1 | SUBROUTINE init_ocean |
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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: init_ocean.f90 484 2010-02-05 07:36:54Z raasch $ |
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11 | ! |
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12 | ! 388 2009-09-23 09:40:33Z raasch |
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13 | ! Bugfix: Initial profiles of hydrostatic pressure and density are calculated |
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14 | ! iteratively. First calculation of hyp(0) changed. |
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15 | ! |
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16 | ! 124 2007-10-19 15:47:46Z raasch |
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17 | ! Bugfix: Initial density rho is calculated |
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18 | ! |
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19 | ! 97 2007-06-21 08:23:15Z raasch |
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20 | ! Initial revision |
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21 | ! |
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22 | ! Description: |
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23 | ! ------------ |
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24 | ! Initialization of quantities needed for the ocean version |
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25 | !------------------------------------------------------------------------------! |
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26 | |
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27 | USE arrays_3d |
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28 | USE control_parameters |
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29 | USE eqn_state_seawater_mod |
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30 | USE pegrid |
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31 | USE grid_variables |
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32 | USE indices |
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33 | |
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34 | IMPLICIT NONE |
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35 | |
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36 | INTEGER :: k, n |
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37 | |
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38 | REAL :: sa_l, pt_l |
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39 | |
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40 | REAL, DIMENSION(nzb:nzt+1) :: rho_init |
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41 | |
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42 | ALLOCATE( hyp(nzb:nzt+1) ) |
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43 | |
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44 | ! |
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45 | !-- Set water density near the ocean surface |
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46 | rho_surface = 1027.62 |
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47 | |
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48 | ! |
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49 | !-- Calculate initial vertical profile of hydrostatic pressure (in Pa) |
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50 | !-- and the reference density (used later in buoyancy term) |
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51 | !-- First step: Calculate pressure using reference density |
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52 | hyp(nzt+1) = surface_pressure * 100.0 |
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53 | |
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54 | hyp(nzt) = hyp(nzt+1) + rho_surface * g * 0.5 * dzu(nzt+1) |
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55 | rho_init(nzt) = rho_surface |
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56 | |
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57 | DO k = nzt-1, 1, -1 |
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58 | hyp(k) = hyp(k+1) + rho_surface * g * dzu(k) |
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59 | ENDDO |
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60 | hyp(0) = hyp(1) + rho_surface * g * dzu(1) |
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61 | |
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62 | ! |
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63 | !-- Second step: Iteratively calculate in situ density (based on presssure) |
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64 | !-- and pressure (based on in situ density) |
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65 | DO n = 1, 5 |
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66 | |
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67 | rho_reference = rho_surface * 0.5 * dzu(nzt+1) |
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68 | |
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69 | DO k = nzt-1, 0, -1 |
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70 | |
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71 | sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) |
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72 | pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) |
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73 | |
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74 | rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l ) |
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75 | |
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76 | rho_reference = rho_reference + rho_init(k) * dzu(k+1) |
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77 | |
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78 | ENDDO |
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79 | |
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80 | rho_reference = rho_reference / ( zw(nzt) - zu(nzb) ) |
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81 | |
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82 | DO k = nzt-1, 0, -1 |
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83 | hyp(k) = hyp(k+1) + g * 0.5 * ( rho_init(k) + rho_init(k+1 ) ) * & |
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84 | dzu(k+1) |
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85 | ENDDO |
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86 | |
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87 | ENDDO |
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88 | |
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89 | ! |
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90 | !-- Calculate the reference potential density |
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91 | prho_reference = 0.0 |
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92 | DO k = 0, nzt |
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93 | |
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94 | sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) |
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95 | pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) |
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96 | |
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97 | prho_reference = prho_reference + dzu(k+1) * & |
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98 | eqn_state_seawater_func( 0.0, pt_l, sa_l ) |
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99 | |
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100 | ENDDO |
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101 | |
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102 | prho_reference = prho_reference / ( zu(nzt) - zu(nzb) ) |
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103 | |
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104 | ! |
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105 | !-- Calculate the 3d array of initial in situ and potential density, |
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106 | !-- based on the initial temperature and salinity profile |
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107 | CALL eqn_state_seawater |
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108 | |
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109 | |
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110 | END SUBROUTINE init_ocean |
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