[10989] | 1 | MODULE diu_coolskin |
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[5676] | 2 | !!====================================================================== |
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[10989] | 3 | !! *** MODULE diu_coolskin *** |
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[5676] | 4 | !! Cool skin thickness and delta T correction using Artele et al. (2002) |
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| 5 | !! [see also Tu and Tsuang (2005)] |
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| 6 | !! |
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| 7 | !!===================================================================== |
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| 8 | !! History : ! 2012-01 (P. Sykes) Original code |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | |
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| 11 | !!---------------------------------------------------------------------- |
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[7646] | 12 | !! diurnal_sst_coolskin_init : initialisation of the cool skin |
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| 13 | !! diurnal_sst_coolskin_step : time-stepping of the cool skin corrections |
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[5676] | 14 | !!---------------------------------------------------------------------- |
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| 15 | USE par_kind |
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| 16 | USE phycst |
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| 17 | USE dom_oce |
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| 18 | USE in_out_manager |
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| 19 | USE sbc_oce |
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[6493] | 20 | USE lib_mpp |
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[5676] | 21 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 22 | |
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| 23 | IMPLICIT NONE |
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[7646] | 24 | PRIVATE |
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| 25 | |
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[5676] | 26 | ! Namelist parameters |
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| 27 | |
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| 28 | ! Parameters |
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| 29 | REAL(wp), PRIVATE, PARAMETER :: pp_k = 0.596_wp ! Thermal conductivity of seawater |
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| 30 | REAL(wp), PRIVATE, PARAMETER :: pp_v = 1.05e-6_wp ! Kinematic viscosity of seawater |
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| 31 | REAL(wp), PRIVATE, PARAMETER :: pp_C = 86400 ! seconds [see Tu and Tsuang (2005)] |
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| 32 | REAL(wp), PRIVATE, PARAMETER :: pp_cw = 3993._wp ! specific heat capacity of seawater |
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| 33 | REAL(wp), PRIVATE, PARAMETER :: pp_h = 10._wp ! reference depth [using 10m from Artale et al. (2002)] |
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| 34 | REAL(wp), PRIVATE, PARAMETER :: pp_rhoa = 1.20421_wp ! density of air (at 20C) |
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| 35 | REAL(wp), PRIVATE, PARAMETER :: pp_cda = 1.45e-3_wp ! assumed air-sea drag coefficient for calculating wind speed |
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| 36 | |
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| 37 | ! Key variables |
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| 38 | REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: x_csdsst ! Cool skin delta SST |
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| 39 | REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: x_csthick ! Cool skin thickness |
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| 40 | PUBLIC diurnal_sst_coolskin_step, diurnal_sst_coolskin_init |
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| 41 | |
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| 42 | !! * Substitutions |
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[12340] | 43 | # include "do_loop_substitute.h90" |
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[7646] | 44 | !!---------------------------------------------------------------------- |
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[10068] | 45 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 46 | !! $Id$ |
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| 47 | !! Software governed by the CeCILL license (see ./LICENSE) |
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[7646] | 48 | !!---------------------------------------------------------------------- |
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[5676] | 49 | CONTAINS |
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| 50 | |
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| 51 | SUBROUTINE diurnal_sst_coolskin_init |
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| 52 | !!---------------------------------------------------------------------- |
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| 53 | !! *** ROUTINE diurnal_sst_coolskin_init *** |
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| 54 | !! |
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| 55 | !! ** Purpose : initialise the cool skin model |
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| 56 | !! |
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| 57 | !! ** Method : |
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| 58 | !! |
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| 59 | !! ** Reference : |
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| 60 | !! |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | ALLOCATE( x_csdsst(jpi,jpj), x_csthick(jpi,jpj) ) |
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| 63 | x_csdsst = 0. |
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| 64 | x_csthick = 0. |
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[7646] | 65 | ! |
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[5676] | 66 | END SUBROUTINE diurnal_sst_coolskin_init |
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[7646] | 67 | |
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| 68 | |
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[12489] | 69 | SUBROUTINE diurnal_sst_coolskin_step(psqflux, pstauflux, psrho, pDt) |
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[5676] | 70 | !!---------------------------------------------------------------------- |
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| 71 | !! *** ROUTINE diurnal_sst_takaya_step *** |
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| 72 | !! |
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| 73 | !! ** Purpose : Time-step the Artale cool skin model |
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| 74 | !! |
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| 75 | !! ** Method : |
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| 76 | !! |
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| 77 | !! ** Reference : |
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| 78 | !!---------------------------------------------------------------------- |
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| 79 | ! Dummy variables |
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| 80 | REAL(wp), INTENT(IN), DIMENSION(jpi,jpj) :: psqflux ! Heat (non-solar)(Watts) |
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| 81 | REAL(wp), INTENT(IN), DIMENSION(jpi,jpj) :: pstauflux ! Wind stress (kg/ m s^2) |
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| 82 | REAL(wp), INTENT(IN), DIMENSION(jpi,jpj) :: psrho ! Water density (kg/m^3) |
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[12489] | 83 | REAL(wp), INTENT(IN) :: pDt ! Time-step |
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[5676] | 84 | |
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| 85 | ! Local variables |
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| 86 | REAL(wp), DIMENSION(jpi,jpj) :: z_fv ! Friction velocity |
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| 87 | REAL(wp), DIMENSION(jpi,jpj) :: z_gamma ! Dimensionless function of wind speed |
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| 88 | REAL(wp), DIMENSION(jpi,jpj) :: z_lamda ! Sauders (dimensionless) proportionality constant |
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| 89 | REAL(wp), DIMENSION(jpi,jpj) :: z_wspd ! Wind speed (m/s) |
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| 90 | REAL(wp) :: z_ztx ! Temporary u wind stress |
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| 91 | REAL(wp) :: z_zty ! Temporary v wind stress |
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| 92 | REAL(wp) :: z_zmod ! Temporary total wind stress |
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| 93 | |
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| 94 | INTEGER :: ji,jj |
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[7646] | 95 | !!---------------------------------------------------------------------- |
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| 96 | ! |
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[13942] | 97 | IF( .NOT. (ln_blk .OR. ln_abl) ) CALL ctl_stop("diu_coolskin.f90: diurnal flux processing only implemented for bulk forcing") |
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[7646] | 98 | ! |
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[13295] | 99 | DO_2D( 1, 1, 1, 1 ) |
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[12340] | 100 | ! |
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| 101 | ! Calcualte wind speed from wind stress and friction velocity |
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| 102 | IF( tmask(ji,jj,1) == 1. .AND. pstauflux(ji,jj) /= 0 .AND. psrho(ji,jj) /=0 ) THEN |
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| 103 | z_fv(ji,jj) = SQRT( pstauflux(ji,jj) / psrho(ji,jj) ) |
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| 104 | z_wspd(ji,jj) = SQRT( pstauflux(ji,jj) / ( pp_cda * pp_rhoa ) ) |
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| 105 | ELSE |
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| 106 | z_fv(ji,jj) = 0. |
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| 107 | z_wspd(ji,jj) = 0. |
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| 108 | ENDIF |
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| 109 | ! |
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| 110 | ! Calculate gamma function which is dependent upon wind speed |
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| 111 | IF( tmask(ji,jj,1) == 1. ) THEN |
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| 112 | IF( ( z_wspd(ji,jj) <= 7.5 ) ) z_gamma(ji,jj) = ( 0.2 * z_wspd(ji,jj) ) + 0.5 |
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| 113 | IF( ( z_wspd(ji,jj) > 7.5 ) .AND. ( z_wspd(ji,jj) < 10. ) ) z_gamma(ji,jj) = ( 1.6 * z_wspd(ji,jj) ) - 10. |
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| 114 | IF( ( z_wspd(ji,jj) >= 10. ) ) z_gamma(ji,jj) = 6. |
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| 115 | ENDIF |
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| 116 | ! |
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| 117 | ! Calculate lamda function |
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| 118 | IF( tmask(ji,jj,1) == 1. .AND. z_fv(ji,jj) /= 0 ) THEN |
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| 119 | z_lamda(ji,jj) = ( z_fv(ji,jj) * pp_k * pp_C ) / ( z_gamma(ji,jj) * psrho(ji,jj) * pp_cw * pp_h * pp_v ) |
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| 120 | ELSE |
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| 121 | z_lamda(ji,jj) = 0. |
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| 122 | ENDIF |
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| 123 | ! |
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| 124 | ! Calculate the cool skin thickness - only when heat flux is out of the ocean |
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| 125 | IF( tmask(ji,jj,1) == 1. .AND. z_fv(ji,jj) /= 0 .AND. psqflux(ji,jj) < 0 ) THEN |
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| 126 | x_csthick(ji,jj) = ( z_lamda(ji,jj) * pp_v ) / z_fv(ji,jj) |
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| 127 | ELSE |
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| 128 | x_csthick(ji,jj) = 0. |
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| 129 | ENDIF |
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| 130 | ! |
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| 131 | ! Calculate the cool skin correction - only when the heat flux is out of the ocean |
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| 132 | IF( tmask(ji,jj,1) == 1. .AND. x_csthick(ji,jj) /= 0. .AND. psqflux(ji,jj) < 0. ) THEN |
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| 133 | x_csdsst(ji,jj) = ( psqflux(ji,jj) * x_csthick(ji,jj) ) / pp_k |
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| 134 | ELSE |
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| 135 | x_csdsst(ji,jj) = 0. |
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| 136 | ENDIF |
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| 137 | ! |
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| 138 | END_2D |
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[7646] | 139 | ! |
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[5676] | 140 | END SUBROUTINE diurnal_sst_coolskin_step |
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| 141 | |
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[7646] | 142 | !!====================================================================== |
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[10989] | 143 | END MODULE diu_coolskin |
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