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module comvert |
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|
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use dimens_m, only: llm |
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|
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implicit none |
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|
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private llm |
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|
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real ap(llm+1), pa ! in Pa |
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real bp(llm+1) |
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real presnivs(llm) ! pressions approximatives des milieux de couches, en Pa |
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real, parameter:: preff = 101325. ! in Pa |
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real nivsigs(llm), nivsig(llm+1) |
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|
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save |
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|
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contains |
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|
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SUBROUTINE disvert |
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|
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! From dyn3d/disvert.F, v 1.1.1.1 2004/05/19 12:53:05 |
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! Auteur : P. Le Van |
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|
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! This procedure sets the vertical grid. |
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! It defines the host variables "ap", "bp", "presnivs", "nivsigs" |
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! and "nivsig". |
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! "pa" should be defined before this procedure is called. |
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|
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use nr_util, only: pi |
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use jumble, only: new_unit |
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|
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REAL s(llm+1) |
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! "s(l)" is the atmospheric hybrid sigma-pressure coordinate at |
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! the interface between layers "l" and "l-1" |
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|
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real ds(llm) |
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! "ds(l)" : épaisseur de la couche "l" dans la coordonnée "s" |
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|
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INTEGER l, unit |
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REAL alpha, x(llm) |
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|
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character(len=7):: s_sampling = "LMD5" |
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! (other allowed values are "param", "strato1", "strato2" and "read") |
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|
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real:: h = 7. ! scale height, in km |
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! (used only if "s_sampling" == "param" or "strato1") |
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|
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! These variables are used only in the case 's_sampling == "param"': |
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real:: deltaz = 0.04 ! épaisseur de la première couche |
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real:: beta = 1.3 ! facteur d'accroissement en haut |
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real:: k0 = 20. ! nombre de couches dans la transition surface |
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real:: k1 = 1.2 ! nombre de couches dans la transition haute |
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|
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REAL ZZ(llm + 1), DZ(llm) ! in km |
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|
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namelist /disvert_nml/h, deltaz, beta, k0, k1, s_sampling |
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|
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!----------------------------------------------------------------------- |
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|
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print *, "Call sequence information: disvert" |
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|
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forall (l = 1: llm) nivsigs(l) = REAL(l) |
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forall (l = 1: llm + 1) nivsig(l) = REAL(l) |
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|
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! Compute "s": |
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|
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print *, "Enter namelist 'disvert_nml'." |
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read(unit=*, nml=disvert_nml) |
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write(unit=*, nml=disvert_nml) |
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|
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select case (s_sampling) |
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case ("param") |
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s(1) = 1. |
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s(llm+1) = 0. |
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alpha = deltaz / tanh(1./k0) * 2. |
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forall (l = 2: llm) s(l) & |
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= cosh((l - 1) / k0) **(- alpha * k0 / h) & |
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* exp(- alpha / h * tanh((llm - k1) / k0) & |
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* beta **(l - 1 - (llm - k1)) / log(beta)) |
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case ("LMD5") |
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! Ancienne discrétisation |
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s(1) = 1. |
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s(llm+1) = 0. |
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forall (l = 1: llm) ds(l) & |
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= 1. + 7. * SIN(pi * (REAL(l)-0.5) / real(llm+1))**2 |
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ds = ds / sum(ds) |
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|
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DO l = llm, 2, -1 |
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s(l) = s(l+1) + ds(l) |
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ENDDO |
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case ("strato1") |
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! F. Lott 70 niveaux et plus |
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s(1) = 1. |
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s(llm+1) = 0. |
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forall (l = 1: llm) dz(l) = 1.56 + TANH(REAL(l - 12) / 5.) & |
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+ TANH(REAL(l - llm) / 10.) / 2. |
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|
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zz(1) = 0. |
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DO l = 2, llm + 1 |
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zz(l) = zz(l - 1) + dz(l - 1) |
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end DO |
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|
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s(2:llm) = (exp(- zz(2:llm) / h) - exp(- zz(llm + 1) / h)) & |
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/ (1. - exp(- zz(llm + 1) / h)) |
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case ("strato2") |
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! Recommended by F. Lott for a domain including the stratosphere |
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s(1) = 1. |
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s(llm+1) = 0. |
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forall (l = 1: llm) x(l) = pi * (l - 0.5) / (llm + 1) |
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|
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ds = (1. + 7. * SIN(x)**2) * (1. - tanh(2 * x / pi - 1.))**2 / 4. |
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ds = ds / sum(ds) |
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|
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DO l = llm, 2, -1 |
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s(l) = s(l+1) + ds(l) |
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ENDDO |
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case("read") |
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call new_unit(unit) |
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open(unit, file="hybrid.csv", status="old", action="read", & |
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position="rewind") |
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read(unit, fmt=*) ! skip title line |
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do l = 1, llm + 1 |
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read(unit, fmt=*) s(l) |
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end do |
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close(unit) |
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! Quick check: |
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if (s(1) /= 1. .or. s(llm + 1) /= 0. .or. s(1) <= s(2)) then |
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print *, '"s" should be in descending order, from 1 to 0.' |
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stop 1 |
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end if |
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case default |
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print *, 'Wrong value for "s_sampling"' |
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stop 1 |
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END select |
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|
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! Calcul de "ap" et "bp" : |
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bp(:llm) = EXP(1. - 1. / s(:llm)**2) |
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bp(llm + 1) = 0. |
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ap = pa * (s - bp) |
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|
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forall (l = 1: llm) presnivs(l) = 0.5 & |
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* (ap(l) + bp(l) * preff + ap(l+1) + bp(l+1) * preff) |
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|
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END SUBROUTINE disvert |
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|
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end module comvert |