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module disvert_m |
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use dimensions, only: llm |
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implicit none |
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private llm, hybrid, funcd, y, ya, compute_ab |
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real, save:: ap(llm+1), pa ! in Pa |
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real, save:: bp(llm+1) |
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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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! half-level, between layers "l" and "l-1" |
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real, save:: presnivs(llm) |
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! pressions approximatives des milieux de couches, en Pa |
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real, parameter:: preff = 101325. ! in Pa |
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real y, ya ! for the hybrid function |
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contains |
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SUBROUTINE disvert |
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! From dyn3d/disvert.F, version 1.1.1.1, 2004/05/19 12:53:05 |
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! Author: P. Le Van |
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! This procedure sets the vertical grid. It defines the host |
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! 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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! Local: |
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real ds(llm) |
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! "ds(l)" : \'epaisseur de la couche "l" dans la coordonn\'ee "s" |
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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, allocatable:: 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" |
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write(unit=*, nml=disvert_nml) |
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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, nml=disvert_nml) |
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s(1) = 1. |
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s(llm+1) = 0. |
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select case (vert_sampling) |
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case ("tropo") |
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! with llm = 19 for CMIP 3 |
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forall (l = 1: llm) ds(l) & |
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= dsigmin + 7. * SIN(pi * (REAL(l) - 0.5) / real(llm + 1))**2 |
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ds = ds / sum(ds) |
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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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call compute_ab |
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case ("strato") |
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! with llm = 39 and dsigmin = 0.3 for CMIP5 |
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forall (l = 1: llm) x(l) = pi * (l - 0.5) / (llm + 1) |
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ds = (dsigmin + 7. * SIN(x)**2) * (1. - tanh(2 * x / pi - 1.))**2 / 4. |
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ds = ds / sum(ds) |
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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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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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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 |
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print *, 'Wrong value for "vert_sampling"' |
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stop 1 |
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END select |
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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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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) |
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end subroutine compute_ab |
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!********************************************************** |
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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 disvert_m |