[3] | 1 | MODULE traqsr |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE traqsr *** |
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| 4 | !! Ocean physics: solar radiation penetration in the top ocean levels |
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| 5 | !!====================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! tra_qsr : trend due to the solar radiation penetration |
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| 9 | !! tra_qsr_init : solar radiation penetration initialization |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! * Modules used |
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| 12 | USE oce ! ocean dynamics and active tracers |
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| 13 | USE dom_oce ! ocean space and time domain |
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| 14 | USE trdtra_oce ! ocean active tracer trends |
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| 15 | USE in_out_manager ! I/O manager |
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| 16 | |
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| 17 | USE ocesbc ! thermohaline fluxes |
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| 18 | USE phycst ! physical constants |
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| 19 | |
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| 20 | IMPLICIT NONE |
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| 21 | PRIVATE |
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| 22 | |
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| 23 | !! * Routine accessibility |
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| 24 | PUBLIC tra_qsr ! routine called by step.F90 (ln_traqsr=T) |
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| 25 | PUBLIC tra_qsr_init ! routine called by opa.F90 |
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| 26 | |
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[32] | 27 | !! * Shared module variables |
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| 28 | LOGICAL, PUBLIC :: ln_traqsr = .TRUE. !: qsr flag (Default=T) |
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[3] | 29 | |
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| 30 | !! * Module variables |
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| 31 | REAL(wp) :: & !!! * penetrative solar radiation namelist * |
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| 32 | rabs = 0.58_wp, & ! fraction associated with xsi1 |
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| 33 | xsi1 = 0.35_wp, & ! first depth of extinction |
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| 34 | xsi2 = 23.0_wp ! second depth of extinction |
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| 35 | ! ! (default values: water type Ib) |
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| 36 | INTEGER :: & |
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| 37 | nksr ! number of levels |
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| 38 | REAL(wp), DIMENSION(jpk) :: & |
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| 39 | gdsr ! profile of the solar flux penetration |
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| 40 | |
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| 41 | !! * Substitutions |
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| 42 | # include "domzgr_substitute.h90" |
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| 43 | # include "vectopt_loop_substitute.h90" |
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| 44 | !!---------------------------------------------------------------------- |
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| 45 | !! OPA 9.0 , LODYC-IPSL (2003) |
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| 46 | !!---------------------------------------------------------------------- |
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| 47 | |
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| 48 | CONTAINS |
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| 49 | |
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| 50 | SUBROUTINE tra_qsr( kt ) |
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| 51 | !!---------------------------------------------------------------------- |
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| 52 | !! *** ROUTINE tra_qsr *** |
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| 53 | !! |
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| 54 | !! ** Purpose : Compute the temperature trend due to the solar radiation |
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| 55 | !! penetration and add it to the general temperature trend. |
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| 56 | !! |
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| 57 | !! ** Method : The profile of the solar radiation within the ocean is |
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| 58 | !! defined through two penetration length scale (xsr1,xsr2) and a |
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| 59 | !! ratio (rabs) as : |
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| 60 | !! I(k) = Qsr*( rabs*EXP(z(k)/xsr1) + (1.-rabs)*EXP(z(k)/xsr2) ) |
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| 61 | !! The temperature trend associated with the solar radiation |
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| 62 | !! penetration is given by : |
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| 63 | !! zta = 1/e3t dk[ I ] / (rau0*Cp) |
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| 64 | !! At the bottom, boudary condition for the radiation is no flux : |
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| 65 | !! all heat which has not been absorbed in the above levels is put |
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| 66 | !! in the last ocean level. |
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| 67 | !! In z-coordinate case, the computation is only done down to the |
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| 68 | !! level where I(k) < 1.e-15 W/m2. In addition, the coefficients |
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| 69 | !! used for the computation are calculated one for once as they |
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| 70 | !! depends on k only. |
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| 71 | !! |
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| 72 | !! ** Action : - update ta with the penetrative solar radiation trend |
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| 73 | !! - save the trend in ttrd ('key_trdtra') |
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| 74 | !! |
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| 75 | !! History : |
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| 76 | !! 6.0 ! 90-10 (B. Blanke) Original code |
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| 77 | !! 7.0 ! 91-11 (G. Madec) |
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| 78 | !! ! 96-01 (G. Madec) s-coordinates |
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| 79 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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| 80 | !!---------------------------------------------------------------------- |
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| 81 | !! * Arguments |
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| 82 | INTEGER, INTENT( in ) :: kt ! ocean time-step |
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| 83 | |
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| 84 | !! * Local declarations |
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| 85 | INTEGER :: ji, jj, jk ! dummy loop indexes |
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| 86 | REAL(wp) :: zc0, zta ! temporary scalars |
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| 87 | REAL(wp) :: zc1 , zc2 , & ! temporary scalars |
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| 88 | zdp1, zdp2 ! |
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| 89 | !!---------------------------------------------------------------------- |
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| 90 | |
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| 91 | IF( kt == nit000 ) THEN |
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| 92 | IF ( lwp ) WRITE(numout,*) |
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| 93 | IF ( lwp ) WRITE(numout,*) 'tra_qsr : penetration of the surface solar radiation' |
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| 94 | IF ( lwp ) WRITE(numout,*) '~~~~~~~' |
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| 95 | ENDIF |
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| 96 | |
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| 97 | ! ! =================== ! |
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| 98 | IF( lk_sco ) THEN ! s-coordinate ! |
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| 99 | ! ! =================== ! |
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| 100 | ! |
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| 101 | ! ! =============== |
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| 102 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 103 | ! ! =============== |
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| 104 | DO jj = 2, jpjm1 |
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| 105 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 106 | |
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| 107 | zdp1 = -fsdepw(ji,jj,jk ) ! compute the qsr trend |
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| 108 | zdp2 = -fsdepw(ji,jj,jk+1) |
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| 109 | zc0 = qsr(ji,jj) * ro0cpr / fse3t(ji,jj,jk) |
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| 110 | zc1 = ( rabs * EXP(zdp1/xsi1) + (1.-rabs) * EXP(zdp1/xsi2) ) |
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| 111 | zc2 = - ( rabs * EXP(zdp2/xsi1) + (1.-rabs) * EXP(zdp2/xsi2) ) |
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| 112 | zta = zc0 * ( zc1 * tmask(ji,jj,jk) + zc2 * tmask(ji,jj,jk+1) ) |
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| 113 | |
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| 114 | ta(ji,jj,jk) = ta(ji,jj,jk) + zta ! add qsr trend to the temperature trend |
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| 115 | |
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| 116 | # if defined key_trdtra || defined key_trdmld |
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| 117 | ttrd(ji,jj,jk,7) = zta ! save the qsr trend |
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| 118 | # endif |
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| 119 | END DO |
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| 120 | END DO |
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| 121 | ! ! =============== |
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| 122 | END DO ! End of slab |
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| 123 | ! ! =============== |
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| 124 | ENDIF |
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| 125 | ! ! =================== ! |
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| 126 | IF( lk_zps ) THEN ! partial steps ! |
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| 127 | ! ! =================== ! |
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| 128 | ! |
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| 129 | ! ! =============== |
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| 130 | DO jk = 1, nksr ! Horizontal slab |
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| 131 | ! ! =============== |
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| 132 | DO jj = 2, jpjm1 |
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| 133 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 134 | |
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| 135 | zc0 = qsr(ji,jj) / fse3t(ji,jj,jk) ! compute the qsr trend |
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| 136 | zta = zc0 * ( gdsr(jk) * tmask(ji,jj,jk) - gdsr(jk+1) * tmask(ji,jj,jk+1) ) |
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| 137 | |
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| 138 | ta(ji,jj,jk) = ta(ji,jj,jk) + zta ! add qsr trend to the temperature trend |
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| 139 | |
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| 140 | # if defined key_trdtra || defined key_trdmld |
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| 141 | ttrd(ji,jj,jk,7) = zta ! save the qsr trend |
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| 142 | # endif |
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| 143 | END DO |
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| 144 | END DO |
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| 145 | ! ! =============== |
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| 146 | END DO ! End of slab |
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| 147 | ! ! =============== |
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| 148 | ENDIF |
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| 149 | ! ! =================== ! |
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| 150 | IF( lk_zco ) THEN ! z-coordinate ! |
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| 151 | ! ! =================== ! |
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| 152 | ! |
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| 153 | ! ! =============== |
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| 154 | DO jk = 1, nksr ! Horizontal slab |
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| 155 | ! ! =============== |
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| 156 | zc0 = 1. / fse3t(1,1,jk) |
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| 157 | DO jj = 2, jpjm1 |
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| 158 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 159 | ! ! compute qsr forcing trend |
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| 160 | zta = qsr(ji,jj) * zc0 * ( gdsr(jk)*tmask(ji,jj,jk) - gdsr(jk+1)*tmask(ji,jj,jk+1) ) |
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| 161 | |
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| 162 | ta(ji,jj,jk) = ta(ji,jj,jk) + zta ! add qsr trend to the temperature trend |
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| 163 | |
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| 164 | # if defined key_trdtra || defined key_trdmld |
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| 165 | ttrd(ji,jj,jk,7) = zta ! save the qsr forcing trend |
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| 166 | # endif |
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| 167 | END DO |
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| 168 | END DO |
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| 169 | ! ! =============== |
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| 170 | END DO ! End of slab |
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| 171 | ! ! =============== |
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| 172 | ENDIF |
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| 173 | |
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| 174 | IF( l_ctl .AND. lwp ) THEN ! print mean trends (used for debugging) |
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| 175 | zta = SUM( ta(2:jpim1,2:jpjm1,1:jpkm1) * tmask(2:jpim1,2:jpjm1,1:jpkm1) ) |
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| 176 | zta = SUM( ta * tmask ) |
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| 177 | WRITE(numout,*) ' qsr - Ta: ', zta-t_ctl |
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| 178 | t_ctl = zta |
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| 179 | ENDIF |
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| 180 | |
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| 181 | |
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| 182 | ! 2. Substract qsr from the total heat flux q |
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| 183 | ! ------------------------------------------- |
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| 184 | DO jj = 2, jpjm1 |
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| 185 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 186 | q(ji,jj) = qt(ji,jj) - qsr(ji,jj) |
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| 187 | END DO |
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| 188 | END DO |
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| 189 | |
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| 190 | END SUBROUTINE tra_qsr |
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| 191 | |
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| 192 | |
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| 193 | SUBROUTINE tra_qsr_init |
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| 194 | !!---------------------------------------------------------------------- |
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| 195 | !! *** ROUTINE tra_qsr_init *** |
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| 196 | !! |
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| 197 | !! ** Purpose : Initialization for the penetrative solar radiation |
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| 198 | !! |
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| 199 | !! ** Method : The profile of solar radiation within the ocean is set |
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| 200 | !! from two length scale of penetration (xsr1,xsr2) and a ratio |
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| 201 | !! (rabs). These parameters are read in the namqsr namelist. The |
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| 202 | !! default values correspond to clear water (type I in Jerlov' |
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| 203 | !! (1968) classification. |
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| 204 | !! called by tra_qsr at the first timestep (nit000) |
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| 205 | !! |
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| 206 | !! ** Action : - initialize xsr1, xsr2 and rabs |
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| 207 | !! |
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| 208 | !! Reference : |
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| 209 | !! Jerlov, N. G., 1968 Optical Oceanography, Elsevier, 194pp. |
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| 210 | !! |
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| 211 | !! History : |
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| 212 | !! 8.5 ! 02-06 (G. Madec) Original code |
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| 213 | !!---------------------------------------------------------------------- |
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| 214 | !! * Local declarations |
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| 215 | INTEGER :: jk, & ! dummy loop index |
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| 216 | indic ! temporary integer |
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| 217 | REAL(wp) :: zdp1 ! temporary scalar |
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| 218 | |
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| 219 | NAMELIST/namqsr/ ln_traqsr, rabs, xsi1, xsi2 |
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| 220 | !!---------------------------------------------------------------------- |
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| 221 | |
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| 222 | ! Read Namelist namqsr : ratio and length of penetration |
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| 223 | ! -------------------- |
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| 224 | REWIND ( numnam ) |
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| 225 | READ ( numnam, namqsr ) |
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| 226 | |
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| 227 | ! Parameter control and print |
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| 228 | ! --------------------------- |
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| 229 | IF( ln_traqsr ) THEN |
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| 230 | IF ( lwp ) THEN |
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| 231 | WRITE(numout,*) |
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| 232 | WRITE(numout,*) 'tra_qsr_init : penetration of the surface solar radiation' |
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| 233 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 234 | WRITE(numout,*) ' Namelist namqsr : set the parameter of penetration' |
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| 235 | WRITE(numout,*) ' fraction associated with xsi rabs = ',rabs |
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| 236 | WRITE(numout,*) ' first depth of extinction xsi1 = ',xsi1 |
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| 237 | WRITE(numout,*) ' second depth of extinction xsi2 = ',xsi2 |
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| 238 | WRITE(numout,*) |
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| 239 | END IF |
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| 240 | ELSE |
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| 241 | IF ( lwp ) THEN |
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| 242 | WRITE(numout,*) |
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| 243 | WRITE(numout,*) 'tra_qsr_init : NO solar flux penetration' |
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| 244 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 245 | END IF |
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| 246 | ENDIF |
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| 247 | |
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| 248 | IF( rabs > 1.e0 .OR. rabs < 0.e0 .OR. xsi1 < 0.e0 .OR. xsi2 < 0.e0 ) THEN |
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| 249 | IF(lwp) WRITE(numout,cform_err) |
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| 250 | IF(lwp) WRITE(numout,*) ' 0<rabs<1, 0<xsi1, or 0<xsi2 not satisfied' |
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| 251 | nstop = nstop + 1 |
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| 252 | ENDIF |
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| 253 | |
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| 254 | |
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| 255 | ! Initialization |
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| 256 | ! -------------- |
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| 257 | IF( .NOT. lk_sco ) THEN |
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| 258 | ! z-coordinate with or without partial step : same before last ocean w-level everywhere |
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| 259 | DO jk = 1, jpk |
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| 260 | zdp1 = -fsdepw(1,1,jk) |
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| 261 | gdsr(jk) = ro0cpr * ( rabs * EXP( zdp1/xsi1 ) + (1.-rabs) * EXP( zdp1/xsi2 ) ) |
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| 262 | END DO |
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| 263 | indic = 0 |
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| 264 | DO jk = 1, jpk |
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| 265 | IF( gdsr(jk) <= 1.e-15 .AND. indic == 0 ) THEN |
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| 266 | gdsr(jk) = 0.e0 |
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| 267 | nksr = jk |
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| 268 | !!bug Edmee chg res nksr = jk - 1 |
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| 269 | indic = 1 |
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| 270 | ENDIF |
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| 271 | END DO |
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| 272 | nksr = MIN( nksr, jpkm1 ) |
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| 273 | IF(lwp) THEN |
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| 274 | WRITE(numout,*) |
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| 275 | WRITE(numout,*) ' - z-coordinate, level max of computation =', nksr |
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| 276 | WRITE(numout,*) ' profile of coef. of penetration:' |
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| 277 | WRITE(numout,"(' ',7e11.2)") ( gdsr(jk), jk = 1, nksr ) |
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| 278 | WRITE(numout,*) |
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| 279 | ENDIF |
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| 280 | ENDIF |
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| 281 | |
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| 282 | END SUBROUTINE tra_qsr_init |
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| 283 | |
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| 284 | !!====================================================================== |
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| 285 | END MODULE traqsr |
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