1 | SUBROUTINE init_ocean |
---|
2 | |
---|
3 | !------------------------------------------------------------------------------! |
---|
4 | ! Actual revisions: |
---|
5 | ! ----------------- |
---|
6 | ! Bugfix: Initial profiles of hydrostatic pressure and density are calculated |
---|
7 | ! iteratively. First calculation of hyp(0) changed. |
---|
8 | ! |
---|
9 | ! Former revisions: |
---|
10 | ! ------------------ |
---|
11 | ! $Id: init_ocean.f90 388 2009-09-23 09:40:33Z raasch $ |
---|
12 | ! |
---|
13 | ! 124 2007-10-19 15:47:46Z raasch |
---|
14 | ! Bugfix: Initial density rho is calculated |
---|
15 | ! |
---|
16 | ! 97 2007-06-21 08:23:15Z raasch |
---|
17 | ! Initial revision |
---|
18 | ! |
---|
19 | ! Description: |
---|
20 | ! ------------ |
---|
21 | ! Initialization of quantities needed for the ocean version |
---|
22 | !------------------------------------------------------------------------------! |
---|
23 | |
---|
24 | USE arrays_3d |
---|
25 | USE control_parameters |
---|
26 | USE eqn_state_seawater_mod |
---|
27 | USE pegrid |
---|
28 | USE grid_variables |
---|
29 | USE indices |
---|
30 | |
---|
31 | IMPLICIT NONE |
---|
32 | |
---|
33 | INTEGER :: k, n |
---|
34 | |
---|
35 | REAL :: sa_l, pt_l |
---|
36 | |
---|
37 | REAL, DIMENSION(nzb:nzt+1) :: rho_init |
---|
38 | |
---|
39 | ALLOCATE( hyp(nzb:nzt+1) ) |
---|
40 | |
---|
41 | ! |
---|
42 | !-- Set water density near the ocean surface |
---|
43 | rho_surface = 1027.62 |
---|
44 | |
---|
45 | ! |
---|
46 | !-- Calculate initial vertical profile of hydrostatic pressure (in Pa) |
---|
47 | !-- and the reference density (used later in buoyancy term) |
---|
48 | !-- First step: Calculate pressure using reference density |
---|
49 | hyp(nzt+1) = surface_pressure * 100.0 |
---|
50 | |
---|
51 | hyp(nzt) = hyp(nzt+1) + rho_surface * g * 0.5 * dzu(nzt+1) |
---|
52 | rho_init(nzt) = rho_surface |
---|
53 | |
---|
54 | DO k = nzt-1, 1, -1 |
---|
55 | hyp(k) = hyp(k+1) + rho_surface * g * dzu(k) |
---|
56 | ENDDO |
---|
57 | hyp(0) = hyp(1) + rho_surface * g * dzu(1) |
---|
58 | |
---|
59 | ! |
---|
60 | !-- Second step: Iteratively calculate in situ density (based on presssure) |
---|
61 | !-- and pressure (based on in situ density) |
---|
62 | DO n = 1, 5 |
---|
63 | |
---|
64 | rho_reference = rho_surface * 0.5 * dzu(nzt+1) |
---|
65 | |
---|
66 | DO k = nzt-1, 0, -1 |
---|
67 | |
---|
68 | sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) |
---|
69 | pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) |
---|
70 | |
---|
71 | rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l ) |
---|
72 | |
---|
73 | rho_reference = rho_reference + rho_init(k) * dzu(k+1) |
---|
74 | |
---|
75 | ENDDO |
---|
76 | |
---|
77 | rho_reference = rho_reference / ( zw(nzt) - zu(nzb) ) |
---|
78 | |
---|
79 | DO k = nzt-1, 0, -1 |
---|
80 | hyp(k) = hyp(k+1) + g * 0.5 * ( rho_init(k) + rho_init(k+1 ) ) * & |
---|
81 | dzu(k+1) |
---|
82 | ENDDO |
---|
83 | |
---|
84 | ENDDO |
---|
85 | |
---|
86 | ! |
---|
87 | !-- Calculate the reference potential density |
---|
88 | prho_reference = 0.0 |
---|
89 | DO k = 0, nzt |
---|
90 | |
---|
91 | sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) |
---|
92 | pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) |
---|
93 | |
---|
94 | prho_reference = prho_reference + dzu(k+1) * & |
---|
95 | eqn_state_seawater_func( 0.0, pt_l, sa_l ) |
---|
96 | |
---|
97 | ENDDO |
---|
98 | |
---|
99 | prho_reference = prho_reference / ( zu(nzt) - zu(nzb) ) |
---|
100 | |
---|
101 | ! |
---|
102 | !-- Calculate the 3d array of initial in situ and potential density, |
---|
103 | !-- based on the initial temperature and salinity profile |
---|
104 | CALL eqn_state_seawater |
---|
105 | |
---|
106 | |
---|
107 | END SUBROUTINE init_ocean |
---|