1 | SUBROUTINE init_ocean |
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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 1997-2012 Leibniz University 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 | ! |
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23 | ! |
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24 | ! Former revisions: |
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25 | ! ------------------ |
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26 | ! $Id: init_ocean.f90 1036 2012-10-22 13:43:42Z raasch $ |
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27 | ! |
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28 | ! 388 2009-09-23 09:40:33Z raasch |
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29 | ! Bugfix: Initial profiles of hydrostatic pressure and density are calculated |
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30 | ! iteratively. First calculation of hyp(0) changed. |
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31 | ! |
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32 | ! 124 2007-10-19 15:47:46Z raasch |
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33 | ! Bugfix: Initial density rho is calculated |
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34 | ! |
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35 | ! 97 2007-06-21 08:23:15Z raasch |
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36 | ! Initial revision |
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37 | ! |
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38 | ! Description: |
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39 | ! ------------ |
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40 | ! Initialization of quantities needed for the ocean version |
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41 | !------------------------------------------------------------------------------! |
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42 | |
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43 | USE arrays_3d |
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44 | USE control_parameters |
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45 | USE eqn_state_seawater_mod |
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46 | USE pegrid |
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47 | USE grid_variables |
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48 | USE indices |
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49 | |
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50 | IMPLICIT NONE |
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51 | |
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52 | INTEGER :: k, n |
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53 | |
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54 | REAL :: sa_l, pt_l |
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55 | |
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56 | REAL, DIMENSION(nzb:nzt+1) :: rho_init |
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57 | |
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58 | ALLOCATE( hyp(nzb:nzt+1) ) |
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59 | |
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60 | ! |
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61 | !-- Set water density near the ocean surface |
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62 | rho_surface = 1027.62 |
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63 | |
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64 | ! |
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65 | !-- Calculate initial vertical profile of hydrostatic pressure (in Pa) |
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66 | !-- and the reference density (used later in buoyancy term) |
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67 | !-- First step: Calculate pressure using reference density |
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68 | hyp(nzt+1) = surface_pressure * 100.0 |
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69 | |
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70 | hyp(nzt) = hyp(nzt+1) + rho_surface * g * 0.5 * dzu(nzt+1) |
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71 | rho_init(nzt) = rho_surface |
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72 | |
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73 | DO k = nzt-1, 1, -1 |
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74 | hyp(k) = hyp(k+1) + rho_surface * g * dzu(k) |
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75 | ENDDO |
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76 | hyp(0) = hyp(1) + rho_surface * g * dzu(1) |
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77 | |
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78 | ! |
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79 | !-- Second step: Iteratively calculate in situ density (based on presssure) |
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80 | !-- and pressure (based on in situ density) |
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81 | DO n = 1, 5 |
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82 | |
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83 | rho_reference = rho_surface * 0.5 * dzu(nzt+1) |
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84 | |
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85 | DO k = nzt-1, 0, -1 |
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86 | |
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87 | sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) |
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88 | pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) |
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89 | |
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90 | rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l ) |
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91 | |
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92 | rho_reference = rho_reference + rho_init(k) * dzu(k+1) |
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93 | |
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94 | ENDDO |
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95 | |
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96 | rho_reference = rho_reference / ( zw(nzt) - zu(nzb) ) |
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97 | |
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98 | DO k = nzt-1, 0, -1 |
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99 | hyp(k) = hyp(k+1) + g * 0.5 * ( rho_init(k) + rho_init(k+1 ) ) * & |
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100 | dzu(k+1) |
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101 | ENDDO |
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102 | |
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103 | ENDDO |
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104 | |
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105 | ! |
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106 | !-- Calculate the reference potential density |
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107 | prho_reference = 0.0 |
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108 | DO k = 0, nzt |
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109 | |
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110 | sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) |
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111 | pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) |
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112 | |
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113 | prho_reference = prho_reference + dzu(k+1) * & |
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114 | eqn_state_seawater_func( 0.0, pt_l, sa_l ) |
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115 | |
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116 | ENDDO |
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117 | |
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118 | prho_reference = prho_reference / ( zu(nzt) - zu(nzb) ) |
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119 | |
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120 | ! |
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121 | !-- Calculate the 3d array of initial in situ and potential density, |
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122 | !-- based on the initial temperature and salinity profile |
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123 | CALL eqn_state_seawater |
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124 | |
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125 | |
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126 | END SUBROUTINE init_ocean |
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