223 lines
11 KiB
Fortran
Executable File
223 lines
11 KiB
Fortran
Executable File
MODULE usrdef_sbc
|
|
!!======================================================================
|
|
!! *** MODULE usrdef_sbc ***
|
|
!!
|
|
!! === ICE_RHEO configuration ===
|
|
!!
|
|
!! User defined : surface forcing of a user configuration
|
|
!!======================================================================
|
|
!! History : 4.0 ! 2016-03 (S. Flavoni, G. Madec) user defined interface
|
|
!!----------------------------------------------------------------------
|
|
|
|
!!----------------------------------------------------------------------
|
|
!! usr_def_sbc : user defined surface bounday conditions in ICE_RHEO case
|
|
!!----------------------------------------------------------------------
|
|
USE oce ! ocean dynamics and tracers
|
|
USE dom_oce ! ocean space and time domain
|
|
USE sbc_oce ! Surface boundary condition: ocean fields
|
|
USE sbc_ice ! Surface boundary condition: ice fields
|
|
USE phycst ! physical constants
|
|
USE ice, ONLY : at_i_b, a_i_b, at_i, u_ice, v_ice
|
|
USE icethd_dh ! for CALL ice_thd_snwblow
|
|
USE sbc_phy, ONLY : pp_cldf
|
|
!
|
|
USE in_out_manager ! I/O manager
|
|
USE lib_mpp ! distribued memory computing library
|
|
USE lbclnk ! ocean lateral boundary conditions (or mpp link)
|
|
USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
|
|
|
|
IMPLICIT NONE
|
|
PRIVATE
|
|
|
|
PUBLIC usrdef_sbc_oce ! routine called by sbcmod.F90 for sbc ocean
|
|
PUBLIC usrdef_sbc_ice_tau ! routine called by icestp.F90 for ice dynamics
|
|
PUBLIC usrdef_sbc_ice_flx ! routine called by icestp.F90 for ice thermo
|
|
|
|
!! * Substitutions
|
|
# include "do_loop_substitute.h90"
|
|
!!----------------------------------------------------------------------
|
|
!! NEMO/OCE 4.0 , NEMO Consortium (2018)
|
|
!! $Id: usrdef_sbc.F90 10074 2018-08-28 16:15:49Z nicolasmartin $
|
|
!! Software governed by the CeCILL license (see ./LICENSE)
|
|
!!----------------------------------------------------------------------
|
|
CONTAINS
|
|
|
|
SUBROUTINE usrdef_sbc_oce( kt, Kbb )
|
|
!!---------------------------------------------------------------------
|
|
!! *** ROUTINE usr_def_sbc ***
|
|
!!
|
|
!! ** Purpose : provide at each time-step the surface boundary
|
|
!! condition, i.e. the momentum, heat and freshwater fluxes.
|
|
!!
|
|
!! ** Method : all 0 fields, for ICE_RHEO case
|
|
!! CAUTION : never mask the surface stress field !
|
|
!!
|
|
!! ** Action : - set to ZERO all the ocean surface boundary condition, i.e.
|
|
!! utau, vtau, taum, wndm, qns, qsr, emp, sfx
|
|
!!
|
|
!!----------------------------------------------------------------------
|
|
INTEGER, INTENT(in) :: kt ! ocean time step
|
|
INTEGER, INTENT(in) :: Kbb ! ocean time index
|
|
INTEGER :: ij0, ij1, ii0, ii1, jj, ji ! loop indices
|
|
REAL(wp) :: zrhoco ! ocean density and drag coefficient product
|
|
!!---------------------------------------------------------------------
|
|
!
|
|
IF( kt == nit000 ) THEN
|
|
!
|
|
!IF(lwp) WRITE(numout,*)' usrdef_sbc_oce : ICE_RHEO case: ocean boudary conditions'
|
|
|
|
utau(:,:) = 0._wp
|
|
utau(:,:) = 0._wp
|
|
|
|
!ij0 = 1 ; ij1 = 25 ! set boundary condition
|
|
!ii0 = 975 ; ii1 = 1000
|
|
!DO jj = mj0(ij0), mj1(ij1)
|
|
! DO ji = mi0(ii0), mi1(ii1)
|
|
! utau(ji,jj) = -utau_ice(ji,jj)
|
|
! vtau(ji,jj) = -vtau_ice(ji,jj)
|
|
! END DO
|
|
!END DO
|
|
|
|
taum(:,:) = 0._wp ! assume these are not used
|
|
wndm(:,:) = 0._wp
|
|
!
|
|
emp (:,:) = 0._wp
|
|
sfx (:,:) = 0._wp
|
|
qns (:,:) = 0._wp
|
|
qsr (:,:) = 0._wp
|
|
!
|
|
utau_b(:,:) = 0._wp
|
|
vtau_b(:,:) = 0._wp
|
|
emp_b (:,:) = 0._wp
|
|
sfx_b (:,:) = 0._wp
|
|
qns_b (:,:) = 0._wp
|
|
!
|
|
ENDIF
|
|
!
|
|
END SUBROUTINE usrdef_sbc_oce
|
|
|
|
SUBROUTINE usrdef_sbc_ice_tau( kt )
|
|
!!---------------------------------------------------------------------
|
|
!! *** ROUTINE usrdef_sbc_ice_tau ***
|
|
!!
|
|
!! ** Purpose : provide the surface boundary (momentum) condition over
|
|
!sea-ice
|
|
!!---------------------------------------------------------------------
|
|
INTEGER, INTENT(in) :: kt ! ocean time step
|
|
INTEGER :: jj, ji ! loop indices
|
|
|
|
REAL(wp) :: zwndi_f , zwndj_f, zwnorm_f ! relative wind module and components at F-point
|
|
REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
|
|
REAL(wp), DIMENSION(jpi,jpj) :: windu, windv ! wind components (idealised forcing)
|
|
REAL(wp), PARAMETER :: r_vfac = 1._wp ! relative velocity (make 0 for absolute velocity)
|
|
REAL(wp), PARAMETER :: Rwind = -0.8_wp ! ratio of wind components
|
|
REAL(wp), PARAMETER :: Umax = 15._wp ! maximum wind speed (m/s)
|
|
REAL(wp), PARAMETER :: d = 2000._wp ! size of the domain (km)
|
|
REAL(wp), PARAMETER :: res = 2._wp ! gridcell size
|
|
REAL(wp), PARAMETER :: zrhoa = 1.22 ! Air density kg/m3
|
|
REAL(wp), PARAMETER :: Cd_atm = 1.4e-3 ! transfer coefficient over ice
|
|
!!---------------------------------------------------------------------
|
|
! extra code for test case
|
|
IF( kt==nit000 .AND. lwp) WRITE(numout,*)' usrdef_sbc_ice : ICE_RHEO case: analytical stress forcing'
|
|
|
|
DO_2D( 0, 0, 0, 0 )
|
|
! wind spins up over 6 hours, factor 1000 to balance the units
|
|
windu(ji,jj) = Umax/sqrt(d*1000)*(d-2*mig(ji)*res)/((d-2*mig(ji)*res)**2+(d-2*mjg(jj)*res)**2*Rwind**2)**(1/4)*min(kt*30./21600,1.)
|
|
windv(ji,jj) = Umax/sqrt(d*1000)*(d-2*mjg(jj)*res)/((d-2*mig(ji)*res)**2+(d-2*mjg(jj)*res)**2*Rwind**2)**(1/4)*Rwind*min(kt*30./21600,1.)
|
|
END_2D
|
|
CALL lbc_lnk( 'usrdef_sbc', windu, 'U', -1._wp, windv, 'V', -1._wp )
|
|
|
|
wndm_ice(:,:) = 0._wp !!gm brutal....
|
|
|
|
! ------------------------------------------------------------ !
|
|
! Wind module relative to the moving ice ( U10m - U_ice ) !
|
|
! ------------------------------------------------------------ !
|
|
! C-grid ice dynamics : U & V-points (same as ocean)
|
|
DO_2D( 0, 0, 0, 0 )
|
|
zwndi_t = ( windu(ji,jj) - r_vfac * 0.5 * ( u_ice(ji-1,jj ) + u_ice(ji,jj) ) )
|
|
zwndj_t = ( windv(ji,jj) - r_vfac * 0.5 * ( v_ice(ji,jj-1) + v_ice(ji,jj) ) )
|
|
wndm_ice(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
|
|
END_2D
|
|
CALL lbc_lnk( 'usrdef_sbc', wndm_ice, 'T', 1._wp )
|
|
|
|
!!gm brutal....
|
|
utau_ice (:,:) = 0._wp
|
|
vtau_ice (:,:) = 0._wp
|
|
!!gm end
|
|
|
|
! ------------------------------------------------------------ !
|
|
! Wind stress relative to the moving ice ( U10m - U_ice ) !
|
|
! ------------------------------------------------------------ !
|
|
! C-grid ice dynamics : U & V-points (same as ocean)
|
|
DO_2D( 0, 0, 0, 0 )
|
|
utau_ice(ji,jj) = 0.5 * zrhoa * Cd_atm * ( wndm_ice(ji+1,jj ) + wndm_ice(ji,jj) ) &
|
|
& * ( 0.5 * (windu(ji+1,jj) + windu(ji,jj) ) - r_vfac * u_ice(ji,jj) )
|
|
vtau_ice(ji,jj) = 0.5 * zrhoa * Cd_atm * ( wndm_ice(ji,jj+1 ) + wndm_ice(ji,jj) ) &
|
|
& * ( 0.5 * (windv(ji,jj+1) + windv(ji,jj) ) - r_vfac * v_ice(ji,jj) )
|
|
END_2D
|
|
CALL lbc_lnk( 'usrdef_sbc', utau_ice, 'U', -1._wp, vtau_ice, 'V', -1._wp )
|
|
!
|
|
END SUBROUTINE usrdef_sbc_ice_tau
|
|
|
|
SUBROUTINE usrdef_sbc_ice_flx( kt, phs, phi )
|
|
!!---------------------------------------------------------------------
|
|
!! *** ROUTINE usrdef_sbc_ice_flx ***
|
|
!!
|
|
!! ** Purpose : provide the surface boundary (flux) condition over sea-ice
|
|
!!---------------------------------------------------------------------
|
|
INTEGER, INTENT(in) :: kt ! ocean time step
|
|
REAL(wp), DIMENSION(:,:,:), INTENT(in) :: phs ! snow thickness
|
|
REAL(wp), DIMENSION(:,:,:), INTENT(in) :: phi ! ice thickness
|
|
!!
|
|
REAL(wp) :: zfr1, zfr2 ! local variables
|
|
REAL(wp), DIMENSION(jpi,jpj) :: zsnw ! snw distribution after wind blowing
|
|
!!---------------------------------------------------------------------
|
|
!
|
|
IF( kt==nit000 .AND. lwp) WRITE(numout,*)' usrdef_sbc_ice : ICE_RHEO case: NO flux forcing'
|
|
!
|
|
! ocean variables (renaming)
|
|
emp_oce (:,:) = 0._wp ! uniform value for freshwater budget (E-P)
|
|
qsr_oce (:,:) = 0._wp ! uniform value for solar radiation
|
|
qns_oce (:,:) = 0._wp ! uniform value for non-solar heat flux
|
|
|
|
! ice variables
|
|
alb_ice (:,:,:) = 0.7_wp ! useless
|
|
qsr_ice (:,:,:) = 0._wp ! uniform value for solar radiation
|
|
qns_ice (:,:,:) = 0._wp ! uniform value for non-solar heat flux
|
|
dqns_ice(:,:,:) = 0._wp ! uniform value for non solar heat flux sensitivity for ice
|
|
sprecip (:,:) = 0._wp ! uniform value for snow precip
|
|
evap_ice(:,:,:) = 0._wp ! uniform value for sublimation
|
|
|
|
! ice fields deduced from above
|
|
zsnw(:,:) = 1._wp
|
|
!!CALL lim_thd_snwblow( at_i_b, zsnw ) ! snow distribution over ice after wind blowing
|
|
emp_ice (:,:) = SUM( a_i_b(:,:,:) * evap_ice(:,:,:), dim=3 ) - sprecip(:,:) * zsnw(:,:)
|
|
emp_oce (:,:) = emp_oce(:,:) - sprecip(:,:) * (1._wp - zsnw(:,:) )
|
|
qevap_ice(:,:,:) = 0._wp
|
|
qprec_ice(:,:) = rhos * ( sst_m(:,:) * rcpi - rLfus ) * tmask(:,:,1) ! in J/m3
|
|
qemp_oce (:,:) = - emp_oce(:,:) * sst_m(:,:) * rcp
|
|
qemp_ice (:,:) = sprecip(:,:) * zsnw * ( sst_m(:,:) * rcpi - rLfus ) * tmask(:,:,1) ! solid precip (only)
|
|
|
|
! total fluxes
|
|
emp_tot (:,:) = emp_ice + emp_oce
|
|
qns_tot (:,:) = at_i_b(:,:) * qns_oce(:,:) + SUM( a_i_b(:,:,:) * qns_ice(:,:,:), dim=3 ) + qemp_ice(:,:) + qemp_oce(:,:)
|
|
qsr_tot (:,:) = at_i_b(:,:) * qsr_oce(:,:) + SUM( a_i_b(:,:,:) * qsr_ice(:,:,:), dim=3 )
|
|
|
|
! --- shortwave radiation transmitted below the surface (W/m2, see Grenfell Maykut 77) --- !
|
|
zfr1 = ( 0.18 * ( 1.0 - pp_cldf ) + 0.35 * pp_cldf ) ! transmission when hi>10cm
|
|
zfr2 = ( 0.82 * ( 1.0 - pp_cldf ) + 0.65 * pp_cldf ) ! zfr2 such that zfr1 + zfr2 to equal 1
|
|
!
|
|
WHERE ( phs(:,:,:) <= 0._wp .AND. phi(:,:,:) < 0.1_wp ) ! linear decrease from hi=0 to 10cm
|
|
qtr_ice_top(:,:,:) = qsr_ice(:,:,:) * ( zfr1 + zfr2 * ( 1._wp - phi(:,:,:) * 10._wp ) )
|
|
ELSEWHERE( phs(:,:,:) <= 0._wp .AND. phi(:,:,:) >= 0.1_wp ) ! constant (zfr1) when hi>10cm
|
|
qtr_ice_top(:,:,:) = qsr_ice(:,:,:) * zfr1
|
|
ELSEWHERE ! zero when hs>0
|
|
qtr_ice_top(:,:,:) = 0._wp
|
|
END WHERE
|
|
|
|
END SUBROUTINE usrdef_sbc_ice_flx
|
|
|
|
|
|
!!======================================================================
|
|
END MODULE usrdef_sbc
|