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: pi, 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 alphamin, alphamax, xi
    INTEGER i, j, n_lon, n_lat
    REAL zlat

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

    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")

    alphamin = factt / taumax
    alphamax = factt / taumin

    DO j = 1, n_lat
       zlat = rlat(j) * 180. / pi
       IF (lat_min_guide <= zlat .AND. zlat <= 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) = xi * alphamin + (1. - xi) * alphamax
          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: pi, 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 alphamin, alphamax, xi
20	INTEGER i, j, n_lon, n_lat
21	REAL zlat
22
23	!------------------------------------------------------------
24
25	PRINT *, 'Call sequence information: tau2alpha'
26
27	n_lon = assert_eq(size(alpha, 1), size(dxdy, 1), "tau2alpha n_lon")
28	n_lat = assert_eq(size(alpha, 2), size(dxdy, 2), size(rlat), &
29	"tau2alpha n_lat")
30
31	alphamin = factt / taumax
32	alphamax = factt / taumin
33
34	DO j = 1, n_lat
35	zlat = rlat(j) * 180. / pi
36	IF (lat_min_guide <= zlat .AND. zlat <= lat_max_guide) THEN
37	DO i = 1, n_lon
38	xi = min(((dxdy_max - dxdy(i, j)) &
39	/ (dxdy_max - dxdy_min))**gamma, 1.)
40	alpha(i, j) = xi * alphamin + (1. - xi) * alphamax
41	END DO
42	ELSE
43	alpha(:, j) = 0.
44	END IF
45	END DO
46
47	END SUBROUTINE tau2alpha
48
49	end module tau2alpha_m