[888] | 1 | MODULE sbcfwb |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcfwb *** |
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| 4 | !! Ocean fluxes : domain averaged freshwater budget |
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| 5 | !!====================================================================== |
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| 6 | !! History : 8.2 ! 01-02 (E. Durand) Original code |
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| 7 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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| 8 | !! 9.0 ! 06-08 (G. Madec) Surface module |
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[1553] | 9 | !! 9.2 ! 09-07 (C. Talandier) emp mean s spread over erp area |
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[888] | 10 | !!---------------------------------------------------------------------- |
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| 11 | |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! sbc_fwb : freshwater budget for global ocean configurations |
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| 14 | !! in free surface and forced mode |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | USE oce ! ocean dynamics and tracers |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE sbc_oce ! surface ocean boundary condition |
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| 19 | USE phycst ! physical constants |
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| 20 | USE sbcrnf ! ocean runoffs |
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[1553] | 21 | USE sbcssr ! SS damping terms |
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[888] | 22 | USE daymod ! calendar |
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| 23 | USE in_out_manager ! I/O manager |
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| 24 | USE lib_mpp ! distribued memory computing library |
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[1553] | 25 | USE lbclnk ! ocean lateral boundary conditions |
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[888] | 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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| 29 | |
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| 30 | PUBLIC sbc_fwb ! routine called by step |
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| 31 | |
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| 32 | REAL(wp) :: a_fwb_b ! annual domain averaged freshwater budget |
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| 33 | REAL(wp) :: a_fwb ! for 2 year before (_b) and before year. |
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| 34 | REAL(wp) :: empold ! empold to be suppressed |
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| 35 | REAL(wp) :: area ! global mean ocean surface (interior domain) |
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| 36 | |
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| 37 | REAL(wp), DIMENSION(jpi,jpj) :: e1e2_i ! area of the interior domain (e1t*e2t*tmask_i) |
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| 38 | |
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| 39 | !! * Substitutions |
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| 40 | # include "domzgr_substitute.h90" |
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| 41 | # include "vectopt_loop_substitute.h90" |
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| 42 | !!---------------------------------------------------------------------- |
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| 43 | !! OPA 9.0 , LOCEAN-IPSL (2006) |
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[1156] | 44 | !! $Id$ |
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[888] | 45 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 46 | !!---------------------------------------------------------------------- |
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| 47 | CONTAINS |
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| 48 | |
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| 49 | SUBROUTINE sbc_fwb( kt, kn_fwb, kn_fsbc ) |
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| 50 | !!--------------------------------------------------------------------- |
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| 51 | !! *** ROUTINE sbc_fwb *** |
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| 52 | !! |
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| 53 | !! ** Purpose : Control the mean sea surface drift |
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| 54 | !! |
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| 55 | !! ** Method : several ways depending on kn_fwb |
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| 56 | !! =0 no control |
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[1168] | 57 | !! =1 global mean of emp set to zero at each nn_fsbc time step |
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| 58 | !! =2 annual global mean corrected from previous year |
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[1553] | 59 | !! =3 global mean of emp set to zero at each nn_fsbc time step |
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| 60 | !! & spread out over erp area depending its sign |
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[888] | 61 | !!---------------------------------------------------------------------- |
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| 62 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 63 | INTEGER, INTENT( in ) :: kn_fsbc ! |
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| 64 | INTEGER, INTENT( in ) :: kn_fwb ! ocean time-step index |
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| 65 | !! |
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[895] | 66 | INTEGER :: inum ! temporary logical unit |
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[888] | 67 | INTEGER :: ikty, iyear ! |
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[1553] | 68 | REAL(wp) :: z_emp, z_emp_nsrf ! temporary scalars |
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| 69 | REAL(wp) :: zsurf_neg, zsurf_pos, zsurf_tospread |
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| 70 | REAL(wp), DIMENSION(jpi,jpj) :: ztmsk_neg, ztmsk_pos, ztmsk_tospread |
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| 71 | REAL(wp), DIMENSION(jpi,jpj) :: z_wgt, zerp_cor |
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[888] | 72 | !!---------------------------------------------------------------------- |
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| 73 | ! |
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| 74 | IF( kt == nit000 ) THEN |
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| 75 | ! |
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| 76 | IF(lwp) THEN |
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| 77 | WRITE(numout,*) |
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| 78 | WRITE(numout,*) 'sbc_fwb : FreshWater Budget correction' |
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| 79 | WRITE(numout,*) '~~~~~~~' |
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| 80 | IF( kn_fwb == 1 ) WRITE(numout,*) ' instantaneously set to zero' |
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| 81 | IF( kn_fwb == 2 ) WRITE(numout,*) ' adjusted from previous year budget' |
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[1573] | 82 | IF( kn_fwb == 3 ) WRITE(numout,*) ' emp set to zero and spread out over erp area' |
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| 83 | ! |
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| 84 | IF( kn_fwb == 3 .AND. nn_sssr /= 2 ) & |
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| 85 | & CALL ctl_stop( 'The option nn_fwb = 3 must be associated to nn_sssr = 2 ' ) |
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| 86 | |
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[888] | 87 | ENDIF |
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| 88 | ! |
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| 89 | e1e2_i(:,:) = e1t(:,:) * e2t(:,:) * tmask_i(:,:) |
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| 90 | area = SUM( e1e2_i(:,:) ) |
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| 91 | IF( lk_mpp ) CALL mpp_sum( area ) ! sum over the global domain |
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| 92 | ! |
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| 93 | ENDIF |
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| 94 | |
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| 95 | |
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| 96 | SELECT CASE ( kn_fwb ) |
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| 97 | ! |
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[1245] | 98 | CASE ( 0 ) |
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| 99 | WRITE(ctmp1,*)'sbc_fwb : nn_fwb = ', kn_fwb, ' is not yet associated to an option, choose either 1/2' |
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| 100 | CALL ctl_stop( ctmp1 ) |
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| 101 | ! |
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| 102 | |
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| 103 | ! |
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[888] | 104 | CASE ( 1 ) ! global mean emp set to zero |
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| 105 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
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| 106 | z_emp = SUM( e1e2_i(:,:) * emp(:,:) ) / area |
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| 107 | IF( lk_mpp ) CALL mpp_sum( z_emp ) ! sum over the global domain |
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| 108 | emp (:,:) = emp (:,:) - z_emp |
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| 109 | emps(:,:) = emps(:,:) - z_emp |
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| 110 | ENDIF |
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| 111 | ! |
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| 112 | CASE ( 2 ) ! emp budget adjusted from the previous year |
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| 113 | ! initialisation |
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| 114 | IF( kt == nit000 ) THEN |
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| 115 | ! Read the corrective factor on precipitations (empold) |
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[1581] | 116 | CALL ctl_opn( inum, 'EMPave_old.dat', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, numout, .FALSE. ) |
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[895] | 117 | READ ( inum, "(24X,I8,2ES24.16)" ) iyear, a_fwb_b, a_fwb |
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| 118 | CLOSE( inum ) |
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| 119 | empold = a_fwb ! current year freshwater budget correction |
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| 120 | ! ! estimate from the previous year budget |
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| 121 | IF(lwp)WRITE(numout,*) |
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| 122 | IF(lwp)WRITE(numout,*)'sbc_fwb : year = ',iyear , ' freshwater budget correction = ', empold |
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| 123 | IF(lwp)WRITE(numout,*)' year = ',iyear-1, ' freshwater budget read = ', a_fwb |
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| 124 | IF(lwp)WRITE(numout,*)' year = ',iyear-2, ' freshwater budget read = ', a_fwb_b |
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| 125 | ENDIF |
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[888] | 126 | ! |
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| 127 | ! Update empold if new year start |
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| 128 | ikty = 365 * 86400 / rdttra(1) !!bug use of 365 days leap year or 360d year !!!!!!! |
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| 129 | IF( MOD( kt, ikty ) == 0 ) THEN |
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| 130 | a_fwb_b = a_fwb |
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| 131 | a_fwb = SUM( e1e2_i(:,:) * sshn(:,:) ) |
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| 132 | IF( lk_mpp ) CALL mpp_sum( a_fwb ) ! sum over the global domain |
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| 133 | a_fwb = a_fwb * 1.e+3 / ( area * 86400. * 365. ) ! convert in Kg/m3/s = mm/s |
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| 134 | !!gm ! !!bug 365d year |
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| 135 | empold = a_fwb ! current year freshwater budget correction |
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| 136 | ! ! estimate from the previous year budget |
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| 137 | ENDIF |
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| 138 | ! |
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| 139 | ! correct the freshwater fluxes |
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| 140 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
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[1168] | 141 | emp (:,:) = emp (:,:) + empold |
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| 142 | emps(:,:) = emps(:,:) + empold |
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[888] | 143 | ENDIF |
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| 144 | ! |
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| 145 | ! save empold value in a file |
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[895] | 146 | IF( kt == nitend .AND. lwp ) THEN |
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[1581] | 147 | CALL ctl_opn( inum, 'EMPave.dat', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, numout, .FALSE., narea ) |
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| 148 | WRITE( inum, "(24X,I8,2ES24.16)" ) nyear, a_fwb_b, a_fwb |
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| 149 | CLOSE( inum ) |
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[888] | 150 | ENDIF |
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| 151 | ! |
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[1553] | 152 | CASE ( 3 ) ! global emp set to zero and spread out over erp area |
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| 153 | ! |
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| 154 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
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| 155 | ! Select <0 and >0 area of erp |
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| 156 | ztmsk_pos(:,:) = tmask_i(:,:) |
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| 157 | WHERE( erp < 0.e0 ) ztmsk_pos = 0.e0 |
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| 158 | ztmsk_neg(:,:) = tmask_i(:,:) - ztmsk_pos(:,:) |
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| 159 | |
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| 160 | ! Area filled by <0 and >0 erp |
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| 161 | zsurf_neg = SUM( e1e2_i(:,:)*ztmsk_neg(:,:) ) |
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| 162 | zsurf_pos = SUM( e1e2_i(:,:)*ztmsk_pos(:,:) ) |
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| 163 | |
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| 164 | ! emp global mean |
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| 165 | z_emp = SUM( e1e2_i(:,:) * emp(:,:) ) / area |
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| 166 | ! |
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| 167 | IF( lk_mpp ) CALL mpp_sum( z_emp ) |
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| 168 | |
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| 169 | IF( z_emp < 0.e0 ) THEN |
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| 170 | ! to spread out over >0 erp area to increase evaporation damping process |
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| 171 | zsurf_tospread = zsurf_pos |
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| 172 | ztmsk_tospread(:,:) = ztmsk_pos(:,:) |
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| 173 | ELSE |
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| 174 | ! to spread out over <0 erp area to increase precipitation damping process |
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| 175 | zsurf_tospread = zsurf_neg |
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| 176 | ztmsk_tospread(:,:) = ztmsk_neg(:,:) |
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| 177 | ENDIF |
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| 178 | |
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| 179 | ! emp global mean over <0 or >0 erp area |
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| 180 | z_emp_nsrf = SUM( e1e2_i(:,:) * z_emp ) / ( zsurf_tospread + rsmall ) |
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| 181 | ! weight to respect erp field 2D structure |
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| 182 | z_wgt(:,:) = ztmsk_tospread(:,:) * erp(:,:) / ( SUM( ztmsk_tospread(:,:) * erp(:,:) * e1e2_i(:,:) ) + rsmall ) |
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| 183 | ! final correction term to apply |
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| 184 | zerp_cor(:,:) = -1. * z_emp_nsrf * zsurf_tospread * z_wgt(:,:) |
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| 185 | |
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| 186 | CALL lbc_lnk( zerp_cor, 'T', 1. ) |
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| 187 | |
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| 188 | emp (:,:) = emp (:,:) + zerp_cor(:,:) |
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| 189 | emps(:,:) = emps(:,:) + zerp_cor(:,:) |
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| 190 | erp (:,:) = erp (:,:) + zerp_cor(:,:) |
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| 191 | |
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| 192 | IF( nprint == 1 .AND. lwp ) THEN |
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| 193 | IF( z_emp < 0.e0 ) THEN |
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| 194 | WRITE(numout,*)' z_emp < 0' |
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| 195 | WRITE(numout,*)' SUM(erp+) = ', SUM( ztmsk_tospread(:,:)*erp(:,:)*e1e2_i(:,:) )*1.e-3,' m3.s-1' |
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| 196 | ELSE |
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| 197 | WRITE(numout,*)' z_emp >= 0' |
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| 198 | WRITE(numout,*)' SUM(erp-) = ', SUM( ztmsk_tospread(:,:)*erp(:,:)*e1e2_i(:,:) )*1.e-3,' m3.s-1' |
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| 199 | ENDIF |
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| 200 | WRITE(numout,*)' SUM(empG) = ', SUM( z_emp*e1e2_i(:,:) )*1.e-3,' m3.s-1' |
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| 201 | WRITE(numout,*)' z_emp = ', z_emp ,' mm.s-1' |
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| 202 | WRITE(numout,*)' z_emp_nsrf = ', z_emp_nsrf ,' mm.s-1' |
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| 203 | WRITE(numout,*)' MIN(zerp_cor) = ', MINVAL(zerp_cor) |
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| 204 | WRITE(numout,*)' MAX(zerp_cor) = ', MAXVAL(zerp_cor) |
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| 205 | ENDIF |
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| 206 | ! |
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| 207 | ENDIF |
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| 208 | ! |
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[888] | 209 | CASE DEFAULT ! you should never be there |
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[1245] | 210 | WRITE(ctmp1,*)'sbc_fwb : nn_fwb = ', kn_fwb, ' is not permitted for the FreshWater Budget correction, choose either 1/2' |
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[888] | 211 | CALL ctl_stop( ctmp1 ) |
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| 212 | ! |
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| 213 | END SELECT |
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| 214 | ! |
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| 215 | END SUBROUTINE sbc_fwb |
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| 216 | |
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| 217 | !!====================================================================== |
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| 218 | END MODULE sbcfwb |
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