[2198] | 1 | MODULE sbcdcy |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcdcy *** |
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| 4 | !! Ocean forcing: compute the diurnal cycle |
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| 5 | !!====================================================================== |
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| 6 | !! History : OPA ! 2005-02 (D. Bernie) Original code |
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| 7 | !! NEMO 2.0 ! 2006-02 (S. Masson, G. Madec) adaptation to NEMO |
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| 8 | !! 3.1 ! 2009-07 (J.M. Molines) adaptation to v3.1 |
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[12182] | 9 | !! 4.* ! 2019-10 (L. Brodeau) nothing really new, but the routine |
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| 10 | !! ! "sbc_dcy_param" has been extracted from old function "sbc_dcy" |
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| 11 | !! ! => this allows the warm-layer param of COARE3* to know the time |
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| 12 | !! ! of dawn and dusk even if "ln_dm2dc=.false." (rdawn_dcy & rdusk_dcy |
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| 13 | !! ! are now public) |
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[2198] | 14 | !!---------------------------------------------------------------------- |
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| 15 | |
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| 16 | !!---------------------------------------------------------------------- |
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[2715] | 17 | !! sbc_dcy : solar flux at kt from daily mean, taking diurnal cycle into account |
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[2198] | 18 | !!---------------------------------------------------------------------- |
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| 19 | USE oce ! ocean dynamics and tracers |
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| 20 | USE phycst ! ocean physics |
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| 21 | USE dom_oce ! ocean space and time domain |
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[2228] | 22 | USE sbc_oce ! Surface boundary condition: ocean fields |
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[9124] | 23 | ! |
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[2198] | 24 | USE in_out_manager ! I/O manager |
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[2715] | 25 | USE lib_mpp ! MPP library |
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[2198] | 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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[12182] | 29 | |
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[2715] | 30 | INTEGER, PUBLIC :: nday_qsr !: day when parameters were computed |
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[12182] | 31 | |
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[2715] | 32 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: raa , rbb , rcc , rab ! diurnal cycle parameters |
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[12182] | 33 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: rtmd, rscal ! - - - |
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| 34 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: rdawn_dcy, rdusk_dcy ! - - - |
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| 35 | |
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[2715] | 36 | PUBLIC sbc_dcy ! routine called by sbc |
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[12182] | 37 | PUBLIC sbc_dcy_param ! routine used here and called by warm-layer parameterization (sbcblk_skin_coare*) |
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[2198] | 38 | |
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[12340] | 39 | !! * Substitutions |
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| 40 | # include "do_loop_substitute.h90" |
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[2198] | 41 | !!---------------------------------------------------------------------- |
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[10068] | 42 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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[12182] | 43 | !! $Id$ |
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[10068] | 44 | !! Software governed by the CeCILL license (see ./LICENSE) |
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[2198] | 45 | !!---------------------------------------------------------------------- |
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| 46 | CONTAINS |
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| 47 | |
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[12182] | 48 | INTEGER FUNCTION sbc_dcy_alloc() |
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| 49 | !!---------------------------------------------------------------------- |
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| 50 | !! *** FUNCTION sbc_dcy_alloc *** |
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| 51 | !!---------------------------------------------------------------------- |
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| 52 | ALLOCATE( raa (jpi,jpj) , rbb (jpi,jpj) , rcc (jpi,jpj) , rab (jpi,jpj) , & |
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| 53 | & rtmd(jpi,jpj) , rdawn_dcy(jpi,jpj) , rdusk_dcy(jpi,jpj) , rscal(jpi,jpj) , STAT=sbc_dcy_alloc ) |
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| 54 | ! |
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| 55 | CALL mpp_sum ( 'sbcdcy', sbc_dcy_alloc ) |
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| 56 | IF( sbc_dcy_alloc /= 0 ) CALL ctl_stop( 'STOP', 'sbc_dcy_alloc: failed to allocate arrays' ) |
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| 57 | END FUNCTION sbc_dcy_alloc |
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[2715] | 58 | |
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| 59 | |
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[3651] | 60 | FUNCTION sbc_dcy( pqsrin, l_mask ) RESULT( zqsrout ) |
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[2198] | 61 | !!---------------------------------------------------------------------- |
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| 62 | !! *** ROUTINE sbc_dcy *** |
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| 63 | !! |
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| 64 | !! ** Purpose : introduce a diurnal cycle of qsr from daily values |
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| 65 | !! |
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| 66 | !! ** Method : see Appendix A of Bernie et al. 2007. |
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| 67 | !! |
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| 68 | !! ** Action : redistribute daily QSR on each time step following the diurnal cycle |
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| 69 | !! |
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| 70 | !! reference : Bernie, DJ, E Guilyardi, G Madec, JM Slingo, and SJ Woolnough, 2007 |
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[12182] | 71 | !! Impact of resolving the diurnal cycle in an ocean--atmosphere GCM. |
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[2198] | 72 | !! Part 1: a diurnally forced OGCM. Climate Dynamics 29:6, 575-590. |
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| 73 | !!---------------------------------------------------------------------- |
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[9124] | 74 | LOGICAL , OPTIONAL , INTENT(in) :: l_mask ! use the routine for night mask computation |
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[12182] | 75 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pqsrin ! input daily QSR flux |
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[9124] | 76 | REAL(wp), DIMENSION(jpi,jpj) :: zqsrout ! output QSR flux with diurnal cycle |
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[2198] | 77 | !! |
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[2228] | 78 | INTEGER :: ji, jj ! dummy loop indices |
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[3651] | 79 | INTEGER, DIMENSION(jpi,jpj) :: imask_night ! night mask |
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[2198] | 80 | REAL(wp) :: zlo, zup, zlousd, zupusd |
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[12182] | 81 | REAL(wp) :: ztmp, ztmp1, ztmp2 |
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[3651] | 82 | REAL(wp) :: ztmpm, ztmpm1, ztmpm2 |
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[2198] | 83 | !!--------------------------------------------------------------------- |
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[3294] | 84 | ! |
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[2198] | 85 | ! Initialization |
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| 86 | ! -------------- |
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| 87 | ! When are we during the day (from 0 to 1) |
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[6140] | 88 | zlo = ( REAL(nsec_day, wp) - 0.5_wp * rdt ) / rday |
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| 89 | zup = zlo + ( REAL(nn_fsbc, wp) * rdt ) / rday |
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[12182] | 90 | ! |
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| 91 | IF( nday_qsr == -1 ) THEN ! first time step only |
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[2198] | 92 | IF(lwp) THEN |
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| 93 | WRITE(numout,*) |
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| 94 | WRITE(numout,*) 'sbc_dcy : introduce diurnal cycle from daily mean qsr' |
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| 95 | WRITE(numout,*) '~~~~~~~' |
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| 96 | WRITE(numout,*) |
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| 97 | ENDIF |
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[12182] | 98 | ENDIF |
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| 99 | |
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| 100 | ! Setting parameters for each new day: |
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| 101 | CALL sbc_dcy_param() |
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| 102 | |
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| 103 | !CALL iom_put( "rdusk_dcy", rdusk_dcy(:,:)*tmask(:,:,1) ) !LB |
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| 104 | !CALL iom_put( "rdawn_dcy", rdawn_dcy(:,:)*tmask(:,:,1) ) !LB |
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| 105 | !CALL iom_put( "rscal_dcy", rscal(:,:)*tmask(:,:,1) ) !LB |
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| 106 | |
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| 107 | |
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| 108 | ! 3. update qsr with the diurnal cycle |
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| 109 | ! ------------------------------------ |
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| 110 | |
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| 111 | imask_night(:,:) = 0 |
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[12340] | 112 | DO_2D_11_11 |
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| 113 | ztmpm = 0._wp |
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| 114 | IF( ABS(rab(ji,jj)) < 1. ) THEN ! day duration is less than 24h |
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| 115 | ! |
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| 116 | IF( rdawn_dcy(ji,jj) < rdusk_dcy(ji,jj) ) THEN ! day time in one part |
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| 117 | zlousd = MAX(zlo, rdawn_dcy(ji,jj)) |
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| 118 | zlousd = MIN(zlousd, zup) |
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| 119 | zupusd = MIN(zup, rdusk_dcy(ji,jj)) |
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| 120 | zupusd = MAX(zupusd, zlo) |
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| 121 | ztmp = fintegral(zlousd, zupusd, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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| 122 | zqsrout(ji,jj) = pqsrin(ji,jj) * ztmp * rscal(ji,jj) |
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| 123 | ztmpm = zupusd - zlousd |
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| 124 | IF( ztmpm .EQ. 0 ) imask_night(ji,jj) = 1 |
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[12182] | 125 | ! |
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[12340] | 126 | ELSE ! day time in two parts |
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| 127 | zlousd = MIN(zlo, rdusk_dcy(ji,jj)) |
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| 128 | zupusd = MIN(zup, rdusk_dcy(ji,jj)) |
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| 129 | ztmp1 = fintegral(zlousd, zupusd, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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| 130 | ztmpm1=zupusd-zlousd |
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| 131 | zlousd = MAX(zlo, rdawn_dcy(ji,jj)) |
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| 132 | zupusd = MAX(zup, rdawn_dcy(ji,jj)) |
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| 133 | ztmp2 = fintegral(zlousd, zupusd, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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| 134 | ztmpm2 =zupusd-zlousd |
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| 135 | ztmp = ztmp1 + ztmp2 |
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| 136 | ztmpm = ztmpm1 + ztmpm2 |
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| 137 | zqsrout(ji,jj) = pqsrin(ji,jj) * ztmp * rscal(ji,jj) |
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| 138 | IF(ztmpm .EQ. 0.) imask_night(ji,jj) = 1 |
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| 139 | ENDIF |
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| 140 | ELSE ! 24h light or 24h night |
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| 141 | ! |
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| 142 | IF( raa(ji,jj) > rbb(ji,jj) ) THEN ! 24h day |
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| 143 | ztmp = fintegral(zlo, zup, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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| 144 | zqsrout(ji,jj) = pqsrin(ji,jj) * ztmp * rscal(ji,jj) |
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| 145 | imask_night(ji,jj) = 0 |
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[12182] | 146 | ! |
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[12340] | 147 | ELSE ! No day |
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| 148 | zqsrout(ji,jj) = 0.0_wp |
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| 149 | imask_night(ji,jj) = 1 |
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[12182] | 150 | ENDIF |
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[12340] | 151 | ENDIF |
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| 152 | END_2D |
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[12182] | 153 | ! |
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| 154 | IF( PRESENT(l_mask) .AND. l_mask ) THEN |
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| 155 | zqsrout(:,:) = float(imask_night(:,:)) |
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| 156 | ENDIF |
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| 157 | ! |
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| 158 | END FUNCTION sbc_dcy |
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| 159 | |
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| 160 | |
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| 161 | SUBROUTINE sbc_dcy_param( ) |
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| 162 | !! |
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| 163 | INTEGER :: ji, jj ! dummy loop indices |
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| 164 | !INTEGER, DIMENSION(jpi,jpj) :: imask_night ! night mask |
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| 165 | REAL(wp) :: zdsws, zdecrad, ztx, zsin, zcos |
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| 166 | REAL(wp) :: ztmp, ztest |
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| 167 | !---------------------------statement functions------------------------ |
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| 168 | ! |
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| 169 | IF( nday_qsr == -1 ) THEN ! first time step only |
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[2715] | 170 | ! allocate sbcdcy arrays |
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| 171 | IF( sbc_dcy_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'sbc_dcy_alloc : unable to allocate arrays' ) |
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[2198] | 172 | ! Compute rcc needed to compute the time integral of the diurnal cycle |
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[12182] | 173 | rcc(:,:) = rad * glamt(:,:) - rpi |
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[2198] | 174 | ! time of midday |
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[3764] | 175 | rtmd(:,:) = 0.5_wp - glamt(:,:) / 360._wp |
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| 176 | rtmd(:,:) = MOD( (rtmd(:,:) + 1._wp) , 1._wp) |
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[2198] | 177 | ENDIF |
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| 178 | |
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[12182] | 179 | ! If this is a new day, we have to update the dawn, dusk and scaling function |
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[2198] | 180 | !---------------------- |
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| 181 | |
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[12182] | 182 | ! 2.1 dawn and dusk |
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| 183 | |
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| 184 | ! nday is the number of days since the beginning of the current month |
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| 185 | IF( nday_qsr /= nday ) THEN |
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[2198] | 186 | ! save the day of the year and the daily mean of qsr |
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[12182] | 187 | nday_qsr = nday |
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| 188 | ! number of days since the previous winter solstice (supposed to be always 21 December) |
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[2228] | 189 | zdsws = REAL(11 + nday_year, wp) |
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[2198] | 190 | ! declination of the earths orbit |
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[12182] | 191 | zdecrad = (-23.5_wp * rad) * COS( zdsws * 2._wp*rpi / REAL(nyear_len(1),wp) ) |
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[2198] | 192 | ! Compute A and B needed to compute the time integral of the diurnal cycle |
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[3651] | 193 | |
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[2228] | 194 | zsin = SIN( zdecrad ) ; zcos = COS( zdecrad ) |
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[12340] | 195 | DO_2D_11_11 |
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| 196 | ztmp = rad * gphit(ji,jj) |
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| 197 | raa(ji,jj) = SIN( ztmp ) * zsin |
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| 198 | rbb(ji,jj) = COS( ztmp ) * zcos |
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| 199 | END_2D |
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[2198] | 200 | ! Compute the time of dawn and dusk |
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| 201 | |
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[12182] | 202 | ! rab to test if the day time is equal to 0, less than 24h of full day |
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[2198] | 203 | rab(:,:) = -raa(:,:) / rbb(:,:) |
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[12340] | 204 | DO_2D_11_11 |
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| 205 | IF( ABS(rab(ji,jj)) < 1._wp ) THEN ! day duration is less than 24h |
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| 206 | ! When is it night? |
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| 207 | ztx = 1._wp/(2._wp*rpi) * (ACOS(rab(ji,jj)) - rcc(ji,jj)) |
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| 208 | ztest = -rbb(ji,jj) * SIN( rcc(ji,jj) + 2._wp*rpi * ztx ) |
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| 209 | ! is it dawn or dusk? |
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| 210 | IF( ztest > 0._wp ) THEN |
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| 211 | rdawn_dcy(ji,jj) = ztx |
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| 212 | rdusk_dcy(ji,jj) = rtmd(ji,jj) + ( rtmd(ji,jj) - rdawn_dcy(ji,jj) ) |
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[2198] | 213 | ELSE |
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[12340] | 214 | rdusk_dcy(ji,jj) = ztx |
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| 215 | rdawn_dcy(ji,jj) = rtmd(ji,jj) - ( rdusk_dcy(ji,jj) - rtmd(ji,jj) ) |
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[2198] | 216 | ENDIF |
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[12340] | 217 | ELSE |
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| 218 | rdawn_dcy(ji,jj) = rtmd(ji,jj) + 0.5_wp |
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| 219 | rdusk_dcy(ji,jj) = rdawn_dcy(ji,jj) |
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| 220 | ENDIF |
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| 221 | END_2D |
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[12182] | 222 | rdawn_dcy(:,:) = MOD( (rdawn_dcy(:,:) + 1._wp), 1._wp ) |
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| 223 | rdusk_dcy(:,:) = MOD( (rdusk_dcy(:,:) + 1._wp), 1._wp ) |
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[3764] | 224 | ! 2.2 Compute the scaling function: |
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| 225 | ! S* = the inverse of the time integral of the diurnal cycle from dawn to dusk |
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| 226 | ! Avoid possible infinite scaling factor, associated with very short daylight |
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| 227 | ! periods, by ignoring periods less than 1/1000th of a day (ticket #1040) |
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[12340] | 228 | DO_2D_11_11 |
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| 229 | IF( ABS(rab(ji,jj)) < 1._wp ) THEN ! day duration is less than 24h |
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| 230 | rscal(ji,jj) = 0.0_wp |
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| 231 | IF( rdawn_dcy(ji,jj) < rdusk_dcy(ji,jj) ) THEN ! day time in one part |
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| 232 | IF( (rdusk_dcy(ji,jj) - rdawn_dcy(ji,jj) ) .ge. 0.001_wp ) THEN |
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| 233 | rscal(ji,jj) = fintegral(rdawn_dcy(ji,jj), rdusk_dcy(ji,jj), raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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[3764] | 234 | rscal(ji,jj) = 1._wp / rscal(ji,jj) |
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[2198] | 235 | ENDIF |
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[12340] | 236 | ELSE ! day time in two parts |
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| 237 | IF( (rdusk_dcy(ji,jj) + (1._wp - rdawn_dcy(ji,jj)) ) .ge. 0.001_wp ) THEN |
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| 238 | rscal(ji,jj) = fintegral(0._wp, rdusk_dcy(ji,jj), raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) & |
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| 239 | & + fintegral(rdawn_dcy(ji,jj), 1._wp, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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| 240 | rscal(ji,jj) = 1. / rscal(ji,jj) |
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| 241 | ENDIF |
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[2198] | 242 | ENDIF |
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[12340] | 243 | ELSE |
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| 244 | IF( raa(ji,jj) > rbb(ji,jj) ) THEN ! 24h day |
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| 245 | rscal(ji,jj) = fintegral(0._wp, 1._wp, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
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| 246 | rscal(ji,jj) = 1._wp / rscal(ji,jj) |
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| 247 | ELSE ! No day |
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| 248 | rscal(ji,jj) = 0.0_wp |
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| 249 | ENDIF |
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| 250 | ENDIF |
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| 251 | END_2D |
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[2198] | 252 | ! |
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[6140] | 253 | ztmp = rday / ( rdt * REAL(nn_fsbc, wp) ) |
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[2198] | 254 | rscal(:,:) = rscal(:,:) * ztmp |
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[2715] | 255 | ! |
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[12182] | 256 | ENDIF !IF( nday_qsr /= nday ) |
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[2198] | 257 | ! |
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[12182] | 258 | END SUBROUTINE sbc_dcy_param |
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[2198] | 259 | |
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[12182] | 260 | |
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| 261 | FUNCTION fintegral( pt1, pt2, paaa, pbbb, pccc ) |
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| 262 | REAL(wp), INTENT(in) :: pt1, pt2, paaa, pbbb, pccc |
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| 263 | REAL(wp) :: fintegral |
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| 264 | fintegral = paaa * pt2 + 1._wp/(2._wp*rpi) * pbbb * SIN(pccc + 2._wp*rpi*pt2) & |
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| 265 | & - paaa * pt1 - 1._wp/(2._wp*rpi) * pbbb * SIN(pccc + 2._wp*rpi*pt1) |
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| 266 | END FUNCTION fintegral |
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| 267 | |
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[2198] | 268 | !!====================================================================== |
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| 269 | END MODULE sbcdcy |
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