libf/dyn3d/disvert.f90

module comvert

  use dimens_m, only: llm

  implicit none

  private llm

  real ap(llm+1), pa ! in Pa
  real bp(llm+1)
  real presnivs(llm) ! pressions approximatives des milieux de couches, en Pa
  real, parameter:: preff = 101325. ! in Pa
  real nivsigs(llm), nivsig(llm+1)

  save

contains

  SUBROUTINE disvert

    ! From dyn3d/disvert.F, v 1.1.1.1 2004/05/19 12:53:05
    ! Auteur : P. Le Van

    ! This procedure sets the vertical grid.
    ! It defines the host variables "ap", "bp", "presnivs", "nivsigs"
    ! and "nivsig".
    ! "pa" should be defined before this procedure is called.

    use nr_util, only: pi
    use jumble, only: new_unit

    REAL s(llm+1)
    ! "s(l)" is the atmospheric hybrid sigma-pressure coordinate at
    ! the interface between layers "l" and "l-1"

    real ds(llm)
    ! "ds(l)" : épaisseur de la couche "l" dans la coordonnée "s"

    INTEGER l, unit
    REAL alpha, x(llm)

    character(len=7):: s_sampling = "LMD5"
    ! (other allowed values are "param", "strato1", "strato2" and "read")

    real:: h = 7. ! scale height, in km
    ! (used only if "s_sampling" == "param" or "strato1")

    ! These variables are used only in the case 's_sampling == "param"':
    real:: deltaz = 0.04 ! épaisseur de la première couche
    real:: beta = 1.3 ! facteur d'accroissement en haut
    real:: k0 = 20. ! nombre de couches dans la transition surface
    real:: k1 = 1.2 ! nombre de couches dans la transition haute

    REAL ZZ(llm + 1), DZ(llm) ! in km

    namelist /disvert_nml/h, deltaz, beta, k0, k1, s_sampling

    !-----------------------------------------------------------------------

    print *, "Call sequence information: disvert"

    forall (l = 1: llm) nivsigs(l) = REAL(l)
    forall (l = 1: llm + 1) nivsig(l) = REAL(l)

    ! Compute "s":

    print *, "Enter namelist 'disvert_nml'."
    read(unit=*, nml=disvert_nml)
    write(unit=*, nml=disvert_nml)

    select case (s_sampling)
    case ("param")
       s(1) = 1.
       s(llm+1) = 0.
       alpha = deltaz / tanh(1./k0) * 2.
       forall (l = 2: llm) s(l) &
            = cosh((l - 1) / k0) **(- alpha * k0 / h) &
            * exp(- alpha / h * tanh((llm - k1) / k0) &
            * beta **(l - 1 - (llm - k1)) / log(beta))
    case ("LMD5")
       ! Ancienne discrétisation
       s(1) = 1.
       s(llm+1) = 0.
       forall (l = 1: llm) ds(l) &
            = 1. + 7. * SIN(pi * (REAL(l)-0.5) / real(llm+1))**2
       ds = ds / sum(ds)

       DO l = llm, 2, -1
          s(l) = s(l+1) + ds(l)
       ENDDO
    case ("strato1")
       ! F. Lott 70 niveaux et plus
       s(1) = 1.
       s(llm+1) = 0.
       forall (l = 1: llm) dz(l) = 1.56 + TANH(REAL(l - 12) / 5.) &
               + TANH(REAL(l - llm) / 10.) / 2.

       zz(1) = 0.
       DO l = 2, llm + 1
          zz(l) = zz(l - 1) + dz(l - 1)
       end DO

       s(2:llm) = (exp(- zz(2:llm) / h) - exp(- zz(llm + 1) / h)) &
            / (1. - exp(- zz(llm + 1) / h))
    case ("strato2")
       ! Recommended by F. Lott for a domain including the stratosphere
       s(1) = 1.
       s(llm+1) = 0.
       forall (l = 1: llm) x(l) = pi * (l - 0.5) / (llm + 1)

       ds = (1. + 7. * SIN(x)**2) * (1. - tanh(2 * x / pi - 1.))**2 / 4.
       ds = ds / sum(ds)

       DO l = llm, 2, -1
          s(l) = s(l+1) + ds(l)
       ENDDO
    case("read")
       call new_unit(unit)
       open(unit, file="hybrid.csv", status="old", action="read", &
            position="rewind")
       read(unit, fmt=*) ! skip title line
       do l = 1, llm + 1
          read(unit, fmt=*) s(l)
       end do
       close(unit)
       ! Quick check:
       if (s(1) /= 1. .or. s(llm + 1) /= 0. .or. s(1) <= s(2)) then
          print *, '"s" should be in descending order, from 1 to 0.'
          stop 1
       end if
    case default
       print *, 'Wrong value for "s_sampling"'
       stop 1
    END select

    ! Calcul de "ap" et "bp" :
    bp(:llm) = EXP(1. - 1. / s(:llm)**2)
    bp(llm + 1) = 0.
    ap = pa * (s - bp)

    forall (l = 1: llm) presnivs(l) = 0.5 &
         * (ap(l) + bp(l) * preff + ap(l+1) + bp(l+1) * preff)

  END SUBROUTINE disvert

end module comvert
1	guez	3	module comvert
2
3			use dimens_m, only: llm
4
5			implicit none
6
7			private llm
8
9	guez	20	real ap(llm+1), pa ! in Pa
10	guez	32	real bp(llm+1)
11	guez	22	real presnivs(llm) ! pressions approximatives des milieux de couches, en Pa
12	guez	3	real, parameter:: preff = 101325. ! in Pa
13			real nivsigs(llm), nivsig(llm+1)
14
15			save
16
17			contains
18
19			SUBROUTINE disvert
20
21			! From dyn3d/disvert.F, v 1.1.1.1 2004/05/19 12:53:05
22			! Auteur : P. Le Van
23
24			! This procedure sets the vertical grid.
25	guez	32	! It defines the host variables "ap", "bp", "presnivs", "nivsigs"
26			! and "nivsig".
27	guez	3	! "pa" should be defined before this procedure is called.
28
29	guez	36	use nr_util, only: pi
30	guez	48	use jumble, only: new_unit
31	guez	3
32			REAL s(llm+1)
33	guez	22	! "s(l)" is the atmospheric hybrid sigma-pressure coordinate at
34			! the interface between layers "l" and "l-1"
35	guez	3
36			real ds(llm)
37			! "ds(l)" : épaisseur de la couche "l" dans la coordonnée "s"
38
39	guez	42	INTEGER l, unit
40	guez	53	REAL alpha, x(llm)
41	guez	3
42			character(len=7):: s_sampling = "LMD5"
43	guez	42	! (other allowed values are "param", "strato1", "strato2" and "read")
44	guez	3
45			real:: h = 7. ! scale height, in km
46			! (used only if "s_sampling" == "param" or "strato1")
47
48			! These variables are used only in the case 's_sampling == "param"':
49			real:: deltaz = 0.04 ! épaisseur de la première couche
50			real:: beta = 1.3 ! facteur d'accroissement en haut
51			real:: k0 = 20. ! nombre de couches dans la transition surface
52			real:: k1 = 1.2 ! nombre de couches dans la transition haute
53
54			REAL ZZ(llm + 1), DZ(llm) ! in km
55
56			namelist /disvert_nml/h, deltaz, beta, k0, k1, s_sampling
57
58			!-----------------------------------------------------------------------
59
60			print *, "Call sequence information: disvert"
61
62			forall (l = 1: llm) nivsigs(l) = REAL(l)
63			forall (l = 1: llm + 1) nivsig(l) = REAL(l)
64
65			! Compute "s":
66
67			print *, "Enter namelist 'disvert_nml'."
68			read(unit=*, nml=disvert_nml)
69			write(unit=*, nml=disvert_nml)
70
71			select case (s_sampling)
72			case ("param")
73	guez	42	s(1) = 1.
74			s(llm+1) = 0.
75	guez	3	alpha = deltaz / tanh(1./k0) * 2.
76			forall (l = 2: llm) s(l) &
77			= cosh((l - 1) / k0) *(- alpha k0 / h) &
78			* exp(- alpha / h * tanh((llm - k1) / k0) &
79			* beta **(l - 1 - (llm - k1)) / log(beta))
80			case ("LMD5")
81			! Ancienne discrétisation
82	guez	42	s(1) = 1.
83			s(llm+1) = 0.
84	guez	3	forall (l = 1: llm) ds(l) &
85			= 1. + 7. * SIN(pi * (REAL(l)-0.5) / real(llm+1))**2
86			ds = ds / sum(ds)
87
88			DO l = llm, 2, -1
89			s(l) = s(l+1) + ds(l)
90			ENDDO
91			case ("strato1")
92			! F. Lott 70 niveaux et plus
93	guez	42	s(1) = 1.
94			s(llm+1) = 0.
95	guez	3	forall (l = 1: llm) dz(l) = 1.56 + TANH(REAL(l - 12) / 5.) &
96			+ TANH(REAL(l - llm) / 10.) / 2.
97
98			zz(1) = 0.
99			DO l = 2, llm + 1
100			zz(l) = zz(l - 1) + dz(l - 1)
101			end DO
102
103			s(2:llm) = (exp(- zz(2:llm) / h) - exp(- zz(llm + 1) / h)) &
104			/ (1. - exp(- zz(llm + 1) / h))
105			case ("strato2")
106			! Recommended by F. Lott for a domain including the stratosphere
107	guez	42	s(1) = 1.
108			s(llm+1) = 0.
109	guez	3	forall (l = 1: llm) x(l) = pi * (l - 0.5) / (llm + 1)
110
111			ds = (1. + 7. * SIN(x)*2) (1. - tanh(2 * x / pi - 1.))**2 / 4.
112			ds = ds / sum(ds)
113
114			DO l = llm, 2, -1
115			s(l) = s(l+1) + ds(l)
116			ENDDO
117	guez	42	case("read")
118			call new_unit(unit)
119			open(unit, file="hybrid.csv", status="old", action="read", &
120			position="rewind")
121			read(unit, fmt=*) ! skip title line
122			do l = 1, llm + 1
123	guez	53	read(unit, fmt=*) s(l)
124	guez	42	end do
125			close(unit)
126			! Quick check:
127			if (s(1) /= 1. .or. s(llm + 1) /= 0. .or. s(1) <= s(2)) then
128			print *, '"s" should be in descending order, from 1 to 0.'
129			stop 1
130			end if
131	guez	3	case default
132			print *, 'Wrong value for "s_sampling"'
133			stop 1
134			END select
135
136			! Calcul de "ap" et "bp" :
137			bp(:llm) = EXP(1. - 1. / s(:llm)**2)
138			bp(llm + 1) = 0.
139			ap = pa * (s - bp)
140
141	guez	32	forall (l = 1: llm) presnivs(l) = 0.5 &
142			* (ap(l) + bp(l) * preff + ap(l+1) + bp(l+1) * preff)
143	guez	3
144			END SUBROUTINE disvert
145
146			end module comvert