| 1 | MODULE sbcana |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcana *** |
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| 4 | !! Ocean forcing: analytical momentum, heat and freshwater forcings |
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| 5 | !!===================================================================== |
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| 6 | !! History : 3.0 ! 2006-06 (G. Madec) Original code |
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| 7 | !! 3.2 ! 2009-07 (G. Madec) Style only |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! sbc_ana : set an analytical ocean forcing |
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| 12 | !! sbc_gyre : set the GYRE configuration analytical forcing |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | USE oce ! ocean dynamics and tracers |
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| 15 | USE dom_oce ! ocean space and time domain |
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| 16 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 17 | USE phycst ! physical constants |
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| 18 | USE in_out_manager ! I/O manager |
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| 19 | USE lib_mpp ! distribued memory computing library |
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| 20 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 21 | USE lib_fortran |
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| 22 | |
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| 23 | IMPLICIT NONE |
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| 24 | PRIVATE |
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| 25 | |
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| 26 | PUBLIC sbc_ana ! routine called in sbcmod module |
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| 27 | PUBLIC sbc_gyre ! routine called in sbcmod module |
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| 28 | |
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| 29 | ! !!* Namelist namsbc_ana * |
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| 30 | INTEGER :: nn_tau000 = 1 ! nb of time-step during which the surface stress |
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| 31 | ! ! increase from 0 to its nominal value |
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| 32 | REAL(wp) :: rn_utau0 = 0._wp ! constant wind stress value in i-direction |
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| 33 | REAL(wp) :: rn_vtau0 = 0._wp ! constant wind stress value in j-direction |
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| 34 | REAL(wp) :: rn_qns0 = 0._wp ! non solar heat flux |
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| 35 | REAL(wp) :: rn_qsr0 = 0._wp ! solar heat flux |
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| 36 | REAL(wp) :: rn_emp0 = 0._wp ! net freshwater flux |
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| 37 | |
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| 38 | !! * Substitutions |
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| 39 | # include "domzgr_substitute.h90" |
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| 40 | # include "vectopt_loop_substitute.h90" |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 43 | !! $Id$ |
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| 44 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | CONTAINS |
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| 47 | |
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| 48 | SUBROUTINE sbc_ana( kt ) |
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| 49 | !!--------------------------------------------------------------------- |
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| 50 | !! *** ROUTINE sbc_ana *** |
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| 51 | !! |
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| 52 | !! ** Purpose : provide at each time-step the ocean surface boundary |
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| 53 | !! condition, i.e. the momentum, heat and freshwater fluxes. |
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| 54 | !! |
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| 55 | !! ** Method : Constant and uniform surface forcing specified from |
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| 56 | !! namsbc_ana namelist parameters. All the fluxes are time |
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| 57 | !! independant except the stresses which increase from zero |
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| 58 | !! during the first nn_tau000 time-step |
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| 59 | !! CAUTION : never mask the surface stress field ! |
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| 60 | !! |
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| 61 | !! ** Action : - set the ocean surface boundary condition, i.e. |
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| 62 | !! utau, vtau, taum, wndm, qns, qsr, emp |
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| 63 | !!---------------------------------------------------------------------- |
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| 64 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 65 | ! |
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| 66 | REAL(wp) :: zfacto ! local scalar |
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| 67 | REAL(wp) :: zrhoa = 1.22_wp ! Air density kg/m3 |
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| 68 | REAL(wp) :: zcdrag = 1.5e-3_wp ! drag coefficient |
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| 69 | REAL(wp) :: ztx, zty, zmod, zcoef ! temporary variables |
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| 70 | !! |
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| 71 | NAMELIST/namsbc_ana/ nn_tau000, rn_utau0, rn_vtau0, rn_qns0, rn_qsr0, rn_emp0 |
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| 72 | !!--------------------------------------------------------------------- |
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| 73 | ! |
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| 74 | IF( kt == nit000 ) THEN |
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| 75 | ! |
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| 76 | REWIND( numnam ) ! Read Namelist namsbc : surface fluxes |
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| 77 | READ ( numnam, namsbc_ana ) |
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| 78 | ! |
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| 79 | IF(lwp) WRITE(numout,*)' ' |
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| 80 | IF(lwp) WRITE(numout,*)' sbc_ana : Constant surface fluxes read in namsbc_ana namelist' |
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| 81 | IF(lwp) WRITE(numout,*)' ~~~~~~~ ' |
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| 82 | IF(lwp) WRITE(numout,*)' spin up of the stress nn_tau000 = ', nn_tau000, ' time-steps' |
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| 83 | IF(lwp) WRITE(numout,*)' constant i-stress rn_utau0 = ', rn_utau0 , ' N/m2' |
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| 84 | IF(lwp) WRITE(numout,*)' constant j-stress rn_vtau0 = ', rn_vtau0 , ' N/m2' |
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| 85 | IF(lwp) WRITE(numout,*)' non solar heat flux rn_qns0 = ', rn_qns0 , ' W/m2' |
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| 86 | IF(lwp) WRITE(numout,*)' solar heat flux rn_qsr0 = ', rn_qsr0 , ' W/m2' |
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| 87 | IF(lwp) WRITE(numout,*)' net heat flux rn_emp0 = ', rn_emp0 , ' Kg/m2/s' |
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| 88 | ! |
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| 89 | nn_tau000 = MAX( nn_tau000, 1 ) ! must be >= 1 |
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| 90 | ! |
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| 91 | emp (:,:) = rn_emp0 |
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| 92 | qns (:,:) = rn_qns0 - emp(:,:) * sst_m(:,:) * rcp ! including heat content associated with mass flux at SST |
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| 93 | qsr (:,:) = rn_qsr0 |
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| 94 | ! |
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| 95 | utau(:,:) = rn_utau0 |
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| 96 | vtau(:,:) = rn_vtau0 |
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| 97 | taum(:,:) = SQRT ( rn_utau0 * rn_utau0 + rn_vtau0 * rn_vtau0 ) |
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| 98 | wndm(:,:) = SQRT ( taum(1,1) / ( zrhoa * zcdrag ) ) |
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| 99 | ! |
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| 100 | ENDIF |
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| 101 | |
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| 102 | |
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| 103 | ! Increase the surface stress to its nominal value during the first nn_tau000 time-steps |
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| 104 | IF( kt <= nn_tau000 ) THEN |
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| 105 | zfacto = 0.5 * ( 1. - COS( rpi * FLOAT( kt ) / FLOAT( nn_tau000 ) ) ) |
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| 106 | zcoef = 1. / ( zrhoa * zcdrag ) |
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| 107 | ztx = zfacto * rn_utau0 |
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| 108 | zty = zfacto * rn_vtau0 |
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| 109 | zmod = SQRT( ztx * ztx + zty * zty ) |
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| 110 | utau(:,:) = ztx |
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| 111 | vtau(:,:) = zty |
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| 112 | taum(:,:) = zmod |
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| 113 | zmod = SQRT( zmod * zcoef ) |
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| 114 | wndm(:,:) = zmod |
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| 115 | ENDIF |
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| 116 | ! |
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| 117 | END SUBROUTINE sbc_ana |
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| 118 | |
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| 119 | |
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| 120 | SUBROUTINE sbc_gyre( kt ) |
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| 121 | !!--------------------------------------------------------------------- |
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| 122 | !! *** ROUTINE sbc_ana *** |
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| 123 | !! |
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| 124 | !! ** Purpose : provide at each time-step the GYRE surface boundary |
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| 125 | !! condition, i.e. the momentum, heat and freshwater fluxes. |
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| 126 | !! |
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| 127 | !! ** Method : analytical seasonal cycle for GYRE configuration. |
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| 128 | !! CAUTION : never mask the surface stress field ! |
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| 129 | !! |
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| 130 | !! ** Action : - set the ocean surface boundary condition, i.e. |
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| 131 | !! utau, vtau, taum, wndm, qns, qsr, emp |
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| 132 | !! |
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| 133 | !! Reference : Hazeleger, W., and S. Drijfhout, JPO, 30, 677-695, 2000. |
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| 134 | !!---------------------------------------------------------------------- |
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| 135 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 136 | !! |
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| 137 | INTEGER :: ji, jj ! dummy loop indices |
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| 138 | INTEGER :: zyear0 ! initial year |
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| 139 | INTEGER :: zmonth0 ! initial month |
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| 140 | INTEGER :: zday0 ! initial day |
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| 141 | INTEGER :: zday_year0 ! initial day since january 1st |
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| 142 | REAL(wp) :: ztau , ztau_sais ! wind intensity and of the seasonal cycle |
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| 143 | REAL(wp) :: ztime ! time in hour |
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| 144 | REAL(wp) :: ztimemax , ztimemin ! 21th June, and 21th decem. if date0 = 1st january |
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| 145 | REAL(wp) :: ztimemax1, ztimemin1 ! 21th June, and 21th decem. if date0 = 1st january |
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| 146 | REAL(wp) :: ztimemax2, ztimemin2 ! 21th June, and 21th decem. if date0 = 1st january |
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| 147 | REAL(wp) :: ztaun ! intensity |
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| 148 | REAL(wp) :: zemp_s, zemp_n, zemp_sais, ztstar |
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| 149 | REAL(wp) :: zcos_sais1, zcos_sais2, ztrp, zconv, t_star |
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| 150 | REAL(wp) :: zsumemp, zsurf |
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| 151 | REAL(wp) :: zrhoa = 1.22 ! Air density kg/m3 |
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| 152 | REAL(wp) :: zcdrag = 1.5e-3 ! drag coefficient |
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| 153 | REAL(wp) :: ztx, zty, zmod, zcoef ! temporary variables |
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| 154 | REAL(wp) :: zyydd ! number of days in one year |
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| 155 | !!--------------------------------------------------------------------- |
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| 156 | zyydd = REAL(nyear_len(1),wp) |
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| 157 | |
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| 158 | ! ---------------------------- ! |
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| 159 | ! heat and freshwater fluxes ! |
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| 160 | ! ---------------------------- ! |
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| 161 | !same temperature, E-P as in HAZELEGER 2000 |
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| 162 | |
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| 163 | zyear0 = ndate0 / 10000 ! initial year |
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| 164 | zmonth0 = ( ndate0 - zyear0 * 10000 ) / 100 ! initial month |
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| 165 | zday0 = ndate0 - zyear0 * 10000 - zmonth0 * 100 ! initial day betwen 1 and 30 |
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| 166 | zday_year0 = ( zmonth0 - 1 ) * 30.+zday0 ! initial day betwen 1 and 360 |
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| 167 | |
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| 168 | ! current day (in hours) since january the 1st of the current year |
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| 169 | ztime = REAL( kt ) * rdt / (rmmss * rhhmm) & ! total incrementation (in hours) |
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| 170 | & - (nyear - 1) * rjjhh * zyydd ! minus years since beginning of experiment (in hours) |
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| 171 | |
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| 172 | ztimemax1 = ((5.*30.)+21.)* 24. ! 21th june at 24h in hours |
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| 173 | ztimemin1 = ztimemax1 + rjjhh * zyydd / 2 ! 21th december in hours |
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| 174 | ztimemax2 = ((6.*30.)+21.)* 24. ! 21th july at 24h in hours |
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| 175 | ztimemin2 = ztimemax2 - rjjhh * zyydd / 2 ! 21th january in hours |
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| 176 | ! ! NB: rjjhh * zyydd / 4 = one seasonal cycle in hours |
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| 177 | |
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| 178 | ! amplitudes |
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| 179 | zemp_S = 0.7 ! intensity of COS in the South |
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| 180 | zemp_N = 0.8 ! intensity of COS in the North |
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| 181 | zemp_sais = 0.1 |
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| 182 | zTstar = 28.3 ! intemsity from 28.3 a -5 deg |
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| 183 | |
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| 184 | ! 1/2 period between 21th June and 21th December and between 21th July and 21th January |
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| 185 | zcos_sais1 = COS( (ztime - ztimemax1) / (ztimemin1 - ztimemax1) * rpi ) |
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| 186 | zcos_sais2 = COS( (ztime - ztimemax2) / (ztimemax2 - ztimemin2) * rpi ) |
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| 187 | |
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| 188 | ztrp= - 40.e0 ! retroaction term on heat fluxes (W/m2/K) |
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| 189 | zconv = 3.16e-5 ! convertion factor: 1 m/yr => 3.16e-5 mm/s |
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| 190 | DO jj = 1, jpj |
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| 191 | DO ji = 1, jpi |
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| 192 | ! domain from 15 deg to 50 deg between 27 and 28 degC at 15N, -3 |
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| 193 | ! and 13 degC at 50N 53.5 + or - 11 = 1/4 period : |
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| 194 | ! 64.5 in summer, 42.5 in winter |
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| 195 | t_star = zTstar * ( 1 + 1. / 50. * zcos_sais2 ) & |
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| 196 | & * COS( rpi * (gphit(ji,jj) - 5.) & |
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| 197 | & / ( 53.5 * ( 1 + 11 / 53.5 * zcos_sais2 ) * 2.) ) |
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| 198 | ! 23.5 deg : tropics |
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| 199 | qsr (ji,jj) = 230 * COS( 3.1415 * ( gphit(ji,jj) - 23.5 * zcos_sais1 ) / ( 0.9 * 180 ) ) |
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| 200 | qns (ji,jj) = ztrp * ( tsb(ji,jj,1,jp_tem) - t_star ) - qsr(ji,jj) |
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| 201 | IF( gphit(ji,jj) >= 14.845 .AND. 37.2 >= gphit(ji,jj) ) THEN ! zero at 37.8 deg, max at 24.6 deg |
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| 202 | emp (ji,jj) = zemp_S * zconv & |
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| 203 | & * SIN( rpi / 2 * (gphit(ji,jj) - 37.2) / (24.6 - 37.2) ) & |
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| 204 | & * ( 1 - zemp_sais / zemp_S * zcos_sais1) |
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| 205 | ELSE |
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| 206 | emp (ji,jj) = - zemp_N * zconv & |
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| 207 | & * SIN( rpi / 2 * (gphit(ji,jj) - 37.2) / (46.8 - 37.2) ) & |
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| 208 | & * ( 1 - zemp_sais / zemp_N * zcos_sais1 ) |
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| 209 | ENDIF |
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| 210 | END DO |
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| 211 | END DO |
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| 212 | |
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| 213 | ! Compute the emp flux such as its integration on the whole domain at each time is zero |
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| 214 | IF( nbench /= 1 ) THEN |
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| 215 | zsumemp = GLOB_SUM( emp(:,:) ) |
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| 216 | zsurf = GLOB_SUM( tmask(:,:,1) ) |
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| 217 | ! Default GYRE configuration |
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| 218 | zsumemp = zsumemp / zsurf |
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| 219 | ELSE |
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| 220 | ! Benchmark GYRE configuration (to allow the bit to bit comparison between Mpp/Mono case) |
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| 221 | zsumemp = 0.e0 ; zsurf = 0.e0 |
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| 222 | ENDIF |
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| 223 | |
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| 224 | ! freshwater (mass flux) and update of qns with heat content of emp |
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| 225 | emp (:,:) = emp(:,:) - zsumemp * tmask(:,:,1) ! freshwater flux (=0 in domain average) |
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| 226 | qns (:,:) = qns(:,:) - emp(:,:) * sst_m(:,:) * rcp ! evap and precip are at SST |
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| 227 | |
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| 228 | |
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| 229 | ! ---------------------------- ! |
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| 230 | ! momentum fluxes ! |
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| 231 | ! ---------------------------- ! |
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| 232 | ! same wind as in Wico |
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| 233 | !test date0 : ndate0 = 010203 |
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| 234 | zyear0 = ndate0 / 10000 |
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| 235 | zmonth0 = ( ndate0 - zyear0 * 10000 ) / 100 |
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| 236 | zday0 = ndate0 - zyear0 * 10000 - zmonth0 * 100 |
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| 237 | !Calculates nday_year, day since january 1st |
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| 238 | zday_year0 = (zmonth0-1)*30.+zday0 |
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| 239 | |
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| 240 | !accumulates days of previous months of this year |
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| 241 | ! day (in hours) since january the 1st |
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| 242 | ztime = FLOAT( kt ) * rdt / (rmmss * rhhmm) & ! incrementation in hour |
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| 243 | & - (nyear - 1) * rjjhh * zyydd ! - nber of hours the precedent years |
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| 244 | ztimemax = ((5.*30.)+21.)* 24. ! 21th june in hours |
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| 245 | ztimemin = ztimemax + rjjhh * zyydd / 2 ! 21th december in hours |
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| 246 | ! ! NB: rjjhh * zyydd / 4 = 1 seasonal cycle in hours |
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| 247 | |
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| 248 | ! mean intensity at 0.105 ; srqt(2) because projected with 45deg angle |
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| 249 | ztau = 0.105 / SQRT( 2. ) |
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| 250 | ! seasonal oscillation intensity |
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| 251 | ztau_sais = 0.015 |
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| 252 | ztaun = ztau - ztau_sais * COS( (ztime - ztimemax) / (ztimemin - ztimemax) * rpi ) |
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| 253 | DO jj = 1, jpj |
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| 254 | DO ji = 1, jpi |
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| 255 | ! domain from 15deg to 50deg and 1/2 period along 14deg |
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| 256 | ! so 5/4 of half period with seasonal cycle |
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| 257 | utau(ji,jj) = - ztaun * SIN( rpi * (gphiu(ji,jj) - 15.) / (29.-15.) ) |
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| 258 | vtau(ji,jj) = ztaun * SIN( rpi * (gphiv(ji,jj) - 15.) / (29.-15.) ) |
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| 259 | END DO |
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| 260 | END DO |
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| 261 | |
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| 262 | ! module of wind stress and wind speed at T-point |
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| 263 | zcoef = 1. / ( zrhoa * zcdrag ) |
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| 264 | !CDIR NOVERRCHK |
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| 265 | DO jj = 2, jpjm1 |
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| 266 | !CDIR NOVERRCHK |
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| 267 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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| 268 | ztx = utau(ji-1,jj ) + utau(ji,jj) |
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| 269 | zty = vtau(ji ,jj-1) + vtau(ji,jj) |
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| 270 | zmod = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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| 271 | taum(ji,jj) = zmod |
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| 272 | wndm(ji,jj) = SQRT( zmod * zcoef ) |
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| 273 | END DO |
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| 274 | END DO |
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| 275 | CALL lbc_lnk( taum(:,:), 'T', 1. ) ; CALL lbc_lnk( wndm(:,:), 'T', 1. ) |
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| 276 | |
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| 277 | ! ---------------------------------- ! |
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| 278 | ! control print at first time-step ! |
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| 279 | ! ---------------------------------- ! |
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| 280 | IF( kt == nit000 .AND. lwp ) THEN |
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| 281 | WRITE(numout,*) |
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| 282 | WRITE(numout,*)'sbc_gyre : analytical surface fluxes for GYRE configuration' |
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| 283 | WRITE(numout,*)'~~~~~~~~ ' |
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| 284 | WRITE(numout,*)' nyear = ', nyear |
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| 285 | WRITE(numout,*)' nmonth = ', nmonth |
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| 286 | WRITE(numout,*)' nday = ', nday |
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| 287 | WRITE(numout,*)' nday_year = ', nday_year |
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| 288 | WRITE(numout,*)' ztime = ', ztime |
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| 289 | WRITE(numout,*)' ztimemax = ', ztimemax |
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| 290 | WRITE(numout,*)' ztimemin = ', ztimemin |
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| 291 | WRITE(numout,*)' ztimemax1 = ', ztimemax1 |
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| 292 | WRITE(numout,*)' ztimemin1 = ', ztimemin1 |
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| 293 | WRITE(numout,*)' ztimemax2 = ', ztimemax2 |
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| 294 | WRITE(numout,*)' ztimemin2 = ', ztimemin2 |
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| 295 | WRITE(numout,*)' zyear0 = ', zyear0 |
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| 296 | WRITE(numout,*)' zmonth0 = ', zmonth0 |
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| 297 | WRITE(numout,*)' zday0 = ', zday0 |
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| 298 | WRITE(numout,*)' zday_year0 = ', zday_year0 |
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| 299 | WRITE(numout,*)' zyydd = ', zyydd |
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| 300 | WRITE(numout,*)' zemp_S = ', zemp_S |
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| 301 | WRITE(numout,*)' zemp_N = ', zemp_N |
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| 302 | WRITE(numout,*)' zemp_sais = ', zemp_sais |
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| 303 | WRITE(numout,*)' zTstar = ', zTstar |
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| 304 | WRITE(numout,*)' zsumemp = ', zsumemp |
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| 305 | WRITE(numout,*)' zsurf = ', zsurf |
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| 306 | WRITE(numout,*)' ztrp = ', ztrp |
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| 307 | WRITE(numout,*)' zconv = ', zconv |
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| 308 | WRITE(numout,*)' ndastp = ', ndastp |
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| 309 | WRITE(numout,*)' adatrj = ', adatrj |
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| 310 | ENDIF |
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| 311 | ! |
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| 312 | END SUBROUTINE sbc_gyre |
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| 313 | |
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| 314 | !!====================================================================== |
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| 315 | END MODULE sbcana |
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