- Timestamp:
- 2019-08-05T19:14:52+02:00 (5 years ago)
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NEMO/branches/2019/ENHANCE-02_ISF_nemo/src/OCE/ISF/isfcavmlt.F90
r11395 r11403 12 12 !!---------------------------------------------------------------------- 13 13 USE oce ! ocean dynamics and tracers 14 USE isf 15 USE isfdiags 14 USE isf ! ice shelf public variables 16 15 USE dom_oce ! ocean space and time domain 17 16 USE phycst ! physical constants 18 17 USE eosbn2 ! equation of state 19 USE zdfdrg ! vertical physics: top/bottom drag coef.20 18 ! 21 19 USE in_out_manager ! I/O manager 22 20 USE iom ! I/O library 23 21 USE fldread ! read input field at current time step 24 USE l bclnk !22 USE lib_fortran 25 23 26 24 IMPLICIT NONE … … 40 38 ! ------------------------------------------------------------------------------------------------------- 41 39 42 SUBROUTINE isfcav_mlt(kt, pgt, pgs , pttbl, pstbl, 43 & pqhc, pqoce, pqfwf 44 !!---------------------------------------------------------------------- 45 !! ** Purpose :46 !! 47 !! ** Method :48 !!--------------------------------------------------------------------- 49 !!-------------------------- OUT ------------------------------------- 50 REAL(wp), DIMENSION(jpi,jpj), INTENT( inout) :: pqhc, pqoce, pqfwf ! heat and fwf fluxes40 SUBROUTINE isfcav_mlt(kt, pgt, pgs , pttbl, pstbl, & 41 & pqhc, pqoce, pqfwf ) 42 !!---------------------------------------------------------------------- 43 !! 44 !! ** Purpose : compute ice shelf fwf/heqt fluxes 45 !! 46 !!--------------------------------------------------------------------- 47 !!-------------------------- OUT ------------------------------------- 48 REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat and fwf fluxes 51 49 !!-------------------------- IN ------------------------------------- 52 50 INTEGER, INTENT(in) :: kt … … 59 57 SELECT CASE ( cn_isfcav_mlt ) 60 58 CASE ( 'spe' ) ! ice shelf melt specified (read input file, and heat fluxes derived from 61 CALL isfmlt_spe( kt, pstbl, 62 & pqhc, pqoce, pqfwf 59 CALL isfmlt_spe( kt, pstbl, & 60 & pqhc, pqoce, pqfwf ) 63 61 CASE ( '2eq' ) ! ISOMIP formulation (2 equations) for volume flux (Hunter et al., 2006) 64 CALL isfmlt_2eq( pgt, pttbl, pstbl, 65 & pqhc , pqoce, pqfwf 62 CALL isfmlt_2eq( pgt, pttbl, pstbl, & 63 & pqhc , pqoce, pqfwf ) 66 64 CASE ( '3eq' ) ! ISOMIP+ formulation (3 equations) for volume flux (Asay-Davis et al., 2015) 67 CALL isfmlt_3eq( pgt, pgs , pttbl, pstbl, 68 & pqhc, pqoce, pqfwf 65 CALL isfmlt_3eq( pgt, pgs , pttbl, pstbl, & 66 & pqhc, pqoce, pqfwf ) 69 67 CASE ( 'oasis' ) ! fwf pass trough oasis 70 !CALL isfmlt_oasis( kt, pstbl,&71 ! & zqhc, zqoce, pqfwf )68 CALL isfmlt_oasis( kt, pstbl, & 69 & pqhc, pqoce, pqfwf ) 72 70 CASE DEFAULT 73 71 CALL ctl_stop('STOP', 'unknown isf melt formulation : cn_isfcav (should not see this)') … … 80 78 ! ------------------------------------------------------------------------------------------------------- 81 79 82 SUBROUTINE isfmlt_spe(kt, pstbl, 83 & pqhc, pqoce, pqfwf) ! ==>> out84 !!---------------------------------------------------------------------- 85 !! ** Purpose : 86 !! 87 !! ** Method :88 !!--------------------------------------------------------------------- 89 !!-------------------------- OUT ------------------------------------- 90 REAL(wp), DIMENSION(jpi,jpj), INTENT( inout) :: pqhc, pqoce, pqfwf ! heat content, latent heat and fwf fluxes91 !!-------------------------- IN ------------------------------------- 92 INTEGER , INTENT(in ) :: kt 93 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pstbl ! salinity in top boundary layer94 !!-------------------------------------------------------------------- 95 REAL(wp), DIMENSION(jpi,jpj) :: ztfrz !freezing temperature80 SUBROUTINE isfmlt_spe(kt, pstbl, & ! <<== in 81 & pqhc , pqoce, pqfwf ) ! ==>> out 82 !!---------------------------------------------------------------------- 83 !! ** Purpose : - read ice shelf melt from forcing file 84 !! - compute ocea-ice heat flux (assuming it is equal to latent heat) 85 !! - compute heat content flux 86 !!--------------------------------------------------------------------- 87 !!-------------------------- OUT ------------------------------------- 88 REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat content, latent heat and fwf fluxes 89 !!-------------------------- IN ------------------------------------- 90 INTEGER , INTENT(in ) :: kt ! current time step 91 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pstbl ! salinity in tbl 92 !!-------------------------------------------------------------------- 93 REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! tbl freezing temperature 96 94 !!-------------------------------------------------------------------- 97 95 ! … … 103 101 ! 104 102 ! define fwf and qoce 105 pqfwf(:,:) = -sf_isfcav_fwf(1)%fnow(:,:,1) ! fwf106 103 ! ocean heat flux is assume to be equal to the latent heat 107 pqoce(:,:) = pqfwf(:,:) * rLfusisf ! ocean heat flux 108 pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux 104 pqfwf(:,:) = - sf_isfcav_fwf(1)%fnow(:,:,1) ! fwf ( >0 out) 105 pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocean heat flux ( >0 out) 106 pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( >0 out) 109 107 ! 110 108 END SUBROUTINE isfmlt_spe 111 109 112 SUBROUTINE isfmlt_2eq(pgt, pttbl, pstbl, & ! <<== in 113 & pqhc , pqoce, pqfwf ) ! ==>> out 114 !!---------------------------------------------------------------------- 115 !! ** Purpose : 116 !! 117 !! ** Method : 118 !!--------------------------------------------------------------------- 119 !!-------------------------- OUT ------------------------------------- 120 REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pqhc, pqoce, pqfwf ! hean content, ocean-ice heat and fwf fluxes 110 SUBROUTINE isfmlt_2eq(pgt, pttbl, pstbl, & ! <<== in 111 & pqhc , pqoce, pqfwf ) ! ==>> out 112 !!---------------------------------------------------------------------- 113 !! ** Purpose : Compute ice shelf fwf/heqt fluxes using ISOMIP formulation (Hunter et al., 2006) 114 !! 115 !! ** Method : The ice shelf melt latent heat is defined as being equal to the ocean/ice heat flux. 116 !! From this we can derived the fwf, ocean/ice heat flux and the heat content flux as being : 117 !! qfwf = Gammat * Rau0 * Cp * ( Tw - Tfrz ) / Lf 118 !! qhoce = qlat 119 !! qhc = qfwf * Cp * Tfrz 120 !! 121 !! ** Reference : Hunter, J. R.: Specification for test models of ice shelf cavities, 122 !! Tech. Rep. June, Antarctic Climate & Ecosystems Cooperative Research Centre, available at: 123 !! http://staff.acecrc.org.au/~bkgalton/ISOMIP/test_cavities.pdf (last access: 21 July 2016), 2006. 124 !!--------------------------------------------------------------------- 125 !!-------------------------- OUT ------------------------------------- 126 REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! hean content, ocean-ice heat and fwf fluxes 121 127 !!-------------------------- IN ------------------------------------- 122 128 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pgt ! temperature exchange coeficient … … 124 130 !!-------------------------------------------------------------------- 125 131 REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! freezing temperature 132 REAL(wp), DIMENSION(jpi,jpj) :: zthd ! thermal driving 126 133 !!-------------------------------------------------------------------- 127 134 ! … … 129 136 CALL eos_fzp( pstbl(:,:), ztfrz(:,:), risfdep(:,:) ) 130 137 ! 138 ! thermal driving 139 zthd (:,:) = pttbl(:,:) - ztfrz(:,:) 140 ! 131 141 ! compute ocean-ice heat flux and then derive fwf assuming that ocean heat flux equal latent heat 132 pqfwf(:,:) = - pgt(:,:) * rau0_rcp * ( pttbl(:,:)-ztfrz(:,:) ) * r1_Lfusisf ! fresh water flux( > 0 out )133 pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocea-ice flux (assume to be equal to latent heat flux)( > 0 out )134 pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp 142 pqfwf(:,:) = - pgt(:,:) * rau0_rcp * zthd(:,:) * r1_Lfusisf ! fresh water flux ( > 0 out ) 143 pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocea-ice flux ( > 0 out ) 144 pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( > 0 out ) 135 145 ! 136 146 ! output thermal driving 137 CALL iom_put('isfthermald_cav', ( pttbl(:,:)-ztfrz(:,:) ))147 CALL iom_put('isfthermald_cav', zthd ) 138 148 ! 139 149 END SUBROUTINE isfmlt_2eq 140 150 141 SUBROUTINE isfmlt_3eq(pgt, pgs , pttbl, pstbl, & 142 & pqhc, pqoce, pqfwf ) 143 !!---------------------------------------------------------------------- 144 !! ** Purpose : 145 !! 146 !! ** Method : 147 !!--------------------------------------------------------------------- 148 !!-------------------------- OUT ------------------------------------- 149 REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pqhc, pqoce, pqfwf ! latent heat and fwf fluxes 150 !!-------------------------- IN ------------------------------------- 151 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pgt , pgs ! temperature exchange coeficient 152 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pttbl, pstbl ! temperature and salinity in top boundary layer 153 !!-------------------------------------------------------------------- 154 REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7 155 REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac 151 SUBROUTINE isfmlt_3eq(pgt, pgs , pttbl, pstbl, & 152 & pqhc, pqoce, pqfwf ) 153 !!---------------------------------------------------------------------- 154 !! ** Purpose : Compute ice shelf fwf/heqt fluxes using the 3 equation formulation 155 !! 156 !! ** Method : The melt rate is determined considering the heat balance, the salt balance 157 !! at the phase change interface and a linearisation of the equation of state. 158 !! 159 !! ** Reference : - Holland, D. M. and Jenkins, A., 160 !! Modeling Thermodynamic Ice-Ocean Interactions at the Base of an Ice Shelf, 161 !! J. Phys. Oceanogr., 29, 1999. 162 !! - Asay-Davis, X. S., Cornford, S. L., Durand, G., Galton-Fenzi, B. K., Gladstone, 163 !! R. M., Gudmundsson, G. H., Hattermann, T., Holland, D. M., Holland, D., Holland, 164 !! P. R., Martin, D. F., Mathiot, P., Pattyn, F., and Seroussi, H.: 165 !! Experimental design for three interrelated marine ice sheet and ocean model intercomparison projects: 166 !! MISMIP v. 3 (MISMIP +), ISOMIP v. 2 (ISOMIP +) and MISOMIP v. 1 (MISOMIP1), 167 !! Geosci. Model Dev., 9, 2471-2497, https://doi.org/10.5194/gmd-9-2471-2016, 2016. 168 !!--------------------------------------------------------------------- 169 !!-------------------------- OUT ------------------------------------- 170 REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! latent heat and fwf fluxes 171 !!-------------------------- IN ------------------------------------- 172 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pgt , pgs ! heat/salt exchange coeficient 173 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pttbl, pstbl ! mean temperature and salinity in top boundary layer 174 !!-------------------------------------------------------------------- 175 REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7 ! dummy local scalar for quadratic equation resolution 176 REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac ! dummy local scalar for quadratic equation resolution 156 177 REAL(wp) :: zeps = 1.e-20 157 REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! freezing point 158 REAL(wp), DIMENSION(jpi,jpj) :: zqcon ! conductive flux through the ice shelf 178 REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! freezing point 179 REAL(wp), DIMENSION(jpi,jpj) :: zqcon ! conductive flux through the ice shelf 180 REAL(wp), DIMENSION(jpi,jpj) :: zthd ! thermal driving 159 181 ! 160 182 INTEGER :: ji, jj ! dummy loop indices … … 162 184 ! 163 185 ! compute upward heat flux zhtflx and upward water flux zwflx 164 ! Resolution of a 2d equation from equation 24, 25 and 26186 ! Resolution of a 3d equation from equation 24, 25 and 26 (note conduction through the ice has been added to Eq 24) 165 187 DO jj = 1, jpj 166 188 DO ji = 1, jpi … … 188 210 ztfrz(ji,jj) = zeps4 + risf_lamb1 * zsfrz 189 211 ! 212 ! thermal driving 213 zthd(ji,jj) = pttbl(ji,jj) - ztfrz(ji,jj) 214 ! 190 215 ! compute the upward water and heat flux (eq. 24 and eq. 26) 191 ! ocean heat content flux added later on.192 pq fwf(ji,jj) = rau0 * pgs(ji,jj) * ( zsfrz - pstbl(ji,jj) ) / MAX(zsfrz,zeps) ! fresh waterflux (> 0 out)193 pq oce(ji,jj) = pgt(ji,jj) * rau0_rcp * ( pttbl(ji,jj) - ztfrz(ji,jj) ) ! ocean-ice heatflux (> 0 out)194 pqhc (ji,jj) = pqfwf(ji,jj) * ztfrz(ji,jj) * rcp ! heat content flux (> 0 out)195 zqcon(ji,jj) = zeps3 * ( ztfrz(ji,jj) - rtsurf ) ! to be check216 pqfwf(ji,jj) = rau0 * pgs(ji,jj) * ( zsfrz - pstbl(ji,jj) ) / MAX(zsfrz,zeps) ! fresh water flux (> 0 out) 217 pqoce(ji,jj) = rau0_rcp * pgt(ji,jj) * zthd (ji,jj) ! ocean-ice heat flux (> 0 out) 218 pqhc (ji,jj) = rcp * pqfwf(ji,jj) * ztfrz(ji,jj) ! heat content flux (> 0 out) 219 ! 220 zqcon(ji,jj) = zeps3 * ( ztfrz(ji,jj) - rtsurf ) ! conductive flux through the ice (> 0 out) 196 221 ! 197 222 END DO … … 202 227 ! 203 228 ! output thermal driving 204 CALL iom_put('isfthermald_cav', ( pttbl(:,:) - ztfrz(:,:) ))229 CALL iom_put('isfthermald_cav', zthd) 205 230 ! 206 231 END SUBROUTINE isfmlt_3eq 232 233 SUBROUTINE isfmlt_oasis(kt, pstbl, & ! <<== in 234 & pqhc , pqoce, pqfwf ) ! ==>> out 235 !!---------------------------------------------------------------------- 236 !! 237 !! ** Purpose : scale the fwf read from input file by the total amount received by the sbccpl interface 238 !! 239 !! ** Purpose : - read ice shelf melt from forcing file => pattern 240 !! - total amount of fwf is given by sbccpl (fwfisf_cpl) 241 !! - scale fwf and compute heat fluxes 242 !! 243 !!--------------------------------------------------------------------- 244 !!-------------------------- OUT ------------------------------------- 245 REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat content, latent heat and fwf fluxes 246 !!-------------------------- IN ------------------------------------- 247 INTEGER , INTENT(in ) :: kt ! current time step 248 REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pstbl ! salinity in tbl 249 !!-------------------------------------------------------------------- 250 REAL(wp) :: zfwf_fld, zfwf_cpl ! total fwf in the forcing fields (pattern) and from the cpl interface (amount) 251 REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! tbl freezing temperature 252 REAL(wp), DIMENSION(jpi,jpj) :: zfwf ! 2d fwf map after scaling 253 !!-------------------------------------------------------------------- 254 ! 255 ! Calculate freezing temperature 256 CALL eos_fzp( pstbl(:,:), ztfrz(:,:), risfdep(:,:) ) 257 ! 258 ! read input file 259 CALL fld_read ( kt, nn_fsbc, sf_isfcav_fwf ) 260 ! 261 ! ice shelf 2d map 262 zfwf(:,:) = - sf_isfcav_fwf(1)%fnow(:,:,1) 263 ! 264 ! compute glob sum from input file 265 zfwf_fld = glob_sum('isfcav_mlt', zfwf(:,:)) 266 ! 267 ! compute glob sum from atm->oce ice shelf fwf 268 zfwf_cpl = glob_sum('isfcav_mlt', fwfisf_cpl(:,:)) 269 ! 270 ! scale fwf 271 zfwf(:,:) = zfwf(:,:) * zfwf_cpl / zfwf_fld 272 ! 273 ! define fwf and qoce 274 ! ocean heat flux is assume to be equal to the latent heat 275 pqfwf(:,:) = zfwf(:,:) ! fwf ( >0 out) 276 pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocean heat flux ( >0 out) 277 pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( >0 out) 278 ! 279 END SUBROUTINE isfmlt_oasis 207 280 208 281 !SUBROUTINE isfmlt_3eq_frz_ktm1
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