[3] | 1 | MODULE trabbc |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE trabbc *** |
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[2528] | 4 | !! Ocean active tracers: bottom boundary condition (geothermal heat flux) |
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[3] | 5 | !!============================================================================== |
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[2528] | 6 | !! History : OPA ! 1999-10 (G. Madec) original code |
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| 7 | !! NEMO 1.0 ! 2002-08 (G. Madec) free form + modules |
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| 8 | !! - ! 2002-11 (A. Bozec) tra_bbc_init: original code |
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| 9 | !! 3.3 ! 2010-10 (G. Madec) dynamical allocation + suppression of key_trabbc |
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| 10 | !! - ! 2010-11 (G. Madec) use mbkt array (deepest ocean t-level) |
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[503] | 11 | !!---------------------------------------------------------------------- |
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[2528] | 12 | |
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[3] | 13 | !!---------------------------------------------------------------------- |
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| 14 | !! tra_bbc : update the tracer trend at ocean bottom |
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| 15 | !! tra_bbc_init : initialization of geothermal heat flux trend |
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| 16 | !!---------------------------------------------------------------------- |
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[2528] | 17 | USE oce ! ocean variables |
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| 18 | USE dom_oce ! domain: ocean |
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[3] | 19 | USE phycst ! physical constants |
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[2528] | 20 | USE trdmod_oce ! trends: ocean variables |
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| 21 | USE trdtra ! trends: active tracers |
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[3] | 22 | USE in_out_manager ! I/O manager |
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[258] | 23 | USE prtctl ! Print control |
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[3294] | 24 | USE wrk_nemo ! Memory Allocation |
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| 25 | USE timing ! Timing |
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[3] | 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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| 29 | |
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| 30 | PUBLIC tra_bbc ! routine called by step.F90 |
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[2528] | 31 | PUBLIC tra_bbc_init ! routine called by opa.F90 |
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[3] | 32 | |
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[2528] | 33 | ! !!* Namelist nambbc: bottom boundary condition * |
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| 34 | LOGICAL, PUBLIC :: ln_trabbc = .FALSE. !: Geothermal heat flux flag |
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| 35 | INTEGER :: nn_geoflx = 1 ! Geothermal flux (=1:constant flux, =2:read in file ) |
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| 36 | REAL(wp) :: rn_geoflx_cst = 86.4e-3_wp ! Constant value of geothermal heat flux |
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[3] | 37 | |
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[2528] | 38 | REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: qgh_trd0 ! geothermal heating trend |
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[3] | 39 | |
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| 40 | !! * Substitutions |
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| 41 | # include "domzgr_substitute.h90" |
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| 42 | !!---------------------------------------------------------------------- |
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[2528] | 43 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 44 | !! $Id $ |
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| 45 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 46 | !!---------------------------------------------------------------------- |
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| 47 | CONTAINS |
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| 48 | |
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| 49 | SUBROUTINE tra_bbc( kt ) |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | !! *** ROUTINE tra_bbc *** |
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| 52 | !! |
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| 53 | !! ** Purpose : Compute the bottom boundary contition on temperature |
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[1601] | 54 | !! associated with geothermal heating and add it to the |
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| 55 | !! general trend of temperature equations. |
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[3] | 56 | !! |
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| 57 | !! ** Method : The geothermal heat flux set to its constant value of |
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[1601] | 58 | !! 86.4 mW/m2 (Stein and Stein 1992, Huang 1999). |
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[3] | 59 | !! The temperature trend associated to this heat flux through the |
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| 60 | !! ocean bottom can be computed once and is added to the temperature |
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| 61 | !! trend juste above the bottom at each time step: |
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[2528] | 62 | !! ta = ta + Qsf / (rau0 rcp e3T) for k= mbkt |
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[3] | 63 | !! Where Qsf is the geothermal heat flux. |
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| 64 | !! |
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| 65 | !! ** Action : - update the temperature trends (ta) with the trend of |
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| 66 | !! the ocean bottom boundary condition |
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| 67 | !! |
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[503] | 68 | !! References : Stein, C. A., and S. Stein, 1992, Nature, 359, 123-129. |
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[1601] | 69 | !! Emile-Geay and Madec, 2009, Ocean Science. |
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[503] | 70 | !!---------------------------------------------------------------------- |
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[2715] | 71 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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[503] | 72 | !! |
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[2528] | 73 | INTEGER :: ji, jj, ik ! dummy loop indices |
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| 74 | REAL(wp) :: zqgh_trd ! geothermal heat flux trend |
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[3294] | 75 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdt |
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[3] | 76 | !!---------------------------------------------------------------------- |
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[2528] | 77 | ! |
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[3294] | 78 | IF( nn_timing == 1 ) CALL timing_start('tra_bbc') |
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| 79 | ! |
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[503] | 80 | IF( l_trdtra ) THEN ! Save ta and sa trends |
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[3294] | 81 | CALL wrk_alloc( jpi, jpj, jpk, ztrdt ) |
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| 82 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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[503] | 83 | ENDIF |
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| 84 | ! |
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[2528] | 85 | ! ! Add the geothermal heat flux trend on temperature |
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[789] | 86 | #if defined key_vectopt_loop |
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[2528] | 87 | DO jj = 1, 1 |
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| 88 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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[3] | 89 | #else |
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[2528] | 90 | DO jj = 2, jpjm1 |
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| 91 | DO ji = 2, jpim1 |
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[1601] | 92 | #endif |
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[2528] | 93 | ik = mbkt(ji,jj) |
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| 94 | zqgh_trd = qgh_trd0(ji,jj) / fse3t(ji,jj,ik) |
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| 95 | tsa(ji,jj,ik,jp_tem) = tsa(ji,jj,ik,jp_tem) + zqgh_trd |
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[3] | 96 | END DO |
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[2528] | 97 | END DO |
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| 98 | ! |
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[503] | 99 | IF( l_trdtra ) THEN ! Save the geothermal heat flux trend for diagnostics |
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[2528] | 100 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) |
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| 101 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_trd_bbc, ztrdt ) |
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[3294] | 102 | CALL wrk_dealloc( jpi, jpj, jpk, ztrdt ) |
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[3] | 103 | ENDIF |
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[503] | 104 | ! |
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[2528] | 105 | IF(ln_ctl) CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' bbc - Ta: ', mask1=tmask, clinfo3='tra-ta' ) |
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[503] | 106 | ! |
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[3294] | 107 | IF( nn_timing == 1 ) CALL timing_stop('tra_bbc') |
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| 108 | ! |
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[3] | 109 | END SUBROUTINE tra_bbc |
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| 110 | |
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| 111 | |
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| 112 | SUBROUTINE tra_bbc_init |
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| 113 | !!---------------------------------------------------------------------- |
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| 114 | !! *** ROUTINE tra_bbc_init *** |
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| 115 | !! |
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[1601] | 116 | !! ** Purpose : Compute once for all the trend associated with geothermal |
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| 117 | !! heating that will be applied at each time step at the |
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| 118 | !! last ocean level |
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[3] | 119 | !! |
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| 120 | !! ** Method : Read the nambbc namelist and check the parameters. |
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| 121 | !! |
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| 122 | !! ** Input : - Namlist nambbc |
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| 123 | !! - NetCDF file : geothermal_heating.nc ( if necessary ) |
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| 124 | !! |
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[592] | 125 | !! ** Action : - read/fix the geothermal heat qgh_trd0 |
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[3] | 126 | !!---------------------------------------------------------------------- |
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[473] | 127 | USE iom |
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[503] | 128 | !! |
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[3] | 129 | INTEGER :: ji, jj ! dummy loop indices |
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[473] | 130 | INTEGER :: inum ! temporary logical unit |
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[1601] | 131 | !! |
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[2528] | 132 | NAMELIST/nambbc/ln_trabbc, nn_geoflx, rn_geoflx_cst |
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[3] | 133 | !!---------------------------------------------------------------------- |
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| 134 | |
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[2528] | 135 | REWIND( numnam ) ! Read Namelist nambbc : bottom momentum boundary condition |
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| 136 | READ ( numnam, nambbc ) |
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[3] | 137 | |
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[2528] | 138 | IF(lwp) THEN ! Control print |
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[1601] | 139 | WRITE(numout,*) |
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[2528] | 140 | WRITE(numout,*) 'tra_bbc : Bottom Boundary Condition (bbc), apply a Geothermal heating' |
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[1601] | 141 | WRITE(numout,*) '~~~~~~~ ' |
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| 142 | WRITE(numout,*) ' Namelist nambbc : set bbc parameters' |
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[2528] | 143 | WRITE(numout,*) ' Apply a geothermal heating at ocean bottom ln_trabbc = ', ln_trabbc |
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| 144 | WRITE(numout,*) ' type of geothermal flux nn_geoflx = ', nn_geoflx |
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| 145 | WRITE(numout,*) ' Constant geothermal flux value rn_geoflx_cst = ', rn_geoflx_cst |
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[1601] | 146 | WRITE(numout,*) |
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| 147 | ENDIF |
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[3] | 148 | |
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[2528] | 149 | IF( ln_trabbc ) THEN !== geothermal heating ==! |
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[503] | 150 | ! |
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[2528] | 151 | ALLOCATE( qgh_trd0(jpi,jpj) ) ! allocation |
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[503] | 152 | ! |
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[2528] | 153 | SELECT CASE ( nn_geoflx ) ! geothermal heat flux / (rauO * Cp) |
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[503] | 154 | ! |
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[2528] | 155 | CASE ( 1 ) !* constant flux |
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| 156 | IF(lwp) WRITE(numout,*) ' *** constant heat flux = ', rn_geoflx_cst |
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| 157 | qgh_trd0(:,:) = ro0cpr * rn_geoflx_cst |
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| 158 | ! |
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| 159 | CASE ( 2 ) !* variable geothermal heat flux : read the geothermal fluxes in mW/m2 |
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| 160 | IF(lwp) WRITE(numout,*) ' *** variable geothermal heat flux' |
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| 161 | CALL iom_open ( 'geothermal_heating.nc', inum ) |
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| 162 | CALL iom_get ( inum, jpdom_data, 'heatflow', qgh_trd0 ) |
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| 163 | CALL iom_close( inum ) |
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| 164 | qgh_trd0(:,:) = ro0cpr * qgh_trd0(:,:) * 1.e-3 ! conversion in W/m2 |
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| 165 | ! |
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| 166 | CASE DEFAULT |
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| 167 | WRITE(ctmp1,*) ' bad flag value for nn_geoflx = ', nn_geoflx |
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| 168 | CALL ctl_stop( ctmp1 ) |
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| 169 | ! |
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| 170 | END SELECT |
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[503] | 171 | ! |
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[2528] | 172 | ELSE |
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| 173 | IF(lwp) WRITE(numout,*) ' *** no geothermal heat flux' |
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| 174 | ENDIF |
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[1601] | 175 | ! |
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[3] | 176 | END SUBROUTINE tra_bbc_init |
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| 177 | |
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| 178 | !!====================================================================== |
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| 179 | END MODULE trabbc |
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