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module comvert |
module disvert_m |
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use dimens_m, only: llm |
use dimens_m, only: llm |
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implicit none |
implicit none |
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private llm |
private llm, hybrid, funcd, y, ya, compute_ab |
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real ap(llm+1), pa ! in Pa |
real, save:: ap(llm+1), pa ! in Pa |
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real bp(llm+1), dpres(llm) |
real, save:: bp(llm+1) |
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real presnivs(llm) ! pressions approximatives des milieux 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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save |
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contains |
REAL s(llm+1) |
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! "s(l)" is the atmospheric hybrid sigma-pressure coordinate at |
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! half-level, between layers "l" and "l-1" |
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SUBROUTINE disvert |
real, save:: presnivs(llm) |
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! pressions approximatives des milieux de couches, en Pa |
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! From dyn3d/disvert.F, v 1.1.1.1 2004/05/19 12:53:05 |
real, parameter:: preff = 101325. ! in Pa |
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! Auteur : P. Le Van |
real y, ya ! for the hybrid function |
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! This procedure sets the vertical grid. |
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! It defines the host variables "ap", "bp", "dpres", "presnivs", |
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! "nivsigs" and "nivsig". |
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! "pa" should be defined before this procedure is called. |
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use comconst, only: pi |
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REAL s(llm+1) |
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! (atmospheric hybrid sigma-pressure coordinate at the interface |
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! between layers "l" and "l-1") |
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real ds(llm) |
contains |
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! "ds(l)" : épaisseur de la couche "l" dans la coordonnée "s" |
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INTEGER l |
SUBROUTINE disvert |
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REAL alpha, x(llm) |
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character(len=7):: s_sampling = "LMD5" |
! From dyn3d/disvert.F, version 1.1.1.1, 2004/05/19 12:53:05 |
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! (other allowed values are "param", "strato1" and "strato2") |
! Author: P. Le Van |
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real:: h = 7. ! scale height, in km |
! This procedure sets the vertical grid. It defines the host |
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! (used only if "s_sampling" == "param" or "strato1") |
! variables "ap", "bp", "presnivs". "pa" should be defined before |
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! this procedure is called. |
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use jumble, only: read_column, new_unit |
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use nr_util, only: pi, assert |
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use unit_nml_m, only: unit_nml |
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! These variables are used only in the case 's_sampling == "param"': |
! Local: |
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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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REAL ZZ(llm + 1), DZ(llm) ! in km |
real ds(llm) |
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! "ds(l)" : \'epaisseur de la couche "l" dans la coordonn\'ee "s" |
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namelist /disvert_nml/h, deltaz, beta, k0, k1, s_sampling |
INTEGER l, unit |
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REAL x(llm) |
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real:: dsigmin = 1. |
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real zz(llm) ! in km |
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character(len=20):: vert_sampling = "tropo" |
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! Allowed values: "tropo", "param", "strato", "read_hybrid", "read_pressure" |
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! These variables are used only in the case vert_sampling == |
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! "param", and all are in km: |
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real:: vert_scale = 7. ! scale height |
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real:: vert_dzmin = 0.02 ! width of first layer |
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real:: vert_dzlow = 1. ! dz in the low atmosphere |
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real:: vert_z0low = 8. ! height at which resolution reaches dzlow |
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real:: vert_dzmid = 3. ! dz in the mid atmosphere |
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real:: vert_z0mid = 70. ! height at which resolution reaches dzmid |
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real:: vert_h_mid = 20. ! width of the transition |
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real:: vert_dzhig = 11. ! dz in the high atmosphere |
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real:: vert_z0hig = 80. ! height at which resolution reaches dz |
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real:: vert_h_hig = 20. ! width of the transition |
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real, pointer:: p(:) ! (llm + 1) pressure (in hPa) |
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namelist /disvert_nml/vert_sampling, vert_scale, vert_dzmin, vert_dzlow, & |
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vert_z0low, vert_dzmid, vert_z0mid, vert_h_mid, vert_dzhig, & |
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vert_z0hig, vert_h_hig, dsigmin |
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!----------------------------------------------------------------------- |
!----------------------------------------------------------------------- |
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print *, "Call sequence information: disvert" |
print *, "Call sequence information: disvert" |
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forall (l = 1: llm) nivsigs(l) = REAL(l) |
write(unit=*, nml=disvert_nml) |
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forall (l = 1: llm + 1) nivsig(l) = REAL(l) |
print *, "Enter namelist 'disvert_nml'." |
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read(unit=*, nml=disvert_nml) |
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! Compute "s": |
write(unit_nml, nml=disvert_nml) |
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s(1) = 1. |
s(1) = 1. |
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s(llm+1) = 0. |
s(llm+1) = 0. |
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print *, "Enter namelist 'disvert_nml'." |
select case (vert_sampling) |
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read(unit=*, nml=disvert_nml) |
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write(unit=*, nml=disvert_nml) |
case ("tropo") |
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! with llm = 19 for CMIP 3 |
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select case (s_sampling) |
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case ("param") |
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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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forall (l = 1: llm) ds(l) & |
forall (l = 1: llm) ds(l) & |
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= 1. + 7. * SIN(pi * (REAL(l)-0.5) / real(llm+1))**2 |
= dsigmin + 7. * SIN(pi * (REAL(l) - 0.5) / real(llm + 1))**2 |
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ds = ds / sum(ds) |
ds = ds / sum(ds) |
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DO l = llm, 2, -1 |
DO l = llm, 2, -1 |
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s(l) = s(l+1) + ds(l) |
s(l) = s(l+1) + ds(l) |
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ENDDO |
ENDDO |
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case ("strato1") |
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! F. Lott 70 niveaux et plus |
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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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zz(1) = 0. |
call compute_ab |
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DO l = 2, llm + 1 |
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zz(l) = zz(l - 1) + dz(l - 1) |
case ("strato") |
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end DO |
! with llm = 39 and dsigmin = 0.3 for CMIP5 |
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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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forall (l = 1: llm) x(l) = pi * (l - 0.5) / (llm + 1) |
forall (l = 1: llm) x(l) = pi * (l - 0.5) / (llm + 1) |
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ds = (1. + 7. * SIN(x)**2) * (1. - tanh(2 * x / pi - 1.))**2 / 4. |
ds = (dsigmin + 7. * SIN(x)**2) * (1. - tanh(2 * x / pi - 1.))**2 / 4. |
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ds = ds / sum(ds) |
ds = ds / sum(ds) |
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DO l = llm, 2, -1 |
DO l = llm, 2, -1 |
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s(l) = s(l+1) + ds(l) |
s(l) = s(l+1) + ds(l) |
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ENDDO |
ENDDO |
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call compute_ab |
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case ("param") |
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! with llm = 79 for CMIP 6 |
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zz(1) = 0. |
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DO l = 1, llm - 1 |
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zz(l + 1) = zz(l) + vert_dzmin + vert_dzlow & |
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* TANH(zz(l) / vert_z0low) + (vert_dzmid - vert_dzlow) & |
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* (TANH((zz(l) - vert_z0mid) / vert_h_mid) & |
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- TANH(- vert_z0mid / vert_h_mid)) & |
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+ (vert_dzhig - vert_dzmid - vert_dzlow) & |
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* (TANH((zz(l) - vert_z0hig) / vert_h_hig) & |
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- TANH(- vert_z0hig / vert_h_hig)) |
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ENDDO |
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allocate(p(2: llm)) |
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p = preff * EXP(- zz(2:) / vert_scale) |
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ya = pa / preff |
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s(2: llm) = hybrid(p) |
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deallocate(p) ! pointer |
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call compute_ab |
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case("read_hybrid") |
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! Read "ap" and "bp". First line is skipped (title line). "ap" |
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! should be in Pa. First couple of values should correspond to |
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! the surface, that is : "bp" should be in descending order. |
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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=*) ap(l), bp(l) |
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end do |
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close(unit) |
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! Quick check: |
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call assert(ap(1) == 0., ap(llm + 1) == 0., bp(1) == 1., & |
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bp(llm + 1) == 0., "disvert: bad ap or bp values") |
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s(2: llm) = ap(2: llm) / pa + bp(2: llm) |
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case("read_pressure") |
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! Read pressure values, in Pa, in descending order, from preff |
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! to 0. First line is skipped (title line). |
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call read_column("pressure.txt", p, first=2) |
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call assert(size(p) == llm + 1, "disvert: bad number of pressure values") |
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! Quick check: |
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call assert(p(1) == preff, p(llm + 1) == 0., & |
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"disvert: bad pressure values") |
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ya = pa / preff |
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s(2: llm) = hybrid(p(2: llm)) |
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call compute_ab |
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case default |
case default |
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print *, 'Wrong value for "s_sampling"' |
print *, 'Wrong value for "vert_sampling"' |
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stop 1 |
stop 1 |
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END select |
END select |
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! Calcul de "ap" et "bp" : |
forall (l = 1: llm) presnivs(l) = 0.5 & |
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bp(:llm) = EXP(1. - 1. / s(:llm)**2) |
* (ap(l) + bp(l) * preff + ap(l+1) + bp(l+1) * preff) |
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bp(llm + 1) = 0. |
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END SUBROUTINE disvert |
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!********************************************************** |
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subroutine compute_ab |
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! Calcul de "ap" et "bp". |
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where (s >= 1. / sqrt(1. - log(tiny(0.)))) |
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bp = exp(1. - 1. / s**2) |
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elsewhere |
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bp = 0. |
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end where |
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ap = pa * (s - bp) |
ap = pa * (s - bp) |
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forall (l = 1: llm) |
end subroutine compute_ab |
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dpres(l) = bp(l) - bp(l+1) |
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presnivs(l) = 0.5 * (ap(l) + bp(l) * preff + ap(l+1) + bp(l+1) * preff) |
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end forall |
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END SUBROUTINE disvert |
!********************************************************** |
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function hybrid(p) |
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! This procedure computes the hybrid sigma-pressure coordinate |
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! from pressure values, assuming some reference surface |
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! pressure. The procedure assumes, and does not check, that |
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! pressure values are given in descending order. |
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use numer_rec_95, only: rtsafe |
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real, intent(in):: p(:) ! pressure (in hPa) |
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real hybrid(size(p)) ! hybrid sigma-pressure coordinate |
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! Local: |
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integer l |
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!------------------------------------------------------- |
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y = p(1) / preff |
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hybrid(1) = rtsafe(funcd, x1 = 0., x2 = 1., xacc = 1e-4) |
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do l = 2, size(p) |
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y = p(l) / preff |
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! Assuming descending order in pressure: |
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hybrid(l) = rtsafe(funcd, x1 = 0., x2 = hybrid(l - 1), & |
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xacc = hybrid(l - 1) * 1e-4) |
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end do |
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end function hybrid |
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!********************************************************** |
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SUBROUTINE funcd(s, fval, fderiv) |
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REAL, INTENT(IN):: s |
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REAL, INTENT(OUT):: fval, fderiv |
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! Local: |
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real b |
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!------------------------------------ |
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if (s**3 > 1. / huge(0.)) then |
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b = exp(1. - 1. / s**2) |
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fval = ya * s + (1. - ya) * b - y |
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fderiv = ya + 2 * (1. - ya) * b / s**3 |
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else |
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fval = ya * s - y |
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fderiv = ya |
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end if |
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END SUBROUTINE funcd |
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end module comvert |
end module disvert_m |