1 | MODULE nudging_mod |
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2 | USE icosa, ONLY : rstd |
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3 | USE grid_param, ONLY : llm, nqdyn |
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4 | USE omp_para, ONLY : ll_begin, ll_end |
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5 | USE domain_mod, ONLY : ndomain, assigned_domain |
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6 | USE dimensions, ONLY : swap_dimensions, u_right, u_lup, u_ldown |
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7 | USE dimensions, ONLY : iim, jjm, ij_begin_ext, ij_end_ext |
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8 | USE geometry, ONLY : swap_geometry |
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9 | USE field_mod |
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10 | IMPLICIT NONE |
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11 | SAVE |
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12 | PRIVATE |
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13 | ! nudging will be active outside a disc of radius 'radius' centered at 'center_lon', 'center lat'. |
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14 | REAL(rstd) :: center_lon, center_lat, nudging_radius, time |
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15 | !$OMP THREADPRIVATE(center_lon, center_lat, nudging_radius, time) |
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16 | |
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17 | TYPE(t_field),POINTER :: f_relax_coef_e(:), f_target_ue(:), & |
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18 | f_relax_coef_i(:), f_target_theta_rhodz(:) |
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19 | |
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20 | PUBLIC :: init_guided, guided |
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21 | |
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22 | CONTAINS |
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23 | |
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24 | SUBROUTINE init_guided(f_u,f_theta_rhodz) |
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25 | USE getin_mod, ONLY : getin |
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26 | USE math_const, ONLY : pi |
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27 | USE earth_const, ONLY : scale_factor |
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28 | TYPE(t_field),POINTER :: f_u(:)! initial condition |
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29 | TYPE(t_field),POINTER :: f_theta_rhodz(:)! initial condition |
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30 | REAL(rstd), POINTER :: ue(:,:), target_ue(:,:), coef_e(:) |
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31 | REAL(rstd), POINTER :: theta_rhodz(:,:,:), target_theta_rhodz(:,:,:), coef_i(:) |
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32 | INTEGER :: ind |
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33 | ! read DEF keys describing how to relax |
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34 | center_lon=0. |
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35 | CALL getin('nudging_center_lon', center_lon) |
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36 | center_lat=0. |
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37 | CALL getin('nudging_center_lat', center_lat) |
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38 | nudging_radius=0. |
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39 | CALL getin('nudging_radius', nudging_radius) |
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40 | nudging_radius = nudging_radius / scale_factor |
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41 | ! time=0. |
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42 | ! CALL getin('nudging_time', time) |
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43 | |
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44 | ! we should check that radius>0 |
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45 | |
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46 | !SELECT CASE(TRIM(nudg_name)) |
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47 | ! CASE ('f_u') |
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48 | CALL allocate_field(f_relax_coef_e, field_u, type_real, name='nudging_coef_e') |
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49 | CALL allocate_field(f_target_ue, field_u, type_real, llm, name='nudging_target_e') |
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50 | ! CASE ('f_theta_rhodz') |
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51 | CALL allocate_field(f_relax_coef_i, field_t, type_real, name='nudging_coef_i') |
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52 | CALL allocate_field(f_target_theta_rhodz, field_t, type_real, llm,nqdyn, name='nudging_target_theta') |
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53 | ! CASE DEFAULT |
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54 | !END SELECT |
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55 | |
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56 | ! compute relax_coef and target_ue |
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57 | center_lon = center_lon * pi/180. |
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58 | center_lat = center_lat * pi/180. |
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59 | DO ind = 1 , ndomain |
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60 | IF (.NOT. assigned_domain(ind)) CYCLE |
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61 | CALL swap_dimensions(ind) |
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62 | CALL swap_geometry(ind) |
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63 | coef_e = f_relax_coef_e(ind) |
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64 | coef_i = f_relax_coef_i(ind) |
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65 | target_ue = f_target_ue(ind) |
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66 | ue = f_u(ind) |
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67 | target_theta_rhodz = f_target_theta_rhodz(ind) |
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68 | theta_rhodz = f_theta_rhodz(ind) |
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69 | CALL compute_relax_coef(coef_e, coef_i) |
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70 | CALL compute_target_u(ue, target_ue) |
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71 | CALL compute_target_center(theta_rhodz, target_theta_rhodz) |
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72 | END DO |
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73 | END SUBROUTINE init_guided |
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74 | |
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75 | !----------------------------- Compute relaxation coefficients ------------------------------ |
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76 | |
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77 | SUBROUTINE compute_relax_coef(coef_e, coef_i) |
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78 | USE geometry, ONLY : lon_e, lat_e, lon_i, lat_i |
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79 | REAL(rstd), INTENT(OUT) :: coef_e(iim*3*jjm), coef_i(iim*jjm) |
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80 | INTEGER :: l, ij |
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81 | DO ij=ij_begin_ext, ij_end_ext |
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82 | coef_e(ij+u_right) = relax_coef(lon_e(ij+u_right), lat_e(ij+u_right) ) |
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83 | coef_e(ij+u_lup) = relax_coef(lon_e(ij+u_lup), lat_e(ij+u_lup) ) |
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84 | coef_e(ij+u_ldown) = relax_coef(lon_e(ij+u_ldown), lat_e(ij+u_ldown) ) |
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85 | coef_i(ij) = relax_coef(lon_i(ij), lat_i(ij) ) |
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86 | END DO |
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87 | END SUBROUTINE compute_relax_coef |
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88 | |
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89 | FUNCTION relax_coef(lon,lat) |
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90 | USE spherical_geom_mod, ONLY : dist_lonlat |
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91 | REAL(rstd), INTENT(IN) :: lon,lat |
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92 | REAL(rstd) :: relax_coef, dist, c |
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93 | ! NB : dist is computed on unit sphere |
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94 | CALL dist_lonlat(lon, lat, center_lon, center_lat, dist) |
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95 | c = tanh((1.-radius*dist/nudging_radius)*20.) ! 1 inside circle, -1 outside |
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96 | relax_coef = .5*(1.+c) ! rescale to [0,1] range ; ! 1 inside circle, 0 outside |
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97 | END FUNCTION relax_coef |
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98 | |
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99 | !----------------------------- Copy initial condition as target ------------------------------ |
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100 | |
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101 | SUBROUTINE compute_target_u(ue, target_ue) |
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102 | REAL(rstd), INTENT(OUT) :: target_ue(iim*3*jjm,llm) |
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103 | REAL(rstd), INTENT(IN) :: ue(iim*3*jjm,llm) |
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104 | INTEGER :: l, ij |
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105 | DO l = ll_begin, ll_end |
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106 | DO ij=ij_begin_ext, ij_end_ext |
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107 | target_ue(ij+u_right,l)=ue(ij+u_right,l) |
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108 | target_ue(ij+u_lup,l)=ue(ij+u_lup,l) |
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109 | target_ue(ij+u_ldown,l)=ue(ij+u_ldown,l) |
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110 | END DO |
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111 | END DO |
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112 | END SUBROUTINE compute_target_u |
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113 | |
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114 | SUBROUTINE compute_target_center(theta_rhodz, target_theta_rhodz) |
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115 | REAL(rstd), INTENT(OUT) :: target_theta_rhodz(iim*jjm,llm,nqdyn) |
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116 | REAL(rstd), INTENT(IN) :: theta_rhodz(iim*jjm,llm,nqdyn) |
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117 | INTEGER :: l, ij, iq |
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118 | DO iq=1, nqdyn |
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119 | DO l = ll_begin, ll_end |
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120 | DO ij=ij_begin_ext, ij_end_ext |
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121 | target_theta_rhodz(ij,l,iq)=theta_rhodz(ij,l,iq) |
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122 | END DO |
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123 | END DO |
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124 | END DO |
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125 | END SUBROUTINE compute_target_center |
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126 | |
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127 | !----------------------------- Relax towards target ------------------------------ |
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128 | |
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129 | SUBROUTINE guided(tt, f_ps, f_theta_rhodz, f_u, f_q) |
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130 | REAL(rstd), INTENT(IN):: tt |
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131 | TYPE(t_field),POINTER :: f_ps(:) |
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132 | TYPE(t_field),POINTER :: f_phis(:) |
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133 | TYPE(t_field),POINTER :: f_theta_rhodz(:) |
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134 | TYPE(t_field),POINTER :: f_u(:) |
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135 | TYPE(t_field),POINTER :: f_q(:) |
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136 | REAL(rstd), POINTER :: target_ue(:,:), ue(:,:), coef_e(:) |
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137 | REAL(rstd), POINTER :: target_theta_rhodz(:,:,:), theta_rhodz(:,:,:), coef_i(:) |
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138 | INTEGER :: ind |
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139 | |
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140 | DO ind = 1 , ndomain |
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141 | IF (.NOT. assigned_domain(ind)) CYCLE |
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142 | CALL swap_dimensions(ind) |
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143 | CALL swap_geometry(ind) |
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144 | coef_e = f_relax_coef_e(ind) |
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145 | target_ue = f_target_ue(ind) |
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146 | ue = f_u(ind) |
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147 | CALL compute_guided_u(coef_e, target_ue, ue) |
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148 | coef_i = f_relax_coef_i(ind) |
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149 | target_theta_rhodz = f_target_theta_rhodz(ind) |
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150 | theta_rhodz = f_theta_rhodz(ind) |
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151 | CALL compute_guided_center(coef_i, target_theta_rhodz, theta_rhodz) |
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152 | END DO |
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153 | |
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154 | END SUBROUTINE guided |
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155 | |
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156 | SUBROUTINE compute_guided_u(coef_e, target_ue, ue) |
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157 | REAL(rstd), INTENT(IN) :: coef_e(iim*3*jjm) |
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158 | REAL(rstd), INTENT(IN) :: target_ue(iim*3*jjm,llm) |
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159 | REAL(rstd), INTENT(INOUT) :: ue(iim*3*jjm,llm) |
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160 | INTEGER :: l, ij |
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161 | DO l = ll_begin, ll_end |
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162 | DO ij=ij_begin_ext, ij_end_ext |
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163 | ue(ij+u_right,l) = ue(ij+u_right,l)*coef_e(ij+u_right) + & |
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164 | target_ue(ij+u_right,l)*(1.-coef_e(ij+u_right)) |
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165 | ue(ij+u_lup,l) = ue(ij+u_lup,l)*coef_e(ij+u_lup) + & |
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166 | target_ue(ij+u_lup,l)*(1.-coef_e(ij+u_lup)) |
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167 | ue(ij+u_ldown,l) = ue(ij+u_ldown,l)*coef_e(ij+u_ldown) + & |
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168 | target_ue(ij+u_ldown,l)*(1.-coef_e(ij+u_ldown)) |
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169 | END DO |
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170 | END DO |
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171 | END SUBROUTINE compute_guided_u |
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172 | |
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173 | SUBROUTINE compute_guided_center(coef_i, target_theta_rhodz, theta_rhodz) |
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174 | REAL(rstd), INTENT(IN) :: coef_i(iim*jjm) |
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175 | REAL(rstd), INTENT(IN) :: target_theta_rhodz(iim*jjm,llm,nqdyn) |
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176 | REAL(rstd), INTENT(INOUT) :: theta_rhodz(iim*jjm,llm,nqdyn) |
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177 | INTEGER :: l, ij, iq |
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178 | DO iq=1, nqdyn |
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179 | DO l = ll_begin, ll_end |
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180 | DO ij=ij_begin_ext, ij_end_ext |
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181 | theta_rhodz(ij,l,iq) = theta_rhodz(ij,l,iq)*coef_i(ij) + & |
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182 | target_theta_rhodz(ij,l,iq)*(1.-coef_i(ij)) |
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183 | END DO |
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184 | END DO |
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185 | END DO |
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186 | END SUBROUTINE compute_guided_center |
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187 | |
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188 | END MODULE nudging_mod |
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