[12] | 1 | MODULE exner_mod |
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| 2 | |
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[121] | 3 | INTEGER :: caldyn_exner |
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[133] | 4 | INTEGER, PARAMETER :: lmdz=3, direct=4 |
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[121] | 5 | |
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[12] | 6 | CONTAINS |
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[121] | 7 | |
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[12] | 8 | SUBROUTINE exner(f_ps,f_p,f_pks,f_pk) |
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[19] | 9 | USE icosa |
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[12] | 10 | IMPLICIT NONE |
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| 11 | TYPE(t_field), POINTER :: f_ps(:) |
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| 12 | TYPE(t_field), POINTER :: f_p(:) |
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| 13 | TYPE(t_field), POINTER :: f_pks(:) |
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| 14 | TYPE(t_field), POINTER :: f_pk(:) |
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| 15 | |
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| 16 | REAL(rstd), POINTER :: ps(:) |
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| 17 | REAL(rstd), POINTER :: p(:,:) |
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| 18 | REAL(rstd), POINTER :: pks(:) |
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| 19 | REAL(rstd), POINTER :: pk(:,:) |
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| 20 | INTEGER :: ind |
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| 21 | |
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| 22 | DO ind=1,ndomain |
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| 23 | CALL swap_dimensions(ind) |
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| 24 | CALL swap_geometry(ind) |
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| 25 | ps=f_ps(ind) |
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| 26 | p=f_p(ind) |
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| 27 | pks=f_pks(ind) |
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| 28 | pk=f_pk(ind) |
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| 29 | CALL compute_exner(ps, p, pks, pk, 0) |
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| 30 | ENDDO |
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| 31 | |
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| 32 | END SUBROUTINE exner |
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| 33 | |
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| 34 | SUBROUTINE compute_exner(ps,p,pks,pk,offset) |
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[19] | 35 | USE icosa |
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[12] | 36 | USE disvert_mod |
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| 37 | USE pression_mod |
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| 38 | IMPLICIT NONE |
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| 39 | REAL(rstd),INTENT(IN) :: ps(iim*jjm) |
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| 40 | REAL(rstd),INTENT(IN) :: p(iim*jjm,llm+1) |
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| 41 | REAL(rstd),INTENT(OUT) :: pks(iim*jjm) |
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| 42 | REAL(rstd),INTENT(OUT) :: pk(iim*jjm,llm) |
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| 43 | INTEGER,INTENT(IN) :: offset |
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| 44 | INTEGER :: i,j,ij,l |
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| 45 | REAL(rstd) :: alpha(iim*jjm,llm),beta(iim*jjm,llm) |
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| 46 | REAL(rstd) :: delta |
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| 47 | |
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[133] | 48 | IF(caldyn_exner == lmdz) THEN ! LMD-Z style calculation of Exner pressure |
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[50] | 49 | !! Compute Alpha and Beta |
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| 50 | |
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| 51 | ! for llm layer |
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| 52 | DO j=jj_begin-offset,jj_end+offset |
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| 53 | DO i=ii_begin-offset,ii_end+offset |
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| 54 | ij=(j-1)*iim+i |
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| 55 | alpha(ij,llm) = 0. |
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| 56 | beta (ij,llm) = 1./ (1+ 2*kappa) |
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| 57 | ENDDO |
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[12] | 58 | ENDDO |
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[50] | 59 | |
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| 60 | ! for other layer |
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| 61 | DO l = llm-1 , 2 , -1 |
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| 62 | DO j=jj_begin-offset,jj_end+offset |
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| 63 | DO i=ii_begin-offset,ii_end+offset |
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| 64 | ij=(j-1)*iim+i |
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| 65 | delta = p(ij,l)* (1+2*kappa) + p(ij,l+1)* ( beta(ij,l+1)- (1+2*kappa) ) |
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| 66 | alpha(ij,l) = - p(ij,l+1) / delta * alpha(ij,l+1) |
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| 67 | beta (ij,l) = p(ij,l ) / delta |
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| 68 | ENDDO |
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| 69 | ENDDO |
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| 70 | ENDDO |
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| 71 | |
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| 72 | !! Compute pk |
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| 73 | |
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| 74 | ! for first layer |
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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 | DO j=jj_begin-offset,jj_end+offset |
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| 88 | DO i=ii_begin-offset,ii_end+offset |
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| 89 | ij=(j-1)*iim+i |
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| 90 | pk(ij,l) = alpha(ij,l) + beta(ij,l) * pk(ij,l-1) |
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| 91 | ENDDO |
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| 92 | ENDDO |
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[12] | 93 | ENDDO |
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[50] | 94 | |
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| 95 | ELSE ! Simple calculation of Exner pressure based on centered average |
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| 96 | ! surface : pks |
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[12] | 97 | DO j=jj_begin-offset,jj_end+offset |
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[50] | 98 | DO i=ii_begin-offset,ii_end+offset |
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| 99 | ij=(j-1)*iim+i |
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| 100 | pks(ij) = cpp * ( ps(ij)/preff ) ** kappa |
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| 101 | ENDDO |
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[12] | 102 | ENDDO |
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[50] | 103 | |
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| 104 | ! 3D : pk |
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| 105 | DO l = 1, llm |
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| 106 | DO j=jj_begin-offset,jj_end+offset |
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| 107 | DO i=ii_begin-offset,ii_end+offset |
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| 108 | ij=(j-1)*iim+i |
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| 109 | pk(ij,l) = cpp * ((.5/preff)*(p(ij,l)+p(ij,l+1))) ** kappa |
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| 110 | ENDDO |
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| 111 | ENDDO |
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| 112 | ENDDO |
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| 113 | END IF |
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[12] | 114 | |
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| 115 | END SUBROUTINE compute_exner |
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[50] | 116 | |
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[12] | 117 | END MODULE exner_mod |
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