1 | MODULE exner_mod |
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2 | |
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3 | CONTAINS |
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4 | |
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5 | SUBROUTINE exner(f_ps,f_p,f_pks,f_pk) |
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6 | USE icosa |
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7 | IMPLICIT NONE |
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8 | TYPE(t_field), POINTER :: f_ps(:) |
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9 | TYPE(t_field), POINTER :: f_p(:) |
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10 | TYPE(t_field), POINTER :: f_pks(:) |
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11 | TYPE(t_field), POINTER :: f_pk(:) |
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12 | |
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13 | REAL(rstd), POINTER :: ps(:) |
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14 | REAL(rstd), POINTER :: p(:,:) |
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15 | REAL(rstd), POINTER :: pks(:) |
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16 | REAL(rstd), POINTER :: pk(:,:) |
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17 | INTEGER :: ind |
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18 | |
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19 | DO ind=1,ndomain |
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20 | CALL swap_dimensions(ind) |
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21 | CALL swap_geometry(ind) |
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22 | ps=f_ps(ind) |
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23 | p=f_p(ind) |
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24 | pks=f_pks(ind) |
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25 | pk=f_pk(ind) |
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26 | CALL compute_exner(ps, p, pks, pk, 0) |
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27 | ENDDO |
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28 | |
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29 | END SUBROUTINE exner |
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30 | |
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31 | SUBROUTINE compute_exner(ps,p,pks,pk,offset) |
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32 | USE icosa |
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33 | USE disvert_mod |
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34 | USE pression_mod |
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35 | IMPLICIT NONE |
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36 | REAL(rstd),INTENT(IN) :: ps(iim*jjm) |
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37 | REAL(rstd),INTENT(IN) :: p(iim*jjm,llm+1) |
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38 | REAL(rstd),INTENT(OUT) :: pks(iim*jjm) |
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39 | REAL(rstd),INTENT(OUT) :: pk(iim*jjm,llm) |
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40 | INTEGER,INTENT(IN) :: offset |
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41 | INTEGER :: i,j,ij,l |
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42 | REAL(rstd) :: alpha(iim*jjm,llm),beta(iim*jjm,llm) |
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43 | REAL(rstd) :: delta |
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44 | |
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45 | IF(.FALSE.) THEN ! LMD-Z style calculation of Exner pressure |
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46 | !! Compute Alpha and Beta |
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47 | |
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48 | ! for llm layer |
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49 | !$OMP DO |
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50 | DO j=jj_begin-offset,jj_end+offset |
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51 | DO i=ii_begin-offset,ii_end+offset |
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52 | ij=(j-1)*iim+i |
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53 | alpha(ij,llm) = 0. |
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54 | beta (ij,llm) = 1./ (1+ 2*kappa) |
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55 | ENDDO |
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56 | ENDDO |
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57 | |
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58 | ! for other layer |
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59 | DO l = llm-1 , 2 , -1 |
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60 | !$OMP DO |
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61 | DO j=jj_begin-offset,jj_end+offset |
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62 | DO i=ii_begin-offset,ii_end+offset |
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63 | ij=(j-1)*iim+i |
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64 | delta = p(ij,l)* (1+2*kappa) + p(ij,l+1)* ( beta(ij,l+1)- (1+2*kappa) ) |
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65 | alpha(ij,l) = - p(ij,l+1) / delta * alpha(ij,l+1) |
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66 | beta (ij,l) = p(ij,l ) / delta |
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67 | ENDDO |
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68 | ENDDO |
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69 | ENDDO |
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70 | |
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71 | !! Compute pk |
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72 | |
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73 | ! for first layer |
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74 | !$OMP DO |
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75 | DO j=jj_begin-offset,jj_end+offset |
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76 | DO i=ii_begin-offset,ii_end+offset |
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77 | ij=(j-1)*iim+i |
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78 | pks(ij) = cpp * ( ps(ij)/preff ) ** kappa |
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79 | pk(ij,1) = ( p(ij,1)*pks(ij) - 0.5*alpha(ij,2)*p(ij,2) ) / & |
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80 | ( p(ij,1)* (1.+kappa) + 0.5*( beta(ij,2)-(1.+2*kappa) )* p(ij,2) ) |
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81 | ENDDO |
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82 | ENDDO |
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83 | |
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84 | ! for other layers |
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85 | |
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86 | DO l = 2, llm |
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87 | !$OMP DO |
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88 | DO j=jj_begin-offset,jj_end+offset |
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89 | DO i=ii_begin-offset,ii_end+offset |
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90 | ij=(j-1)*iim+i |
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91 | pk(ij,l) = alpha(ij,l) + beta(ij,l) * pk(ij,l-1) |
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92 | ENDDO |
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93 | ENDDO |
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94 | ENDDO |
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95 | |
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96 | ELSE ! Simple calculation of Exner pressure based on centered average |
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97 | ! surface : pks |
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98 | !$OMP DO |
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99 | DO j=jj_begin-offset,jj_end+offset |
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100 | DO i=ii_begin-offset,ii_end+offset |
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101 | ij=(j-1)*iim+i |
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102 | pks(ij) = cpp * ( ps(ij)/preff ) ** kappa |
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103 | ENDDO |
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104 | ENDDO |
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105 | |
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106 | ! 3D : pk |
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107 | DO l = 1, llm |
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108 | !$OMP DO |
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109 | DO j=jj_begin-offset,jj_end+offset |
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110 | DO i=ii_begin-offset,ii_end+offset |
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111 | ij=(j-1)*iim+i |
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112 | pk(ij,l) = cpp * ((.5/preff)*(p(ij,l)+p(ij,l+1))) ** kappa |
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113 | ENDDO |
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114 | ENDDO |
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115 | ENDDO |
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116 | END IF |
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117 | |
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118 | END SUBROUTINE compute_exner |
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119 | |
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120 | END MODULE exner_mod |
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