[1682] | 1 | !> @file calc_liquid_water_content.f90 |
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[2000] | 2 | !------------------------------------------------------------------------------! |
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[1036] | 3 | ! This file is part of PALM. |
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| 4 | ! |
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[2000] | 5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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| 6 | ! terms of the GNU General Public License as published by the Free Software |
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| 7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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| 8 | ! version. |
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[1036] | 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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[1818] | 17 | ! Copyright 1997-2016 Leibniz Universitaet Hannover |
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[2000] | 18 | !------------------------------------------------------------------------------! |
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[1036] | 19 | ! |
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[484] | 20 | ! Current revisions: |
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[1] | 21 | ! ----------------- |
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[1354] | 22 | ! |
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[2001] | 23 | ! |
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[1321] | 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: calc_liquid_water_content.f90 2001 2016-08-20 18:41:22Z gronemeier $ |
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| 27 | ! |
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[2001] | 28 | ! 2000 2016-08-20 18:09:15Z knoop |
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| 29 | ! Forced header and separation lines into 80 columns |
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| 30 | ! |
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[1823] | 31 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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| 32 | ! icloud_scheme removed. microphysics_seifert added. |
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| 33 | ! |
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[1683] | 34 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 35 | ! Code annotations made doxygen readable |
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| 36 | ! |
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[1354] | 37 | ! 1353 2014-04-08 15:21:23Z heinze |
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| 38 | ! REAL constants provided with KIND-attribute |
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| 39 | ! |
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[1321] | 40 | ! 1320 2014-03-20 08:40:49Z raasch |
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[1320] | 41 | ! ONLY-attribute added to USE-statements, |
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| 42 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 43 | ! kinds are defined in new module kinds, |
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| 44 | ! revision history before 2012 removed, |
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| 45 | ! comment fields (!:) to be used for variable explanations added to |
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| 46 | ! all variable declaration statements |
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[1] | 47 | ! |
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[1254] | 48 | ! 1253 2013-11-07 10:48:12Z fricke |
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| 49 | ! Bugfix: q is set to qr in case that q is smaller than qr |
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| 50 | ! |
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[1116] | 51 | ! 1115 2013-03-26 18:16:16Z hoffmann |
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| 52 | ! drizzle can be used independently from precipitation |
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| 53 | ! |
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[1054] | 54 | ! 1053 2012-11-13 17:11:03Z hoffmann |
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| 55 | ! description expanded to the two-moment cloud scheme |
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| 56 | ! |
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[1037] | 57 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 58 | ! code put under GPL (PALM 3.9) |
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| 59 | ! |
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[1] | 60 | ! Revision 1.1 2000/04/13 14:50:45 schroeter |
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| 61 | ! Initial revision |
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| 62 | ! |
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| 63 | ! |
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| 64 | ! |
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| 65 | ! Description: |
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| 66 | ! ------------ |
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[1682] | 67 | !> Calculation of the liquid water content (0%-or-100%-scheme). This scheme is |
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| 68 | !> used by the one and the two moment cloud physics scheme. Using the two moment |
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| 69 | !> scheme, this calculation results in the cloud water content. |
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[1] | 70 | !------------------------------------------------------------------------------! |
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[1682] | 71 | SUBROUTINE calc_liquid_water_content |
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| 72 | |
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[1] | 73 | |
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| 74 | |
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[1320] | 75 | USE arrays_3d, & |
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| 76 | ONLY: hyp, pt, q, qc, ql, qr |
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| 77 | |
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| 78 | USE cloud_parameters, & |
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| 79 | ONLY: l_d_cp, l_d_r, t_d_pt |
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| 80 | |
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| 81 | USE control_parameters, & |
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[1822] | 82 | ONLY: microphysics_seifert |
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[1320] | 83 | |
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| 84 | USE indices, & |
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| 85 | ONLY: nxlg, nxrg, nyng, nysg, nzb_s_inner, nzt |
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| 86 | |
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| 87 | USE kinds |
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| 88 | |
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[1] | 89 | USE pegrid |
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| 90 | |
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[1320] | 91 | |
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[1] | 92 | IMPLICIT NONE |
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| 93 | |
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[1682] | 94 | INTEGER(iwp) :: i !< |
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| 95 | INTEGER(iwp) :: j !< |
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| 96 | INTEGER(iwp) :: k !< |
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[1] | 97 | |
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[1682] | 98 | REAL(wp) :: alpha !< |
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| 99 | REAL(wp) :: e_s !< |
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| 100 | REAL(wp) :: q_s !< |
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| 101 | REAL(wp) :: t_l !< |
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[1] | 102 | |
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[667] | 103 | DO i = nxlg, nxrg |
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| 104 | DO j = nysg, nyng |
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[1115] | 105 | DO k = nzb_s_inner(j,i)+1, nzt |
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[1] | 106 | |
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| 107 | ! |
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| 108 | !-- Compute the liquid water temperature |
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| 109 | t_l = t_d_pt(k) * pt(k,j,i) |
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| 110 | |
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| 111 | ! |
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| 112 | !-- Compute saturation water vapor pressure at t_l |
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[1353] | 113 | e_s = 610.78_wp * EXP( 17.269_wp * ( t_l - 273.16_wp ) / & |
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| 114 | ( t_l - 35.86_wp ) ) |
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[1] | 115 | |
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| 116 | ! |
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| 117 | !-- Compute approximation of saturation humidity |
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[1353] | 118 | q_s = 0.622_wp * e_s / ( hyp(k) - 0.378_wp * e_s ) |
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[1] | 119 | |
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| 120 | ! |
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| 121 | !-- Correction factor |
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[1353] | 122 | alpha = 0.622_wp * l_d_r * l_d_cp / ( t_l * t_l ) |
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[1] | 123 | |
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| 124 | ! |
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| 125 | !-- Correction of the approximated value |
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| 126 | !-- (see: Cuijpers + Duynkerke, 1993, JAS, 23) |
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[1353] | 127 | q_s = q_s * ( 1.0_wp + alpha * q(k,j,i) ) / ( 1.0_wp + alpha * q_s ) |
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[1] | 128 | |
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| 129 | ! |
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| 130 | !-- Compute the liquid water content |
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[1822] | 131 | IF ( microphysics_seifert ) THEN |
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[1353] | 132 | IF ( ( q(k,j,i) - q_s - qr(k,j,i) ) > 0.0_wp ) THEN |
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[1115] | 133 | qc(k,j,i) = q(k,j,i) - q_s - qr(k,j,i) |
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| 134 | ql(k,j,i) = qc(k,j,i) + qr(k,j,i) |
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| 135 | ELSE |
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[1253] | 136 | IF ( q(k,j,i) < qr(k,j,i) ) q(k,j,i) = qr(k,j,i) |
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[1353] | 137 | qc(k,j,i) = 0.0_wp |
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[1115] | 138 | ql(k,j,i) = qr(k,j,i) |
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| 139 | ENDIF |
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[1822] | 140 | ELSE |
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[1353] | 141 | IF ( ( q(k,j,i) - q_s ) > 0.0_wp ) THEN |
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[1115] | 142 | qc(k,j,i) = q(k,j,i) - q_s |
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| 143 | ql(k,j,i) = qc(k,j,i) |
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| 144 | ELSE |
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[1822] | 145 | qc(k,j,i) = 0.0_wp |
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[1353] | 146 | ql(k,j,i) = 0.0_wp |
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[1115] | 147 | ENDIF |
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[1] | 148 | ENDIF |
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| 149 | ENDDO |
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| 150 | ENDDO |
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| 151 | ENDDO |
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| 152 | |
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| 153 | END SUBROUTINE calc_liquid_water_content |
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