[11395] | 1 | MODULE isfcav |
---|
| 2 | !!====================================================================== |
---|
[11541] | 3 | !! *** MODULE isfcav *** |
---|
| 4 | !! Ice shelf cavity module : update ice shelf melting under ice |
---|
| 5 | !! shelf |
---|
[11395] | 6 | !!====================================================================== |
---|
| 7 | !! History : 3.2 ! 2011-02 (C.Harris ) Original code isf cav |
---|
| 8 | !! 3.4 ! 2013-03 (P. Mathiot) Merging + parametrization |
---|
[11541] | 9 | !! 4.1 ! 2019-09 (P. Mathiot) Split ice shelf cavity and ice shelf parametrisation |
---|
[11395] | 10 | !!---------------------------------------------------------------------- |
---|
| 11 | |
---|
| 12 | !!---------------------------------------------------------------------- |
---|
[11541] | 13 | !! isf_cav : update ice shelf melting under ice shelf |
---|
[11395] | 14 | !!---------------------------------------------------------------------- |
---|
| 15 | USE oce ! ocean dynamics and tracers |
---|
[11541] | 16 | USE isf ! ice shelf public variables |
---|
[11844] | 17 | USE isfutils |
---|
[11541] | 18 | USE isftbl ! ice shelf top boundary layer properties |
---|
| 19 | USE isfcavmlt ! ice shelf melt formulation |
---|
| 20 | USE isfcavgam ! ice shelf melt exchange coeficient |
---|
| 21 | USE isfdiags ! ice shelf diags |
---|
[11395] | 22 | USE dom_oce ! ocean space and time domain |
---|
| 23 | USE phycst ! physical constants |
---|
[11423] | 24 | USE eosbn2 ! l_useCT |
---|
[11395] | 25 | ! |
---|
| 26 | USE in_out_manager ! I/O manager |
---|
| 27 | USE iom ! I/O library |
---|
| 28 | USE fldread ! read input field at current time step |
---|
[11541] | 29 | USE lbclnk ! lbclnk |
---|
[11395] | 30 | |
---|
| 31 | IMPLICIT NONE |
---|
| 32 | |
---|
| 33 | PRIVATE |
---|
| 34 | |
---|
| 35 | PUBLIC isf_cav, isf_cav_init ! routine called in isfmlt |
---|
| 36 | |
---|
| 37 | !!---------------------------------------------------------------------- |
---|
| 38 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
---|
| 39 | !! $Id: sbcisf.F90 10536 2019-01-16 19:21:09Z mathiot $ |
---|
| 40 | !! Software governed by the CeCILL license (see ./LICENSE) |
---|
| 41 | !!---------------------------------------------------------------------- |
---|
| 42 | CONTAINS |
---|
| 43 | |
---|
| 44 | SUBROUTINE isf_cav( kt, ptsc, pqfwf ) |
---|
| 45 | !!--------------------------------------------------------------------- |
---|
[11541] | 46 | !! *** ROUTINE isf_cav *** |
---|
[11395] | 47 | !! |
---|
| 48 | !! ** Purpose : handle surface boundary condition under ice shelf |
---|
| 49 | !! |
---|
[11541] | 50 | !! ** Method : based on Mathiot et al. (2017) |
---|
[11395] | 51 | !! |
---|
[11541] | 52 | !! ** Action : - compute geometry of the Losch top bournary layer (see Losch et al. 2008) |
---|
| 53 | !! - depending on the chooses option |
---|
| 54 | !! - compute temperature/salt in the tbl |
---|
| 55 | !! - compute exchange coeficient |
---|
| 56 | !! - compute heat and fwf fluxes |
---|
| 57 | !! - output |
---|
[11395] | 58 | !!--------------------------------------------------------------------- |
---|
| 59 | !!-------------------------- OUT -------------------------------------- |
---|
| 60 | REAL(wp), DIMENSION(jpi,jpj) , INTENT(inout) :: pqfwf |
---|
| 61 | REAL(wp), DIMENSION(jpi,jpj,jpts), INTENT(inout) :: ptsc |
---|
| 62 | !!-------------------------- IN -------------------------------------- |
---|
| 63 | INTEGER, INTENT(in) :: kt ! ocean time step |
---|
| 64 | !!--------------------------------------------------------------------- |
---|
| 65 | LOGICAL :: lit |
---|
| 66 | INTEGER :: nit |
---|
| 67 | REAL(wp) :: zerr |
---|
| 68 | REAL(wp), DIMENSION(jpi,jpj) :: zqlat, zqoce, zqhc, zqh |
---|
| 69 | REAL(wp), DIMENSION(jpi,jpj) :: zqoce_b |
---|
| 70 | REAL(wp), DIMENSION(jpi,jpj) :: zgammat, zgammas |
---|
| 71 | REAL(wp), DIMENSION(jpi,jpj) :: zttbl, zstbl |
---|
| 72 | !!--------------------------------------------------------------------- |
---|
| 73 | ! |
---|
| 74 | ! compute T/S/U/V for the top boundary layer |
---|
[11495] | 75 | CALL isf_tbl(tsn(:,:,:,jp_tem), zttbl(:,:),'T', misfkt_cav, rhisf_tbl_cav, misfkb_cav, rfrac_tbl_cav ) |
---|
| 76 | CALL isf_tbl(tsn(:,:,:,jp_sal), zstbl(:,:),'T', misfkt_cav, rhisf_tbl_cav, misfkb_cav, rfrac_tbl_cav ) |
---|
[11395] | 77 | ! |
---|
| 78 | ! output T/S/U/V for the top boundary layer |
---|
[11521] | 79 | CALL iom_put('ttbl_cav',zttbl(:,:) * mskisf_cav(:,:)) |
---|
| 80 | CALL iom_put('stbl' ,zstbl(:,:) * mskisf_cav(:,:)) |
---|
[11395] | 81 | ! |
---|
| 82 | ! initialisation |
---|
| 83 | IF (TRIM(cn_gammablk) == 'HJ99' ) zqoce_b (:,:) = ptsc(:,:,jp_tem) * rau0_rcp ! last time step total heat fluxes (to speed up convergence) |
---|
| 84 | ! |
---|
| 85 | ! compute ice shelf melting |
---|
| 86 | nit = 1 ; lit = .TRUE. |
---|
| 87 | DO WHILE ( lit ) ! maybe just a constant number of iteration as in blk_core is fine |
---|
| 88 | ! |
---|
| 89 | ! compute gammat every where (2d) |
---|
| 90 | ! useless if melt specified |
---|
| 91 | IF ( TRIM(cn_isfcav_mlt) .NE. 'spe' ) THEN |
---|
| 92 | CALL isfcav_gammats( zttbl, zstbl, zqoce , pqfwf, & |
---|
| 93 | & zgammat, zgammas ) |
---|
| 94 | END IF |
---|
| 95 | ! |
---|
| 96 | ! compute tfrz, latent heat and melt (2d) |
---|
| 97 | CALL isfcav_mlt(kt, zgammat, zgammas, zttbl, zstbl, & |
---|
| 98 | & zqhc , zqoce, pqfwf ) |
---|
| 99 | ! |
---|
| 100 | ! define if we need to iterate (nn_gammablk 0/1 do not need iteration) |
---|
| 101 | SELECT CASE ( cn_gammablk ) |
---|
| 102 | CASE ( 'spe','ad15' ) |
---|
| 103 | ! no convergence needed |
---|
| 104 | lit = .FALSE. |
---|
| 105 | CASE ( 'hj99' ) |
---|
| 106 | ! compute error between 2 iterations |
---|
| 107 | zerr = MAXVAL(ABS(zqoce(:,:) - zqoce_b(:,:))) |
---|
| 108 | ! |
---|
| 109 | ! define if iteration needed |
---|
| 110 | IF (nit >= 100) THEN ! too much iteration |
---|
| 111 | CALL ctl_stop( 'STOP', 'isf_cav: HJ99 gamma formulation had too many iterations ...' ) |
---|
| 112 | ELSE IF ( zerr <= 0.01_wp ) THEN ! convergence is achieve |
---|
| 113 | lit = .FALSE. |
---|
| 114 | ELSE ! converge is not yet achieve |
---|
| 115 | nit = nit + 1 |
---|
| 116 | zqoce_b(:,:) = zqoce(:,:) |
---|
| 117 | END IF |
---|
| 118 | END SELECT |
---|
[11541] | 119 | ! |
---|
[11395] | 120 | END DO |
---|
| 121 | ! |
---|
| 122 | ! compute heat and water flux (change signe directly in the melt subroutine) |
---|
| 123 | pqfwf(:,:) = pqfwf(:,:) * mskisf_cav(:,:) |
---|
| 124 | zqoce(:,:) = zqoce(:,:) * mskisf_cav(:,:) |
---|
| 125 | zqhc (:,:) = zqhc(:,:) * mskisf_cav(:,:) |
---|
| 126 | ! |
---|
| 127 | ! compute heat content flux |
---|
| 128 | zqlat(:,:) = - pqfwf(:,:) * rLfusisf ! 2d latent heat flux (W/m2) ( > 0 out ) |
---|
| 129 | ! |
---|
| 130 | ! total heat flux ( >0 out ) |
---|
| 131 | zqh(:,:) = ( zqhc (:,:) + zqoce(:,:) ) |
---|
| 132 | ! |
---|
| 133 | ! lbclnk on melt |
---|
| 134 | CALL lbc_lnk_multi( 'isfmlt', zqh, 'T', 1., pqfwf, 'T', 1.) |
---|
| 135 | ! |
---|
| 136 | ! output fluxes |
---|
| 137 | CALL isf_diags_flx( misfkt_cav, misfkb_cav, rhisf_tbl_cav, rfrac_tbl_cav, 'cav', pqfwf, zqoce, zqlat, zqhc) |
---|
| 138 | ! |
---|
| 139 | ! set temperature content |
---|
| 140 | ptsc(:,:,jp_tem) = - zqh(:,:) * r1_rau0_rcp |
---|
| 141 | ! |
---|
[11844] | 142 | IF ( ln_isfdebug ) THEN |
---|
| 143 | CALL debug('isf_cav: ptsc T',ptsc(:,:,1)) |
---|
| 144 | CALL debug('isf_cav: ptsc S',ptsc(:,:,2)) |
---|
| 145 | CALL debug('isf_cav: pqfwf fwf',pqfwf(:,:)) |
---|
| 146 | END IF |
---|
| 147 | ! |
---|
[11395] | 148 | END SUBROUTINE isf_cav |
---|
| 149 | |
---|
| 150 | SUBROUTINE isf_cav_init |
---|
| 151 | !!--------------------------------------------------------------------- |
---|
[11541] | 152 | !! *** ROUTINE isf_cav_init *** |
---|
[11395] | 153 | !! |
---|
[11541] | 154 | !! ** Purpose : initialisation of variable needed to compute melt under an ice shelf |
---|
[11395] | 155 | !! |
---|
| 156 | !!---------------------------------------------------------------------- |
---|
| 157 | INTEGER :: ierr |
---|
| 158 | !!--------------------------------------------------------------------- |
---|
| 159 | |
---|
| 160 | ! allocation isfcav gamtisf, gamsisf, |
---|
| 161 | CALL isf_alloc_cav() |
---|
| 162 | ! |
---|
[11403] | 163 | ! cav |
---|
[11495] | 164 | misfkt_cav(:,:) = mikt(:,:) ; misfkb_cav(:,:) = 1 |
---|
| 165 | rhisf_tbl_cav(:,:) = 0.0_wp ; rfrac_tbl_cav(:,:) = 0.0_wp |
---|
[11395] | 166 | ! |
---|
| 167 | SELECT CASE ( TRIM(cn_isfcav_mlt) ) |
---|
| 168 | CASE( 'spe' ) |
---|
| 169 | |
---|
| 170 | ALLOCATE( sf_isfcav_fwf(1), STAT=ierr ) |
---|
| 171 | ALLOCATE( sf_isfcav_fwf(1)%fnow(jpi,jpj,1), sf_isfcav_fwf(1)%fdta(jpi,jpj,1,2) ) |
---|
[11423] | 172 | CALL fld_fill( sf_isfcav_fwf, (/ sn_isfcav_fwf /), cn_isfdir, 'isf_cav_init', 'read fresh water flux isf data', 'namisf' ) |
---|
[11395] | 173 | |
---|
| 174 | IF(lwp) WRITE(numout,*) |
---|
| 175 | IF(lwp) WRITE(numout,*) ' ==>> The ice shelf melt inside the cavity is read from forcing files' |
---|
| 176 | |
---|
| 177 | CASE( '2eq' ) |
---|
| 178 | IF(lwp) WRITE(numout,*) |
---|
| 179 | IF(lwp) WRITE(numout,*) ' ==>> The original ISOMIP melt formulation is used to compute melt under the ice shelves' |
---|
| 180 | |
---|
| 181 | CASE( '3eq' ) |
---|
| 182 | ! coeficient for linearisation of potential tfreez |
---|
| 183 | ! Crude approximation for pressure (but commonly used) |
---|
| 184 | IF ( l_useCT ) THEN ! linearisation from Jourdain et al. (2017) |
---|
| 185 | risf_lamb1 =-0.0564_wp |
---|
| 186 | risf_lamb2 = 0.0773_wp |
---|
| 187 | risf_lamb3 =-7.8633e-8 * grav * rau0 |
---|
| 188 | ELSE ! linearisation from table 4 (Asay-Davis et al., 2015) |
---|
| 189 | risf_lamb1 =-0.0573_wp |
---|
| 190 | risf_lamb2 = 0.0832_wp |
---|
| 191 | risf_lamb3 =-7.5300e-8 * grav * rau0 |
---|
| 192 | ENDIF |
---|
| 193 | |
---|
| 194 | IF(lwp) WRITE(numout,*) |
---|
| 195 | IF(lwp) WRITE(numout,*) ' ==>> The 3 equations melt formulation is used to compute melt under the ice shelves' |
---|
| 196 | |
---|
| 197 | CASE DEFAULT |
---|
| 198 | CALL ctl_stop(' cn_isfcav_mlt method unknown (spe, 2eq, 3eq), check namelist') |
---|
| 199 | END SELECT |
---|
| 200 | ! |
---|
[11553] | 201 | ! compute mask |
---|
| 202 | mskisf_cav(:,:) = (1._wp - tmask(:,:,1)) * ssmask(:,:) |
---|
| 203 | ! |
---|
[11395] | 204 | END SUBROUTINE isf_cav_init |
---|
| 205 | |
---|
| 206 | END MODULE isfcav |
---|