phylmd/Interface_surf/calcul_fluxs.f

module calcul_fluxs_m

  implicit none

contains

  SUBROUTINE calcul_fluxs(tsurf, p1lay, cal, beta, cdragh, ps, qsurf, &
       radsol, t1lay, q1lay, u1lay, v1lay, tAcoef, qAcoef, tBcoef, &
       qBcoef, tsurf_new, evap, fluxlat, flux_t, dflux_s, dflux_l, dif_grnd)

    ! Cette routine calcule les flux en h et q à l'interface et une
    ! température de surface.

    ! L. Fairhead, April 2000

    ! Note that, if cal = 0, beta = 1 and dif_grnd = 0, then tsurf_new
    ! = tsurf and qsurf = qsat.

    ! Libraries:
    use nr_util, only: assert_eq

    use comconst, only: dtphys
    USE fcttre, ONLY: foede, foeew
    USE suphec_m, ONLY: rcpd, rd, retv, rlstt, rlvtt, rtt
    USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2

    real, intent(IN):: tsurf(:) ! (knon) température de surface

    real, intent(IN):: p1lay(:) ! (knon)
    ! pression première couche (milieu de couche)

    real, intent(IN):: cal(:) ! (knon) capacité calorifique du sol
    real, intent(IN):: beta(:) ! (knon) évaporation réelle
    real, intent(IN):: cdragh(:) ! (knon) coefficient d'échange
    real, intent(IN):: ps(:) ! (knon) pression au sol
    real, intent(OUT):: qsurf(:) ! (knon) humidité de l'air au-dessus du sol

    real, intent(IN):: radsol(:) ! (knon)
    ! rayonnement net au sol (longwave + shortwave)

    real, intent(IN):: dif_grnd ! coefficient de diffusion vers le sol profond
    real, intent(IN):: t1lay(:), q1lay(:), u1lay(:), v1lay(:) ! (knon)

    real, intent(IN):: tAcoef(:), qAcoef(:) ! (knon)
    ! coefficients A de la résolution de la couche limite pour T et q

    real, intent(IN):: tBcoef(:), qBcoef(:) ! (knon)
    ! coefficients B de la résolution de la couche limite pour t et q

    real, intent(OUT):: tsurf_new(:) ! (knon) température au sol
    real, intent(OUT):: evap(:) ! (knon)

    real, intent(OUT):: fluxlat(:), flux_t(:) ! (knon)
    ! flux de chaleurs latente et sensible

    real, intent(OUT):: dflux_s(:), dflux_l(:) ! (knon)
    ! dérivées des flux de chaleurs sensible et latente par rapport à
    ! Ts (W m-2 K-1)

    ! Local:
    integer i
    integer knon ! nombre de points \`a traiter
    real, dimension(size(ps)):: mh, oh, mq, nq, oq, dq_s_dt, coef ! (knon)
    real qsat(size(ps)) ! (knon) mass fraction
    real sl(size(ps)) ! (knon) chaleur latente d'évaporation ou de sublimation
    logical delta
    real zcor
    real, parameter:: t_grnd = 271.35
    real, parameter:: min_wind_speed = 1. ! in m s-1

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

    knon = assert_eq([size(tsurf), size(p1lay), size(cal), size(beta), &
         size(cdragh), size(ps), size(qsurf), size(radsol), size(t1lay), &
         size(q1lay), size(u1lay), size(v1lay), size(tAcoef), size(qAcoef), &
         size(tBcoef), size(qBcoef), size(tsurf_new), size(evap), &
         size(fluxlat), size(flux_t), size(dflux_s), size(dflux_l)], &
         "calcul_fluxs knon")

    ! Traitement de l'humidité du sol

    DO i = 1, knon
       delta = rtt >= tsurf(i)
       qsat(i) = MIN(0.5, r2es * FOEEW(tsurf(i), delta) / ps(i))
       zcor = 1. / (1. - retv * qsat(i))
       qsat(i) = qsat(i) * zcor
       dq_s_dt(i) = RCPD * FOEDE(tsurf(i), delta, merge(R5IES * RLSTT, &
            R5LES * RLVTT, delta) / RCPD / (1. + RVTMP2 * q1lay(i)), &
            qsat(i), zcor) / RLVTT
    ENDDO

    coef = cdragh * (min_wind_speed + SQRT(u1lay**2 + v1lay**2)) * p1lay &
         / (RD * t1lay)
    sl = merge(RLSTT, RLVTT, tsurf < RTT)

    ! Q
    oq = 1. - beta * coef * qBcoef * dtphys
    mq = beta * coef * (qAcoef - qsat + dq_s_dt * tsurf) / oq
    nq = - beta * coef * dq_s_dt / oq

    ! H
    oh = 1. - coef * tBcoef * dtphys
    mh = coef * tAcoef / oh
    dflux_s = - coef * RCPD / oh

    tsurf_new = (tsurf + cal / RCPD * dtphys * (radsol + mh + sl * mq) &
         + dif_grnd * t_grnd * dtphys) / (1. - dtphys * cal / RCPD * (dflux_s &
         + sl * nq) + dtphys * dif_grnd)
    evap = - mq - nq * tsurf_new
    fluxlat = - evap * sl
    flux_t = mh + dflux_s * tsurf_new
    dflux_l = sl * nq
    qsurf = (qAcoef - qBcoef * evap * dtphys) * (1. - beta) + beta * (qsat &
         + dq_s_dt * (tsurf_new - tsurf))

  END SUBROUTINE calcul_fluxs

end module calcul_fluxs_m
1	module calcul_fluxs_m
2
3	implicit none
4
5	contains
6
7	SUBROUTINE calcul_fluxs(tsurf, p1lay, cal, beta, cdragh, ps, qsurf, &
8	radsol, t1lay, q1lay, u1lay, v1lay, tAcoef, qAcoef, tBcoef, &
9	qBcoef, tsurf_new, evap, fluxlat, flux_t, dflux_s, dflux_l, dif_grnd)
10
11	! Cette routine calcule les flux en h et q à l'interface et une
12	! température de surface.
13
14	! L. Fairhead, April 2000
15
16	! Note that, if cal = 0, beta = 1 and dif_grnd = 0, then tsurf_new
17	! = tsurf and qsurf = qsat.
18
19	! Libraries:
20	use nr_util, only: assert_eq
21
22	use comconst, only: dtphys
23	USE fcttre, ONLY: foede, foeew
24	USE suphec_m, ONLY: rcpd, rd, retv, rlstt, rlvtt, rtt
25	USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2
26
27	real, intent(IN):: tsurf(:) ! (knon) température de surface
28
29	real, intent(IN):: p1lay(:) ! (knon)
30	! pression première couche (milieu de couche)
31
32	real, intent(IN):: cal(:) ! (knon) capacité calorifique du sol
33	real, intent(IN):: beta(:) ! (knon) évaporation réelle
34	real, intent(IN):: cdragh(:) ! (knon) coefficient d'échange
35	real, intent(IN):: ps(:) ! (knon) pression au sol
36	real, intent(OUT):: qsurf(:) ! (knon) humidité de l'air au-dessus du sol
37
38	real, intent(IN):: radsol(:) ! (knon)
39	! rayonnement net au sol (longwave + shortwave)
40
41	real, intent(IN):: dif_grnd ! coefficient de diffusion vers le sol profond
42	real, intent(IN):: t1lay(:), q1lay(:), u1lay(:), v1lay(:) ! (knon)
43
44	real, intent(IN):: tAcoef(:), qAcoef(:) ! (knon)
45	! coefficients A de la résolution de la couche limite pour T et q
46
47	real, intent(IN):: tBcoef(:), qBcoef(:) ! (knon)
48	! coefficients B de la résolution de la couche limite pour t et q
49
50	real, intent(OUT):: tsurf_new(:) ! (knon) température au sol
51	real, intent(OUT):: evap(:) ! (knon)
52
53	real, intent(OUT):: fluxlat(:), flux_t(:) ! (knon)
54	! flux de chaleurs latente et sensible
55
56	real, intent(OUT):: dflux_s(:), dflux_l(:) ! (knon)
57	! dérivées des flux de chaleurs sensible et latente par rapport à
58	! Ts (W m-2 K-1)
59
60	! Local:
61	integer i
62	integer knon ! nombre de points \`a traiter
63	real, dimension(size(ps)):: mh, oh, mq, nq, oq, dq_s_dt, coef ! (knon)
64	real qsat(size(ps)) ! (knon) mass fraction
65	real sl(size(ps)) ! (knon) chaleur latente d'évaporation ou de sublimation
66	logical delta
67	real zcor
68	real, parameter:: t_grnd = 271.35
69	real, parameter:: min_wind_speed = 1. ! in m s-1
70
71	!---------------------------------------------------------------------
72
73	knon = assert_eq([size(tsurf), size(p1lay), size(cal), size(beta), &
74	size(cdragh), size(ps), size(qsurf), size(radsol), size(t1lay), &
75	size(q1lay), size(u1lay), size(v1lay), size(tAcoef), size(qAcoef), &
76	size(tBcoef), size(qBcoef), size(tsurf_new), size(evap), &
77	size(fluxlat), size(flux_t), size(dflux_s), size(dflux_l)], &
78	"calcul_fluxs knon")
79
80	! Traitement de l'humidité du sol
81
82	DO i = 1, knon
83	delta = rtt >= tsurf(i)
84	qsat(i) = MIN(0.5, r2es * FOEEW(tsurf(i), delta) / ps(i))
85	zcor = 1. / (1. - retv * qsat(i))
86	qsat(i) = qsat(i) * zcor
87	dq_s_dt(i) = RCPD * FOEDE(tsurf(i), delta, merge(R5IES * RLSTT, &
88	R5LES * RLVTT, delta) / RCPD / (1. + RVTMP2 * q1lay(i)), &
89	qsat(i), zcor) / RLVTT
90	ENDDO
91
92	coef = cdragh * (min_wind_speed + SQRT(u1lay2 + v1lay2)) * p1lay &
93	/ (RD * t1lay)
94	sl = merge(RLSTT, RLVTT, tsurf < RTT)
95
96	! Q
97	oq = 1. - beta * coef * qBcoef * dtphys
98	mq = beta * coef * (qAcoef - qsat + dq_s_dt * tsurf) / oq
99	nq = - beta * coef * dq_s_dt / oq
100
101	! H
102	oh = 1. - coef * tBcoef * dtphys
103	mh = coef * tAcoef / oh
104	dflux_s = - coef * RCPD / oh
105
106	tsurf_new = (tsurf + cal / RCPD * dtphys * (radsol + mh + sl * mq) &
107	+ dif_grnd * t_grnd * dtphys) / (1. - dtphys * cal / RCPD * (dflux_s &
108	+ sl * nq) + dtphys * dif_grnd)
109	evap = - mq - nq * tsurf_new
110	fluxlat = - evap * sl
111	flux_t = mh + dflux_s * tsurf_new
112	dflux_l = sl * nq
113	qsurf = (qAcoef - qBcoef * evap * dtphys) * (1. - beta) + beta * (qsat &
114	+ dq_s_dt * (tsurf_new - tsurf))
115
116	END SUBROUTINE calcul_fluxs
117
118	end module calcul_fluxs_m