| 1 | MODULE eqn_state_seawater_mod |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! Current 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 | ! $Id: eqn_state_seawater.f90 484 2010-02-05 07:36:54Z letzel $ |
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| 11 | ! |
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| 12 | ! 388 2009-09-23 09:40:33Z raasch |
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| 13 | ! Potential density is additionally calculated in eqn_state_seawater, |
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| 14 | ! first constant in array den also defined as type double. |
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| 15 | ! |
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| 16 | ! 97 2007-06-21 08:23:15Z raasch |
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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 | ! Equation of state for seawater as a function of potential temperature, |
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| 23 | ! salinity, and pressure. |
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| 24 | ! For coefficients see Jackett et al., 2006: J. Atm. Ocean Tech. |
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| 25 | ! eqn_state_seawater calculates the potential density referred at hyp(0). |
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| 26 | ! eqn_state_seawater_func calculates density. |
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| 27 | !------------------------------------------------------------------------------! |
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| 28 | |
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| 29 | IMPLICIT NONE |
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| 30 | |
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| 31 | PRIVATE |
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| 32 | PUBLIC eqn_state_seawater, eqn_state_seawater_func |
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| 33 | |
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| 34 | REAL, DIMENSION(12), PARAMETER :: nom = & |
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| 35 | (/ 9.9984085444849347D2, 7.3471625860981584D0, & |
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| 36 | -5.3211231792841769D-2, 3.6492439109814549D-4, & |
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| 37 | 2.5880571023991390D0, -6.7168282786692354D-3, & |
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| 38 | 1.9203202055760151D-3, 1.1798263740430364D-2, & |
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| 39 | 9.8920219266399117D-8, 4.6996642771754730D-6, & |
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| 40 | -2.5862187075154352D-8, -3.2921414007960662D-12 /) |
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| 41 | |
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| 42 | REAL, DIMENSION(13), PARAMETER :: den = & |
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| 43 | (/ 1.0D0, 7.2815210113327091D-3, & |
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| 44 | -4.4787265461983921D-5, 3.3851002965802430D-7, & |
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| 45 | 1.3651202389758572D-10, 1.7632126669040377D-3, & |
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| 46 | -8.8066583251206474D-6, -1.8832689434804897D-10, & |
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| 47 | 5.7463776745432097D-6, 1.4716275472242334D-9, & |
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| 48 | 6.7103246285651894D-6, -2.4461698007024582D-17, & |
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| 49 | -9.1534417604289062D-18 /) |
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| 50 | |
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| 51 | INTERFACE eqn_state_seawater |
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| 52 | MODULE PROCEDURE eqn_state_seawater |
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| 53 | MODULE PROCEDURE eqn_state_seawater_ij |
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| 54 | END INTERFACE eqn_state_seawater |
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| 55 | |
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| 56 | INTERFACE eqn_state_seawater_func |
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| 57 | MODULE PROCEDURE eqn_state_seawater_func |
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| 58 | END INTERFACE eqn_state_seawater_func |
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| 59 | |
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| 60 | CONTAINS |
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| 61 | |
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| 62 | |
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| 63 | !------------------------------------------------------------------------------! |
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| 64 | ! Call for all grid points |
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| 65 | !------------------------------------------------------------------------------! |
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| 66 | SUBROUTINE eqn_state_seawater |
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| 67 | |
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| 68 | USE arrays_3d |
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| 69 | USE indices |
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| 70 | |
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| 71 | IMPLICIT NONE |
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| 72 | |
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| 73 | INTEGER :: i, j, k |
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| 74 | |
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| 75 | REAL :: pden, pnom, p1, p2, p3, pt1, pt2, pt3, pt4, sa1, sa15, sa2 |
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| 76 | |
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| 77 | DO i = nxl, nxr |
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| 78 | DO j = nys, nyn |
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| 79 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 80 | ! |
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| 81 | !-- Pressure is needed in dbar |
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| 82 | p1 = hyp(k) * 1E-4 |
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| 83 | p2 = p1 * p1 |
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| 84 | p3 = p2 * p1 |
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| 85 | |
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| 86 | ! |
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| 87 | !-- Temperature needed in degree Celsius |
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| 88 | pt1 = pt_p(k,j,i) - 273.15 |
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| 89 | pt2 = pt1 * pt1 |
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| 90 | pt3 = pt1 * pt2 |
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| 91 | pt4 = pt2 * pt2 |
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| 92 | |
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| 93 | sa1 = sa_p(k,j,i) |
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| 94 | sa15 = sa1 * SQRT( sa1 ) |
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| 95 | sa2 = sa1 * sa1 |
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| 96 | |
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| 97 | pnom = nom(1) + nom(2)*pt1 + nom(3)*pt2 + & |
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| 98 | nom(4)*pt3 + nom(5)*sa1 + nom(6)*sa1*pt1 + & |
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| 99 | nom(7)*sa2 |
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| 100 | |
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| 101 | pden = den(1) + den(2)*pt1 + den(3)*pt2 + & |
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| 102 | den(4)*pt3 + den(5)*pt4 + den(6)*sa1 + & |
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| 103 | den(7)*sa1*pt1 + den(8)*sa1*pt3 + den(9)*sa15 + & |
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| 104 | den(10)*sa15*pt2 |
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| 105 | |
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| 106 | ! |
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| 107 | !-- Potential density (without pressure terms) |
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| 108 | prho(k,j,i) = pnom / pden |
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| 109 | |
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| 110 | pnom = pnom + nom(8)*p1 + nom(9)*p1*pt2 + & |
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| 111 | nom(10)*p1*sa1 + nom(11)*p2 + nom(12)*p2*pt2 |
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| 112 | |
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| 113 | pden = pden + den(11)*p1 + den(12)*p2*pt3 + & |
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| 114 | den(13)*p3*pt1 |
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| 115 | |
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| 116 | ! |
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| 117 | !-- In-situ density |
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| 118 | rho(k,j,i) = pnom / pden |
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| 119 | |
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| 120 | ENDDO |
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| 121 | ! |
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| 122 | !-- Neumann conditions are assumed at bottom and top boundary |
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| 123 | prho(nzt+1,j,i) = prho(nzt,j,i) |
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| 124 | prho(nzb_s_inner(j,i),j,i) = prho(nzb_s_inner(j,i)+1,j,i) |
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| 125 | rho(nzt+1,j,i) = rho(nzt,j,i) |
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| 126 | rho(nzb_s_inner(j,i),j,i) = rho(nzb_s_inner(j,i)+1,j,i) |
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| 127 | |
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| 128 | ENDDO |
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| 129 | ENDDO |
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| 130 | |
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| 131 | END SUBROUTINE eqn_state_seawater |
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| 132 | |
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| 133 | |
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| 134 | !------------------------------------------------------------------------------! |
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| 135 | ! Call for grid point i,j |
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| 136 | !------------------------------------------------------------------------------! |
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| 137 | SUBROUTINE eqn_state_seawater_ij( i, j ) |
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| 138 | |
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| 139 | USE arrays_3d |
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| 140 | USE indices |
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| 141 | |
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| 142 | IMPLICIT NONE |
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| 143 | |
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| 144 | INTEGER :: i, j, k |
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| 145 | |
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| 146 | REAL :: pden, pnom, p1, p2, p3, pt1, pt2, pt3, pt4, sa1, sa15, sa2 |
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| 147 | |
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| 148 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 149 | ! |
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| 150 | !-- Pressure is needed in dbar |
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| 151 | p1 = hyp(k) * 1E-4 |
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| 152 | p2 = p1 * p1 |
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| 153 | p3 = p2 * p1 |
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| 154 | |
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| 155 | ! |
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| 156 | !-- Temperature needed in degree Celsius |
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| 157 | pt1 = pt_p(k,j,i) - 273.15 |
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| 158 | pt2 = pt1 * pt1 |
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| 159 | pt3 = pt1 * pt2 |
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| 160 | pt4 = pt2 * pt2 |
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| 161 | |
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| 162 | sa1 = sa_p(k,j,i) |
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| 163 | sa15 = sa1 * SQRT( sa1 ) |
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| 164 | sa2 = sa1 * sa1 |
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| 165 | |
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| 166 | pnom = nom(1) + nom(2)*pt1 + nom(3)*pt2 + & |
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| 167 | nom(4)*pt3 + nom(5)*sa1 + nom(6)*sa1*pt1 + & |
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| 168 | nom(7)*sa2 |
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| 169 | |
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| 170 | pden = den(1) + den(2)*pt1 + den(3)*pt2 + & |
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| 171 | den(4)*pt3 + den(5)*pt4 + den(6)*sa1 + & |
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| 172 | den(7)*sa1*pt1 + den(8)*sa1*pt3 + den(9)*sa15 + & |
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| 173 | den(10)*sa15*pt2 |
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| 174 | |
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| 175 | ! |
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| 176 | !-- Potential density (without pressure terms) |
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| 177 | prho(k,j,i) = pnom / pden |
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| 178 | |
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| 179 | pnom = pnom + nom(8)*p1 + nom(9)*p1*pt2 + & |
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| 180 | nom(10)*p1*sa1 + nom(11)*p2 + nom(12)*p2*pt2 |
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| 181 | pden = pden + den(11)*p1 + den(12)*p2*pt3 + & |
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| 182 | den(13)*p3*pt1 |
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| 183 | |
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| 184 | ! |
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| 185 | !-- In-situ density |
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| 186 | rho(k,j,i) = pnom / pden |
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| 187 | |
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| 188 | |
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| 189 | ENDDO |
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| 190 | |
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| 191 | ! |
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| 192 | !-- Neumann conditions are assumed at bottom and top boundary |
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| 193 | prho(nzt+1,j,i) = prho(nzt,j,i) |
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| 194 | prho(nzb_s_inner(j,i),j,i) = prho(nzb_s_inner(j,i)+1,j,i) |
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| 195 | rho(nzt+1,j,i) = rho(nzt,j,i) |
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| 196 | rho(nzb_s_inner(j,i),j,i) = rho(nzb_s_inner(j,i)+1,j,i) |
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| 197 | |
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| 198 | END SUBROUTINE eqn_state_seawater_ij |
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| 199 | |
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| 200 | |
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| 201 | !------------------------------------------------------------------------------! |
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| 202 | ! Equation of state as a function |
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| 203 | !------------------------------------------------------------------------------! |
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| 204 | REAL FUNCTION eqn_state_seawater_func( p, pt, sa ) |
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| 205 | |
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| 206 | IMPLICIT NONE |
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| 207 | |
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| 208 | REAL :: p, p1, p2, p3, pt, pt1, pt2, pt3, pt4, sa, sa15, sa2 |
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| 209 | |
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| 210 | ! |
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| 211 | !-- Pressure is needed in dbar |
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| 212 | p1 = p * 1E-4 |
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| 213 | p2 = p1 * p1 |
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| 214 | p3 = p2 * p1 |
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| 215 | |
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| 216 | ! |
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| 217 | !-- Temperature needed in degree Celsius |
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| 218 | pt1 = pt - 273.15 |
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| 219 | pt2 = pt1 * pt1 |
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| 220 | pt3 = pt1 * pt2 |
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| 221 | pt4 = pt2 * pt2 |
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| 222 | |
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| 223 | sa15 = sa * SQRT( sa ) |
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| 224 | sa2 = sa * sa |
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| 225 | |
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| 226 | |
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| 227 | eqn_state_seawater_func = & |
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| 228 | ( nom(1) + nom(2)*pt1 + nom(3)*pt2 + nom(4)*pt3 + & |
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| 229 | nom(5)*sa + nom(6)*sa*pt1 + nom(7)*sa2 + nom(8)*p1 + & |
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| 230 | nom(9)*p1*pt2 + nom(10)*p1*sa + nom(11)*p2 + nom(12)*p2*pt2 & |
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| 231 | ) / & |
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| 232 | ( den(1) + den(2)*pt1 + den(3)*pt2 + den(4)*pt3 + & |
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| 233 | den(5)*pt4 + den(6)*sa + den(7)*sa*pt1 + den(8)*sa*pt3 + & |
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| 234 | den(9)*sa15 + den(10)*sa15*pt2 + den(11)*p1 + den(12)*p2*pt3 + & |
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| 235 | den(13)*p3*pt1 & |
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| 236 | ) |
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| 237 | |
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| 238 | |
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| 239 | END FUNCTION eqn_state_seawater_func |
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| 240 | |
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| 241 | END MODULE eqn_state_seawater_mod |
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