| [787] | 1 | subroutine totalcloudfrac(ngrid,nq,rneb,totalrneb,pplev,pq,tau) |
|---|
| [253] | 2 | |
|---|
| [728] | 3 | use watercommon_h |
|---|
| [787] | 4 | use comdiurn_h |
|---|
| 5 | USE comgeomfi_h |
|---|
| [858] | 6 | USE tracer_h, only: igcm_h2o_ice |
|---|
| [253] | 7 | implicit none |
|---|
| 8 | |
|---|
| 9 | !================================================================== |
|---|
| 10 | ! |
|---|
| 11 | ! Purpose |
|---|
| 12 | ! ------- |
|---|
| 13 | ! Calculates the total cloud fraction |
|---|
| 14 | ! |
|---|
| 15 | ! Authors |
|---|
| 16 | ! ------- |
|---|
| 17 | ! Adapted from the LMDTERRE code by B Charnay (2010) |
|---|
| 18 | ! |
|---|
| 19 | !================================================================== |
|---|
| 20 | |
|---|
| 21 | #include "dimensions.h" |
|---|
| 22 | #include "dimphys.h" |
|---|
| 23 | #include "comcstfi.h" |
|---|
| [728] | 24 | #include "callkeys.h" |
|---|
| [253] | 25 | |
|---|
| [858] | 26 | integer,intent(in) :: ngrid ! number of atmospheric columns |
|---|
| 27 | integer,intent(in) :: nq ! number of tracers |
|---|
| 28 | real,intent(in) :: rneb(ngrid,nlayermx) ! cloud fraction |
|---|
| 29 | real,intent(out) :: totalrneb(ngrid) ! total cloud fraction |
|---|
| 30 | real,intent(in) :: pplev(ngrid,nlayermx+1) ! inter-layer pressure (Pa) |
|---|
| 31 | real,intent(in) :: pq(ngrid,nlayermx,nq) ! tracers (.../kg_of_air) |
|---|
| 32 | real,intent(in) :: tau(ngrid,nlayermx) |
|---|
| [728] | 33 | |
|---|
| 34 | real, dimension(nlayermx+1) :: masse |
|---|
| 35 | integer, parameter :: recovery=7 |
|---|
| 36 | integer ltau_max |
|---|
| 37 | real massetot |
|---|
| [253] | 38 | |
|---|
| 39 | ! hypothesis behind recovery. value: |
|---|
| 40 | ! 1 = random recovery |
|---|
| 41 | ! 2 = maximal recovery |
|---|
| 42 | ! 3 = minimal recovery |
|---|
| [728] | 43 | ! 4 = fixed recovery |
|---|
| 44 | ! 5 = recovery on the thicker layer |
|---|
| [253] | 45 | ! Local variables |
|---|
| 46 | integer ig, l |
|---|
| [728] | 47 | real clear,tau_min |
|---|
| 48 | real, parameter :: tau_c=0.1 !threshold of optical depth for the calculation of total cloud fraction |
|---|
| 49 | real rneb2(nlayermx) |
|---|
| [253] | 50 | |
|---|
| [728] | 51 | |
|---|
| [787] | 52 | do ig=1,ngrid |
|---|
| [253] | 53 | totalrneb(ig) = 0. |
|---|
| 54 | |
|---|
| 55 | if (recovery.eq.1) then |
|---|
| 56 | clear = (1.-rneb(ig,1)) |
|---|
| 57 | do l=2,nlayermx |
|---|
| 58 | clear = clear*(1.-rneb(ig,l)) |
|---|
| 59 | enddo |
|---|
| 60 | totalrneb(ig) = 1.-clear |
|---|
| 61 | |
|---|
| 62 | elseif (recovery.eq.2) then |
|---|
| 63 | totalrneb(ig) = rneb(ig,1) |
|---|
| [728] | 64 | do l=2,14 !nlayermx |
|---|
| [253] | 65 | totalrneb(ig) = max(rneb(ig,l),totalrneb(ig)) |
|---|
| 66 | enddo |
|---|
| 67 | |
|---|
| 68 | elseif (recovery.eq.3) then |
|---|
| 69 | totalrneb(ig) = rneb(ig,1) |
|---|
| 70 | do l=2,nlayermx |
|---|
| 71 | totalrneb(ig) = min(rneb(ig,l),totalrneb(ig)) |
|---|
| 72 | enddo |
|---|
| 73 | |
|---|
| [728] | 74 | elseif (recovery.eq.4) then |
|---|
| 75 | totalrneb(ig) = CLFfixval |
|---|
| 76 | |
|---|
| 77 | elseif (recovery.eq.5) then |
|---|
| 78 | totalrneb(ig) = rneb(ig,1) |
|---|
| 79 | do l=1,nlayermx |
|---|
| 80 | masse(l)=pq(ig,l,igcm_h2o_ice)*(pplev(ig,l)-pplev(ig,l+1)) |
|---|
| 81 | enddo |
|---|
| 82 | ltau_max=maxloc(masse,dim=1) |
|---|
| 83 | totalrneb(ig) = rneb(ig,ltau_max) |
|---|
| 84 | |
|---|
| 85 | elseif (recovery.eq.6) then |
|---|
| 86 | totalrneb(ig) = 0. |
|---|
| 87 | do l=1,nlayermx |
|---|
| 88 | masse(l)=pq(ig,l,igcm_h2o_ice)*(pplev(ig,l)-pplev(ig,l+1)) |
|---|
| 89 | masse(l)=max(masse(l),0.) |
|---|
| 90 | enddo |
|---|
| 91 | massetot=sum(masse,dim=1) |
|---|
| 92 | do l=1,nlayermx |
|---|
| 93 | totalrneb(ig) = totalrneb(ig)+rneb(ig,l)*masse(l)/massetot |
|---|
| 94 | enddo |
|---|
| 95 | |
|---|
| 96 | elseif (recovery.eq.7) then |
|---|
| 97 | |
|---|
| 98 | rneb2(:)=rneb(ig,1:nlayermx) |
|---|
| 99 | tau_min=MIN(tau_c,MAXVAL(tau(ig,1:nlayermx))/2.) |
|---|
| 100 | do l=1,nlayermx |
|---|
| 101 | if(tau(ig,l)<tau_min) rneb2(l)=0. |
|---|
| 102 | enddo |
|---|
| 103 | totalrneb(ig)=maxval(rneb2(1:nlayermx)) |
|---|
| 104 | |
|---|
| 105 | endif ! (recovery=) |
|---|
| 106 | |
|---|
| [253] | 107 | totalrneb(ig) = min(1.,totalrneb(ig)) |
|---|
| 108 | totalrneb(ig) = max(0.,totalrneb(ig)) |
|---|
| 109 | |
|---|
| 110 | enddo ! (ig=) |
|---|
| 111 | |
|---|
| 112 | |
|---|
| 113 | end subroutine totalcloudfrac |
|---|
