[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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[3] | 24 | |
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| 25 | IMPLICIT NONE |
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| 26 | PRIVATE |
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| 27 | |
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| 28 | PUBLIC tra_bbc ! routine called by step.F90 |
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[2528] | 29 | PUBLIC tra_bbc_init ! routine called by opa.F90 |
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[3] | 30 | |
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[2528] | 31 | ! !!* Namelist nambbc: bottom boundary condition * |
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| 32 | LOGICAL, PUBLIC :: ln_trabbc = .FALSE. !: Geothermal heat flux flag |
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| 33 | INTEGER :: nn_geoflx = 1 ! Geothermal flux (=1:constant flux, =2:read in file ) |
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| 34 | REAL(wp) :: rn_geoflx_cst = 86.4e-3_wp ! Constant value of geothermal heat flux |
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[3] | 35 | |
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[2528] | 36 | REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: qgh_trd0 ! geothermal heating trend |
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[3] | 37 | |
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| 38 | !! * Substitutions |
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| 39 | # include "domzgr_substitute.h90" |
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| 40 | !!---------------------------------------------------------------------- |
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[2528] | 41 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 42 | !! $Id $ |
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| 43 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 44 | !!---------------------------------------------------------------------- |
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| 45 | CONTAINS |
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| 46 | |
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| 47 | SUBROUTINE tra_bbc( kt ) |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! *** ROUTINE tra_bbc *** |
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| 50 | !! |
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| 51 | !! ** Purpose : Compute the bottom boundary contition on temperature |
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[1601] | 52 | !! associated with geothermal heating and add it to the |
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| 53 | !! general trend of temperature equations. |
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[3] | 54 | !! |
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| 55 | !! ** Method : The geothermal heat flux set to its constant value of |
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[1601] | 56 | !! 86.4 mW/m2 (Stein and Stein 1992, Huang 1999). |
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[3] | 57 | !! The temperature trend associated to this heat flux through the |
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| 58 | !! ocean bottom can be computed once and is added to the temperature |
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| 59 | !! trend juste above the bottom at each time step: |
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[2528] | 60 | !! ta = ta + Qsf / (rau0 rcp e3T) for k= mbkt |
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[3] | 61 | !! Where Qsf is the geothermal heat flux. |
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| 62 | !! |
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| 63 | !! ** Action : - update the temperature trends (ta) with the trend of |
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| 64 | !! the ocean bottom boundary condition |
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| 65 | !! |
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[503] | 66 | !! References : Stein, C. A., and S. Stein, 1992, Nature, 359, 123-129. |
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[1601] | 67 | !! Emile-Geay and Madec, 2009, Ocean Science. |
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[503] | 68 | !!---------------------------------------------------------------------- |
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[2690] | 69 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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[503] | 70 | !! |
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[2528] | 71 | INTEGER :: ji, jj, ik ! dummy loop indices |
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| 72 | REAL(wp) :: zqgh_trd ! geothermal heat flux trend |
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[2690] | 73 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: ztrdt |
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[3] | 74 | !!---------------------------------------------------------------------- |
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[2528] | 75 | ! |
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[503] | 76 | IF( l_trdtra ) THEN ! Save ta and sa trends |
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[2528] | 77 | ALLOCATE( ztrdt(jpi,jpj,jpk) ) ; ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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[503] | 78 | ENDIF |
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| 79 | ! |
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[2528] | 80 | ! ! Add the geothermal heat flux trend on temperature |
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[789] | 81 | #if defined key_vectopt_loop |
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[2528] | 82 | DO jj = 1, 1 |
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| 83 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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[3] | 84 | #else |
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[2528] | 85 | DO jj = 2, jpjm1 |
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| 86 | DO ji = 2, jpim1 |
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[1601] | 87 | #endif |
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[2528] | 88 | ik = mbkt(ji,jj) |
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| 89 | zqgh_trd = qgh_trd0(ji,jj) / fse3t(ji,jj,ik) |
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| 90 | tsa(ji,jj,ik,jp_tem) = tsa(ji,jj,ik,jp_tem) + zqgh_trd |
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[3] | 91 | END DO |
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[2528] | 92 | END DO |
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| 93 | ! |
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[503] | 94 | IF( l_trdtra ) THEN ! Save the geothermal heat flux trend for diagnostics |
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[2528] | 95 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) |
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| 96 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_trd_bbc, ztrdt ) |
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| 97 | DEALLOCATE( ztrdt ) |
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[3] | 98 | ENDIF |
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[503] | 99 | ! |
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[2528] | 100 | IF(ln_ctl) CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' bbc - Ta: ', mask1=tmask, clinfo3='tra-ta' ) |
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[503] | 101 | ! |
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[3] | 102 | END SUBROUTINE tra_bbc |
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| 103 | |
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| 104 | |
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| 105 | SUBROUTINE tra_bbc_init |
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| 106 | !!---------------------------------------------------------------------- |
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| 107 | !! *** ROUTINE tra_bbc_init *** |
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| 108 | !! |
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[1601] | 109 | !! ** Purpose : Compute once for all the trend associated with geothermal |
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| 110 | !! heating that will be applied at each time step at the |
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| 111 | !! last ocean level |
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[3] | 112 | !! |
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| 113 | !! ** Method : Read the nambbc namelist and check the parameters. |
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| 114 | !! |
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| 115 | !! ** Input : - Namlist nambbc |
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| 116 | !! - NetCDF file : geothermal_heating.nc ( if necessary ) |
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| 117 | !! |
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[592] | 118 | !! ** Action : - read/fix the geothermal heat qgh_trd0 |
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[3] | 119 | !!---------------------------------------------------------------------- |
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[473] | 120 | USE iom |
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[503] | 121 | !! |
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[3] | 122 | INTEGER :: ji, jj ! dummy loop indices |
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[473] | 123 | INTEGER :: inum ! temporary logical unit |
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[1601] | 124 | !! |
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[2528] | 125 | NAMELIST/nambbc/ln_trabbc, nn_geoflx, rn_geoflx_cst |
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[3] | 126 | !!---------------------------------------------------------------------- |
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| 127 | |
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[2528] | 128 | REWIND( numnam ) ! Read Namelist nambbc : bottom momentum boundary condition |
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| 129 | READ ( numnam, nambbc ) |
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[3] | 130 | |
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[2528] | 131 | IF(lwp) THEN ! Control print |
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[1601] | 132 | WRITE(numout,*) |
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[2528] | 133 | WRITE(numout,*) 'tra_bbc : Bottom Boundary Condition (bbc), apply a Geothermal heating' |
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[1601] | 134 | WRITE(numout,*) '~~~~~~~ ' |
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| 135 | WRITE(numout,*) ' Namelist nambbc : set bbc parameters' |
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[2528] | 136 | WRITE(numout,*) ' Apply a geothermal heating at ocean bottom ln_trabbc = ', ln_trabbc |
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| 137 | WRITE(numout,*) ' type of geothermal flux nn_geoflx = ', nn_geoflx |
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| 138 | WRITE(numout,*) ' Constant geothermal flux value rn_geoflx_cst = ', rn_geoflx_cst |
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[1601] | 139 | WRITE(numout,*) |
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| 140 | ENDIF |
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[3] | 141 | |
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[2528] | 142 | IF( ln_trabbc ) THEN !== geothermal heating ==! |
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[503] | 143 | ! |
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[2528] | 144 | ALLOCATE( qgh_trd0(jpi,jpj) ) ! allocation |
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[503] | 145 | ! |
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[2528] | 146 | SELECT CASE ( nn_geoflx ) ! geothermal heat flux / (rauO * Cp) |
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[503] | 147 | ! |
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[2528] | 148 | CASE ( 1 ) !* constant flux |
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| 149 | IF(lwp) WRITE(numout,*) ' *** constant heat flux = ', rn_geoflx_cst |
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| 150 | qgh_trd0(:,:) = ro0cpr * rn_geoflx_cst |
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| 151 | ! |
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| 152 | CASE ( 2 ) !* variable geothermal heat flux : read the geothermal fluxes in mW/m2 |
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| 153 | IF(lwp) WRITE(numout,*) ' *** variable geothermal heat flux' |
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| 154 | CALL iom_open ( 'geothermal_heating.nc', inum ) |
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| 155 | CALL iom_get ( inum, jpdom_data, 'heatflow', qgh_trd0 ) |
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| 156 | CALL iom_close( inum ) |
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| 157 | qgh_trd0(:,:) = ro0cpr * qgh_trd0(:,:) * 1.e-3 ! conversion in W/m2 |
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| 158 | ! |
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| 159 | CASE DEFAULT |
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| 160 | WRITE(ctmp1,*) ' bad flag value for nn_geoflx = ', nn_geoflx |
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| 161 | CALL ctl_stop( ctmp1 ) |
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| 162 | ! |
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| 163 | END SELECT |
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[503] | 164 | ! |
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[2528] | 165 | ELSE |
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| 166 | IF(lwp) WRITE(numout,*) ' *** no geothermal heat flux' |
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| 167 | ENDIF |
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[1601] | 168 | ! |
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[3] | 169 | END SUBROUTINE tra_bbc_init |
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| 170 | |
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| 171 | !!====================================================================== |
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| 172 | END MODULE trabbc |
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