1 | module fxhyp_m |
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2 | |
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3 | IMPLICIT NONE |
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4 | |
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5 | contains |
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6 | |
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7 | SUBROUTINE fxhyp(xprimm025, rlonv, xprimv, rlonu, xprimu, xprimp025) |
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8 | |
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9 | ! From LMDZ4/libf/dyn3d/fxhyp.F, version 1.2, 2005/06/03 09:11:32 |
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10 | ! Author: P. Le Van, from formulas by R. Sadourny |
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11 | |
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12 | ! Calcule les longitudes et dérivées dans la grille du GCM pour |
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13 | ! une fonction f(x) à dérivée tangente hyperbolique. |
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14 | |
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15 | ! Il vaut mieux avoir : grossismx \times dzoom < pi |
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16 | |
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17 | ! Le premier point scalaire pour une grille regulière (grossismx = |
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18 | ! 1., taux=0., clon=0.) est à - 180 degrés. |
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19 | |
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20 | use arth_m, only: arth |
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21 | use invert_zoom_x_m, only: invert_zoom_x, nmax |
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22 | use nrtype, only: pi, pi_d, twopi, twopi_d, k8 |
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23 | use principal_cshift_m, only: principal_cshift |
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24 | |
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25 | include "dimensions.h" |
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26 | ! for iim |
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27 | |
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28 | include "serre.h" |
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29 | ! for clon, grossismx, dzoomx, taux |
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30 | |
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31 | REAL, intent(out):: xprimm025(:), rlonv(:), xprimv(:) ! (iim + 1) |
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32 | real, intent(out):: rlonu(:), xprimu(:), xprimp025(:) ! (iim + 1) |
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33 | |
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34 | ! Local: |
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35 | real rlonm025(iim + 1), rlonp025(iim + 1) |
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36 | REAL dzoom, step |
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37 | real d_rlonv(iim) |
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38 | REAL(K8) xtild(0:2 * nmax) |
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39 | REAL(K8) fhyp(nmax:2 * nmax), ffdx, beta, Xprimt(0:2 * nmax) |
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40 | REAL(K8) Xf(0:2 * nmax), xxpr(2 * nmax) |
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41 | REAL(K8) fa, fb |
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42 | INTEGER i, is2 |
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43 | REAL(K8) xmoy, fxm |
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44 | |
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45 | !---------------------------------------------------------------------- |
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46 | |
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47 | print *, "Call sequence information: fxhyp" |
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48 | |
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49 | test_iim: if (iim==1) then |
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50 | rlonv(1)=0. |
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51 | rlonu(1)=pi |
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52 | rlonv(2)=rlonv(1)+twopi |
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53 | rlonu(2)=rlonu(1)+twopi |
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54 | |
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55 | xprimm025(:)=1. |
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56 | xprimv(:)=1. |
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57 | xprimu(:)=1. |
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58 | xprimp025(:)=1. |
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59 | else test_iim |
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60 | test_grossismx: if (grossismx == 1.) then |
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61 | step = twopi / iim |
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62 | |
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63 | xprimm025(:iim) = step |
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64 | xprimp025(:iim) = step |
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65 | xprimv(:iim) = step |
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66 | xprimu(:iim) = step |
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67 | |
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68 | rlonv(:iim) = arth(- pi + clon / 180. * pi, step, iim) |
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69 | rlonm025(:iim) = rlonv(:iim) - 0.25 * step |
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70 | rlonp025(:iim) = rlonv(:iim) + 0.25 * step |
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71 | rlonu(:iim) = rlonv(:iim) + 0.5 * step |
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72 | else test_grossismx |
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73 | dzoom = dzoomx * twopi_d |
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74 | xtild = arth(- pi_d, pi_d / nmax, 2 * nmax + 1) |
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75 | |
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76 | ! Compute fhyp: |
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77 | DO i = nmax, 2 * nmax |
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78 | fa = taux * (dzoom / 2. - xtild(i)) |
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79 | fb = xtild(i) * (pi_d - xtild(i)) |
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80 | |
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81 | IF (200. * fb < - fa) THEN |
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82 | fhyp(i) = - 1. |
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83 | ELSE IF (200. * fb < fa) THEN |
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84 | fhyp(i) = 1. |
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85 | ELSE |
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86 | IF (ABS(fa) < 1e-13 .AND. ABS(fb) < 1e-13) THEN |
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87 | IF (200. * fb + fa < 1e-10) THEN |
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88 | fhyp(i) = - 1. |
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89 | ELSE IF (200. * fb - fa < 1e-10) THEN |
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90 | fhyp(i) = 1. |
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91 | END IF |
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92 | ELSE |
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93 | fhyp(i) = TANH(fa / fb) |
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94 | END IF |
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95 | END IF |
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96 | |
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97 | IF (xtild(i) == 0.) fhyp(i) = 1. |
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98 | IF (xtild(i) == pi_d) fhyp(i) = -1. |
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99 | END DO |
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100 | |
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101 | ! Calcul de beta |
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102 | |
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103 | ffdx = 0. |
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104 | |
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105 | DO i = nmax + 1, 2 * nmax |
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106 | xmoy = 0.5 * (xtild(i-1) + xtild(i)) |
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107 | fa = taux * (dzoom / 2. - xmoy) |
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108 | fb = xmoy * (pi_d - xmoy) |
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109 | |
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110 | IF (200. * fb < - fa) THEN |
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111 | fxm = - 1. |
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112 | ELSE IF (200. * fb < fa) THEN |
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113 | fxm = 1. |
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114 | ELSE |
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115 | IF (ABS(fa) < 1e-13 .AND. ABS(fb) < 1e-13) THEN |
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116 | IF (200. * fb + fa < 1e-10) THEN |
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117 | fxm = - 1. |
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118 | ELSE IF (200. * fb - fa < 1e-10) THEN |
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119 | fxm = 1. |
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120 | END IF |
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121 | ELSE |
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122 | fxm = TANH(fa / fb) |
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123 | END IF |
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124 | END IF |
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125 | |
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126 | IF (xmoy == 0.) fxm = 1. |
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127 | IF (xmoy == pi_d) fxm = -1. |
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128 | |
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129 | ffdx = ffdx + fxm * (xtild(i) - xtild(i-1)) |
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130 | END DO |
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131 | |
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132 | print *, "ffdx = ", ffdx |
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133 | beta = (grossismx * ffdx - pi_d) / (ffdx - pi_d) |
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134 | print *, "beta = ", beta |
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135 | |
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136 | IF (2. * beta - grossismx <= 0.) THEN |
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137 | print *, 'Bad choice of grossismx, taux, dzoomx.' |
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138 | print *, 'Decrease dzoomx or grossismx.' |
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139 | STOP 1 |
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140 | END IF |
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141 | |
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142 | ! calcul de Xprimt |
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143 | Xprimt(nmax:2 * nmax) = beta + (grossismx - beta) * fhyp |
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144 | xprimt(:nmax - 1) = xprimt(2 * nmax:nmax + 1:- 1) |
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145 | |
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146 | ! Calcul de Xf |
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147 | |
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148 | DO i = nmax + 1, 2 * nmax |
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149 | xmoy = 0.5 * (xtild(i-1) + xtild(i)) |
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150 | fa = taux * (dzoom / 2. - xmoy) |
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151 | fb = xmoy * (pi_d - xmoy) |
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152 | |
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153 | IF (200. * fb < - fa) THEN |
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154 | fxm = - 1. |
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155 | ELSE IF (200. * fb < fa) THEN |
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156 | fxm = 1. |
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157 | ELSE |
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158 | fxm = TANH(fa / fb) |
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159 | END IF |
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160 | |
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161 | IF (xmoy == 0.) fxm = 1. |
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162 | IF (xmoy == pi_d) fxm = -1. |
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163 | xxpr(i) = beta + (grossismx - beta) * fxm |
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164 | END DO |
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165 | |
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166 | xxpr(:nmax) = xxpr(2 * nmax:nmax + 1:- 1) |
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167 | |
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168 | Xf(0) = - pi_d |
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169 | |
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170 | DO i=1, 2 * nmax - 1 |
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171 | Xf(i) = Xf(i-1) + xxpr(i) * (xtild(i) - xtild(i-1)) |
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172 | END DO |
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173 | |
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174 | Xf(2 * nmax) = pi_d |
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175 | |
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176 | call invert_zoom_x(xf, xtild, Xprimt, rlonm025(:iim), & |
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177 | xprimm025(:iim), xuv = - 0.25_k8) |
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178 | call invert_zoom_x(xf, xtild, Xprimt, rlonv(:iim), xprimv(:iim), & |
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179 | xuv = 0._k8) |
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180 | call invert_zoom_x(xf, xtild, Xprimt, rlonu(:iim), xprimu(:iim), & |
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181 | xuv = 0.5_k8) |
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182 | call invert_zoom_x(xf, xtild, Xprimt, rlonp025(:iim), & |
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183 | xprimp025(:iim), xuv = 0.25_k8) |
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184 | end if test_grossismx |
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185 | |
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186 | is2 = 0 |
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187 | |
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188 | IF (MINval(rlonm025(:iim)) < - pi - 0.1 & |
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189 | .or. MAXval(rlonm025(:iim)) > pi + 0.1) THEN |
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190 | IF (clon <= 0.) THEN |
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191 | is2 = 1 |
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192 | |
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193 | do while (rlonm025(is2) < - pi .and. is2 < iim) |
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194 | is2 = is2 + 1 |
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195 | end do |
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196 | |
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197 | if (rlonm025(is2) < - pi) then |
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198 | print *, 'Rlonm025 plus petit que - pi !' |
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199 | STOP 1 |
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200 | end if |
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201 | ELSE |
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202 | is2 = iim |
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203 | |
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204 | do while (rlonm025(is2) > pi .and. is2 > 1) |
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205 | is2 = is2 - 1 |
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206 | end do |
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207 | |
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208 | if (rlonm025(is2) > pi) then |
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209 | print *, 'Rlonm025 plus grand que pi !' |
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210 | STOP 1 |
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211 | end if |
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212 | END IF |
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213 | END IF |
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214 | |
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215 | call principal_cshift(is2, rlonm025, xprimm025) |
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216 | call principal_cshift(is2, rlonv, xprimv) |
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217 | call principal_cshift(is2, rlonu, xprimu) |
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218 | call principal_cshift(is2, rlonp025, xprimp025) |
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219 | |
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220 | forall (i = 1: iim) d_rlonv(i) = rlonv(i + 1) - rlonv(i) |
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221 | print *, "Minimum longitude step:", MINval(d_rlonv) * 180. / pi, & |
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222 | "degrees" |
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223 | print *, "Maximum longitude step:", MAXval(d_rlonv) * 180. / pi, & |
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224 | "degrees" |
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225 | |
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226 | ! Check that rlonm025 <= rlonv <= rlonp025 <= rlonu: |
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227 | DO i = 1, iim + 1 |
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228 | IF (rlonp025(i) < rlonv(i)) THEN |
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229 | print *, 'rlonp025(', i, ') = ', rlonp025(i) |
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230 | print *, "< rlonv(", i, ") = ", rlonv(i) |
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231 | STOP 1 |
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232 | END IF |
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233 | |
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234 | IF (rlonv(i) < rlonm025(i)) THEN |
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235 | print *, 'rlonv(', i, ') = ', rlonv(i) |
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236 | print *, "< rlonm025(", i, ") = ", rlonm025(i) |
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237 | STOP 1 |
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238 | END IF |
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239 | |
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240 | IF (rlonp025(i) > rlonu(i)) THEN |
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241 | print *, 'rlonp025(', i, ') = ', rlonp025(i) |
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242 | print *, "> rlonu(", i, ") = ", rlonu(i) |
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243 | STOP 1 |
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244 | END IF |
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245 | END DO |
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246 | end if test_iim |
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247 | |
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248 | END SUBROUTINE fxhyp |
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249 | |
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250 | end module fxhyp_m |
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