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 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 "vectopt_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 ) !!--------------------------------------------------------------------- !! *** 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 :: 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 jj = 2, jpjm1 DO ji = 2, jpim1 ! 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 DO END DO CALL lbc_lnk_multi( 'usrdef_sbc', windu, 'U', -1., windv, 'V', -1. ) 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 jj = 2, jpjm1 DO ji = 2, jpim1 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 DO END DO CALL lbc_lnk( 'usrdef_sbc', wndm_ice, 'T', 1. ) !!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 jj = 2, jpjm1 DO ji = 2, jpim1 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 DO END DO CALL lbc_lnk_multi( 'usrdef_sbc', utau_ice, 'U', -1., vtau_ice, 'V', -1. ) ! 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 radiation ! 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 radiation 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 - cldf_ice ) + 0.35 * cldf_ice ) ! transmission when hi>10cm zfr2 = ( 0.82 * ( 1.0 - cldf_ice ) + 0.65 * cldf_ice ) ! 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