Changeset 1322
- Timestamp:
- 2009-02-20T09:50:55+01:00 (15 years ago)
- File:
-
- 1 edited
-
trunk/NEMO/LIM_SRC_3/limsbc.F90 (modified) (9 diffs)
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trunk/NEMO/LIM_SRC_3/limsbc.F90
r1146 r1322 41 41 REAL(wp) :: rone = 1.e0 42 42 43 REAL(wp), DIMENSION(jpi,jpj) :: utau_oce !: atm.-ocean surface i-stress (ocean referential) [N/m2] 44 REAL(wp), DIMENSION(jpi,jpj) :: vtau_oce !: atm.-ocean surface j-stress (ocean referential) [N/m2] 43 REAL(wp), DIMENSION(jpi,jpj) :: utau_oce, vtau_oce !: air-ocean surface i- & j-stress [N/m2] 44 REAL(wp), DIMENSION(jpi,jpj) :: tmod_io !: modulus of the ice-ocean relative velocity [m/s] 45 REAL(wp), DIMENSION(jpi,jpj) :: ssu_mb , ssv_mb !: before mean ocean surface currents [m/s] 45 46 !! * Substitutions 46 47 # include "vectopt_loop_substitute.h90" … … 79 80 INTEGER :: ji, jj ! dummy loop indices 80 81 REAL(wp) :: zfrldu, zfrldv ! lead fraction at U- & V-points 81 REAL(wp) :: z tglx , ztgly82 REAL(wp) :: zat_ u, zu_ico, zutaui, zu_u, zv_u, zmodu, zmod83 REAL(wp) :: z at_v, zv_ico, zvtaui, zu_v, zv_v, zmodv, zsang82 REAL(wp) :: zat_u, zu_ico, zutaui, zu_u 83 REAL(wp) :: zat_v, zv_ico, zvtaui, zv_v, zsang 84 REAL(wp) :: zu_ij, zu_im1j, zv_ij, zv_ijm1 84 85 85 86 #if defined key_coupled … … 97 98 98 99 SELECT CASE( kcpl ) 99 ! 100 ! !--------------------------------! 100 101 CASE( 0 ) ! LIM 3 old stress computation ! (at ice timestep only) 101 102 ! !--------------------------------! 103 DO jj = 2, jpjm1 ! ... modulus of the ice-ocean velocity 104 DO ji = fs_2, fs_jpim1 105 zu_ij = u_ice(ji ,jj) - ssu_m(ji ,jj) ! (i ,j) 106 zu_im1j = u_ice(ji-1,jj) - ssu_m(ji-1,jj) ! (i-1,j) 107 zv_ij = v_ice(ji,jj ) - ssv_m(ji,jj ) ! (i,j ) 108 zv_ijm1 = v_ice(ji,jj-1) - ssv_m(ji,jj-1) ! (i,j-1) 109 tmod_io(ji,jj) = SQRT( 0.5 * ( zu_ij * zu_ij + zu_im1j * zu_im1j & 110 & + zv_ij * zv_ij + zv_ijm1 * zv_ijm1 ) ) 111 END DO 112 END DO 113 CALL lbc_lnk( tmod_io, 'T', 1. ) 102 114 ! ... ice stress over ocean with a ice-ocean rotation angle 103 115 DO jj = 1, jpj … … 106 118 DO ji = 1, jpi 107 119 ! ... ice velocity relative to the ocean 108 zu_ico = u_ice(ji,jj) - u_oce(ji,jj) 109 zv_ico = v_ice(ji,jj) - v_oce(ji,jj) 110 zmod = SQRT( zu_ico * zu_ico + zv_ico * zv_ico ) 120 zu_u = u_ice(ji,jj) - u_oce(ji,jj) 121 zv_v = v_ice(ji,jj) - v_oce(ji,jj) 111 122 ! quadratic drag formulation 112 ztglx = rhoco * zmod * ( cangvg * zu_ico - zsang * zv_ico ) 113 ztgly = rhoco * zmod * ( cangvg * zv_ico + zsang * zu_ico ) 123 !!gm still an error in the rotation, but usually the angle is zero (zsang=0, cangvg=1) 124 zutaui = 0.5 * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * rhoco * ( cangvg * zu_u - zsang * zv_v ) 125 zvtaui = 0.5 * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * rhoco * ( cangvg * zv_v + zsang * zu_u ) 114 126 ! IMPORTANT 115 127 ! these lines are bound to prevent numerical oscillations … … 117 129 ! They are physically ill-based. There is a cleaner solution 118 130 ! to try (remember discussion in Paris Gurvan) 119 ztio_u(ji,jj) = z tglx * exp( - zmod / 0.5 )120 ztio_v(ji,jj) = z tgly * exp( - zmod / 0.5)131 ztio_u(ji,jj) = zutaui * exp( - ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) ) 132 ztio_v(ji,jj) = zvtaui * exp( - ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) ) 121 133 ! 122 134 END DO … … 141 153 CASE( 1 ) ! Use the now velocity ! (at each ocean timestep) 142 154 ! !--------------------------------! 143 ! ... save the air-ocean stresses at ice time-step144 155 IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN 145 utau_oce(:,:) = utau(:,:) 156 utau_oce(:,:) = utau(:,:) ! ... save the air-ocean stresses at ice time-step 146 157 vtau_oce(:,:) = vtau(:,:) 158 DO jj = 2, jpjm1 ! ... modulus of the ice-ocean velocity 159 DO ji = fs_2, fs_jpim1 160 zu_ij = u_ice(ji ,jj) - ssu_m(ji ,jj) ! (i ,j) 161 zu_im1j = u_ice(ji-1,jj) - ssu_m(ji-1,jj) ! (i-1,j) 162 zv_ij = v_ice(ji,jj ) - ssv_m(ji,jj ) ! (i,j ) 163 zv_ijm1 = v_ice(ji,jj-1) - ssv_m(ji,jj-1) ! (i,j-1) 164 tmod_io(ji,jj) = SQRT( 0.5 * ( zu_ij * zu_ij + zu_im1j * zu_im1j & 165 & + zv_ij * zv_ij + zv_ijm1 * zv_ijm1 ) ) 166 END DO 167 END DO 168 CALL lbc_lnk( tmod_io, 'T', 1. ) 147 169 ENDIF 148 170 ! ... ice stress over ocean with a ice-ocean rotation angle … … 154 176 zat_v = ( at_i(ji,jj) + at_i(ji,jj+1) ) * 0.5 155 177 156 zu_u = u_ice(ji,jj) - un(ji,jj,1) ! u ice-ocean velocity at U-point 157 zv_v = v_ice(ji,jj) - vn(ji,jj,1) ! v ice-ocean velocity at V-point 178 zu_u = u_ice(ji,jj) - ub(ji,jj,1) ! u ice-ocean velocity at U-point 179 zv_v = v_ice(ji,jj) - vb(ji,jj,1) ! v ice-ocean velocity at V-point 180 ! 181 !!gm still an error in the rotation, but usually the angle is zero (zsang=0, cangvg=1) 182 zutaui = 0.5 * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * rhoco * ( cangvg * zu_u - zsang * zv_v ) 183 zvtaui = 0.5 * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * rhoco * ( cangvg * zv_v + zsang * zu_u ) 184 185 utau(ji,jj) = ( 1.- zat_u ) * utau_oce(ji,jj) + zat_u * zutaui ! stress at the ocean surface 186 vtau(ji,jj) = ( 1.- zat_v ) * vtau_oce(ji,jj) + zat_v * zvtaui 158 187 ! ! u ice-ocean velocity at V-point 159 zu_v = 0.25 * ( u_ice(ji,jj ) - un(ji,jj ,1) + u_ice(ji+1,jj ) - un(ji+1,jj ,1) &160 & + u_ice(ji,jj-1) - un(ji,jj-1,1) + u_ice(ji+1,jj-1) - un(ji+1,jj-1,1) )161 ! ! v ice-ocean velocity at U-point162 zv_u = 0.25 * ( v_ice(ji-1,jj+1) - vn(ji-1,jj+1,1) + v_ice(ji,jj+1) - vn(ji,jj+1,1) &163 & + v_ice(ji-1,jj ) - vn(ji-1,jj ,1) + v_ice(ji,jj ) - vn(ji,jj ,1) )164 zmodu = SQRT( zu_u * zu_u + zv_u * zv_u ) ! module of the ice-ocean velocity at U-point165 zmodv = SQRT( zu_v * zu_v + zv_v * zv_v ) ! module of the ice-ocean velocity at V-point166 zutaui = rhoco * zmodu * ( cangvg * zu_u - zsang * zv_u )167 zvtaui = rhoco * zmodv * ( cangvg * zv_v + zsang * zu_v )168 169 utau(ji,jj) = ( 1.-zat_u ) * utau_oce(ji,jj) + zat_u * zutaui ! stress at the ocean surface170 vtau(ji,jj) = ( 1.-zat_v ) * vtau_oce(ji,jj) + zat_v * zvtaui171 188 END DO 172 189 END DO … … 177 194 CASE( 2 ) ! mixed 0 and 2 cases ! (at each ocean timestep) 178 195 ! !--------------------------------! 179 ! ... save the air-ocean stresses at ice time-step180 196 IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN 181 utau_oce(:,:) = utau(:,:) 182 vtau_oce(:,:) = vtau(:,:) 197 utau_oce(:,:) = utau (:,:) ! ... save the air-ocean stresses at ice time-step 198 vtau_oce(:,:) = vtau (:,:) 199 ssu_mb (:,:) = ssu_m(:,:) ! ... save the ice-ocean velocity at ice time-step 200 ssv_mb (:,:) = ssv_m(:,:) 201 DO jj = 2, jpjm1 ! ... modulus of the ice-ocean velocity 202 DO ji = fs_2, fs_jpim1 203 zu_ij = u_ice(ji ,jj) - ssu_m(ji ,jj) ! (i ,j) 204 zu_im1j = u_ice(ji-1,jj) - ssu_m(ji-1,jj) ! (i-1,j) 205 zv_ij = v_ice(ji,jj ) - ssv_m(ji,jj ) ! (i,j ) 206 zv_ijm1 = v_ice(ji,jj-1) - ssv_m(ji,jj-1) ! (i,j-1) 207 tmod_io(ji,jj) = SQRT( 0.5 * ( zu_ij * zu_ij + zu_im1j * zu_im1j & 208 & + zv_ij * zv_ij + zv_ijm1 * zv_ijm1 ) ) 209 END DO 210 END DO 211 CALL lbc_lnk( tmod_io, 'T', 1. ) 183 212 ENDIF 184 213 ! ... ice stress over ocean with a ice-ocean rotation angle … … 187 216 DO ji = fs_2, fs_jpim1 188 217 ! computation of wind stress over ocean in X and Y direction 189 zat_u = at_i(ji,jj) + at_i(ji+1,jj) * 0.5 ! ice area at u and V-points190 zat_v = at_i(ji,jj) + at_i(ji,jj+1) * 0.5218 zat_u = ( at_i(ji,jj) + at_i(ji+1,jj) ) * 0.5 ! ice area at u and V-points 219 zat_v = ( at_i(ji,jj) + at_i(ji,jj+1) ) * 0.5 191 220 192 221 !!gm bug mixing U and V points value below ====>>> to be corrected 193 zu_ico = u_ice(ji,jj) - 0.5 * ( un(ji,jj,1) - ssu_m(ji,jj) ) ! ice-oce velocity using un and ssu_m 194 zv_ico = v_ice(ji,jj) - 0.5 * ( vn(ji,jj,1) - ssu_m(ji,jj) ) 195 ! ! module of the ice-ocean velocity 196 zmod = SQRT( zu_ico * zu_ico + zv_ico * zv_ico ) 222 zu_ico = u_ice(ji,jj) - 0.5 * ( ub(ji,jj,1) - ssu_mb(ji,jj) ) ! ice-oce velocity using un and ssu_mb 223 zv_ico = v_ice(ji,jj) - 0.5 * ( vb(ji,jj,1) - ssv_mb(ji,jj) ) 197 224 ! ! quadratic drag formulation with rotation 198 zutaui = rhoco * zmod * ( cangvg * zu_ico - zsang * zv_ico ) 199 zvtaui = rhoco * zmod * ( cangvg * zv_ico + zsang * zu_ico ) 225 !!gm still an error in the rotation, but usually the angle is zero (zsang=0, cangvg=1) 226 zutaui = 0.5 * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * rhoco * ( cangvg * zu_ico - zsang * zv_ico ) 227 zvtaui = 0.5 * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * rhoco * ( cangvg * zv_ico + zsang * zu_ico ) 200 228 ! 201 229 utau(ji,jj) = ( 1.-zat_u ) * utau_oce(ji,jj) + zat_u * zutaui ! stress at the ocean surface
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