| 1 | MODULE trc_oce |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trc_oce *** |
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| 4 | !! Ocean passive tracer : share SMS/Ocean variables |
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| 5 | !!====================================================================== |
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| 6 | !! History : 1.0 ! 2004-03 (C. Ethe) Original code |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! trc_oce_rgb : tabulated attenuation coefficients for RGB light penetration |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | USE par_oce |
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| 13 | USE in_out_manager ! I/O manager |
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| 14 | USE dom_oce ! ocean space and time domain |
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| 15 | USE lib_mpp ! MPP library |
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| 16 | |
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| 17 | USE yomhook, ONLY: lhook, dr_hook |
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| 18 | USE parkind1, ONLY: jprb, jpim |
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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 | PUBLIC trc_oce_rgb ! routine called by traqsr.F90 |
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| 24 | PUBLIC trc_oce_rgb_read ! routine called by traqsr.F90 |
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| 25 | PUBLIC trc_oce_ext_lev ! function called by traqsr.F90 at least |
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| 26 | PUBLIC trc_oce_alloc ! function called by nemogcm.F90 |
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| 27 | |
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| 28 | INTEGER , PUBLIC :: nn_dttrc !: frequency of step on passive tracers |
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| 29 | REAL(wp), PUBLIC :: r_si2 !: largest depth of extinction (blue & 0.01 mg.m-3) (RGB) |
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| 30 | REAL(wp), PUBLIC, SAVE, ALLOCATABLE, DIMENSION(:,:,:) :: etot3 !: light absortion coefficient |
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| 31 | REAL(wp), PUBLIC, SAVE, ALLOCATABLE, DIMENSION(:,:,:) :: facvol !: volume for degraded regions |
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| 32 | |
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| 33 | #if defined key_top |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | !! 'key_top' bio-model |
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| 36 | !!---------------------------------------------------------------------- |
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| 37 | LOGICAL, PUBLIC, PARAMETER :: lk_top = .TRUE. !: TOP model |
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| 38 | LOGICAL, PUBLIC, PARAMETER :: lk_qsr_bio = .TRUE. !: bio-model light absorption flag |
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| 39 | #else |
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| 40 | !!---------------------------------------------------------------------- |
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| 41 | !! Default option No bio-model light absorption |
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| 42 | !!---------------------------------------------------------------------- |
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| 43 | LOGICAL, PUBLIC, PARAMETER :: lk_top = .FALSE. !: TOP model |
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| 44 | LOGICAL, PUBLIC, PARAMETER :: lk_qsr_bio = .FALSE. !: bio-model light absorption flag |
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| 45 | #endif |
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| 46 | |
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| 47 | #if defined key_offline |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! 'key_offline' OFFLINE mode |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | LOGICAL, PUBLIC, PARAMETER :: lk_offline = .TRUE. !: offline flag |
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| 52 | #else |
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| 53 | !!---------------------------------------------------------------------- |
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| 54 | !! Default option NO OFFLINE mode |
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| 55 | !!---------------------------------------------------------------------- |
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| 56 | LOGICAL, PUBLIC, PARAMETER :: lk_offline = .FALSE. !: offline flag |
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| 57 | #endif |
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| 58 | #if defined key_degrad |
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| 59 | !!---------------------------------------------------------------------- |
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| 60 | !! 'key_degrad' Degradation mode |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | LOGICAL, PUBLIC, PARAMETER :: lk_degrad = .TRUE. !: degradation flag |
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| 63 | #else |
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| 64 | !!---------------------------------------------------------------------- |
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| 65 | !! Default option NO Degradation mode |
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| 66 | !!---------------------------------------------------------------------- |
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| 67 | LOGICAL, PUBLIC, PARAMETER :: lk_degrad = .FALSE. !: degradation flag |
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| 68 | #endif |
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| 69 | |
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| 70 | !! * Substitutions |
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| 71 | # include "domzgr_substitute.h90" |
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| 72 | !!---------------------------------------------------------------------- |
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| 73 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 74 | !! $Id$ |
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| 75 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 76 | !!---------------------------------------------------------------------- |
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| 77 | CONTAINS |
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| 78 | |
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| 79 | INTEGER FUNCTION trc_oce_alloc() |
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| 80 | !!---------------------------------------------------------------------- |
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| 81 | !! *** trc_oce_alloc *** |
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| 82 | !!---------------------------------------------------------------------- |
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| 83 | INTEGER :: ierr(2) ! Local variables |
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| 84 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 85 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 86 | REAL(KIND=jprb) :: zhook_handle |
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| 87 | |
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| 88 | CHARACTER(LEN=*), PARAMETER :: RoutineName='TRC_OCE_ALLOC' |
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| 89 | |
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| 90 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 91 | |
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| 92 | !!---------------------------------------------------------------------- |
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| 93 | ierr(:) = 0 |
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| 94 | ALLOCATE( etot3 (jpi,jpj,jpk), STAT=ierr(1) ) |
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| 95 | IF( lk_degrad) ALLOCATE( facvol(jpi,jpj,jpk), STAT=ierr(2) ) |
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| 96 | trc_oce_alloc = MAXVAL( ierr ) |
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| 97 | ! |
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| 98 | IF( trc_oce_alloc /= 0 ) CALL ctl_warn('trc_oce_alloc: failed to allocate etot3 array') |
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| 99 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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| 100 | END FUNCTION trc_oce_alloc |
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| 101 | |
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| 102 | |
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| 103 | SUBROUTINE trc_oce_rgb( prgb ) |
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| 104 | !!--------------------------------------------------------------------- |
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| 105 | !! *** ROUTINE p4z_opt_init *** |
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| 106 | !! |
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| 107 | !! ** Purpose : Initialization of of the optical scheme |
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| 108 | !! |
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| 109 | !! ** Method : Set a look up table for the optical coefficients |
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| 110 | !! i.e. the attenuation coefficient for R-G-B light |
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| 111 | !! tabulated in Chlorophyll class (from JM Andre) |
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| 112 | !! |
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| 113 | !! ** Action : prgb(3,61) tabulated R-G-B attenuation coef. |
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| 114 | !! |
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| 115 | !! Reference : Lengaigne et al. 2007, Clim. Dyn., V28, 5, 503-516. |
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| 116 | !!---------------------------------------------------------------------- |
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| 117 | REAL(wp), DIMENSION(3,61), INTENT(out) :: prgb ! tabulated attenuation coefficient |
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| 118 | !! |
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| 119 | INTEGER :: jc ! dummy loop indice |
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| 120 | INTEGER :: irgb ! temporary integer |
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| 121 | REAL(wp) :: zchl ! temporary scalar |
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| 122 | REAL(wp), DIMENSION(4,61) :: zrgb ! tabulated attenuation coefficient (formerly read in 'kRGB61.txt') |
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| 123 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 124 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 125 | REAL(KIND=jprb) :: zhook_handle |
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| 126 | |
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| 127 | CHARACTER(LEN=*), PARAMETER :: RoutineName='TRC_OCE_RGB' |
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| 128 | |
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| 129 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 130 | |
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| 131 | !!---------------------------------------------------------------------- |
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| 132 | ! |
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| 133 | IF(lwp) THEN |
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| 134 | WRITE(numout,*) |
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| 135 | WRITE(numout,*) 'trc_oce_rgb : Initialisation of the optical look-up table' |
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| 136 | WRITE(numout,*) '~~~~~~~~~~~ ' |
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| 137 | ENDIF |
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| 138 | ! |
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| 139 | ! Chlorophyll ! Blue attenuation ! Green attenuation ! Red attenuation ! |
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| 140 | zrgb(1, 1) = 0.010 ; zrgb(2, 1) = 0.01618 ; zrgb(3, 1) = 0.07464 ; zrgb(4, 1) = 0.37807 |
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| 141 | zrgb(1, 2) = 0.011 ; zrgb(2, 2) = 0.01654 ; zrgb(3, 2) = 0.07480 ; zrgb(4, 2) = 0.37823 |
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| 142 | zrgb(1, 3) = 0.013 ; zrgb(2, 3) = 0.01693 ; zrgb(3, 3) = 0.07499 ; zrgb(4, 3) = 0.37840 |
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| 143 | zrgb(1, 4) = 0.014 ; zrgb(2, 4) = 0.01736 ; zrgb(3, 4) = 0.07518 ; zrgb(4, 4) = 0.37859 |
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| 144 | zrgb(1, 5) = 0.016 ; zrgb(2, 5) = 0.01782 ; zrgb(3, 5) = 0.07539 ; zrgb(4, 5) = 0.37879 |
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| 145 | zrgb(1, 6) = 0.018 ; zrgb(2, 6) = 0.01831 ; zrgb(3, 6) = 0.07562 ; zrgb(4, 6) = 0.37900 |
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| 146 | zrgb(1, 7) = 0.020 ; zrgb(2, 7) = 0.01885 ; zrgb(3, 7) = 0.07586 ; zrgb(4, 7) = 0.37923 |
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| 147 | zrgb(1, 8) = 0.022 ; zrgb(2, 8) = 0.01943 ; zrgb(3, 8) = 0.07613 ; zrgb(4, 8) = 0.37948 |
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| 148 | zrgb(1, 9) = 0.025 ; zrgb(2, 9) = 0.02005 ; zrgb(3, 9) = 0.07641 ; zrgb(4, 9) = 0.37976 |
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| 149 | zrgb(1,10) = 0.028 ; zrgb(2,10) = 0.02073 ; zrgb(3,10) = 0.07672 ; zrgb(4,10) = 0.38005 |
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| 150 | zrgb(1,11) = 0.032 ; zrgb(2,11) = 0.02146 ; zrgb(3,11) = 0.07705 ; zrgb(4,11) = 0.38036 |
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| 151 | zrgb(1,12) = 0.035 ; zrgb(2,12) = 0.02224 ; zrgb(3,12) = 0.07741 ; zrgb(4,12) = 0.38070 |
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| 152 | zrgb(1,13) = 0.040 ; zrgb(2,13) = 0.02310 ; zrgb(3,13) = 0.07780 ; zrgb(4,13) = 0.38107 |
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| 153 | zrgb(1,14) = 0.045 ; zrgb(2,14) = 0.02402 ; zrgb(3,14) = 0.07821 ; zrgb(4,14) = 0.38146 |
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| 154 | zrgb(1,15) = 0.050 ; zrgb(2,15) = 0.02501 ; zrgb(3,15) = 0.07866 ; zrgb(4,15) = 0.38189 |
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| 155 | zrgb(1,16) = 0.056 ; zrgb(2,16) = 0.02608 ; zrgb(3,16) = 0.07914 ; zrgb(4,16) = 0.38235 |
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| 156 | zrgb(1,17) = 0.063 ; zrgb(2,17) = 0.02724 ; zrgb(3,17) = 0.07967 ; zrgb(4,17) = 0.38285 |
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| 157 | zrgb(1,18) = 0.071 ; zrgb(2,18) = 0.02849 ; zrgb(3,18) = 0.08023 ; zrgb(4,18) = 0.38338 |
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| 158 | zrgb(1,19) = 0.079 ; zrgb(2,19) = 0.02984 ; zrgb(3,19) = 0.08083 ; zrgb(4,19) = 0.38396 |
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| 159 | zrgb(1,20) = 0.089 ; zrgb(2,20) = 0.03131 ; zrgb(3,20) = 0.08149 ; zrgb(4,20) = 0.38458 |
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| 160 | zrgb(1,21) = 0.100 ; zrgb(2,21) = 0.03288 ; zrgb(3,21) = 0.08219 ; zrgb(4,21) = 0.38526 |
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| 161 | zrgb(1,22) = 0.112 ; zrgb(2,22) = 0.03459 ; zrgb(3,22) = 0.08295 ; zrgb(4,22) = 0.38598 |
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| 162 | zrgb(1,23) = 0.126 ; zrgb(2,23) = 0.03643 ; zrgb(3,23) = 0.08377 ; zrgb(4,23) = 0.38676 |
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| 163 | zrgb(1,24) = 0.141 ; zrgb(2,24) = 0.03842 ; zrgb(3,24) = 0.08466 ; zrgb(4,24) = 0.38761 |
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| 164 | zrgb(1,25) = 0.158 ; zrgb(2,25) = 0.04057 ; zrgb(3,25) = 0.08561 ; zrgb(4,25) = 0.38852 |
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| 165 | zrgb(1,26) = 0.178 ; zrgb(2,26) = 0.04289 ; zrgb(3,26) = 0.08664 ; zrgb(4,26) = 0.38950 |
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| 166 | zrgb(1,27) = 0.200 ; zrgb(2,27) = 0.04540 ; zrgb(3,27) = 0.08775 ; zrgb(4,27) = 0.39056 |
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| 167 | zrgb(1,28) = 0.224 ; zrgb(2,28) = 0.04811 ; zrgb(3,28) = 0.08894 ; zrgb(4,28) = 0.39171 |
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| 168 | zrgb(1,29) = 0.251 ; zrgb(2,29) = 0.05103 ; zrgb(3,29) = 0.09023 ; zrgb(4,29) = 0.39294 |
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| 169 | zrgb(1,30) = 0.282 ; zrgb(2,30) = 0.05420 ; zrgb(3,30) = 0.09162 ; zrgb(4,30) = 0.39428 |
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| 170 | zrgb(1,31) = 0.316 ; zrgb(2,31) = 0.05761 ; zrgb(3,31) = 0.09312 ; zrgb(4,31) = 0.39572 |
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| 171 | zrgb(1,32) = 0.355 ; zrgb(2,32) = 0.06130 ; zrgb(3,32) = 0.09474 ; zrgb(4,32) = 0.39727 |
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| 172 | zrgb(1,33) = 0.398 ; zrgb(2,33) = 0.06529 ; zrgb(3,33) = 0.09649 ; zrgb(4,33) = 0.39894 |
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| 173 | zrgb(1,34) = 0.447 ; zrgb(2,34) = 0.06959 ; zrgb(3,34) = 0.09837 ; zrgb(4,34) = 0.40075 |
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| 174 | zrgb(1,35) = 0.501 ; zrgb(2,35) = 0.07424 ; zrgb(3,35) = 0.10040 ; zrgb(4,35) = 0.40270 |
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| 175 | zrgb(1,36) = 0.562 ; zrgb(2,36) = 0.07927 ; zrgb(3,36) = 0.10259 ; zrgb(4,36) = 0.40480 |
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| 176 | zrgb(1,37) = 0.631 ; zrgb(2,37) = 0.08470 ; zrgb(3,37) = 0.10495 ; zrgb(4,37) = 0.40707 |
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| 177 | zrgb(1,38) = 0.708 ; zrgb(2,38) = 0.09056 ; zrgb(3,38) = 0.10749 ; zrgb(4,38) = 0.40952 |
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| 178 | zrgb(1,39) = 0.794 ; zrgb(2,39) = 0.09690 ; zrgb(3,39) = 0.11024 ; zrgb(4,39) = 0.41216 |
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| 179 | zrgb(1,40) = 0.891 ; zrgb(2,40) = 0.10374 ; zrgb(3,40) = 0.11320 ; zrgb(4,40) = 0.41502 |
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| 180 | zrgb(1,41) = 1.000 ; zrgb(2,41) = 0.11114 ; zrgb(3,41) = 0.11639 ; zrgb(4,41) = 0.41809 |
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| 181 | zrgb(1,42) = 1.122 ; zrgb(2,42) = 0.11912 ; zrgb(3,42) = 0.11984 ; zrgb(4,42) = 0.42142 |
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| 182 | zrgb(1,43) = 1.259 ; zrgb(2,43) = 0.12775 ; zrgb(3,43) = 0.12356 ; zrgb(4,43) = 0.42500 |
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| 183 | zrgb(1,44) = 1.413 ; zrgb(2,44) = 0.13707 ; zrgb(3,44) = 0.12757 ; zrgb(4,44) = 0.42887 |
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| 184 | zrgb(1,45) = 1.585 ; zrgb(2,45) = 0.14715 ; zrgb(3,45) = 0.13189 ; zrgb(4,45) = 0.43304 |
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| 185 | zrgb(1,46) = 1.778 ; zrgb(2,46) = 0.15803 ; zrgb(3,46) = 0.13655 ; zrgb(4,46) = 0.43754 |
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| 186 | zrgb(1,47) = 1.995 ; zrgb(2,47) = 0.16978 ; zrgb(3,47) = 0.14158 ; zrgb(4,47) = 0.44240 |
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| 187 | zrgb(1,48) = 2.239 ; zrgb(2,48) = 0.18248 ; zrgb(3,48) = 0.14701 ; zrgb(4,48) = 0.44765 |
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| 188 | zrgb(1,49) = 2.512 ; zrgb(2,49) = 0.19620 ; zrgb(3,49) = 0.15286 ; zrgb(4,49) = 0.45331 |
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| 189 | zrgb(1,50) = 2.818 ; zrgb(2,50) = 0.21102 ; zrgb(3,50) = 0.15918 ; zrgb(4,50) = 0.45942 |
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| 190 | zrgb(1,51) = 3.162 ; zrgb(2,51) = 0.22703 ; zrgb(3,51) = 0.16599 ; zrgb(4,51) = 0.46601 |
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| 191 | zrgb(1,52) = 3.548 ; zrgb(2,52) = 0.24433 ; zrgb(3,52) = 0.17334 ; zrgb(4,52) = 0.47313 |
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| 192 | zrgb(1,53) = 3.981 ; zrgb(2,53) = 0.26301 ; zrgb(3,53) = 0.18126 ; zrgb(4,53) = 0.48080 |
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| 193 | zrgb(1,54) = 4.467 ; zrgb(2,54) = 0.28320 ; zrgb(3,54) = 0.18981 ; zrgb(4,54) = 0.48909 |
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| 194 | zrgb(1,55) = 5.012 ; zrgb(2,55) = 0.30502 ; zrgb(3,55) = 0.19903 ; zrgb(4,55) = 0.49803 |
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| 195 | zrgb(1,56) = 5.623 ; zrgb(2,56) = 0.32858 ; zrgb(3,56) = 0.20898 ; zrgb(4,56) = 0.50768 |
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| 196 | zrgb(1,57) = 6.310 ; zrgb(2,57) = 0.35404 ; zrgb(3,57) = 0.21971 ; zrgb(4,57) = 0.51810 |
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| 197 | zrgb(1,58) = 7.079 ; zrgb(2,58) = 0.38154 ; zrgb(3,58) = 0.23129 ; zrgb(4,58) = 0.52934 |
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| 198 | zrgb(1,59) = 7.943 ; zrgb(2,59) = 0.41125 ; zrgb(3,59) = 0.24378 ; zrgb(4,59) = 0.54147 |
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| 199 | zrgb(1,60) = 8.912 ; zrgb(2,60) = 0.44336 ; zrgb(3,60) = 0.25725 ; zrgb(4,60) = 0.55457 |
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| 200 | zrgb(1,61) = 10.000 ; zrgb(2,61) = 0.47804 ; zrgb(3,61) = 0.27178 ; zrgb(4,61) = 0.56870 |
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| 201 | ! |
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| 202 | prgb(:,:) = zrgb(2:4,:) |
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| 203 | ! |
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| 204 | r_si2 = 1.e0 / zrgb(2, 1) ! blue with the smallest chlorophyll concentration) |
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| 205 | IF(lwp) WRITE(numout,*) ' RGB longest depth of extinction r_si2 = ', r_si2 |
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| 206 | ! |
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| 207 | DO jc = 1, 61 ! check |
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| 208 | zchl = zrgb(1,jc) |
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| 209 | irgb = NINT( 41 + 20.* LOG10( zchl ) + 1.e-15 ) |
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| 210 | IF(lwp) WRITE(numout,*) ' jc =', jc, ' Chl = ', zchl, ' irgb = ', irgb |
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| 211 | IF( irgb /= jc ) THEN |
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| 212 | IF(lwp) WRITE(numout,*) ' jc =', jc, ' Chl = ', zchl, ' Chl class = ', irgb |
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| 213 | CALL ctl_stop( 'trc_oce_rgb : inconsistency in Chl tabulated attenuation coeff.' ) |
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| 214 | ENDIF |
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| 215 | END DO |
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| 216 | ! |
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| 217 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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| 218 | END SUBROUTINE trc_oce_rgb |
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| 219 | |
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| 220 | |
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| 221 | SUBROUTINE trc_oce_rgb_read( prgb ) |
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| 222 | !!---------------------------------------------------------------------- |
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| 223 | !! *** ROUTINE p4z_opt_init *** |
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| 224 | !! |
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| 225 | !! ** Purpose : Initialization of of the optical scheme |
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| 226 | !! |
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| 227 | !! ** Method : read the look up table for the optical coefficients |
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| 228 | !! |
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| 229 | !! ** input : xkrgb(61) precomputed array corresponding to the |
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| 230 | !! attenuation coefficient (from JM Andre) |
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| 231 | !!---------------------------------------------------------------------- |
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| 232 | REAL(wp), DIMENSION(3,61), INTENT(out) :: prgb ! tabulated attenuation coefficient |
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| 233 | !! |
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| 234 | INTEGER :: jc, jb ! dummy loop indice |
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| 235 | INTEGER :: irgb ! temporary integer |
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| 236 | REAL(wp) :: zchl ! temporary scalar |
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| 237 | INTEGER :: numlight |
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| 238 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 239 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 240 | REAL(KIND=jprb) :: zhook_handle |
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| 241 | |
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| 242 | CHARACTER(LEN=*), PARAMETER :: RoutineName='TRC_OCE_RGB_READ' |
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| 243 | |
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| 244 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 245 | |
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| 246 | !!---------------------------------------------------------------------- |
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| 247 | ! |
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| 248 | IF(lwp) THEN ! control print |
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| 249 | WRITE(numout,*) |
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| 250 | WRITE(numout,*) ' trc_oce_rgb_read : optical look-up table read in kRGB61.txt file' |
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| 251 | WRITE(numout,*) ' ~~~~~~~~~~~~~~~~' |
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| 252 | WRITE(numout,*) |
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| 253 | ENDIF |
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| 254 | ! |
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| 255 | CALL ctl_opn( numlight, 'kRGB61.txt', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, numout, lwp ) |
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| 256 | DO jc = 1, 61 |
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| 257 | READ(numlight,*) zchl, ( prgb(jb,jc), jb = 1, 3 ) |
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| 258 | irgb = NINT( 41 + 20.* LOG10( zchl ) + 1.e-15 ) |
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| 259 | IF(lwp) WRITE(numout,*) ' jc =', jc, ' Chl = ', zchl, ' irgb = ', irgb |
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| 260 | IF( irgb /= jc ) THEN |
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| 261 | IF(lwp) WRITE(numout,*) ' jc =', jc, ' Chl = ', zchl, ' Chl class = ', irgb |
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| 262 | CALL ctl_stop( 'trc_oce_rgb_read : inconsistency in Chl tabulated attenuation coeff.' ) |
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| 263 | ENDIF |
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| 264 | END DO |
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| 265 | CLOSE( numlight ) |
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| 266 | ! |
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| 267 | r_si2 = 1.e0 / prgb(1, 1) ! blue with the smallest chlorophyll concentration) |
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| 268 | IF(lwp) WRITE(numout,*) ' RGB longest depth of extinction r_si2 = ', r_si2 |
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| 269 | ! |
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| 270 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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| 271 | END SUBROUTINE trc_oce_rgb_read |
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| 272 | |
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| 273 | |
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| 274 | FUNCTION trc_oce_ext_lev( prldex, pqsr_frc ) RESULT( pjl ) |
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| 275 | !!---------------------------------------------------------------------- |
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| 276 | !! *** ROUTINE trc_oce_ext_lev *** |
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| 277 | !! |
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| 278 | !! ** Purpose : compute max. level for light penetration |
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| 279 | !! |
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| 280 | !! ** Method : the function provides the level at which irradiance |
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| 281 | !! becomes negligible (i.e. = 1.e-15 W/m2) for 3 or 2 bands light |
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| 282 | !! penetration: I(z) = pqsr_frc * EXP(hext/prldex) = 1.e-15 W/m2 |
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| 283 | !! # prldex is the longest depth of extinction: |
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| 284 | !! - prldex = 23 m (2 bands case) |
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| 285 | !! - prldex = 62 m (3 bands case: blue waveband & 0.01 mg/m2 for the chlorophyll) |
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| 286 | !! # pqsr_frc is the fraction of solar radiation which penetrates, |
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| 287 | !! considering Qsr=240 W/m2 and rn_abs = 0.58: |
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| 288 | !! - pqsr_frc = Qsr * (1-rn_abs) = 1.00e2 W/m2 (2 bands case) |
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| 289 | !! - pqsr_frc = Qsr * (1-rn_abs)/3 = 0.33e2 W/m2 (3 bands case & equi-partition) |
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| 290 | !! |
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| 291 | !!---------------------------------------------------------------------- |
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| 292 | REAL(wp), INTENT(in) :: prldex ! longest depth of extinction |
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| 293 | REAL(wp), INTENT(in) :: pqsr_frc ! frac. solar radiation which penetrates |
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| 294 | !! |
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| 295 | INTEGER :: jk, pjl ! levels |
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| 296 | REAL(wp) :: zhext ! deepest level till which light penetrates |
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| 297 | REAL(wp) :: zprec = 15._wp ! precision to reach -LOG10(1.e-15) |
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| 298 | REAL(wp) :: zem ! temporary scalar |
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| 299 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 300 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 301 | REAL(KIND=jprb) :: zhook_handle |
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| 302 | |
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| 303 | CHARACTER(LEN=*), PARAMETER :: RoutineName='TRC_OCE_EXT_LEV' |
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| 304 | |
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| 305 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 306 | |
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| 307 | !!---------------------------------------------------------------------- |
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| 308 | ! |
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| 309 | ! It is not necessary to compute anything below the following depth |
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| 310 | zhext = prldex * ( LOG(10._wp) * zprec + LOG(pqsr_frc) ) |
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| 311 | ! |
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| 312 | ! Level of light extinction |
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| 313 | pjl = jpkm1 |
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| 314 | DO jk = jpkm1, 1, -1 |
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| 315 | IF(SUM(tmask(:,:,jk)) > 0 ) THEN |
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| 316 | zem = MAXVAL( fsdepw(:,:,jk+1) * tmask(:,:,jk) ) |
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| 317 | IF( zem >= zhext ) pjl = jk ! last T-level reached by Qsr |
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| 318 | ELSE |
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| 319 | pjl = jk ! or regional sea-bed depth |
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| 320 | ENDIF |
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| 321 | END DO |
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| 322 | ! |
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| 323 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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| 324 | END FUNCTION trc_oce_ext_lev |
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| 325 | |
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| 326 | !!====================================================================== |
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| 327 | END MODULE trc_oce |
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