[1] | 1 | SUBROUTINE calc_liquid_water_content |
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| 2 | |
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[1036] | 3 | !--------------------------------------------------------------------------------! |
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| 4 | ! This file is part of PALM. |
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| 5 | ! |
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| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 8 | ! either version 3 of the License, or (at your option) any later version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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[1310] | 17 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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[1036] | 18 | !--------------------------------------------------------------------------------! |
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| 19 | ! |
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[484] | 20 | ! Current revisions: |
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[1] | 21 | ! ----------------- |
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| 22 | ! |
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[1254] | 23 | ! |
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[1] | 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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[3] | 26 | ! $Id: calc_liquid_water_content.f90 1310 2014-03-14 08:01:56Z heinze $ |
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[39] | 27 | ! |
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[1254] | 28 | ! 1253 2013-11-07 10:48:12Z fricke |
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| 29 | ! Bugfix: q is set to qr in case that q is smaller than qr |
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| 30 | ! |
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[1116] | 31 | ! 1115 2013-03-26 18:16:16Z hoffmann |
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| 32 | ! drizzle can be used independently from precipitation |
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| 33 | ! |
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[1054] | 34 | ! 1053 2012-11-13 17:11:03Z hoffmann |
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| 35 | ! description expanded to the two-moment cloud scheme |
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| 36 | ! |
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[1037] | 37 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 38 | ! code put under GPL (PALM 3.9) |
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| 39 | ! |
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[668] | 40 | ! 667 2010-12-23 12:06:00Z suehring/gyschka |
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| 41 | ! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng |
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| 42 | ! |
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[98] | 43 | ! 95 2007-06-02 16:48:38Z raasch |
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| 44 | ! hydro_press renamed hyp |
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| 45 | ! |
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[39] | 46 | ! 19 2007-02-23 04:53:48Z raasch |
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| 47 | ! Old comment removed |
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| 48 | ! |
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[3] | 49 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 50 | ! |
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[1] | 51 | ! Revision 1.5 2005/03/26 15:22:06 raasch |
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| 52 | ! Arguments for non-cyclic boundary conditions added to argument list of |
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| 53 | ! routine exchange_horiz, |
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| 54 | ! ql calculated for the ghost points, exchange of ghost points removed |
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| 55 | ! |
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| 56 | ! Revision 1.1 2000/04/13 14:50:45 schroeter |
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| 57 | ! Initial revision |
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| 58 | ! |
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| 59 | ! |
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| 60 | ! |
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| 61 | ! Description: |
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| 62 | ! ------------ |
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[1053] | 63 | ! Calculation of the liquid water content (0%-or-100%-scheme). This scheme is |
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| 64 | ! used by the one and the two moment cloud physics scheme. Using the two moment |
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| 65 | ! scheme, this calculation results in the cloud water content. |
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[1] | 66 | !------------------------------------------------------------------------------! |
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| 67 | |
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| 68 | |
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| 69 | USE arrays_3d |
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| 70 | USE cloud_parameters |
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| 71 | USE constants |
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[1115] | 72 | USE control_parameters |
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[1] | 73 | USE grid_variables |
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| 74 | USE indices |
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| 75 | USE pegrid |
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| 76 | |
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| 77 | IMPLICIT NONE |
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| 78 | |
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| 79 | INTEGER :: i, j, k |
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| 80 | |
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| 81 | REAL :: alpha, e_s, q_s, t_l |
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| 82 | |
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[667] | 83 | DO i = nxlg, nxrg |
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| 84 | DO j = nysg, nyng |
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[1115] | 85 | DO k = nzb_s_inner(j,i)+1, nzt |
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[1] | 86 | |
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| 87 | ! |
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| 88 | !-- Compute the liquid water temperature |
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| 89 | t_l = t_d_pt(k) * pt(k,j,i) |
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| 90 | |
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| 91 | ! |
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| 92 | !-- Compute saturation water vapor pressure at t_l |
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| 93 | e_s = 610.78 * EXP( 17.269 * ( t_l - 273.16 ) / & |
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| 94 | ( t_l - 35.86 ) ) |
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| 95 | |
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| 96 | ! |
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| 97 | !-- Compute approximation of saturation humidity |
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[95] | 98 | q_s = 0.622 * e_s / ( hyp(k) - 0.378 * e_s ) |
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[1] | 99 | |
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| 100 | ! |
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| 101 | !-- Correction factor |
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| 102 | alpha = 0.622 * l_d_r * l_d_cp / ( t_l * t_l ) |
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| 103 | |
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| 104 | ! |
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| 105 | !-- Correction of the approximated value |
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| 106 | !-- (see: Cuijpers + Duynkerke, 1993, JAS, 23) |
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| 107 | q_s = q_s * ( 1.0 + alpha * q(k,j,i) ) / ( 1.0 + alpha * q_s ) |
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| 108 | |
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| 109 | ! |
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| 110 | !-- Compute the liquid water content |
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[1115] | 111 | IF ( icloud_scheme == 0 .AND. precipitation) THEN |
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| 112 | IF ( ( q(k,j,i) - q_s - qr(k,j,i) ) > 0.0 ) THEN |
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| 113 | qc(k,j,i) = q(k,j,i) - q_s - qr(k,j,i) |
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| 114 | ql(k,j,i) = qc(k,j,i) + qr(k,j,i) |
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| 115 | ELSE |
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[1253] | 116 | IF ( q(k,j,i) < qr(k,j,i) ) q(k,j,i) = qr(k,j,i) |
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[1115] | 117 | qc(k,j,i) = 0.0 |
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| 118 | ql(k,j,i) = qr(k,j,i) |
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| 119 | ENDIF |
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| 120 | ELSEIF ( icloud_scheme == 0 .AND. .NOT. precipitation ) THEN |
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| 121 | IF ( ( q(k,j,i) - q_s ) > 0.0 ) THEN |
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| 122 | qc(k,j,i) = q(k,j,i) - q_s |
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| 123 | ql(k,j,i) = qc(k,j,i) |
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| 124 | ELSE |
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| 125 | qc(k,j,i) = 0.0 |
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| 126 | ql(k,j,i) = 0.0 |
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| 127 | ENDIF |
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[1] | 128 | ELSE |
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[1115] | 129 | IF ( ( q(k,j,i) - q_s ) > 0.0 ) THEN |
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| 130 | ql(k,j,i) = q(k,j,i) - q_s |
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| 131 | ELSE |
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| 132 | ql(k,j,i) = 0.0 |
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| 133 | ENDIF |
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[1] | 134 | ENDIF |
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| 135 | ENDDO |
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| 136 | ENDDO |
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| 137 | ENDDO |
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| 138 | |
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| 139 | END SUBROUTINE calc_liquid_water_content |
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