag, stc(nb,i,k),ierr)
enddo
!=================================================================
! Parameter updates - only if param_update_flag = TRUE
!=================================================================
case('vgf') ! vegetation fraction
if (param_update_flag) then
p =5.
min_bound=0.
max_bound=1.
pert = sfc_wts(nb,i,v)*lndp_prt_list(v)
call apply_pert ('vfrac',pert,print_flag, vfrac(nb,i), ierr,p,min_bound, max_bound)
endif
case default
print*, &
'ERROR: unrecognised lndp_prt_list option in lndp_apply_pert, exiting', trim(lndp_var_list(v))
ierr = 10
return
end select
enddo
enddo
enddo
end subroutine lndp_apply_perts
!====================================================================
! apply_perts
!====================================================================
! Apply perturbations to selected land states or parameters
subroutine apply_pert(vname,pert,print_flag, state,ierr,p,vmin, vmax)
! intent in
logical, intent(in) :: print_flag
real(kind=kind_dbl_prec), intent(in) :: pert
character(len=*), intent(in) :: vname ! name of variable being perturbed
real(kind=kind_dbl_prec), optional, intent(in) :: p ! flat-top paramater, 0 = no flat-top
! flat-top function is used for bounded variables
! to reduce the magnitude of perturbations near boundaries.
real(kind=kind_dbl_prec), optional, intent(in) :: vmin, vmax ! min,max bounds of variable being perturbed
! intent (inout)
real(kind=kind_dbl_prec), intent(inout) :: state
! intent out
integer :: ierr
!local
real(kind=kind_dbl_prec) :: z
if ( print_flag ) then
write(*,*) 'LNDP - applying lndp to ',vname, ', initial value', state
endif
! apply perturbation
if (present(p) ) then
if ( .not. (present(vmin) .and. present(vmax) )) then
ierr=20
print*, 'error, flat-top function requires min & max to be specified'
endif
z = -1. + 2*(state - vmin)/(vmax - vmin) ! flat-top function
state = state + pert*(1-abs(z**p))
else
state = state + pert
endif
if (present(vmax)) state = min( state , vmax )
if (present(vmin)) state = max( state , vmin )
!state = max( min( state , vmax ), vmin )
if ( print_flag ) then
write(*,*) 'LNDP - applying lndp to ',vname, ', final value', state
endif
end subroutine apply_pert
!====================================================================
! set_printing_nb_i
!====================================================================
! routine to turn on print flag for selected location
!
subroutine set_printing_nb_i(blksz,xlon,xlat,print_i,print_nb)
implicit none
! intent (in)
integer, intent(in) :: blksz(:)
real(kind=kind_dbl_prec), intent(in) :: xlon(:,:)
real(kind=kind_dbl_prec), intent(in) :: xlat(:,:)
! intent (out)
integer, intent(out) :: print_i, print_nb
! local
integer :: nblks,nb,i
real, parameter :: plon_trunc = 114.9
real, parameter :: plat_trunc = -26.6
real, parameter :: delta = 1.
nblks = size(blksz)
print_i = -9
print_nb = -9
do nb = 1,nblks
do i = 1,blksz(nb)
if ( (xlon(nb,i)*57.29578 > plon_trunc) .and. (xlon(nb,i)*57.29578 < plon_trunc+delta ) .and. &
(xlat(nb,i)*57.29578 > plat_trunc ) .and. (xlat(nb,i)*57.29578 < plat_trunc+delta ) ) then
print_i=i
print_nb=nb
write(*,*) 'LNDP -print flag is on', xlon(nb,i)*57.29578, xlat(nb,i)*57.29578, nb, i
return
endif
enddo
enddo
end subroutine set_printing_nb_i
end module lndp_apply_perts_mod