[1] | 1 | MODULE calc_radiation_mod |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! Actual revisions: |
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| 5 | ! ----------------- |
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| 6 | ! |
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| 7 | ! |
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| 8 | ! Former revisions: |
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| 9 | ! ----------------- |
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[3] | 10 | ! $Id: calc_radiation.f90 4 2007-02-13 11:33:16Z raasch $ |
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| 11 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 12 | ! |
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[1] | 13 | ! Revision 1.6 2004/01/30 10:17:03 raasch |
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| 14 | ! Scalar lower k index nzb replaced by 2d-array nzb_2d |
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| 15 | ! |
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| 16 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
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| 17 | ! Initial revision |
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| 18 | ! |
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| 19 | ! |
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| 20 | ! Description: |
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| 21 | ! ------------- |
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| 22 | ! Calculation of the vertical divergences of the long-wave radiation-fluxes |
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| 23 | ! based on the parameterization of the cloud effective emissivity |
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| 24 | !------------------------------------------------------------------------------! |
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| 25 | |
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| 26 | PRIVATE |
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| 27 | PUBLIC calc_radiation |
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| 28 | |
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| 29 | LOGICAL, SAVE :: first_call = .TRUE. |
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| 30 | REAL, SAVE :: sigma = 5.67E-08 |
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| 31 | |
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| 32 | REAL, DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground, lwp_top, & |
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| 33 | blackbody_emission |
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| 34 | |
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| 35 | INTERFACE calc_radiation |
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| 36 | MODULE PROCEDURE calc_radiation |
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| 37 | MODULE PROCEDURE calc_radiation_ij |
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| 38 | END INTERFACE calc_radiation |
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| 39 | |
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| 40 | CONTAINS |
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| 41 | |
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| 42 | |
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| 43 | !------------------------------------------------------------------------------! |
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| 44 | ! Call for all grid points |
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| 45 | !------------------------------------------------------------------------------! |
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| 46 | SUBROUTINE calc_radiation |
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| 47 | |
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| 48 | USE arrays_3d |
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| 49 | USE cloud_parameters |
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| 50 | USE control_parameters |
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| 51 | USE indices |
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| 52 | USE pegrid |
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| 53 | |
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| 54 | IMPLICIT NONE |
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| 55 | |
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| 56 | INTEGER :: i, j, k, k_help |
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| 57 | |
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| 58 | REAL :: df_p, df_m , effective_emission_up_m, effective_emission_up_p, & |
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| 59 | effective_emission_down_m, effective_emission_down_p, & |
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| 60 | f_up_m, f_up_p, f_down_m, f_down_p, impinging_flux_at_top, & |
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| 61 | temperature |
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| 62 | |
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| 63 | |
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| 64 | ! |
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| 65 | !-- On first call, allocate temporary arrays |
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| 66 | IF ( first_call ) THEN |
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| 67 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 68 | lwp_top(nzb:nzt+1) ) |
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| 69 | first_call = .FALSE. |
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| 70 | ENDIF |
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| 71 | |
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| 72 | |
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| 73 | DO i = nxl, nxr |
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| 74 | DO j = nys, nyn |
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| 75 | ! |
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| 76 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 77 | !-- at all vertical levels |
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| 78 | lwp_ground(nzb) = 0.0 |
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| 79 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 80 | |
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| 81 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 82 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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| 83 | |
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| 84 | DO k = nzb_2d(j,i)+1, nzt |
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| 85 | |
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| 86 | k_help = ( nzt+nzb+1 ) - k |
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| 87 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
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| 88 | dzw(k) |
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| 89 | |
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| 90 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 91 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 92 | |
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| 93 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 94 | blackbody_emission(k) = sigma * temperature**4.0 |
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| 95 | |
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| 96 | ENDDO |
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| 97 | |
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| 98 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 99 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 100 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 101 | |
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| 102 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 103 | ql(nzt+1,j,i) |
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| 104 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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| 105 | |
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| 106 | ! |
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| 107 | !-- See Chlond '92, this is just a first guess |
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| 108 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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| 109 | |
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| 110 | DO k = nzb_2d(j,i)+1, nzt |
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| 111 | ! |
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| 112 | !-- Save some computational time, but this may cause load |
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| 113 | !-- imbalances if ql is not distributed uniformly |
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| 114 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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| 115 | ! |
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| 116 | !-- Compute effective emissivities |
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| 117 | effective_emission_up_p = 1.0 - & |
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| 118 | EXP( -130.0 * lwp_ground(k+1) ) |
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| 119 | effective_emission_up_m = 1.0 - & |
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| 120 | EXP( -130.0 * lwp_ground(k-1) ) |
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| 121 | effective_emission_down_p = 1.0 - & |
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| 122 | EXP( -158.0 * lwp_top(k+1) ) |
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| 123 | effective_emission_down_m = 1.0 - & |
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| 124 | EXP( -158.0 * lwp_top(k-1) ) |
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| 125 | |
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| 126 | ! |
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| 127 | !-- Compute vertical long wave radiation fluxes |
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| 128 | f_up_p = blackbody_emission(nzb) + & |
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| 129 | effective_emission_up_p * & |
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| 130 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 131 | |
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| 132 | f_up_m = blackbody_emission(nzb) + & |
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| 133 | effective_emission_up_m * & |
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| 134 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 135 | |
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| 136 | f_down_p = impinging_flux_at_top + & |
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| 137 | effective_emission_down_p * & |
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| 138 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 139 | |
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| 140 | f_down_m = impinging_flux_at_top + & |
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| 141 | effective_emission_down_m * & |
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| 142 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 143 | |
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| 144 | ! |
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| 145 | !-- Divergence of vertical long wave radiation fluxes |
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| 146 | df_p = f_up_p - f_down_p |
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| 147 | df_m = f_up_m - f_down_m |
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| 148 | |
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| 149 | ! |
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| 150 | !-- Compute tendency term |
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| 151 | tend(k,j,i) = tend(k,j,i) - & |
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| 152 | ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 153 | ( df_p - df_m ) / dzw(k) ) |
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| 154 | |
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| 155 | ENDIF |
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| 156 | |
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| 157 | ENDDO |
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| 158 | ENDDO |
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| 159 | ENDDO |
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| 160 | |
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| 161 | END SUBROUTINE calc_radiation |
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| 162 | |
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| 163 | |
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| 164 | !------------------------------------------------------------------------------! |
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| 165 | ! Call for grid point i,j |
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| 166 | !------------------------------------------------------------------------------! |
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| 167 | SUBROUTINE calc_radiation_ij( i, j ) |
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| 168 | |
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| 169 | USE arrays_3d |
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| 170 | USE cloud_parameters |
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| 171 | USE control_parameters |
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| 172 | USE indices |
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| 173 | USE pegrid |
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| 174 | |
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| 175 | IMPLICIT NONE |
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| 176 | |
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| 177 | INTEGER :: i, j, k, k_help |
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| 178 | |
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| 179 | REAL :: df_p, df_m , effective_emission_up_m, effective_emission_up_p, & |
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| 180 | effective_emission_down_m, effective_emission_down_p, & |
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| 181 | f_up_m, f_up_p, f_down_m, f_down_p, impinging_flux_at_top, & |
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| 182 | temperature |
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| 183 | |
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| 184 | ! |
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| 185 | !-- On first call, allocate temporary arrays |
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| 186 | IF ( first_call ) THEN |
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| 187 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 188 | lwp_top(nzb:nzt+1) ) |
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| 189 | first_call = .FALSE. |
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| 190 | ENDIF |
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| 191 | |
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| 192 | ! |
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| 193 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 194 | !-- at all vertical levels |
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| 195 | lwp_ground(nzb) = 0.0 |
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| 196 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 197 | |
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| 198 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 199 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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| 200 | |
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| 201 | DO k = nzb_2d(j,i)+1, nzt |
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| 202 | k_help = ( nzt+nzb+1 ) - k |
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| 203 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
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| 204 | |
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| 205 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 206 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 207 | |
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| 208 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 209 | blackbody_emission(k) = sigma * temperature**4.0 |
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| 210 | |
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| 211 | ENDDO |
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| 212 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 213 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 214 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 215 | |
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| 216 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 217 | ql(nzt+1,j,i) |
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| 218 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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| 219 | |
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| 220 | ! |
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| 221 | !-- See Chlond '92, this is just a first guess |
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| 222 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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| 223 | |
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| 224 | DO k = nzb_2d(j,i)+1, nzt |
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| 225 | ! |
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| 226 | !-- Store some computational time, |
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| 227 | !-- this may cause load imbalances if ql is not distributed uniformly |
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| 228 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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| 229 | ! |
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| 230 | !-- Compute effective emissivities |
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| 231 | effective_emission_up_p = 1.0 - & |
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| 232 | EXP( -130.0 * lwp_ground(k+1) ) |
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| 233 | effective_emission_up_m = 1.0 - & |
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| 234 | EXP( -130.0 * lwp_ground(k-1) ) |
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| 235 | effective_emission_down_p = 1.0 - & |
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| 236 | EXP( -158.0 * lwp_top(k+1) ) |
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| 237 | effective_emission_down_m = 1.0 - & |
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| 238 | EXP( -158.0 * lwp_top(k-1) ) |
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| 239 | |
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| 240 | ! |
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| 241 | !-- Compute vertical long wave radiation fluxes |
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| 242 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
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| 243 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 244 | |
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| 245 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
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| 246 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 247 | |
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| 248 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
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| 249 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 250 | |
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| 251 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
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| 252 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 253 | |
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| 254 | ! |
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| 255 | !- Divergence of vertical long wave radiation fluxes |
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| 256 | df_p = f_up_p - f_down_p |
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| 257 | df_m = f_up_m - f_down_m |
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| 258 | |
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| 259 | ! |
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| 260 | !-- Compute tendency term |
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| 261 | tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 262 | ( df_p - df_m ) / dzw(k) ) |
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| 263 | |
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| 264 | ENDIF |
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| 265 | |
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| 266 | ENDDO |
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| 267 | |
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| 268 | END SUBROUTINE calc_radiation_ij |
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| 269 | |
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| 270 | END MODULE calc_radiation_mod |
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