dyn3d/Guide/tau2alpha.f

module tau2alpha_m

  IMPLICIT NONE

contains

  SUBROUTINE tau2alpha(dxdy, rlat, taumin, taumax, alpha)

    use conf_guide_m, only: lat_min_guide, lat_max_guide, factt
    use init_tau2alpha_m, only: dxdy_min, dxdy_max, gamma
    USE nr_util, ONLY: assert_eq

    REAL, intent(in):: dxdy(:, :) ! (n_lon, n_lat)
    REAL, intent(in):: rlat(:) ! (n_lat)
    REAL, intent(in):: taumin, taumax
    real, intent(out):: alpha(:, :) ! (n_lon, n_lat)

    ! Local:
    REAL a_min, a_max, xi
    INTEGER i, j, n_lon, n_lat

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

    PRINT *, 'Call sequence information: tau2alpha'

    n_lon = assert_eq(size(alpha, 1), size(dxdy, 1), "tau2alpha n_lon")
    n_lat = assert_eq(size(alpha, 2), size(dxdy, 2), size(rlat), &
         "tau2alpha n_lat")

    a_min = factt / taumax
    a_max = factt / taumin

    DO j = 1, n_lat
       IF (lat_min_guide <= rlat(j) .AND. rlat(j) <= lat_max_guide) THEN
          DO i = 1, n_lon
             xi = min(((dxdy_max - dxdy(i, j)) &
                  / (dxdy_max - dxdy_min))**gamma, 1.)
             alpha(i, j) = 1. - exp(- xi * a_min - (1. - xi) * a_max)
          END DO
       ELSE
          alpha(:, j) = 0.
       END IF
    END DO

  END SUBROUTINE tau2alpha

end module tau2alpha_m
1	module tau2alpha_m
2
3	IMPLICIT NONE
4
5	contains
6
7	SUBROUTINE tau2alpha(dxdy, rlat, taumin, taumax, alpha)
8
9	use conf_guide_m, only: lat_min_guide, lat_max_guide, factt
10	use init_tau2alpha_m, only: dxdy_min, dxdy_max, gamma
11	USE nr_util, ONLY: assert_eq
12
13	REAL, intent(in):: dxdy(:, :) ! (n_lon, n_lat)
14	REAL, intent(in):: rlat(:) ! (n_lat)
15	REAL, intent(in):: taumin, taumax
16	real, intent(out):: alpha(:, :) ! (n_lon, n_lat)
17
18	! Local:
19	REAL a_min, a_max, xi
20	INTEGER i, j, n_lon, n_lat
21
22	!------------------------------------------------------------
23
24	PRINT *, 'Call sequence information: tau2alpha'
25
26	n_lon = assert_eq(size(alpha, 1), size(dxdy, 1), "tau2alpha n_lon")
27	n_lat = assert_eq(size(alpha, 2), size(dxdy, 2), size(rlat), &
28	"tau2alpha n_lat")
29
30	a_min = factt / taumax
31	a_max = factt / taumin
32
33	DO j = 1, n_lat
34	IF (lat_min_guide <= rlat(j) .AND. rlat(j) <= lat_max_guide) THEN
35	DO i = 1, n_lon
36	xi = min(((dxdy_max - dxdy(i, j)) &
37	/ (dxdy_max - dxdy_min))**gamma, 1.)
38	alpha(i, j) = 1. - exp(- xi * a_min - (1. - xi) * a_max)
39	END DO
40	ELSE
41	alpha(:, j) = 0.
42	END IF
43	END DO
44
45	END SUBROUTINE tau2alpha
46
47	end module tau2alpha_m