[12] | 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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[19] | 6 | USE icosa |
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[12] | 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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[19] | 32 | USE icosa |
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[12] | 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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[50] | 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 | !$OMP DO |
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| 50 | DO j=jj_begin-offset,jj_end+offset |
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| 51 | DO i=ii_begin-offset,ii_end+offset |
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| 52 | ij=(j-1)*iim+i |
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| 53 | alpha(ij,llm) = 0. |
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| 54 | beta (ij,llm) = 1./ (1+ 2*kappa) |
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| 55 | ENDDO |
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[12] | 56 | ENDDO |
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[50] | 57 | |
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| 58 | ! for other layer |
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| 59 | DO l = llm-1 , 2 , -1 |
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| 60 | !$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 | !$OMP DO |
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[12] | 75 | DO j=jj_begin-offset,jj_end+offset |
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[50] | 76 | DO i=ii_begin-offset,ii_end+offset |
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| 77 | ij=(j-1)*iim+i |
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| 78 | pks(ij) = cpp * ( ps(ij)/preff ) ** kappa |
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| 79 | pk(ij,1) = ( p(ij,1)*pks(ij) - 0.5*alpha(ij,2)*p(ij,2) ) / & |
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| 80 | ( p(ij,1)* (1.+kappa) + 0.5*( beta(ij,2)-(1.+2*kappa) )* p(ij,2) ) |
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| 81 | ENDDO |
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[12] | 82 | ENDDO |
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[50] | 83 | |
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| 84 | ! for other layers |
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| 85 | |
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| 86 | DO l = 2, llm |
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| 87 | !$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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[12] | 94 | ENDDO |
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[50] | 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 | !$OMP DO |
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[12] | 99 | DO j=jj_begin-offset,jj_end+offset |
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[50] | 100 | DO i=ii_begin-offset,ii_end+offset |
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| 101 | ij=(j-1)*iim+i |
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| 102 | pks(ij) = cpp * ( ps(ij)/preff ) ** kappa |
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| 103 | ENDDO |
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[12] | 104 | ENDDO |
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[50] | 105 | |
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| 106 | ! 3D : pk |
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| 107 | DO l = 1, llm |
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| 108 | !$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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[12] | 117 | |
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| 118 | END SUBROUTINE compute_exner |
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[50] | 119 | |
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[12] | 120 | END MODULE exner_mod |
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