[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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| 10 | ! $Log: calc_radiation.f90,v $ |
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| 11 | ! Revision 1.6 2004/01/30 10:17:03 raasch |
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| 12 | ! Scalar lower k index nzb replaced by 2d-array nzb_2d |
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| 13 | ! |
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| 14 | ! Revision 1.5 2003/03/12 16:21:56 raasch |
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| 15 | ! Full code replaced in the call for all gridpoints instead of calling the |
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| 16 | ! _ij version (required by NEC, because otherwise no vectorization) |
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| 17 | ! |
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| 18 | ! Revision 1.4 2002/06/11 12:40:33 raasch |
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| 19 | ! Former subroutine changed to a module which allows to be called for all grid |
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| 20 | ! points of a single vertical column with index i,j or for all grid points by |
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| 21 | ! using function overloading. |
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| 22 | ! 1D-arrays lwp_groud,... are only allocated once in the first call. |
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| 23 | ! |
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| 24 | ! Revision 1.3 2001/03/30 06:55:27 raasch |
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| 25 | ! Translation of remaining German identifiers (variables, subroutines, etc.) |
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| 26 | ! |
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| 27 | ! Revision 1.2 2001/01/22 05:35:05 raasch |
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| 28 | ! Module test_variables removed |
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| 29 | ! |
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| 30 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
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| 31 | ! Initial revision |
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| 32 | ! |
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| 33 | ! |
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| 34 | ! Description: |
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| 35 | ! ------------- |
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| 36 | ! Calculation of the vertical divergences of the long-wave radiation-fluxes |
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| 37 | ! based on the parameterization of the cloud effective emissivity |
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| 38 | !------------------------------------------------------------------------------! |
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| 39 | |
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| 40 | PRIVATE |
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| 41 | PUBLIC calc_radiation |
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| 42 | |
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| 43 | LOGICAL, SAVE :: first_call = .TRUE. |
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| 44 | REAL, SAVE :: sigma = 5.67E-08 |
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| 45 | |
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| 46 | REAL, DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground, lwp_top, & |
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| 47 | blackbody_emission |
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| 48 | |
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| 49 | INTERFACE calc_radiation |
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| 50 | MODULE PROCEDURE calc_radiation |
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| 51 | MODULE PROCEDURE calc_radiation_ij |
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| 52 | END INTERFACE calc_radiation |
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| 53 | |
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| 54 | CONTAINS |
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| 55 | |
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| 56 | |
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| 57 | !------------------------------------------------------------------------------! |
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| 58 | ! Call for all grid points |
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| 59 | !------------------------------------------------------------------------------! |
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| 60 | SUBROUTINE calc_radiation |
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| 61 | |
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| 62 | USE arrays_3d |
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| 63 | USE cloud_parameters |
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| 64 | USE control_parameters |
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| 65 | USE indices |
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| 66 | USE pegrid |
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| 67 | |
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| 68 | IMPLICIT NONE |
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| 69 | |
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| 70 | INTEGER :: i, j, k, k_help |
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| 71 | |
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| 72 | REAL :: df_p, df_m , effective_emission_up_m, effective_emission_up_p, & |
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| 73 | effective_emission_down_m, effective_emission_down_p, & |
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| 74 | f_up_m, f_up_p, f_down_m, f_down_p, impinging_flux_at_top, & |
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| 75 | temperature |
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| 76 | |
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| 77 | |
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| 78 | ! |
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| 79 | !-- On first call, allocate temporary arrays |
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| 80 | IF ( first_call ) THEN |
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| 81 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 82 | lwp_top(nzb:nzt+1) ) |
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| 83 | first_call = .FALSE. |
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| 84 | ENDIF |
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| 85 | |
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| 86 | |
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| 87 | DO i = nxl, nxr |
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| 88 | DO j = nys, nyn |
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| 89 | ! |
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| 90 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 91 | !-- at all vertical levels |
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| 92 | lwp_ground(nzb) = 0.0 |
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| 93 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 94 | |
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| 95 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 96 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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| 97 | |
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| 98 | DO k = nzb_2d(j,i)+1, nzt |
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| 99 | |
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| 100 | k_help = ( nzt+nzb+1 ) - k |
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| 101 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
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| 102 | dzw(k) |
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| 103 | |
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| 104 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 105 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 106 | |
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| 107 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 108 | blackbody_emission(k) = sigma * temperature**4.0 |
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| 109 | |
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| 110 | ENDDO |
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| 111 | |
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| 112 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 113 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 114 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 115 | |
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| 116 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 117 | ql(nzt+1,j,i) |
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| 118 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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| 119 | |
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| 120 | ! |
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| 121 | !-- See Chlond '92, this is just a first guess |
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| 122 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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| 123 | |
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| 124 | DO k = nzb_2d(j,i)+1, nzt |
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| 125 | ! |
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| 126 | !-- Save some computational time, but this may cause load |
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| 127 | !-- imbalances if ql is not distributed uniformly |
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| 128 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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| 129 | ! |
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| 130 | !-- Compute effective emissivities |
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| 131 | effective_emission_up_p = 1.0 - & |
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| 132 | EXP( -130.0 * lwp_ground(k+1) ) |
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| 133 | effective_emission_up_m = 1.0 - & |
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| 134 | EXP( -130.0 * lwp_ground(k-1) ) |
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| 135 | effective_emission_down_p = 1.0 - & |
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| 136 | EXP( -158.0 * lwp_top(k+1) ) |
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| 137 | effective_emission_down_m = 1.0 - & |
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| 138 | EXP( -158.0 * lwp_top(k-1) ) |
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| 139 | |
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| 140 | ! |
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| 141 | !-- Compute vertical long wave radiation fluxes |
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| 142 | f_up_p = blackbody_emission(nzb) + & |
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| 143 | effective_emission_up_p * & |
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| 144 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 145 | |
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| 146 | f_up_m = blackbody_emission(nzb) + & |
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| 147 | effective_emission_up_m * & |
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| 148 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 149 | |
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| 150 | f_down_p = impinging_flux_at_top + & |
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| 151 | effective_emission_down_p * & |
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| 152 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 153 | |
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| 154 | f_down_m = impinging_flux_at_top + & |
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| 155 | effective_emission_down_m * & |
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| 156 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 157 | |
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| 158 | ! |
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| 159 | !-- Divergence of vertical long wave radiation fluxes |
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| 160 | df_p = f_up_p - f_down_p |
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| 161 | df_m = f_up_m - f_down_m |
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| 162 | |
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| 163 | ! |
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| 164 | !-- Compute tendency term |
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| 165 | tend(k,j,i) = tend(k,j,i) - & |
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| 166 | ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 167 | ( df_p - df_m ) / dzw(k) ) |
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| 168 | |
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| 169 | ENDIF |
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| 170 | |
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| 171 | ENDDO |
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| 172 | ENDDO |
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| 173 | ENDDO |
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| 174 | |
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| 175 | END SUBROUTINE calc_radiation |
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| 176 | |
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| 177 | |
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| 178 | !------------------------------------------------------------------------------! |
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| 179 | ! Call for grid point i,j |
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| 180 | !------------------------------------------------------------------------------! |
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| 181 | SUBROUTINE calc_radiation_ij( i, j ) |
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| 182 | |
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| 183 | USE arrays_3d |
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| 184 | USE cloud_parameters |
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| 185 | USE control_parameters |
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| 186 | USE indices |
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| 187 | USE pegrid |
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| 188 | |
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| 189 | IMPLICIT NONE |
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| 190 | |
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| 191 | INTEGER :: i, j, k, k_help |
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| 192 | |
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| 193 | REAL :: df_p, df_m , effective_emission_up_m, effective_emission_up_p, & |
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| 194 | effective_emission_down_m, effective_emission_down_p, & |
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| 195 | f_up_m, f_up_p, f_down_m, f_down_p, impinging_flux_at_top, & |
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| 196 | temperature |
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| 197 | |
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| 198 | ! |
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| 199 | !-- On first call, allocate temporary arrays |
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| 200 | IF ( first_call ) THEN |
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| 201 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 202 | lwp_top(nzb:nzt+1) ) |
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| 203 | first_call = .FALSE. |
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| 204 | ENDIF |
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| 205 | |
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| 206 | ! |
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| 207 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 208 | !-- at all vertical levels |
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| 209 | lwp_ground(nzb) = 0.0 |
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| 210 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 211 | |
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| 212 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 213 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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| 214 | |
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| 215 | DO k = nzb_2d(j,i)+1, nzt |
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| 216 | k_help = ( nzt+nzb+1 ) - k |
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| 217 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
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| 218 | |
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| 219 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 220 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 221 | |
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| 222 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 223 | blackbody_emission(k) = sigma * temperature**4.0 |
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| 224 | |
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| 225 | ENDDO |
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| 226 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 227 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 228 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 229 | |
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| 230 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 231 | ql(nzt+1,j,i) |
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| 232 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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| 233 | |
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| 234 | ! |
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| 235 | !-- See Chlond '92, this is just a first guess |
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| 236 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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| 237 | |
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| 238 | DO k = nzb_2d(j,i)+1, nzt |
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| 239 | ! |
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| 240 | !-- Store some computational time, |
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| 241 | !-- this may cause load imbalances if ql is not distributed uniformly |
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| 242 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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| 243 | ! |
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| 244 | !-- Compute effective emissivities |
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| 245 | effective_emission_up_p = 1.0 - & |
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| 246 | EXP( -130.0 * lwp_ground(k+1) ) |
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| 247 | effective_emission_up_m = 1.0 - & |
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| 248 | EXP( -130.0 * lwp_ground(k-1) ) |
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| 249 | effective_emission_down_p = 1.0 - & |
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| 250 | EXP( -158.0 * lwp_top(k+1) ) |
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| 251 | effective_emission_down_m = 1.0 - & |
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| 252 | EXP( -158.0 * lwp_top(k-1) ) |
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| 253 | |
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| 254 | ! |
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| 255 | !-- Compute vertical long wave radiation fluxes |
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| 256 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
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| 257 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 258 | |
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| 259 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
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| 260 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 261 | |
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| 262 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
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| 263 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 264 | |
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| 265 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
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| 266 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 267 | |
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| 268 | ! |
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| 269 | !- Divergence of vertical long wave radiation fluxes |
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| 270 | df_p = f_up_p - f_down_p |
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| 271 | df_m = f_up_m - f_down_m |
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| 272 | |
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| 273 | ! |
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| 274 | !-- Compute tendency term |
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| 275 | tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 276 | ( df_p - df_m ) / dzw(k) ) |
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| 277 | |
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| 278 | ENDIF |
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| 279 | |
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| 280 | ENDDO |
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| 281 | |
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| 282 | END SUBROUTINE calc_radiation_ij |
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| 283 | |
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| 284 | END MODULE calc_radiation_mod |
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