| 1 | MODULE orbit_param_criterion_mod |
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| 2 | |
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| 3 | !======================================================================= |
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| 4 | ! |
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| 5 | ! Purpose: Compute the maximum number of iteration for PEM based on the |
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| 6 | ! stopping criterion given by the orbital parameters |
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| 7 | ! |
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| 8 | ! Author: RV, JBC |
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| 9 | !======================================================================= |
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| 10 | |
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| 11 | IMPLICIT NONE |
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| 12 | |
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| 13 | CONTAINS |
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| 14 | |
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| 15 | SUBROUTINE orbit_param_criterion(i_myear,year_iter_max) |
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| 16 | |
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| 17 | #ifdef CPP_IOIPSL |
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| 18 | use IOIPSL, only: getin |
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| 19 | #else |
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| 20 | ! if not using IOIPSL, we still need to use (a local version of) getin |
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| 21 | use ioipsl_getincom, only: getin |
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| 22 | #endif |
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| 23 | #ifndef CPP_STD |
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| 24 | use planete_h, only: e_elips, obliquit, timeperi |
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| 25 | #else |
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| 26 | use planete_mod, only: e_elips, obliquit, timeperi |
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| 27 | #endif |
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| 28 | use time_evol_mod, only: year_bp_ini, var_obl, var_ecc, var_lsp, convert_years |
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| 29 | use comconst_mod, only: pi |
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| 30 | use lask_param_mod, only: yearlask, obllask, ecclask, lsplask, ini_lask_param_mod, last_ilask |
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| 31 | |
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| 32 | IMPLICIT NONE |
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| 33 | |
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| 34 | !-------------------------------------------------------- |
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| 35 | ! Input Variables |
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| 36 | !-------------------------------------------------------- |
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| 37 | integer, intent(in) :: i_myear ! Martian year of the simulation |
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| 38 | |
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| 39 | !-------------------------------------------------------- |
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| 40 | ! Output Variables |
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| 41 | !-------------------------------------------------------- |
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| 42 | integer, intent(out) :: year_iter_max ! Maximum number of iteration of the PEM before orb changes too much |
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| 43 | |
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| 44 | !-------------------------------------------------------- |
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| 45 | ! Local variables |
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| 46 | !-------------------------------------------------------- |
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| 47 | integer :: Year ! Year of the simulation |
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| 48 | real :: Lsp ! Ls perihelion |
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| 49 | real :: max_change_obl, max_change_ecc, max_change_lsp ! Maximum admissible change |
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| 50 | real :: max_obl, max_ecc, max_lsp ! Maximum value of orbit param given the admissible change |
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| 51 | real :: min_obl, min_ecc, min_lsp ! Minimum value of orbit param given the admissible change |
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| 52 | integer :: max_obl_iter, max_ecc_iter, max_lsp_iter ! Maximum year iteration before reaching an inadmissible value of orbit param |
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| 53 | integer :: ilask, iylask ! Loop variables |
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| 54 | real :: xa, xb, ya, yb, yc_obl, yc_ecc, yc_lsp ! Variables for interpolation |
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| 55 | |
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| 56 | ! ********************************************************************** |
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| 57 | ! 0. Initializations |
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| 58 | ! ********************************************************************** |
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| 59 | Year = year_bp_ini + i_myear ! We compute the current year |
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| 60 | Lsp = modulo(-timeperi*180./pi,360.) ! We convert in degree |
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| 61 | |
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| 62 | call ini_lask_param_mod ! Allocation of variables |
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| 63 | |
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| 64 | write(*,*) 'orbit_param_criterion, Current year =', Year |
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| 65 | write(*,*) 'orbit_param_criterion, Current obl. =', obliquit |
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| 66 | write(*,*) 'orbit_param_criterion, Current ecc. =', e_elips |
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| 67 | write(*,*) 'orbit_param_criterion, Current Lsp =', Lsp |
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| 68 | |
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| 69 | ! We read the file |
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| 70 | open(73,file = 'obl_ecc_lsp.asc') |
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| 71 | do ilask = 1,size(yearlask,1) |
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| 72 | read(73,*) yearlask(ilask), obllask(ilask), ecclask(ilask), lsplask(ilask) |
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| 73 | yearlask(ilask) = yearlask(ilask)*1000./convert_years ! Conversion from Laskar's kilo Earth years to PEM Martian years |
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| 74 | if (yearlask(ilask) > Year) last_ilask = ilask + 1 |
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| 75 | enddo |
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| 76 | close(73) |
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| 77 | write(*,*) 'Corresponding line in the obl_ecc_lsp.asc file =', last_ilask |
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| 78 | |
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| 79 | ! Constant max change case |
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| 80 | max_change_obl = 0.6 |
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| 81 | max_change_ecc = 2.8e-3 |
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| 82 | max_change_lsp = 18. |
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| 83 | |
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| 84 | call getin('max_change_obl', max_change_obl) |
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| 85 | max_obl = obliquit + max_change_obl |
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| 86 | min_obl = obliquit - max_change_obl |
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| 87 | write(*,*) 'Maximum obliquity accepted =', max_obl |
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| 88 | write(*,*) 'Minimum obliquity accepted =', min_obl |
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| 89 | |
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| 90 | call getin('max_change_ecc', max_change_ecc) |
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| 91 | max_ecc = min(e_elips + max_change_ecc,1. - 1.e-10) ! ex < 1. |
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| 92 | min_ecc = max(e_elips - max_change_ecc,0.) ! ex >= 0. |
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| 93 | write(*,*) 'Maximum eccentricity accepted =', max_ecc |
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| 94 | write(*,*) 'Minimum eccentricity accepted =', min_ecc |
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| 95 | |
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| 96 | call getin('max_change_lsp', max_change_lsp) |
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| 97 | max_lsp = Lsp + max_change_lsp |
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| 98 | min_lsp = Lsp - max_change_lsp |
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| 99 | write(*,*) 'Maximum Lsp accepted =', max_lsp |
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| 100 | write(*,*) 'Minimum Lsp accepted =', min_lsp |
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| 101 | ! End Constant max change case |
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| 102 | |
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| 103 | ! If we do not want some orb parameter to change, they should not be a stopping criterion, |
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| 104 | ! So the number of iteration corresponding is set to maximum |
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| 105 | max_obl_iter = 1000000 |
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| 106 | max_ecc_iter = 1000000 |
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| 107 | max_lsp_iter = 1000000 |
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| 108 | |
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| 109 | ! Tendency of the orbital parameter for the considered year gives the limitation between min and max |
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| 110 | do ilask = last_ilask,2,-1 |
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| 111 | xa = yearlask(ilask) |
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| 112 | xb = yearlask(ilask - 1) |
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| 113 | if (xa <= Year .and. Year < xb) then |
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| 114 | ! Obliquity |
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| 115 | if (var_obl) then |
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| 116 | ya = obllask(ilask) |
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| 117 | yb = obllask(ilask - 1) |
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| 118 | if (ya < yb) then ! Increasing -> max is the limitation |
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| 119 | yc_obl = max_obl |
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| 120 | else ! Decreasing -> min is the limitation |
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| 121 | yc_obl = min_obl |
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| 122 | endif |
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| 123 | endif |
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| 124 | |
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| 125 | ! Eccentricity |
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| 126 | if (var_ecc) then |
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| 127 | ya = ecclask(ilask) |
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| 128 | yb = ecclask(ilask - 1) |
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| 129 | if (ya < yb) then ! Increasing -> max is the limitation |
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| 130 | yc_ecc = max_ecc |
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| 131 | else ! Decreasing -> min is the limitation |
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| 132 | yc_ecc = min_ecc |
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| 133 | endif |
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| 134 | endif |
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| 135 | |
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| 136 | ! Lsp |
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| 137 | if (var_lsp) then |
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| 138 | ya = lsplask(ilask) |
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| 139 | yb = lsplask(ilask - 1) |
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| 140 | if (ya < yb) then ! Increasing -> max is the limitation |
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| 141 | if (yb - ya > 300.) then ! If modulo is "crossed" then it is the other way around |
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| 142 | yc_lsp = min_lsp |
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| 143 | else |
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| 144 | yc_lsp = max_lsp |
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| 145 | endif |
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| 146 | else ! Decreasing -> min is the limitation |
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| 147 | if (ya - yb > 300.) then ! If modulo is "crossed" then it is the other way around |
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| 148 | yc_lsp = max_lsp |
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| 149 | else |
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| 150 | yc_lsp = min_lsp |
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| 151 | endif |
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| 152 | endif |
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| 153 | endif |
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| 154 | iylask = ilask |
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| 155 | exit ! The loop is left as soon as the right interval is found |
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| 156 | endif |
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| 157 | enddo |
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| 158 | |
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| 159 | if (ilask == 1) then |
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| 160 | write(*,*) 'The year does not match with Laskar data in the file obl_ecc_lsp.asc.' |
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| 161 | stop |
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| 162 | endif |
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| 163 | |
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| 164 | ! Linear interpolation gives the maximum reachable year according to the limitation |
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| 165 | ! Obliquity |
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| 166 | if (var_obl) then |
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| 167 | do ilask = iylask,2,-1 |
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| 168 | ya = obllask(ilask) |
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| 169 | yb = obllask(ilask - 1) |
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| 170 | if (min(ya,yb) <= yc_obl .and. yc_obl < max(ya,yb)) then |
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| 171 | xa = yearlask(ilask) |
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| 172 | xb = yearlask(ilask - 1) |
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| 173 | max_obl_iter = floor((yc_obl - ya)*(xb - xa)/(yb - ya) + xa) - Year |
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| 174 | exit ! The loop is left as soon as the right interval is found |
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| 175 | endif |
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| 176 | enddo |
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| 177 | endif |
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| 178 | ! Eccentricity |
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| 179 | if (var_ecc) then |
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| 180 | do ilask = iylask,2,-1 |
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| 181 | ya = ecclask(ilask) |
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| 182 | yb = ecclask(ilask - 1) |
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| 183 | if (min(ya,yb) <= yc_ecc .and. yc_ecc < max(ya,yb)) then |
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| 184 | xa = yearlask(ilask) |
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| 185 | xb = yearlask(ilask - 1) |
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| 186 | max_ecc_iter = floor((yc_ecc - ya)*(xb - xa)/(yb - ya) + xa) - Year |
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| 187 | exit ! The loop is left as soon as the right interval is found |
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| 188 | endif |
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| 189 | enddo |
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| 190 | endif |
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| 191 | ! Lsp |
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| 192 | if (var_lsp) then |
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| 193 | do ilask = iylask,2,-1 |
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| 194 | ya = lsplask(ilask) |
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| 195 | yb = lsplask(ilask - 1) |
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| 196 | if (min(ya,yb) <= yc_lsp .and. yc_lsp < max(ya,yb)) then |
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| 197 | xa = yearlask(ilask) |
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| 198 | xb = yearlask(ilask - 1) |
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| 199 | max_lsp_iter = floor((yc_lsp - ya)*(xb - xa)/(yb - ya) + xa) - Year |
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| 200 | exit ! The loop is left as soon as the right interval is found |
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| 201 | endif |
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| 202 | enddo |
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| 203 | endif |
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| 204 | |
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| 205 | write(*,*) 'Max. number of iterations for the obl. parameter =', max_obl_iter |
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| 206 | write(*,*) 'Max. number of iterations for the ecc. parameter =', max_ecc_iter |
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| 207 | write(*,*) 'Max. number of iterations for the Lsp parameter =', max_lsp_iter |
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| 208 | |
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| 209 | year_iter_max = min(max_obl_iter,max_ecc_iter,max_lsp_iter) |
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| 210 | if (year_iter_max > 0) then |
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| 211 | write(*,*) 'So the max. number of iterations for the orbital criteria =', year_iter_max |
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| 212 | else |
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| 213 | write(*,*) 'The max. number of iterations is not compatible with Laskar data in the file obl_ecc_lsp.asc.' |
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| 214 | stop |
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| 215 | endif |
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| 216 | |
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| 217 | END SUBROUTINE orbit_param_criterion |
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| 218 | |
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| 219 | !******************************************************************************** |
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| 220 | |
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| 221 | END MODULE orbit_param_criterion_mod |
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| 222 | |
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