| 1 | MODULE asminc |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE asminc *** |
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| 4 | !! Assimilation increment : Apply an increment generated by data |
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| 5 | !! assimilation |
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| 6 | !!====================================================================== |
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| 7 | !! History : ! 2007-03 (M. Martin) Met Office version |
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| 8 | !! ! 2007-04 (A. Weaver) calc_date original code |
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| 9 | !! ! 2007-04 (A. Weaver) Merge with OPAVAR/NEMOVAR |
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| 10 | !! NEMO 3.3 ! 2010-05 (D. Lea) Update to work with NEMO v3.2 |
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| 11 | !! - ! 2010-05 (D. Lea) add calc_month_len routine based on day_init |
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| 12 | !! 3.4 ! 2012-10 (A. Weaver and K. Mogensen) Fix for direct initialization |
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| 13 | !! ! 2014-09 (D. Lea) Local calc_date removed use routine from OBS |
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| 14 | !! ! 2015-11 (D. Lea) Handle non-zero initial time of day |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | !! asm_inc_init : Initialize the increment arrays and IAU weights |
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| 19 | !! tra_asm_inc : Apply the tracer (T and S) increments |
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| 20 | !! dyn_asm_inc : Apply the dynamic (u and v) increments |
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| 21 | !! ssh_asm_inc : Apply the SSH increment |
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| 22 | !! seaice_asm_inc : Apply the seaice increment |
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| 23 | !!---------------------------------------------------------------------- |
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| 24 | USE par_oce ! Ocean space and time domain variables |
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| 25 | USE dom_oce ! Ocean space and time domain |
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| 26 | USE domvvl ! domain: variable volume level |
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| 27 | USE oce ! Dynamics and active tracers defined in memory |
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| 28 | USE ldfdyn ! lateral diffusion: eddy viscosity coefficients |
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| 29 | USE eosbn2 ! Equation of state - in situ and potential density |
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| 30 | USE zpshde ! Partial step : Horizontal Derivative |
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| 31 | USE iom ! Library to read input files |
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| 32 | USE asmpar ! Parameters for the assmilation interface |
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| 33 | USE c1d ! 1D initialization |
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| 34 | USE in_out_manager ! I/O manager |
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| 35 | USE lib_mpp ! MPP library |
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| 36 | #if defined key_lim2 |
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| 37 | USE ice_2 ! LIM2 |
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| 38 | #endif |
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| 39 | USE sbc_oce ! Surface boundary condition variables. |
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| 40 | USE diaobs, ONLY: calc_date ! Compute the calendar date on a given step |
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| 41 | |
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| 42 | IMPLICIT NONE |
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| 43 | PRIVATE |
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| 44 | |
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| 45 | PUBLIC asm_inc_init !: Initialize the increment arrays and IAU weights |
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| 46 | PUBLIC tra_asm_inc !: Apply the tracer (T and S) increments |
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| 47 | PUBLIC dyn_asm_inc !: Apply the dynamic (u and v) increments |
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| 48 | PUBLIC ssh_asm_inc !: Apply the SSH increment |
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| 49 | PUBLIC seaice_asm_inc !: Apply the seaice increment |
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| 50 | |
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| 51 | #if defined key_asminc |
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| 52 | LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .TRUE. !: Logical switch for assimilation increment interface |
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| 53 | #else |
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| 54 | LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .FALSE. !: No assimilation increments |
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| 55 | #endif |
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| 56 | LOGICAL, PUBLIC :: ln_bkgwri !: No output of the background state fields |
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| 57 | LOGICAL, PUBLIC :: ln_asmiau !: No applying forcing with an assimilation increment |
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| 58 | LOGICAL, PUBLIC :: ln_asmdin !: No direct initialization |
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| 59 | LOGICAL, PUBLIC :: ln_trainc !: No tracer (T and S) assimilation increments |
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| 60 | LOGICAL, PUBLIC :: ln_dyninc !: No dynamics (u and v) assimilation increments |
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| 61 | LOGICAL, PUBLIC :: ln_sshinc !: No sea surface height assimilation increment |
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| 62 | LOGICAL, PUBLIC :: ln_seaiceinc !: No sea ice concentration increment |
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| 63 | LOGICAL, PUBLIC :: ln_salfix !: Apply minimum salinity check |
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| 64 | LOGICAL, PUBLIC :: ln_temnofreeze = .FALSE. !: Don't allow the temperature to drop below freezing |
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| 65 | INTEGER, PUBLIC :: nn_divdmp !: Apply divergence damping filter nn_divdmp times |
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| 66 | |
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| 67 | REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkg , s_bkg !: Background temperature and salinity |
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| 68 | REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkg , v_bkg !: Background u- & v- velocity components |
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| 69 | REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkginc, s_bkginc !: Increment to the background T & S |
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| 70 | REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkginc, v_bkginc !: Increment to the u- & v-components |
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| 71 | REAL(wp), PUBLIC, DIMENSION(:) , ALLOCATABLE :: wgtiau !: IAU weights for each time step |
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| 72 | #if defined key_asminc |
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| 73 | REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: ssh_iau !: IAU-weighted sea surface height increment |
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| 74 | #endif |
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| 75 | ! !!! time steps relative to the cycle interval [0,nitend-nit000-1] |
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| 76 | INTEGER , PUBLIC :: nitbkg !: Time step of the background state used in the Jb term |
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| 77 | INTEGER , PUBLIC :: nitdin !: Time step of the background state for direct initialization |
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| 78 | INTEGER , PUBLIC :: nitiaustr !: Time step of the start of the IAU interval |
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| 79 | INTEGER , PUBLIC :: nitiaufin !: Time step of the end of the IAU interval |
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| 80 | ! |
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| 81 | INTEGER , PUBLIC :: niaufn !: Type of IAU weighing function: = 0 Constant weighting |
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| 82 | ! !: = 1 Linear hat-like, centred in middle of IAU interval |
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| 83 | REAL(wp), PUBLIC :: salfixmin !: Ensure that the salinity is larger than this value if (ln_salfix) |
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| 84 | |
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| 85 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ssh_bkg, ssh_bkginc ! Background sea surface height and its increment |
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| 86 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: seaice_bkginc ! Increment to the background sea ice conc |
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| 87 | |
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| 88 | !! * Substitutions |
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| 89 | # include "vectopt_loop_substitute.h90" |
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| 90 | !!---------------------------------------------------------------------- |
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| 91 | !! NEMO/OPA 3.7 , NEMO Consortium (2015) |
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| 92 | !! $Id$ |
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| 93 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 94 | !!---------------------------------------------------------------------- |
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| 95 | CONTAINS |
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| 96 | |
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| 97 | SUBROUTINE asm_inc_init |
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| 98 | !!---------------------------------------------------------------------- |
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| 99 | !! *** ROUTINE asm_inc_init *** |
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| 100 | !! |
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| 101 | !! ** Purpose : Initialize the assimilation increment and IAU weights. |
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| 102 | !! |
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| 103 | !! ** Method : Initialize the assimilation increment and IAU weights. |
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| 104 | !! |
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| 105 | !! ** Action : |
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| 106 | !!---------------------------------------------------------------------- |
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| 107 | INTEGER :: ji, jj, jk, jt ! dummy loop indices |
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| 108 | INTEGER :: imid, inum ! local integers |
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| 109 | INTEGER :: ios ! Local integer output status for namelist read |
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| 110 | INTEGER :: iiauper ! Number of time steps in the IAU period |
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| 111 | INTEGER :: icycper ! Number of time steps in the cycle |
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| 112 | REAL(KIND=dp) :: ditend_date ! Date YYYYMMDD.HHMMSS of final time step |
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| 113 | REAL(KIND=dp) :: ditbkg_date ! Date YYYYMMDD.HHMMSS of background time step for Jb term |
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| 114 | REAL(KIND=dp) :: ditdin_date ! Date YYYYMMDD.HHMMSS of background time step for DI |
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| 115 | REAL(KIND=dp) :: ditiaustr_date ! Date YYYYMMDD.HHMMSS of IAU interval start time step |
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| 116 | REAL(KIND=dp) :: ditiaufin_date ! Date YYYYMMDD.HHMMSS of IAU interval final time step |
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| 117 | |
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| 118 | REAL(wp) :: znorm ! Normalization factor for IAU weights |
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| 119 | REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one) |
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| 120 | REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid |
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| 121 | REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid |
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| 122 | REAL(wp) :: zdate_bkg ! Date in background state file for DI |
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| 123 | REAL(wp) :: zdate_inc ! Time axis in increments file |
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| 124 | ! |
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| 125 | REAL(wp), DIMENSION(jpi,jpj) :: hdiv ! 2D workspace |
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| 126 | !! |
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| 127 | NAMELIST/nam_asminc/ ln_bkgwri, & |
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| 128 | & ln_trainc, ln_dyninc, ln_sshinc, & |
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| 129 | & ln_asmdin, ln_asmiau, & |
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| 130 | & nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, & |
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| 131 | & ln_salfix, salfixmin, nn_divdmp |
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| 132 | !!---------------------------------------------------------------------- |
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| 133 | |
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| 134 | !----------------------------------------------------------------------- |
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| 135 | ! Read Namelist nam_asminc : assimilation increment interface |
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| 136 | !----------------------------------------------------------------------- |
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| 137 | ln_seaiceinc = .FALSE. |
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| 138 | ln_temnofreeze = .FALSE. |
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| 139 | |
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| 140 | REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment |
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| 141 | READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901) |
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| 142 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp ) |
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| 143 | |
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| 144 | REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment |
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| 145 | READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 ) |
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| 146 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp ) |
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| 147 | IF(lwm) WRITE ( numond, nam_asminc ) |
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| 148 | |
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| 149 | ! Control print |
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| 150 | IF(lwp) THEN |
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| 151 | WRITE(numout,*) |
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| 152 | WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :' |
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| 153 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 154 | WRITE(numout,*) ' Namelist namasm : set assimilation increment parameters' |
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| 155 | WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri |
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| 156 | WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc |
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| 157 | WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc |
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| 158 | WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc |
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| 159 | WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin |
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| 160 | WRITE(numout,*) ' Logical switch for applying sea ice increments ln_seaiceinc = ', ln_seaiceinc |
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| 161 | WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau |
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| 162 | WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg |
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| 163 | WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin |
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| 164 | WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr |
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| 165 | WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin |
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| 166 | WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn |
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| 167 | WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix |
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| 168 | WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin |
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| 169 | ENDIF |
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| 170 | |
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| 171 | nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000 |
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| 172 | nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000 |
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| 173 | nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000 |
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| 174 | nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000 |
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| 175 | |
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| 176 | iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length |
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| 177 | icycper = nitend - nit000 + 1 ! Cycle interval length |
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| 178 | |
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| 179 | ! Date of final time step |
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| 180 | CALL calc_date( nitend, ditend_date ) |
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| 181 | |
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| 182 | ! Background time for Jb referenced to ndate0 |
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| 183 | CALL calc_date( nitbkg_r, ditbkg_date ) |
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| 184 | |
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| 185 | ! Background time for DI referenced to ndate0 |
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| 186 | CALL calc_date( nitdin_r, ditdin_date ) |
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| 187 | |
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| 188 | ! IAU start time referenced to ndate0 |
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| 189 | CALL calc_date( nitiaustr_r, ditiaustr_date ) |
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| 190 | |
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| 191 | ! IAU end time referenced to ndate0 |
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| 192 | CALL calc_date( nitiaufin_r, ditiaufin_date ) |
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| 193 | |
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| 194 | IF(lwp) THEN |
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| 195 | WRITE(numout,*) |
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| 196 | WRITE(numout,*) ' Time steps referenced to current cycle:' |
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| 197 | WRITE(numout,*) ' iitrst = ', nit000 - 1 |
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| 198 | WRITE(numout,*) ' nit000 = ', nit000 |
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| 199 | WRITE(numout,*) ' nitend = ', nitend |
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| 200 | WRITE(numout,*) ' nitbkg_r = ', nitbkg_r |
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| 201 | WRITE(numout,*) ' nitdin_r = ', nitdin_r |
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| 202 | WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r |
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| 203 | WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r |
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| 204 | WRITE(numout,*) |
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| 205 | WRITE(numout,*) ' Dates referenced to current cycle:' |
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| 206 | WRITE(numout,*) ' ndastp = ', ndastp |
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| 207 | WRITE(numout,*) ' ndate0 = ', ndate0 |
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| 208 | WRITE(numout,*) ' nn_time0 = ', nn_time0 |
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| 209 | WRITE(numout,*) ' ditend_date = ', ditend_date |
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| 210 | WRITE(numout,*) ' ditbkg_date = ', ditbkg_date |
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| 211 | WRITE(numout,*) ' ditdin_date = ', ditdin_date |
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| 212 | WRITE(numout,*) ' ditiaustr_date = ', ditiaustr_date |
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| 213 | WRITE(numout,*) ' ditiaufin_date = ', ditiaufin_date |
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| 214 | ENDIF |
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| 215 | |
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| 216 | |
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| 217 | IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) & |
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| 218 | & CALL ctl_stop( ' ln_asmdin and ln_asmiau :', & |
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| 219 | & ' Choose Direct Initialization OR Incremental Analysis Updating') |
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| 220 | |
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| 221 | IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) & |
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| 222 | .AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ) .OR. ( ln_seaiceinc) )) & |
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| 223 | & CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc is set to .true.', & |
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| 224 | & ' but ln_asmdin and ln_asmiau are both set to .false. :', & |
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| 225 | & ' Inconsistent options') |
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| 226 | |
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| 227 | IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) & |
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| 228 | & CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', & |
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| 229 | & ' Type IAU weighting function is invalid') |
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| 230 | |
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| 231 | IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) & |
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| 232 | & ) & |
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| 233 | & CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc are set to .false. :', & |
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| 234 | & ' The assimilation increments are not applied') |
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| 235 | |
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| 236 | IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) & |
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| 237 | & CALL ctl_stop( ' nitiaustr = nitiaufin :', & |
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| 238 | & ' IAU interval is of zero length') |
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| 239 | |
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| 240 | IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) & |
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| 241 | & CALL ctl_stop( ' nitiaustr or nitiaufin :', & |
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| 242 | & ' IAU starting or final time step is outside the cycle interval', & |
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| 243 | & ' Valid range nit000 to nitend') |
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| 244 | |
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| 245 | IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) & |
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| 246 | & CALL ctl_stop( ' nitbkg :', & |
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| 247 | & ' Background time step is outside the cycle interval') |
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| 248 | |
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| 249 | IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) & |
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| 250 | & CALL ctl_stop( ' nitdin :', & |
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| 251 | & ' Background time step for Direct Initialization is outside', & |
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| 252 | & ' the cycle interval') |
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| 253 | |
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| 254 | IF ( nstop > 0 ) RETURN ! if there are any errors then go no further |
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| 255 | |
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| 256 | !-------------------------------------------------------------------- |
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| 257 | ! Initialize the Incremental Analysis Updating weighting function |
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| 258 | !-------------------------------------------------------------------- |
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| 259 | |
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| 260 | IF ( ln_asmiau ) THEN |
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| 261 | |
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| 262 | ALLOCATE( wgtiau( icycper ) ) |
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| 263 | |
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| 264 | wgtiau(:) = 0.0 |
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| 265 | |
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| 266 | IF ( niaufn == 0 ) THEN |
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| 267 | |
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| 268 | !--------------------------------------------------------- |
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| 269 | ! Constant IAU forcing |
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| 270 | !--------------------------------------------------------- |
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| 271 | |
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| 272 | DO jt = 1, iiauper |
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| 273 | wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper ) |
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| 274 | END DO |
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| 275 | |
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| 276 | ELSEIF ( niaufn == 1 ) THEN |
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| 277 | |
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| 278 | !--------------------------------------------------------- |
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| 279 | ! Linear hat-like, centred in middle of IAU interval |
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| 280 | !--------------------------------------------------------- |
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| 281 | |
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| 282 | ! Compute the normalization factor |
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| 283 | znorm = 0.0 |
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| 284 | IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval |
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| 285 | imid = iiauper / 2 |
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| 286 | DO jt = 1, imid |
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| 287 | znorm = znorm + REAL( jt ) |
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| 288 | END DO |
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| 289 | znorm = 2.0 * znorm |
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| 290 | ELSE ! Odd number of time steps in IAU interval |
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| 291 | imid = ( iiauper + 1 ) / 2 |
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| 292 | DO jt = 1, imid - 1 |
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| 293 | znorm = znorm + REAL( jt ) |
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| 294 | END DO |
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| 295 | znorm = 2.0 * znorm + REAL( imid ) |
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| 296 | ENDIF |
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| 297 | znorm = 1.0 / znorm |
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| 298 | |
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| 299 | DO jt = 1, imid - 1 |
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| 300 | wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm |
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| 301 | END DO |
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| 302 | DO jt = imid, iiauper |
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| 303 | wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm |
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| 304 | END DO |
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| 305 | |
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| 306 | ENDIF |
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| 307 | |
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| 308 | ! Test that the integral of the weights over the weighting interval equals 1 |
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| 309 | IF(lwp) THEN |
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| 310 | WRITE(numout,*) |
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| 311 | WRITE(numout,*) 'asm_inc_init : IAU weights' |
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| 312 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 313 | WRITE(numout,*) ' time step IAU weight' |
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| 314 | WRITE(numout,*) ' ========= =====================' |
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| 315 | ztotwgt = 0.0 |
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| 316 | DO jt = 1, icycper |
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| 317 | ztotwgt = ztotwgt + wgtiau(jt) |
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| 318 | WRITE(numout,*) ' ', jt, ' ', wgtiau(jt) |
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| 319 | END DO |
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| 320 | WRITE(numout,*) ' ===================================' |
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| 321 | WRITE(numout,*) ' Time-integrated weight = ', ztotwgt |
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| 322 | WRITE(numout,*) ' ===================================' |
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| 323 | ENDIF |
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| 324 | |
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| 325 | ENDIF |
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| 326 | |
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| 327 | !-------------------------------------------------------------------- |
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| 328 | ! Allocate and initialize the increment arrays |
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| 329 | !-------------------------------------------------------------------- |
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| 330 | |
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| 331 | ALLOCATE( t_bkginc(jpi,jpj,jpk) ) |
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| 332 | ALLOCATE( s_bkginc(jpi,jpj,jpk) ) |
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| 333 | ALLOCATE( u_bkginc(jpi,jpj,jpk) ) |
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| 334 | ALLOCATE( v_bkginc(jpi,jpj,jpk) ) |
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| 335 | ALLOCATE( ssh_bkginc(jpi,jpj) ) |
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| 336 | ALLOCATE( seaice_bkginc(jpi,jpj)) |
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| 337 | #if defined key_asminc |
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| 338 | ALLOCATE( ssh_iau(jpi,jpj) ) |
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| 339 | #endif |
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| 340 | t_bkginc(:,:,:) = 0.0 |
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| 341 | s_bkginc(:,:,:) = 0.0 |
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| 342 | u_bkginc(:,:,:) = 0.0 |
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| 343 | v_bkginc(:,:,:) = 0.0 |
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| 344 | ssh_bkginc(:,:) = 0.0 |
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| 345 | seaice_bkginc(:,:) = 0.0 |
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| 346 | #if defined key_asminc |
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| 347 | ssh_iau(:,:) = 0.0 |
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| 348 | #endif |
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| 349 | IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) ) THEN |
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| 350 | |
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| 351 | !-------------------------------------------------------------------- |
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| 352 | ! Read the increments from file |
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| 353 | !-------------------------------------------------------------------- |
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| 354 | |
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| 355 | CALL iom_open( c_asminc, inum ) |
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| 356 | |
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| 357 | CALL iom_get( inum, 'time', zdate_inc ) |
|---|
| 358 | |
|---|
| 359 | CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb ) |
|---|
| 360 | CALL iom_get( inum, 'z_inc_datef', z_inc_datef ) |
|---|
| 361 | z_inc_dateb = zdate_inc |
|---|
| 362 | z_inc_datef = zdate_inc |
|---|
| 363 | |
|---|
| 364 | IF(lwp) THEN |
|---|
| 365 | WRITE(numout,*) |
|---|
| 366 | WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', & |
|---|
| 367 | & ' between dates ', z_inc_dateb,' and ', & |
|---|
| 368 | & z_inc_datef |
|---|
| 369 | WRITE(numout,*) '~~~~~~~~~~~~' |
|---|
| 370 | ENDIF |
|---|
| 371 | |
|---|
| 372 | IF ( ( z_inc_dateb < ndastp + nn_time0*0.0001_wp ) & |
|---|
| 373 | & .OR.( z_inc_datef > ditend_date ) ) & |
|---|
| 374 | & CALL ctl_warn( ' Validity time of assimilation increments is ', & |
|---|
| 375 | & ' outside the assimilation interval' ) |
|---|
| 376 | |
|---|
| 377 | IF ( ( ln_asmdin ).AND.( zdate_inc /= ditdin_date ) ) & |
|---|
| 378 | & CALL ctl_warn( ' Validity time of assimilation increments does ', & |
|---|
| 379 | & ' not agree with Direct Initialization time' ) |
|---|
| 380 | |
|---|
| 381 | IF ( ln_trainc ) THEN |
|---|
| 382 | CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 ) |
|---|
| 383 | CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 ) |
|---|
| 384 | ! Apply the masks |
|---|
| 385 | t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:) |
|---|
| 386 | s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:) |
|---|
| 387 | ! Set missing increments to 0.0 rather than 1e+20 |
|---|
| 388 | ! to allow for differences in masks |
|---|
| 389 | WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0 |
|---|
| 390 | WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0 |
|---|
| 391 | ENDIF |
|---|
| 392 | |
|---|
| 393 | IF ( ln_dyninc ) THEN |
|---|
| 394 | CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 ) |
|---|
| 395 | CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 ) |
|---|
| 396 | ! Apply the masks |
|---|
| 397 | u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:) |
|---|
| 398 | v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:) |
|---|
| 399 | ! Set missing increments to 0.0 rather than 1e+20 |
|---|
| 400 | ! to allow for differences in masks |
|---|
| 401 | WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0 |
|---|
| 402 | WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0 |
|---|
| 403 | ENDIF |
|---|
| 404 | |
|---|
| 405 | IF ( ln_sshinc ) THEN |
|---|
| 406 | CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 ) |
|---|
| 407 | ! Apply the masks |
|---|
| 408 | ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1) |
|---|
| 409 | ! Set missing increments to 0.0 rather than 1e+20 |
|---|
| 410 | ! to allow for differences in masks |
|---|
| 411 | WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0 |
|---|
| 412 | ENDIF |
|---|
| 413 | |
|---|
| 414 | IF ( ln_seaiceinc ) THEN |
|---|
| 415 | CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 ) |
|---|
| 416 | ! Apply the masks |
|---|
| 417 | seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1) |
|---|
| 418 | ! Set missing increments to 0.0 rather than 1e+20 |
|---|
| 419 | ! to allow for differences in masks |
|---|
| 420 | WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0 |
|---|
| 421 | ENDIF |
|---|
| 422 | |
|---|
| 423 | CALL iom_close( inum ) |
|---|
| 424 | |
|---|
| 425 | ENDIF |
|---|
| 426 | |
|---|
| 427 | !----------------------------------------------------------------------- |
|---|
| 428 | ! Apply divergence damping filter |
|---|
| 429 | !----------------------------------------------------------------------- |
|---|
| 430 | |
|---|
| 431 | IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN |
|---|
| 432 | ! |
|---|
| 433 | ! |
|---|
| 434 | DO jt = 1, nn_divdmp |
|---|
| 435 | ! |
|---|
| 436 | DO jk = 1, jpkm1 ! hdiv = e1e1 * div |
|---|
| 437 | hdiv(:,:) = 0._wp |
|---|
| 438 | DO jj = 2, jpjm1 |
|---|
| 439 | DO ji = fs_2, fs_jpim1 ! vector opt. |
|---|
| 440 | hdiv(ji,jj) = ( e2u(ji ,jj) * e3u_n(ji ,jj,jk) * u_bkginc(ji ,jj,jk) & |
|---|
| 441 | & - e2u(ji-1,jj) * e3u_n(ji-1,jj,jk) * u_bkginc(ji-1,jj,jk) & |
|---|
| 442 | & + e1v(ji,jj ) * e3v_n(ji,jj ,jk) * v_bkginc(ji,jj ,jk) & |
|---|
| 443 | & - e1v(ji,jj-1) * e3v_n(ji,jj-1,jk) * v_bkginc(ji,jj-1,jk) ) / e3t_n(ji,jj,jk) |
|---|
| 444 | END DO |
|---|
| 445 | END DO |
|---|
| 446 | CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change) |
|---|
| 447 | ! |
|---|
| 448 | DO jj = 2, jpjm1 |
|---|
| 449 | DO ji = fs_2, fs_jpim1 ! vector opt. |
|---|
| 450 | u_bkginc(ji,jj,jk) = u_bkginc(ji,jj,jk) & |
|---|
| 451 | & + 0.2_wp * ( hdiv(ji+1,jj) - hdiv(ji ,jj) ) * r1_e1u(ji,jj) * umask(ji,jj,jk) |
|---|
| 452 | v_bkginc(ji,jj,jk) = v_bkginc(ji,jj,jk) & |
|---|
| 453 | & + 0.2_wp * ( hdiv(ji,jj+1) - hdiv(ji,jj ) ) * r1_e2v(ji,jj) * vmask(ji,jj,jk) |
|---|
| 454 | END DO |
|---|
| 455 | END DO |
|---|
| 456 | END DO |
|---|
| 457 | ! |
|---|
| 458 | END DO |
|---|
| 459 | ! |
|---|
| 460 | ! |
|---|
| 461 | ENDIF |
|---|
| 462 | |
|---|
| 463 | !----------------------------------------------------------------------- |
|---|
| 464 | ! Allocate and initialize the background state arrays |
|---|
| 465 | !----------------------------------------------------------------------- |
|---|
| 466 | |
|---|
| 467 | IF ( ln_asmdin ) THEN |
|---|
| 468 | ! |
|---|
| 469 | ALLOCATE( t_bkg(jpi,jpj,jpk) ) |
|---|
| 470 | ALLOCATE( s_bkg(jpi,jpj,jpk) ) |
|---|
| 471 | ALLOCATE( u_bkg(jpi,jpj,jpk) ) |
|---|
| 472 | ALLOCATE( v_bkg(jpi,jpj,jpk) ) |
|---|
| 473 | ALLOCATE( ssh_bkg(jpi,jpj) ) |
|---|
| 474 | ! |
|---|
| 475 | t_bkg(:,:,:) = 0._wp |
|---|
| 476 | s_bkg(:,:,:) = 0._wp |
|---|
| 477 | u_bkg(:,:,:) = 0._wp |
|---|
| 478 | v_bkg(:,:,:) = 0._wp |
|---|
| 479 | ssh_bkg(:,:) = 0._wp |
|---|
| 480 | ! |
|---|
| 481 | !-------------------------------------------------------------------- |
|---|
| 482 | ! Read from file the background state at analysis time |
|---|
| 483 | !-------------------------------------------------------------------- |
|---|
| 484 | ! |
|---|
| 485 | CALL iom_open( c_asmdin, inum ) |
|---|
| 486 | ! |
|---|
| 487 | CALL iom_get( inum, 'rdastp', zdate_bkg ) |
|---|
| 488 | ! |
|---|
| 489 | IF(lwp) THEN |
|---|
| 490 | WRITE(numout,*) |
|---|
| 491 | WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', & |
|---|
| 492 | & zdate_bkg |
|---|
| 493 | WRITE(numout,*) '~~~~~~~~~~~~' |
|---|
| 494 | ENDIF |
|---|
| 495 | ! |
|---|
| 496 | IF ( zdate_bkg /= ditdin_date ) & |
|---|
| 497 | & CALL ctl_warn( ' Validity time of assimilation background state does', & |
|---|
| 498 | & ' not agree with Direct Initialization time' ) |
|---|
| 499 | ! |
|---|
| 500 | IF ( ln_trainc ) THEN |
|---|
| 501 | CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg ) |
|---|
| 502 | CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg ) |
|---|
| 503 | t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:) |
|---|
| 504 | s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:) |
|---|
| 505 | ENDIF |
|---|
| 506 | ! |
|---|
| 507 | IF ( ln_dyninc ) THEN |
|---|
| 508 | CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg ) |
|---|
| 509 | CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg ) |
|---|
| 510 | u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:) |
|---|
| 511 | v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:) |
|---|
| 512 | ENDIF |
|---|
| 513 | ! |
|---|
| 514 | IF ( ln_sshinc ) THEN |
|---|
| 515 | CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg ) |
|---|
| 516 | ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1) |
|---|
| 517 | ENDIF |
|---|
| 518 | ! |
|---|
| 519 | CALL iom_close( inum ) |
|---|
| 520 | ! |
|---|
| 521 | ENDIF |
|---|
| 522 | ! |
|---|
| 523 | END SUBROUTINE asm_inc_init |
|---|
| 524 | SUBROUTINE tra_asm_inc( kt ) |
|---|
| 525 | !!---------------------------------------------------------------------- |
|---|
| 526 | !! *** ROUTINE tra_asm_inc *** |
|---|
| 527 | !! |
|---|
| 528 | !! ** Purpose : Apply the tracer (T and S) assimilation increments |
|---|
| 529 | !! |
|---|
| 530 | !! ** Method : Direct initialization or Incremental Analysis Updating |
|---|
| 531 | !! |
|---|
| 532 | !! ** Action : |
|---|
| 533 | !!---------------------------------------------------------------------- |
|---|
| 534 | INTEGER, INTENT(IN) :: kt ! Current time step |
|---|
| 535 | ! |
|---|
| 536 | INTEGER :: ji, jj, jk |
|---|
| 537 | INTEGER :: it |
|---|
| 538 | REAL(wp) :: zincwgt ! IAU weight for current time step |
|---|
| 539 | REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values |
|---|
| 540 | !!---------------------------------------------------------------------- |
|---|
| 541 | ! |
|---|
| 542 | ! freezing point calculation taken from oc_fz_pt (but calculated for all depths) |
|---|
| 543 | ! used to prevent the applied increments taking the temperature below the local freezing point |
|---|
| 544 | DO jk = 1, jpkm1 |
|---|
| 545 | CALL eos_fzp( tsn(:,:,jk,jp_sal), fzptnz(:,:,jk), gdept_n(:,:,jk) ) |
|---|
| 546 | END DO |
|---|
| 547 | ! |
|---|
| 548 | ! !-------------------------------------- |
|---|
| 549 | IF ( ln_asmiau ) THEN ! Incremental Analysis Updating |
|---|
| 550 | ! !-------------------------------------- |
|---|
| 551 | ! |
|---|
| 552 | IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN |
|---|
| 553 | ! |
|---|
| 554 | it = kt - nit000 + 1 |
|---|
| 555 | zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step |
|---|
| 556 | ! |
|---|
| 557 | IF(lwp) THEN |
|---|
| 558 | WRITE(numout,*) |
|---|
| 559 | WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it) |
|---|
| 560 | WRITE(numout,*) '~~~~~~~~~~~~' |
|---|
| 561 | ENDIF |
|---|
| 562 | ! |
|---|
| 563 | ! Update the tracer tendencies |
|---|
| 564 | DO jk = 1, jpkm1 |
|---|
| 565 | IF (ln_temnofreeze) THEN |
|---|
| 566 | ! Do not apply negative increments if the temperature will fall below freezing |
|---|
| 567 | WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. & |
|---|
| 568 | & tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) ) |
|---|
| 569 | tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt |
|---|
| 570 | END WHERE |
|---|
| 571 | ELSE |
|---|
| 572 | tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt |
|---|
| 573 | ENDIF |
|---|
| 574 | IF (ln_salfix) THEN |
|---|
| 575 | ! Do not apply negative increments if the salinity will fall below a specified |
|---|
| 576 | ! minimum value salfixmin |
|---|
| 577 | WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. & |
|---|
| 578 | & tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin ) |
|---|
| 579 | tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt |
|---|
| 580 | END WHERE |
|---|
| 581 | ELSE |
|---|
| 582 | tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt |
|---|
| 583 | ENDIF |
|---|
| 584 | END DO |
|---|
| 585 | ! |
|---|
| 586 | ENDIF |
|---|
| 587 | ! |
|---|
| 588 | IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work |
|---|
| 589 | DEALLOCATE( t_bkginc ) |
|---|
| 590 | DEALLOCATE( s_bkginc ) |
|---|
| 591 | ENDIF |
|---|
| 592 | ! !-------------------------------------- |
|---|
| 593 | ELSEIF ( ln_asmdin ) THEN ! Direct Initialization |
|---|
| 594 | ! !-------------------------------------- |
|---|
| 595 | ! |
|---|
| 596 | IF ( kt == nitdin_r ) THEN |
|---|
| 597 | ! |
|---|
| 598 | neuler = 0 ! Force Euler forward step |
|---|
| 599 | ! |
|---|
| 600 | ! Initialize the now fields with the background + increment |
|---|
| 601 | IF (ln_temnofreeze) THEN |
|---|
| 602 | ! Do not apply negative increments if the temperature will fall below freezing |
|---|
| 603 | WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) ) |
|---|
| 604 | tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:) |
|---|
| 605 | END WHERE |
|---|
| 606 | ELSE |
|---|
| 607 | tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:) |
|---|
| 608 | ENDIF |
|---|
| 609 | IF (ln_salfix) THEN |
|---|
| 610 | ! Do not apply negative increments if the salinity will fall below a specified |
|---|
| 611 | ! minimum value salfixmin |
|---|
| 612 | WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin ) |
|---|
| 613 | tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:) |
|---|
| 614 | END WHERE |
|---|
| 615 | ELSE |
|---|
| 616 | tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:) |
|---|
| 617 | ENDIF |
|---|
| 618 | |
|---|
| 619 | tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields |
|---|
| 620 | |
|---|
| 621 | CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities |
|---|
| 622 | !!gm fabien |
|---|
| 623 | ! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities |
|---|
| 624 | !!gm |
|---|
| 625 | |
|---|
| 626 | IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) & |
|---|
| 627 | & CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient |
|---|
| 628 | & rhd, gru , grv ) ! of t, s, rd at the last ocean level |
|---|
| 629 | IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) & |
|---|
| 630 | & CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF) |
|---|
| 631 | & rhd, gru , grv , grui, grvi ) ! of t, s, rd at the last ocean level |
|---|
| 632 | |
|---|
| 633 | DEALLOCATE( t_bkginc ) |
|---|
| 634 | DEALLOCATE( s_bkginc ) |
|---|
| 635 | DEALLOCATE( t_bkg ) |
|---|
| 636 | DEALLOCATE( s_bkg ) |
|---|
| 637 | ENDIF |
|---|
| 638 | ! |
|---|
| 639 | ENDIF |
|---|
| 640 | ! Perhaps the following call should be in step |
|---|
| 641 | IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment |
|---|
| 642 | ! |
|---|
| 643 | END SUBROUTINE tra_asm_inc |
|---|
| 644 | |
|---|
| 645 | |
|---|
| 646 | SUBROUTINE dyn_asm_inc( kt ) |
|---|
| 647 | !!---------------------------------------------------------------------- |
|---|
| 648 | !! *** ROUTINE dyn_asm_inc *** |
|---|
| 649 | !! |
|---|
| 650 | !! ** Purpose : Apply the dynamics (u and v) assimilation increments. |
|---|
| 651 | !! |
|---|
| 652 | !! ** Method : Direct initialization or Incremental Analysis Updating. |
|---|
| 653 | !! |
|---|
| 654 | !! ** Action : |
|---|
| 655 | !!---------------------------------------------------------------------- |
|---|
| 656 | INTEGER, INTENT(IN) :: kt ! Current time step |
|---|
| 657 | ! |
|---|
| 658 | INTEGER :: jk |
|---|
| 659 | INTEGER :: it |
|---|
| 660 | REAL(wp) :: zincwgt ! IAU weight for current time step |
|---|
| 661 | !!---------------------------------------------------------------------- |
|---|
| 662 | ! |
|---|
| 663 | ! !-------------------------------------------- |
|---|
| 664 | IF ( ln_asmiau ) THEN ! Incremental Analysis Updating |
|---|
| 665 | ! !-------------------------------------------- |
|---|
| 666 | ! |
|---|
| 667 | IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN |
|---|
| 668 | ! |
|---|
| 669 | it = kt - nit000 + 1 |
|---|
| 670 | zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step |
|---|
| 671 | ! |
|---|
| 672 | IF(lwp) THEN |
|---|
| 673 | WRITE(numout,*) |
|---|
| 674 | WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', kt,' with IAU weight = ', wgtiau(it) |
|---|
| 675 | WRITE(numout,*) '~~~~~~~~~~~~' |
|---|
| 676 | ENDIF |
|---|
| 677 | ! |
|---|
| 678 | ! Update the dynamic tendencies |
|---|
| 679 | DO jk = 1, jpkm1 |
|---|
| 680 | ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt |
|---|
| 681 | va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt |
|---|
| 682 | END DO |
|---|
| 683 | ! |
|---|
| 684 | IF ( kt == nitiaufin_r ) THEN |
|---|
| 685 | DEALLOCATE( u_bkginc ) |
|---|
| 686 | DEALLOCATE( v_bkginc ) |
|---|
| 687 | ENDIF |
|---|
| 688 | ! |
|---|
| 689 | ENDIF |
|---|
| 690 | ! !----------------------------------------- |
|---|
| 691 | ELSEIF ( ln_asmdin ) THEN ! Direct Initialization |
|---|
| 692 | ! !----------------------------------------- |
|---|
| 693 | ! |
|---|
| 694 | IF ( kt == nitdin_r ) THEN |
|---|
| 695 | ! |
|---|
| 696 | neuler = 0 ! Force Euler forward step |
|---|
| 697 | ! |
|---|
| 698 | ! Initialize the now fields with the background + increment |
|---|
| 699 | un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:) |
|---|
| 700 | vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:) |
|---|
| 701 | ! |
|---|
| 702 | ub(:,:,:) = un(:,:,:) ! Update before fields |
|---|
| 703 | vb(:,:,:) = vn(:,:,:) |
|---|
| 704 | ! |
|---|
| 705 | DEALLOCATE( u_bkg ) |
|---|
| 706 | DEALLOCATE( v_bkg ) |
|---|
| 707 | DEALLOCATE( u_bkginc ) |
|---|
| 708 | DEALLOCATE( v_bkginc ) |
|---|
| 709 | ENDIF |
|---|
| 710 | ! |
|---|
| 711 | ENDIF |
|---|
| 712 | ! |
|---|
| 713 | END SUBROUTINE dyn_asm_inc |
|---|
| 714 | |
|---|
| 715 | |
|---|
| 716 | SUBROUTINE ssh_asm_inc( kt ) |
|---|
| 717 | !!---------------------------------------------------------------------- |
|---|
| 718 | !! *** ROUTINE ssh_asm_inc *** |
|---|
| 719 | !! |
|---|
| 720 | !! ** Purpose : Apply the sea surface height assimilation increment. |
|---|
| 721 | !! |
|---|
| 722 | !! ** Method : Direct initialization or Incremental Analysis Updating. |
|---|
| 723 | !! |
|---|
| 724 | !! ** Action : |
|---|
| 725 | !!---------------------------------------------------------------------- |
|---|
| 726 | INTEGER, INTENT(IN) :: kt ! Current time step |
|---|
| 727 | ! |
|---|
| 728 | INTEGER :: it |
|---|
| 729 | INTEGER :: jk |
|---|
| 730 | REAL(wp) :: zincwgt ! IAU weight for current time step |
|---|
| 731 | !!---------------------------------------------------------------------- |
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| 732 | ! |
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| 733 | ! !----------------------------------------- |
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| 734 | IF ( ln_asmiau ) THEN ! Incremental Analysis Updating |
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| 735 | ! !----------------------------------------- |
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| 736 | ! |
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| 737 | IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN |
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| 738 | ! |
|---|
| 739 | it = kt - nit000 + 1 |
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| 740 | zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step |
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| 741 | ! |
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| 742 | IF(lwp) THEN |
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| 743 | WRITE(numout,*) |
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| 744 | WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', & |
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| 745 | & kt,' with IAU weight = ', wgtiau(it) |
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| 746 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 747 | ENDIF |
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| 748 | ! |
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| 749 | ! Save the tendency associated with the IAU weighted SSH increment |
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| 750 | ! (applied in dynspg.*) |
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| 751 | #if defined key_asminc |
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| 752 | ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt |
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| 753 | #endif |
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| 754 | IF ( kt == nitiaufin_r ) THEN |
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| 755 | DEALLOCATE( ssh_bkginc ) |
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| 756 | ENDIF |
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| 757 | ! |
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| 758 | ENDIF |
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| 759 | ! !----------------------------------------- |
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| 760 | ELSEIF ( ln_asmdin ) THEN ! Direct Initialization |
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| 761 | ! !----------------------------------------- |
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| 762 | ! |
|---|
| 763 | IF ( kt == nitdin_r ) THEN |
|---|
| 764 | ! |
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| 765 | neuler = 0 ! Force Euler forward step |
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| 766 | ! |
|---|
| 767 | sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:) ! Initialize the now fields the background + increment |
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| 768 | ! |
|---|
| 769 | sshb(:,:) = sshn(:,:) ! Update before fields |
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| 770 | e3t_b(:,:,:) = e3t_n(:,:,:) |
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| 771 | !!gm why not e3u_b, e3v_b, gdept_b ???? |
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| 772 | ! |
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| 773 | DEALLOCATE( ssh_bkg ) |
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| 774 | DEALLOCATE( ssh_bkginc ) |
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| 775 | ! |
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| 776 | ENDIF |
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| 777 | ! |
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| 778 | ENDIF |
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| 779 | ! |
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| 780 | END SUBROUTINE ssh_asm_inc |
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| 781 | |
|---|
| 782 | |
|---|
| 783 | SUBROUTINE seaice_asm_inc( kt, kindic ) |
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| 784 | !!---------------------------------------------------------------------- |
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| 785 | !! *** ROUTINE seaice_asm_inc *** |
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| 786 | !! |
|---|
| 787 | !! ** Purpose : Apply the sea ice assimilation increment. |
|---|
| 788 | !! |
|---|
| 789 | !! ** Method : Direct initialization or Incremental Analysis Updating. |
|---|
| 790 | !! |
|---|
| 791 | !! ** Action : |
|---|
| 792 | !! |
|---|
| 793 | !!---------------------------------------------------------------------- |
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| 794 | INTEGER, INTENT(in) :: kt ! Current time step |
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| 795 | INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation |
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| 796 | ! |
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| 797 | INTEGER :: it |
|---|
| 798 | REAL(wp) :: zincwgt ! IAU weight for current time step |
|---|
| 799 | #if defined key_lim2 |
|---|
| 800 | REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM |
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| 801 | REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres |
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| 802 | #endif |
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| 803 | !!---------------------------------------------------------------------- |
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| 804 | ! |
|---|
| 805 | ! !----------------------------------------- |
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| 806 | IF ( ln_asmiau ) THEN ! Incremental Analysis Updating |
|---|
| 807 | ! !----------------------------------------- |
|---|
| 808 | ! |
|---|
| 809 | IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN |
|---|
| 810 | ! |
|---|
| 811 | it = kt - nit000 + 1 |
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| 812 | zincwgt = wgtiau(it) ! IAU weight for the current time step |
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| 813 | ! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments) |
|---|
| 814 | ! |
|---|
| 815 | IF(lwp) THEN |
|---|
| 816 | WRITE(numout,*) |
|---|
| 817 | WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', kt,' with IAU weight = ', wgtiau(it) |
|---|
| 818 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 819 | ENDIF |
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| 820 | ! |
|---|
| 821 | ! Sea-ice : LIM-3 case (to add) |
|---|
| 822 | ! |
|---|
| 823 | #if defined key_lim2 |
|---|
| 824 | ! Sea-ice : LIM-2 case |
|---|
| 825 | zofrld (:,:) = frld(:,:) |
|---|
| 826 | zohicif(:,:) = hicif(:,:) |
|---|
| 827 | ! |
|---|
| 828 | frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp) |
|---|
| 829 | pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp) |
|---|
| 830 | fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction |
|---|
| 831 | ! |
|---|
| 832 | zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied |
|---|
| 833 | ! |
|---|
| 834 | ! Nudge sea ice depth to bring it up to a required minimum depth |
|---|
| 835 | WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin ) |
|---|
| 836 | zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt |
|---|
| 837 | ELSEWHERE |
|---|
| 838 | zhicifinc(:,:) = 0.0_wp |
|---|
| 839 | END WHERE |
|---|
| 840 | ! |
|---|
| 841 | ! nudge ice depth |
|---|
| 842 | hicif (:,:) = hicif (:,:) + zhicifinc(:,:) |
|---|
| 843 | phicif(:,:) = phicif(:,:) + zhicifinc(:,:) |
|---|
| 844 | ! |
|---|
| 845 | ! seaice salinity balancing (to add) |
|---|
| 846 | #endif |
|---|
| 847 | |
|---|
| 848 | #if defined key_cice && defined key_asminc |
|---|
| 849 | ! Sea-ice : CICE case. Pass ice increment tendency into CICE |
|---|
| 850 | ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt |
|---|
| 851 | #endif |
|---|
| 852 | |
|---|
| 853 | IF ( kt == nitiaufin_r ) THEN |
|---|
| 854 | DEALLOCATE( seaice_bkginc ) |
|---|
| 855 | ENDIF |
|---|
| 856 | |
|---|
| 857 | ELSE |
|---|
| 858 | |
|---|
| 859 | #if defined key_cice && defined key_asminc |
|---|
| 860 | ndaice_da(:,:) = 0._wp ! Sea-ice : CICE case. Zero ice increment tendency into CICE |
|---|
| 861 | #endif |
|---|
| 862 | |
|---|
| 863 | ENDIF |
|---|
| 864 | ! !----------------------------------------- |
|---|
| 865 | ELSEIF ( ln_asmdin ) THEN ! Direct Initialization |
|---|
| 866 | ! !----------------------------------------- |
|---|
| 867 | ! |
|---|
| 868 | IF ( kt == nitdin_r ) THEN |
|---|
| 869 | ! |
|---|
| 870 | neuler = 0 ! Force Euler forward step |
|---|
| 871 | ! |
|---|
| 872 | ! Sea-ice : LIM-3 case (to add) |
|---|
| 873 | ! |
|---|
| 874 | #if defined key_lim2 |
|---|
| 875 | ! Sea-ice : LIM-2 case. |
|---|
| 876 | zofrld(:,:)=frld(:,:) |
|---|
| 877 | zohicif(:,:)=hicif(:,:) |
|---|
| 878 | ! |
|---|
| 879 | ! Initialize the now fields the background + increment |
|---|
| 880 | frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp) |
|---|
| 881 | pfrld(:,:) = frld(:,:) |
|---|
| 882 | fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction |
|---|
| 883 | zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied |
|---|
| 884 | ! |
|---|
| 885 | ! Nudge sea ice depth to bring it up to a required minimum depth |
|---|
| 886 | WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin ) |
|---|
| 887 | zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt |
|---|
| 888 | ELSEWHERE |
|---|
| 889 | zhicifinc(:,:) = 0._wp |
|---|
| 890 | END WHERE |
|---|
| 891 | ! |
|---|
| 892 | ! nudge ice depth |
|---|
| 893 | hicif (:,:) = hicif (:,:) + zhicifinc(:,:) |
|---|
| 894 | phicif(:,:) = phicif(:,:) |
|---|
| 895 | ! |
|---|
| 896 | ! seaice salinity balancing (to add) |
|---|
| 897 | #endif |
|---|
| 898 | ! |
|---|
| 899 | #if defined key_cice && defined key_asminc |
|---|
| 900 | ! Sea-ice : CICE case. Pass ice increment tendency into CICE |
|---|
| 901 | ndaice_da(:,:) = seaice_bkginc(:,:) / rdt |
|---|
| 902 | #endif |
|---|
| 903 | IF ( .NOT. PRESENT(kindic) ) THEN |
|---|
| 904 | DEALLOCATE( seaice_bkginc ) |
|---|
| 905 | END IF |
|---|
| 906 | ! |
|---|
| 907 | ELSE |
|---|
| 908 | ! |
|---|
| 909 | #if defined key_cice && defined key_asminc |
|---|
| 910 | ndaice_da(:,:) = 0._wp ! Sea-ice : CICE case. Zero ice increment tendency into CICE |
|---|
| 911 | |
|---|
| 912 | #endif |
|---|
| 913 | ! |
|---|
| 914 | ENDIF |
|---|
| 915 | |
|---|
| 916 | !#if defined defined key_lim2 || defined key_cice |
|---|
| 917 | ! |
|---|
| 918 | ! IF (ln_seaicebal ) THEN |
|---|
| 919 | ! !! balancing salinity increments |
|---|
| 920 | ! !! simple case from limflx.F90 (doesn't include a mass flux) |
|---|
| 921 | ! !! assumption is that as ice concentration is reduced or increased |
|---|
| 922 | ! !! the snow and ice depths remain constant |
|---|
| 923 | ! !! note that snow is being created where ice concentration is being increased |
|---|
| 924 | ! !! - could be more sophisticated and |
|---|
| 925 | ! !! not do this (but would need to alter h_snow) |
|---|
| 926 | ! |
|---|
| 927 | ! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store |
|---|
| 928 | ! |
|---|
| 929 | ! DO jj = 1, jpj |
|---|
| 930 | ! DO ji = 1, jpi |
|---|
| 931 | ! ! calculate change in ice and snow mass per unit area |
|---|
| 932 | ! ! positive values imply adding salt to the ocean (results from ice formation) |
|---|
| 933 | ! ! fwf : ice formation and melting |
|---|
| 934 | ! |
|---|
| 935 | ! zfons = ( -nfresh_da(ji,jj)*soce + nfsalt_da(ji,jj) )*rdt |
|---|
| 936 | ! |
|---|
| 937 | ! ! change salinity down to mixed layer depth |
|---|
| 938 | ! mld=hmld_kara(ji,jj) |
|---|
| 939 | ! |
|---|
| 940 | ! ! prevent small mld |
|---|
| 941 | ! ! less than 10m can cause salinity instability |
|---|
| 942 | ! IF (mld < 10) mld=10 |
|---|
| 943 | ! |
|---|
| 944 | ! ! set to bottom of a level |
|---|
| 945 | ! DO jk = jpk-1, 2, -1 |
|---|
| 946 | ! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN |
|---|
| 947 | ! mld=gdepw(ji,jj,jk+1) |
|---|
| 948 | ! jkmax=jk |
|---|
| 949 | ! ENDIF |
|---|
| 950 | ! ENDDO |
|---|
| 951 | ! |
|---|
| 952 | ! ! avoid applying salinity balancing in shallow water or on land |
|---|
| 953 | ! ! |
|---|
| 954 | ! |
|---|
| 955 | ! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m) |
|---|
| 956 | ! |
|---|
| 957 | ! dsal_ocn=0.0_wp |
|---|
| 958 | ! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing |
|---|
| 959 | ! |
|---|
| 960 | ! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) & |
|---|
| 961 | ! dsal_ocn = zfons / (rhop(ji,jj,1) * mld) |
|---|
| 962 | ! |
|---|
| 963 | ! ! put increments in for levels in the mixed layer |
|---|
| 964 | ! ! but prevent salinity below a threshold value |
|---|
| 965 | ! |
|---|
| 966 | ! DO jk = 1, jkmax |
|---|
| 967 | ! |
|---|
| 968 | ! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN |
|---|
| 969 | ! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn |
|---|
| 970 | ! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn |
|---|
| 971 | ! ENDIF |
|---|
| 972 | ! |
|---|
| 973 | ! ENDDO |
|---|
| 974 | ! |
|---|
| 975 | ! ! ! salt exchanges at the ice/ocean interface |
|---|
| 976 | ! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep |
|---|
| 977 | ! ! |
|---|
| 978 | ! !! Adjust fsalt. A +ve fsalt means adding salt to ocean |
|---|
| 979 | ! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt |
|---|
| 980 | ! !! |
|---|
| 981 | ! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d) |
|---|
| 982 | ! !! ! E-P (kg m-2 s-2) |
|---|
| 983 | ! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2) |
|---|
| 984 | ! ENDDO !ji |
|---|
| 985 | ! ENDDO !jj! |
|---|
| 986 | ! |
|---|
| 987 | ! ENDIF !ln_seaicebal |
|---|
| 988 | ! |
|---|
| 989 | !#endif |
|---|
| 990 | ! |
|---|
| 991 | ENDIF |
|---|
| 992 | ! |
|---|
| 993 | END SUBROUTINE seaice_asm_inc |
|---|
| 994 | |
|---|
| 995 | !!====================================================================== |
|---|
| 996 | END MODULE asminc |
|---|
