| 1 | SUBROUTINE flumass(massebx,masseby, vcont, ucont, pbaru, pbarv ) |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------- |
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| 4 | ! Authors: P. Le Van , Fr. Hourdin. |
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| 5 | !------------------------------------------------------------------------------- |
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| 6 | ! Purpose: Compute mass flux at s levels. |
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| 7 | USE lmdz_comgeom |
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| 8 | |
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| 9 | USE lmdz_dimensions, ONLY: iim, jjm, llm, ndm |
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| 10 | USE lmdz_paramet |
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| 11 | IMPLICIT NONE |
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| 12 | |
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| 13 | |
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| 14 | !=============================================================================== |
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| 15 | ! Arguments: |
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| 16 | REAL, INTENT(IN) :: massebx(ip1jmp1,llm) |
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| 17 | REAL, INTENT(IN) :: masseby(ip1jm ,llm) |
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| 18 | REAL, INTENT(IN) :: vcont (ip1jm ,llm) |
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| 19 | REAL, INTENT(IN) :: ucont (ip1jmp1,llm) |
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| 20 | REAL, INTENT(OUT) :: pbaru (ip1jmp1,llm) |
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| 21 | REAL, INTENT(OUT) :: pbarv (ip1jm ,llm) |
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| 22 | !=============================================================================== |
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| 23 | ! Method used: A 2 equations system is solved. |
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| 24 | ! * 1st one describes divergence computation at pole point nr. i (i=1 to im): |
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| 25 | ! (0.5*(pbaru(i)-pbaru(i-1))-pbarv(i))/aire(i) = - SUM(pbarv(n))/aire pole |
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| 26 | ! * 2nd one specifies that mean mass flux at pole is equal to 0: |
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| 27 | ! SUM(pbaru(n)*local_area(n))=0 |
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| 28 | ! This way, we determine additive constant common to pbary elements representing |
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| 29 | ! pbaru(0,j,l) in divergence computation equation for point i=1. (i=1 to im) |
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| 30 | !=============================================================================== |
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| 31 | ! Local variables: |
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| 32 | REAL :: sairen, saireun, ctn, ctn0, apbarun(iip1) |
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| 33 | REAL :: saires, saireus, cts, cts0, apbarus(iip1) |
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| 34 | INTEGER :: l, i |
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| 35 | !=============================================================================== |
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| 36 | DO l=1,llm |
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| 37 | pbaru(iip2:ip1jm,l)=massebx(iip2:ip1jm,l)*ucont(iip2:ip1jm,l) |
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| 38 | pbarv( 1:ip1jm,l)=masseby( 1:ip1jm,l)*vcont( 1:ip1jm,l) |
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| 39 | END DO |
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| 40 | |
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| 41 | !--- NORTH POLE |
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| 42 | sairen =SUM(aire (1:iim)) |
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| 43 | saireun=SUM(aireu(1:iim)) |
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| 44 | DO l = 1,llm |
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| 45 | ctn=SUM(pbarv(1:iim,l))/sairen |
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| 46 | pbaru(1,l)= pbarv(1,l)-ctn*aire(1) |
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| 47 | DO i=2,iim |
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| 48 | pbaru(i,l)=pbaru(i-1,l)+pbarv(i,l)-ctn*aire(i) |
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| 49 | END DO |
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| 50 | DO i=1,iim |
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| 51 | apbarun(i)=aireu(i)*pbaru(i,l) |
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| 52 | END DO |
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| 53 | ctn0 = -SUM(apbarun(1:iim))/saireun |
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| 54 | DO i = 1,iim |
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| 55 | pbaru(i,l)=2.*(pbaru(i,l)+ctn0) |
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| 56 | END DO |
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| 57 | pbaru(iip1,l)=pbaru(1,l) |
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| 58 | END DO |
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| 59 | |
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| 60 | !--- SOUTH POLE |
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| 61 | saires =SUM(aire (ip1jm+1:ip1jmp1-1)) |
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| 62 | saireus=SUM(aireu(ip1jm+1:ip1jmp1-1)) |
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| 63 | DO l = 1,llm |
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| 64 | cts=SUM(pbarv(ip1jmi1+1:ip1jm-1,l))/saires |
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| 65 | pbaru(1+ip1jm,l)=-pbarv(1+ip1jmi1,l)+cts*aire(1+ip1jm) |
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| 66 | DO i=2,iim |
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| 67 | pbaru(i+ip1jm,l)=pbaru(i-1+ip1jm,l)-pbarv(i+ip1jmi1,l)+cts*aire(i+ip1jm) |
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| 68 | END DO |
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| 69 | DO i=1,iim |
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| 70 | apbarus(i)=aireu(i+ip1jm)*pbaru(i+ip1jm,l) |
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| 71 | END DO |
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| 72 | cts0 = -SUM(apbarus(1:iim))/saireus |
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| 73 | DO i = 1,iim |
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| 74 | pbaru(i+ip1jm,l)=2.*(pbaru(i+ip1jm,l)+cts0) |
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| 75 | END DO |
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| 76 | pbaru(ip1jmp1,l)=pbaru(1+ip1jm,l) |
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| 77 | END DO |
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| 78 | |
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| 79 | END SUBROUTINE flumass |
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