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contains |
contains |
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SUBROUTINE tau2alpha(type, factt, taumin, taumax, alpha) |
SUBROUTINE tau2alpha(lat_min_guide, lat_max_guide, factt, dxdy, rlat, & |
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taumin, taumax, alpha) |
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USE comgeom, ONLY: cu_2d, cv_2d, rlatu, rlatv |
use init_tau2alpha_m, only: dxdy_min, dxdy_max, gamma |
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use conf_guide_m, only: lat_min_guide, lat_max_guide |
USE nr_util, ONLY: assert_eq |
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USE dimens_m, ONLY: iim, jjm |
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USE nr_util, ONLY: pi |
! Dans le cas où on n'a les analyses que sur une bande de latitudes : |
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USE paramet_m, ONLY: iip1, jjp1 |
REAL, intent(in):: lat_min_guide ! minimum latitude for nudging, in rad |
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USE serre, ONLY: clat, clon, grossismx, grossismy |
real, intent(in):: lat_max_guide ! maximum latitude for nudging, in rad |
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use writefield_m, only: writefield |
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REAL, intent(in):: factt |
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INTEGER, intent(in):: type |
! pas de temps entre deux appels au guidage, en jours |
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REAL, intent(in):: factt, taumin, taumax |
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real, intent(out):: alpha(:, :) |
REAL, intent(in):: dxdy(:, :) ! (n_lon, n_lat) |
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REAL, intent(in):: rlat(:) ! (n_lat) |
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REAL, intent(in):: taumin, taumax |
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real, intent(out):: alpha(:, :) ! (n_lon, n_lat) |
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! Local: |
! Local: |
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REAL dxdy |
REAL a_min, a_max, xi |
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REAL, save:: dxdy_min, dxdy_max |
INTEGER i, j, n_lon, n_lat |
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REAL alphamin, alphamax, xi |
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REAL, SAVE:: gamma |
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INTEGER i, j, ilon, ilat |
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LOGICAL:: first = .TRUE. |
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REAL dx(iip1, jjp1), dy(iip1, jjp1) |
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REAL zlat |
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REAL, save:: dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm) |
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!------------------------------------------------------------ |
!------------------------------------------------------------ |
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IF (first) THEN |
PRINT *, 'Call sequence information: tau2alpha' |
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DO j = 2, jjm |
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DO i = 2, iip1 |
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dx(i, j) = 0.5 * (cu_2d(i - 1, j) + cu_2d(i, j)) / cos(rlatu(j)) |
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END DO |
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dx(1, j) = dx(iip1, j) |
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END DO |
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DO j = 2, jjm |
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DO i = 1, iip1 |
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dy(i, j) = 0.5 * (cv_2d(i, j - 1) + cv_2d(i, j)) |
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END DO |
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END DO |
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DO i = 1, iip1 |
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dx(i, 1) = dx(i, 2) |
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dx(i, jjp1) = dx(i, jjm) |
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dy(i, 1) = dy(i, 2) |
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dy(i, jjp1) = dy(i, jjm) |
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END DO |
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DO j = 1, jjp1 |
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DO i = 1, iip1 |
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dxdys(i, j) = sqrt(dx(i, j)**2 + dy(i, j)**2) |
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END DO |
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END DO |
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CALL writefield("dxdys", dxdys) |
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DO j = 1, jjp1 |
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DO i = 1, iim |
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dxdyu(i, j) = 0.5 * (dxdys(i, j) + dxdys(i + 1, j)) |
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END DO |
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dxdyu(iip1, j) = dxdyu(1, j) |
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END DO |
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DO j = 1, jjm |
n_lon = assert_eq(size(alpha, 1), size(dxdy, 1), "tau2alpha n_lon") |
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DO i = 1, iip1 |
n_lat = assert_eq(size(alpha, 2), size(dxdy, 2), size(rlat), & |
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dxdyv(i, j) = 0.5 * (dxdys(i, j) + dxdys(i, j + 1)) |
"tau2alpha n_lat") |
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a_min = factt / taumax |
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a_max = factt / taumin |
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DO j = 1, n_lat |
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IF (lat_min_guide <= rlat(j) .AND. rlat(j) <= lat_max_guide) THEN |
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DO i = 1, n_lon |
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xi = min(((dxdy_max - dxdy(i, j)) & |
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/ (dxdy_max - dxdy_min))**gamma, 1.) |
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alpha(i, j) = 1. - exp(- xi * a_min - (1. - xi) * a_max) |
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END DO |
END DO |
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END DO |
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! coordonnees du centre du zoom |
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CALL coordij(clon, clat, ilon, ilat) |
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! aire de la maille au centre du zoom |
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dxdy_min = dxdys(ilon, ilat) |
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! dxdy maximal de la maille : |
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dxdy_max = 0. |
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DO j = 1, jjp1 |
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DO i = 1, iip1 |
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dxdy_max = max(dxdy_max, dxdys(i, j)) |
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END DO |
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END DO |
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IF (abs(grossismx - 1.) < 0.1 .OR. abs(grossismy - 1.) < 0.1) THEN |
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PRINT *, 'Attention : modèle peu zoomé.' |
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PRINT *, 'On prend une constante de guidage constante.' |
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ELSE |
ELSE |
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gamma = (dxdy_max - 2. * dxdy_min) / (dxdy_max - dxdy_min) |
alpha(:, j) = 0. |
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IF (gamma < 1E-5) THEN |
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PRINT *, '(dxdy_max - 2. * dxdy_min) / (dxdy_max - dxdy_min) ' & |
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// '< 1e-5' |
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STOP 1 |
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END IF |
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gamma = log(0.5) / log(gamma) |
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PRINT *, 'gamma=', gamma |
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END IF |
END IF |
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first = .false. |
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END IF |
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alphamin = factt / taumax |
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alphamax = factt / taumin |
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DO j = 1, size(alpha, 2) |
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DO i = 1, size(alpha, 1) |
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IF (type==1) THEN |
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dxdy = dxdys(i, j) |
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zlat = rlatu(j) * 180. / pi |
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ELSE IF (type==2) THEN |
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dxdy = dxdyu(i, j) |
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zlat = rlatu(j) * 180. / pi |
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ELSE IF (type==3) THEN |
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dxdy = dxdyv(i, j) |
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zlat = rlatv(j) * 180. / pi |
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END IF |
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IF (abs(grossismx - 1.) < 0.1 .OR. abs(grossismy - 1.) < 0.1) THEN |
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! grille regulière |
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alpha(i, j) = alphamin |
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ELSE |
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xi = ((dxdy_max - dxdy) / (dxdy_max - dxdy_min))**gamma |
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xi = min(xi, 1.) |
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IF (lat_min_guide <= zlat .AND. zlat <= lat_max_guide) THEN |
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alpha(i, j) = xi * alphamin + (1. - xi) * alphamax |
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ELSE |
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alpha(i, j) = 0. |
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END IF |
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END IF |
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END DO |
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END DO |
END DO |
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END SUBROUTINE tau2alpha |
END SUBROUTINE tau2alpha |
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