libf/phylmd/FCTTRE.f90

module FCTTRE

  ! From phylmd/FCTTRE.inc, version 1.2 2004/06/22 11:45:32

  ! This module includes the thermodynamical functions for the cycle
  ! 39 ECMWF Physics package. Consistent with "SUPHEC_M" basic
  ! physical constants, assuming the partial pressure of water vapour
  ! is given by a first order Taylor expansion of "Qs(T)" with respect
  ! to temperature, using constants in "yoethf_m".

  ! Probably from Buck, 1981, Journal of Applied Meteorology, 20(12),
  ! 1527.

  implicit none

  LOGICAL, PARAMETER:: thermcep= .TRUE.

contains

  REAL function FOEEW(T, DEL)

    use yoethf_m, only: R3LES, R3IES, R4LES, R4IES
    use SUPHEC_M, only: rtt

    REAL, intent(in):: T, DEL

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

    FOEEW = EXP((R3LES * (1. - DEL) + R3IES * DEL) * (T - RTT) &
         / (T - (R4LES * (1. - DEL) + R4IES * DEL)))

  end function FOEEW

  !******************************************

  REAL function FOEDE(T, DEL, P5ARG, QS, PCOARG)

    use yoethf_m, only: R4LES, R4IES

    REAL, intent(in):: T, DEL
    real, intent(in):: P5ARG, QS, PCOARG

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

    FOEDE = QS*PCOARG*P5ARG / (T-(R4LES*(1.-DEL)+R4IES*DEL))**2

  end function FOEDE

  !******************************************

  REAL function qsats(t)

    REAL, intent(in):: T

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

    qsats = 100.0 * 0.622 &
         * 10.**(2.07023 - 0.00320991 * t - 2484.896 / t + 3.56654 * LOG10(t))

  end function qsats

  !******************************************

  REAL function qsatl(t)

    REAL, intent(in):: T

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

    qsatl = 100.0 * 0.622 * 10.**(23.8319 - 2948.964 / t &
         - 5.028 * LOG10(t) - 29810.16 * EXP(- 0.0699382 * t) &
         + 25.21935 * EXP(- 2999.924 / t))

  end function qsatl

  !******************************************

  REAL function dqsats(t, qs)

    use SUPHEC_M, only: RLVTT, rcpd

    REAL, intent(in):: T, qs

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

    dqsats = RLVTT / RCPD * qs * (3.56654/t &
         +2484.896*LOG(10.)/t**2 - 0.00320991*LOG(10.))

  end function dqsats

  !******************************************

  REAL function dqsatl(t, qs)

    use SUPHEC_M, only: RLVTT, rcpd

    REAL, intent(in):: T, qs

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

    dqsatl = RLVTT / RCPD * qs * LOG(10.) &
         * (2948.964/t**2-5.028/LOG(10.)/t &
         +25.21935*2999.924/t**2*EXP(-2999.924/t) &
         +29810.16*0.0699382*EXP(-0.0699382*t))

  end function dqsatl

end module FCTTRE
1	module FCTTRE
2
3	! From phylmd/FCTTRE.inc, version 1.2 2004/06/22 11:45:32
4
5	! This module includes the thermodynamical functions for the cycle
6	! 39 ECMWF Physics package. Consistent with "SUPHEC_M" basic
7	! physical constants, assuming the partial pressure of water vapour
8	! is given by a first order Taylor expansion of "Qs(T)" with respect
9	! to temperature, using constants in "yoethf_m".
10
11	! Probably from Buck, 1981, Journal of Applied Meteorology, 20(12),
12	! 1527.
13
14	implicit none
15
16	LOGICAL, PARAMETER:: thermcep= .TRUE.
17
18	contains
19
20	REAL function FOEEW(T, DEL)
21
22	use yoethf_m, only: R3LES, R3IES, R4LES, R4IES
23	use SUPHEC_M, only: rtt
24
25	REAL, intent(in):: T, DEL
26
27	!-----------------------
28
29	FOEEW = EXP((R3LES * (1. - DEL) + R3IES * DEL) * (T - RTT) &
30	/ (T - (R4LES * (1. - DEL) + R4IES * DEL)))
31
32	end function FOEEW
33
34	!******************************************
35
36	REAL function FOEDE(T, DEL, P5ARG, QS, PCOARG)
37
38	use yoethf_m, only: R4LES, R4IES
39
40	REAL, intent(in):: T, DEL
41	real, intent(in):: P5ARG, QS, PCOARG
42
43	!-----------------------
44
45	FOEDE = QSPCOARGP5ARG / (T-(R4LES(1.-DEL)+R4IESDEL))**2
46
47	end function FOEDE
48
49	!******************************************
50
51	REAL function qsats(t)
52
53	REAL, intent(in):: T
54
55	!-----------------------
56
57	qsats = 100.0 * 0.622 &
58	* 10.*(2.07023 - 0.00320991 t - 2484.896 / t + 3.56654 * LOG10(t))
59
60	end function qsats
61
62	!******************************************
63
64	REAL function qsatl(t)
65
66	REAL, intent(in):: T
67
68	!-----------------------
69
70	qsatl = 100.0 * 0.622 * 10.**(23.8319 - 2948.964 / t &
71	- 5.028 * LOG10(t) - 29810.16 * EXP(- 0.0699382 * t) &
72	+ 25.21935 * EXP(- 2999.924 / t))
73
74	end function qsatl
75
76	!******************************************
77
78	REAL function dqsats(t, qs)
79
80	use SUPHEC_M, only: RLVTT, rcpd
81
82	REAL, intent(in):: T, qs
83
84	!-----------------------
85
86	dqsats = RLVTT / RCPD * qs * (3.56654/t &
87	+2484.896LOG(10.)/t2 - 0.00320991LOG(10.))
88
89	end function dqsats
90
91	!******************************************
92
93	REAL function dqsatl(t, qs)
94
95	use SUPHEC_M, only: RLVTT, rcpd
96
97	REAL, intent(in):: T, qs
98
99	!-----------------------
100
101	dqsatl = RLVTT / RCPD * qs * LOG(10.) &
102	* (2948.964/t**2-5.028/LOG(10.)/t &
103	+25.219352999.924/t2EXP(-2999.924/t) &
104	+29810.160.0699382EXP(-0.0699382*t))
105
106	end function dqsatl
107
108	end module FCTTRE