| 1 | MODULE eqn_state_seawater_mod |
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| 2 | |
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| 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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| 17 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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| 18 | !------------------------------------------------------------------------------! |
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| 19 | ! |
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| 20 | ! Current revisions: |
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| 21 | ! ----------------- |
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| 22 | ! ONLY-attribute added to USE-statements, |
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| 23 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 24 | ! kinds are defined in new module kinds, |
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| 25 | ! old module precision_kind is removed, |
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| 26 | ! revision history before 2012 removed, |
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| 27 | ! comment fields (!:) to be used for variable explanations added to |
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| 28 | ! all variable declaration statements |
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| 29 | ! |
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| 30 | ! Former revisions: |
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| 31 | ! ----------------- |
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| 32 | ! $Id: eqn_state_seawater.f90 1320 2014-03-20 08:40:49Z raasch $ |
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| 33 | ! |
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| 34 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 35 | ! code put under GPL (PALM 3.9) |
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| 36 | ! |
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| 37 | ! 97 2007-06-21 08:23:15Z raasch |
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| 38 | ! Initial revision |
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| 39 | ! |
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| 40 | ! |
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| 41 | ! Description: |
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| 42 | ! ------------ |
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| 43 | ! Equation of state for seawater as a function of potential temperature, |
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| 44 | ! salinity, and pressure. |
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| 45 | ! For coefficients see Jackett et al., 2006: J. Atm. Ocean Tech. |
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| 46 | ! eqn_state_seawater calculates the potential density referred at hyp(0). |
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| 47 | ! eqn_state_seawater_func calculates density. |
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| 48 | !------------------------------------------------------------------------------! |
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| 49 | |
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| 50 | USE kinds |
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| 51 | |
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| 52 | IMPLICIT NONE |
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| 53 | |
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| 54 | PRIVATE |
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| 55 | PUBLIC eqn_state_seawater, eqn_state_seawater_func |
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| 56 | |
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| 57 | REAL(wp), DIMENSION(12), PARAMETER :: nom = & |
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| 58 | (/ 9.9984085444849347D2, 7.3471625860981584D0, & |
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| 59 | -5.3211231792841769D-2, 3.6492439109814549D-4, & |
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| 60 | 2.5880571023991390D0, -6.7168282786692354D-3, & |
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| 61 | 1.9203202055760151D-3, 1.1798263740430364D-2, & |
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| 62 | 9.8920219266399117D-8, 4.6996642771754730D-6, & |
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| 63 | -2.5862187075154352D-8, -3.2921414007960662D-12 /) |
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| 64 | !: |
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| 65 | |
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| 66 | REAL(wp), DIMENSION(13), PARAMETER :: den = & |
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| 67 | (/ 1.0D0, 7.2815210113327091D-3, & |
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| 68 | -4.4787265461983921D-5, 3.3851002965802430D-7, & |
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| 69 | 1.3651202389758572D-10, 1.7632126669040377D-3, & |
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| 70 | -8.8066583251206474D-6, -1.8832689434804897D-10, & |
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| 71 | 5.7463776745432097D-6, 1.4716275472242334D-9, & |
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| 72 | 6.7103246285651894D-6, -2.4461698007024582D-17, & |
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| 73 | -9.1534417604289062D-18 /) |
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| 74 | !: |
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| 75 | |
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| 76 | INTERFACE eqn_state_seawater |
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| 77 | MODULE PROCEDURE eqn_state_seawater |
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| 78 | MODULE PROCEDURE eqn_state_seawater_ij |
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| 79 | END INTERFACE eqn_state_seawater |
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| 80 | |
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| 81 | INTERFACE eqn_state_seawater_func |
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| 82 | MODULE PROCEDURE eqn_state_seawater_func |
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| 83 | END INTERFACE eqn_state_seawater_func |
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| 84 | |
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| 85 | CONTAINS |
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| 86 | |
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| 87 | |
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| 88 | !------------------------------------------------------------------------------! |
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| 89 | ! Call for all grid points |
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| 90 | !------------------------------------------------------------------------------! |
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| 91 | SUBROUTINE eqn_state_seawater |
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| 92 | |
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| 93 | USE arrays_3d, & |
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| 94 | ONLY: hyp, prho, pt_p, rho, sa_p |
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| 95 | USE indices, & |
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| 96 | ONLY: nxl, nxr, nyn, nys, nzb_s_inner, nzt |
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| 97 | |
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| 98 | IMPLICIT NONE |
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| 99 | |
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| 100 | INTEGER(iwp) :: i !: |
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| 101 | INTEGER(iwp) :: j !: |
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| 102 | INTEGER(iwp) :: k !: |
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| 103 | |
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| 104 | REAL(wp) :: pden !: |
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| 105 | REAL(wp) :: pnom !: |
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| 106 | REAL(wp) :: p1 !: |
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| 107 | REAL(wp) :: p2 !: |
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| 108 | REAL(wp) :: p3 !: |
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| 109 | REAL(wp) :: pt1 !: |
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| 110 | REAL(wp) :: pt2 !: |
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| 111 | REAL(wp) :: pt3 !: |
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| 112 | REAL(wp) :: pt4 !: |
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| 113 | REAL(wp) :: sa1 !: |
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| 114 | REAL(wp) :: sa15 !: |
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| 115 | REAL(wp) :: sa2 !: |
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| 116 | |
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| 117 | |
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| 118 | |
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| 119 | DO i = nxl, nxr |
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| 120 | DO j = nys, nyn |
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| 121 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 122 | ! |
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| 123 | !-- Pressure is needed in dbar |
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| 124 | p1 = hyp(k) * 1E-4 |
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| 125 | p2 = p1 * p1 |
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| 126 | p3 = p2 * p1 |
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| 127 | |
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| 128 | ! |
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| 129 | !-- Temperature needed in degree Celsius |
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| 130 | pt1 = pt_p(k,j,i) - 273.15 |
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| 131 | pt2 = pt1 * pt1 |
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| 132 | pt3 = pt1 * pt2 |
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| 133 | pt4 = pt2 * pt2 |
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| 134 | |
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| 135 | sa1 = sa_p(k,j,i) |
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| 136 | sa15 = sa1 * SQRT( sa1 ) |
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| 137 | sa2 = sa1 * sa1 |
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| 138 | |
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| 139 | pnom = nom(1) + nom(2)*pt1 + nom(3)*pt2 + & |
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| 140 | nom(4)*pt3 + nom(5)*sa1 + nom(6)*sa1*pt1 + & |
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| 141 | nom(7)*sa2 |
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| 142 | |
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| 143 | pden = den(1) + den(2)*pt1 + den(3)*pt2 + & |
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| 144 | den(4)*pt3 + den(5)*pt4 + den(6)*sa1 + & |
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| 145 | den(7)*sa1*pt1 + den(8)*sa1*pt3 + den(9)*sa15 + & |
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| 146 | den(10)*sa15*pt2 |
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| 147 | |
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| 148 | ! |
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| 149 | !-- Potential density (without pressure terms) |
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| 150 | prho(k,j,i) = pnom / pden |
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| 151 | |
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| 152 | pnom = pnom + nom(8)*p1 + nom(9)*p1*pt2 + & |
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| 153 | nom(10)*p1*sa1 + nom(11)*p2 + nom(12)*p2*pt2 |
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| 154 | |
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| 155 | pden = pden + den(11)*p1 + den(12)*p2*pt3 + & |
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| 156 | den(13)*p3*pt1 |
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| 157 | |
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| 158 | ! |
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| 159 | !-- In-situ density |
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| 160 | rho(k,j,i) = pnom / pden |
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| 161 | |
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| 162 | ENDDO |
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| 163 | ! |
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| 164 | !-- Neumann conditions are assumed at bottom and top boundary |
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| 165 | prho(nzt+1,j,i) = prho(nzt,j,i) |
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| 166 | prho(nzb_s_inner(j,i),j,i) = prho(nzb_s_inner(j,i)+1,j,i) |
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| 167 | rho(nzt+1,j,i) = rho(nzt,j,i) |
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| 168 | rho(nzb_s_inner(j,i),j,i) = rho(nzb_s_inner(j,i)+1,j,i) |
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| 169 | |
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| 170 | ENDDO |
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| 171 | ENDDO |
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| 172 | |
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| 173 | END SUBROUTINE eqn_state_seawater |
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| 174 | |
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| 175 | |
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| 176 | !------------------------------------------------------------------------------! |
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| 177 | ! Call for grid point i,j |
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| 178 | !------------------------------------------------------------------------------! |
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| 179 | SUBROUTINE eqn_state_seawater_ij( i, j ) |
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| 180 | |
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| 181 | USE arrays_3d, & |
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| 182 | ONLY: hyp, prho, pt_p, rho, sa_p |
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| 183 | |
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| 184 | USE indices, & |
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| 185 | ONLY: nzb_s_inner, nzt |
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| 186 | |
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| 187 | IMPLICIT NONE |
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| 188 | |
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| 189 | INTEGER(iwp) :: i, j, k |
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| 190 | |
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| 191 | REAL(wp) :: pden, pnom, p1, p2, p3, pt1, pt2, pt3, pt4, sa1, sa15, & |
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| 192 | sa2 |
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| 193 | |
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| 194 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 195 | ! |
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| 196 | !-- Pressure is needed in dbar |
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| 197 | p1 = hyp(k) * 1E-4 |
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| 198 | p2 = p1 * p1 |
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| 199 | p3 = p2 * p1 |
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| 200 | |
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| 201 | ! |
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| 202 | !-- Temperature needed in degree Celsius |
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| 203 | pt1 = pt_p(k,j,i) - 273.15 |
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| 204 | pt2 = pt1 * pt1 |
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| 205 | pt3 = pt1 * pt2 |
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| 206 | pt4 = pt2 * pt2 |
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| 207 | |
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| 208 | sa1 = sa_p(k,j,i) |
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| 209 | sa15 = sa1 * SQRT( sa1 ) |
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| 210 | sa2 = sa1 * sa1 |
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| 211 | |
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| 212 | pnom = nom(1) + nom(2)*pt1 + nom(3)*pt2 + & |
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| 213 | nom(4)*pt3 + nom(5)*sa1 + nom(6)*sa1*pt1 + & |
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| 214 | nom(7)*sa2 |
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| 215 | |
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| 216 | pden = den(1) + den(2)*pt1 + den(3)*pt2 + & |
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| 217 | den(4)*pt3 + den(5)*pt4 + den(6)*sa1 + & |
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| 218 | den(7)*sa1*pt1 + den(8)*sa1*pt3 + den(9)*sa15 + & |
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| 219 | den(10)*sa15*pt2 |
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| 220 | |
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| 221 | ! |
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| 222 | !-- Potential density (without pressure terms) |
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| 223 | prho(k,j,i) = pnom / pden |
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| 224 | |
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| 225 | pnom = pnom + nom(8)*p1 + nom(9)*p1*pt2 + & |
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| 226 | nom(10)*p1*sa1 + nom(11)*p2 + nom(12)*p2*pt2 |
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| 227 | pden = pden + den(11)*p1 + den(12)*p2*pt3 + & |
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| 228 | den(13)*p3*pt1 |
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| 229 | |
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| 230 | ! |
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| 231 | !-- In-situ density |
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| 232 | rho(k,j,i) = pnom / pden |
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| 233 | |
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| 234 | |
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| 235 | ENDDO |
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| 236 | |
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| 237 | ! |
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| 238 | !-- Neumann conditions are assumed at bottom and top boundary |
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| 239 | prho(nzt+1,j,i) = prho(nzt,j,i) |
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| 240 | prho(nzb_s_inner(j,i),j,i) = prho(nzb_s_inner(j,i)+1,j,i) |
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| 241 | rho(nzt+1,j,i) = rho(nzt,j,i) |
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| 242 | rho(nzb_s_inner(j,i),j,i) = rho(nzb_s_inner(j,i)+1,j,i) |
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| 243 | |
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| 244 | END SUBROUTINE eqn_state_seawater_ij |
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| 245 | |
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| 246 | |
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| 247 | !------------------------------------------------------------------------------! |
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| 248 | ! Equation of state as a function |
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| 249 | !------------------------------------------------------------------------------! |
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| 250 | REAL(wp) FUNCTION eqn_state_seawater_func( p, pt, sa ) |
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| 251 | |
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| 252 | IMPLICIT NONE |
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| 253 | |
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| 254 | REAL(wp) :: p !: |
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| 255 | REAL(wp) :: p1 !: |
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| 256 | REAL(wp) :: p2 !: |
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| 257 | REAL(wp) :: p3 !: |
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| 258 | REAL(wp) :: pt !: |
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| 259 | REAL(wp) :: pt1 !: |
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| 260 | REAL(wp) :: pt2 !: |
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| 261 | REAL(wp) :: pt3 !: |
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| 262 | REAL(wp) :: pt4 !: |
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| 263 | REAL(wp) :: sa !: |
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| 264 | REAL(wp) :: sa15 !: |
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| 265 | REAL(wp) :: sa2 !: |
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| 266 | |
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| 267 | ! |
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| 268 | !-- Pressure is needed in dbar |
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| 269 | p1 = p * 1E-4 |
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| 270 | p2 = p1 * p1 |
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| 271 | p3 = p2 * p1 |
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| 272 | |
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| 273 | ! |
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| 274 | !-- Temperature needed in degree Celsius |
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| 275 | pt1 = pt - 273.15 |
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| 276 | pt2 = pt1 * pt1 |
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| 277 | pt3 = pt1 * pt2 |
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| 278 | pt4 = pt2 * pt2 |
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| 279 | |
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| 280 | sa15 = sa * SQRT( sa ) |
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| 281 | sa2 = sa * sa |
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| 282 | |
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| 283 | |
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| 284 | eqn_state_seawater_func = & |
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| 285 | ( nom(1) + nom(2)*pt1 + nom(3)*pt2 + nom(4)*pt3 + & |
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| 286 | nom(5)*sa + nom(6)*sa*pt1 + nom(7)*sa2 + nom(8)*p1 + & |
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| 287 | nom(9)*p1*pt2 + nom(10)*p1*sa + nom(11)*p2 + nom(12)*p2*pt2 & |
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| 288 | ) / & |
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| 289 | ( den(1) + den(2)*pt1 + den(3)*pt2 + den(4)*pt3 + & |
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| 290 | den(5)*pt4 + den(6)*sa + den(7)*sa*pt1 + den(8)*sa*pt3 + & |
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| 291 | den(9)*sa15 + den(10)*sa15*pt2 + den(11)*p1 + den(12)*p2*pt3 + & |
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| 292 | den(13)*p3*pt1 & |
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| 293 | ) |
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| 294 | |
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| 295 | |
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| 296 | END FUNCTION eqn_state_seawater_func |
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| 297 | |
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| 298 | END MODULE eqn_state_seawater_mod |
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