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module grid_noro_m |
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implicit none |
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contains |
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SUBROUTINE grid_noro(xdata, ydata, zdata, x, y, zphi, zmea, zstd, zsig, & |
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zgam, zthe, zpic, zval, mask) |
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! From dyn3d/grid_noro.F, version 1.1.1.1 2004/05/19 12:53:06 |
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! Authors: Fran\c{}cois Lott, Laurent Li, A. Harzallah and Laurent |
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! Fairhead |
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|
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! Compute the parameters of the sub-grid scale orography scheme as |
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! described in Lott and Miller (1997) and Lott (1999). |
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! Target points are on a rectangular grid: |
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! jjm + 1 latitudes including North and South Poles; |
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! iim + 1 longitudes, with periodicity: longitude(iim + 1) = longitude(1) |
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! At the poles the field value is repeated iim + 1 times. |
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! The parameters a, b, c, d represent the limite of the target |
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! gridpoint region. The means over this region are calculated from |
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! US Navy data, ponderated by a weight proportional to the surface |
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! occupied by the data inside the model gridpoint area. In most |
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! circumstances, this weight is the ratio between the surface of |
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! the US Navy gridpoint area and the surface of the model gridpoint |
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! area. See "grid_noto.txt". |
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|
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use dimensions, only: iim, jjm |
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use mva9_m, only: mva9 |
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use nr_util, only: assert, pi |
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! Coordinates of input field: |
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REAL, intent(in):: xdata(:) ! (iusn) |
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REAL, intent(in):: ydata(:) ! (jusn) |
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REAL, intent(in):: zdata(:, :) ! (iusn, jusn) input field, in m |
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REAL, intent(in):: x(:), y(:) ! coordinates of output field |
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|
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! Correlations of US Navy orography gradients: |
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REAL, intent(out):: zphi(:, :) ! (iim + 1, jjm + 1) |
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! geoptential height of orography, not smoothed, in m |
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real, intent(out):: zmea(:, :) ! (iim + 1, jjm + 1) smoothed orography |
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real, intent(out):: zstd(:, :) ! (iim + 1, jjm + 1) Standard deviation |
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REAL, intent(out):: zsig(:, :) ! (iim + 1, jjm + 1) Slope |
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real, intent(out):: zgam(:, :) ! (iim + 1, jjm + 1) Anisotropy |
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real, intent(out):: zthe(:, :) ! (iim + 1, jjm + 1) |
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! Orientation of the small axis |
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REAL, intent(out):: zpic(:, :) ! (iim + 1, jjm + 1) Maximum altitude |
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real, intent(out):: zval(:, :) ! (iim + 1, jjm + 1) Minimum altitude |
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real, intent(out):: mask(:, :) ! (iim + 1, jjm + 1) fraction of land |
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! Local: |
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! In this version it is assumed that the input data come from |
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! the US Navy dataset: |
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integer, parameter:: iusn = 2160, jusn = 1080 |
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integer, parameter:: iext = 216 |
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REAL xusn(iusn + 2 * iext), yusn(jusn + 2) |
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REAL zusn(iusn + 2 * iext, jusn + 2) ! in m |
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|
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! Intermediate fields (correlations of orography gradient) |
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REAL, dimension(iim + 1, jjm + 1):: ztz, zxtzx, zytzy, zxtzy, weight |
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|
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! Correlations of US Navy orography gradients: |
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REAL, dimension(iusn + 2 * iext, jusn + 2):: zxtzxusn, zytzyusn, zxtzyusn |
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|
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real, dimension(iim + 1, jjm + 1):: mask_tmp, num_tot, num_lan |
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REAL a(iim + 1), b(iim + 1), c(jjm + 1), d(jjm + 1) |
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real weighx, weighy, xincr, xk, xp, xm, xw, xq, xl |
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real zbordnor, zdeltax, zbordsud, zdeltay, zbordoue, zlenx, zleny, zmeasud |
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real zweinor, zweisud, zmeanor, zbordest |
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integer ii, i, jj, j |
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real, parameter:: rad = 6371229. |
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!------------------------------- |
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print *, "Call sequence information: grid_noro" |
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call assert((/size(xdata), size(zdata, 1)/) == iusn, "grid_noro iusn") |
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call assert((/size(ydata), size(zdata, 2)/) == jusn, "grid_noro jusn") |
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call assert((/size(x), size(zphi, 1), size(zmea, 1), size(zstd, 1), & |
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size(zsig, 1), size(zgam, 1), size(zthe, 1), size(zpic, 1), & |
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size(zval, 1), size(mask, 1)/) == iim + 1, "grid_noro iim") |
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call assert((/size(y), size(zphi, 2), size(zmea, 2), size(zstd, 2), & |
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size(zsig, 2), size(zgam, 2), size(zthe, 2), size(zpic, 2), & |
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size(zval, 2), size(mask, 2)/) == jjm + 1, "grid_noro jjm") |
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print *, "Parameters of subgrid-scale orography" |
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zdeltay = 2. * pi / real(jusn) * rad |
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! Extension of the US Navy database for computations at boundaries: |
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DO j = 1, jusn |
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yusn(j + 1) = ydata(j) |
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DO i = 1, iusn |
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zusn(i + iext, j + 1) = zdata(i, j) |
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xusn(i + iext) = xdata(i) |
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ENDDO |
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DO i = 1, iext |
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zusn(i, j + 1) = zdata(iusn - iext + i, j) |
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xusn(i) = xdata(iusn - iext + i) - 2. * pi |
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zusn(iusn + iext + i, j + 1) = zdata(i, j) |
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xusn(iusn + iext + i) = xdata(i) + 2. * pi |
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ENDDO |
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ENDDO |
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yusn(1) = ydata(1) + (ydata(1) - ydata(2)) |
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yusn(jusn + 2) = ydata(jusn) + (ydata(jusn) - ydata(jusn - 1)) |
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DO i = 1, iusn / 2 + iext |
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zusn(i, 1) = zusn(i + iusn / 2, 2) |
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zusn(i + iusn / 2 + iext, 1) = zusn(i, 2) |
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zusn(i, jusn + 2) = zusn(i + iusn / 2, jusn + 1) |
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zusn(i + iusn / 2 + iext, jusn + 2) = zusn(i, jusn + 1) |
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ENDDO |
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! Compute limits of model gridpoint area (regular grid) |
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a(1) = x(1) - (x(2) - x(1)) / 2.0 |
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b(1) = (x(1) + x(2)) / 2.0 |
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DO i = 2, iim |
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a(i) = b(i - 1) |
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b(i) = (x(i) + x(i + 1)) / 2.0 |
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ENDDO |
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a(iim + 1) = b(iim) |
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b(iim + 1) = x(iim + 1) + (x(iim + 1) - x(iim)) / 2.0 |
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c(1) = y(1) - (y(2) - y(1)) / 2.0 |
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d(1) = (y(1) + y(2)) / 2.0 |
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DO j = 2, jjm |
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c(j) = d(j - 1) |
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d(j) = (y(j) + y(j + 1)) / 2.0 |
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ENDDO |
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c(jjm + 1) = d(jjm) |
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d(jjm + 1) = y(jjm + 1) + (y(jjm + 1) - y(jjm)) / 2.0 |
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! Initialisations : |
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weight = 0. |
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zxtzx = 0. |
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zytzy = 0. |
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zxtzy = 0. |
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ztz = 0. |
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zmea = 0. |
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zpic = - 1E10 |
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zval = 1E10 |
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! Compute slopes correlations on US Navy grid |
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zytzyusn = 0. |
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zxtzxusn = 0. |
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zxtzyusn = 0. |
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DO j = 2, jusn + 1 |
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zdeltax = zdeltay * cos(yusn(j)) |
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DO i = 2, iusn + 2 * iext - 1 |
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zytzyusn(i, j) = (zusn(i, j + 1) - zusn(i, j - 1))**2 / zdeltay**2 |
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zxtzxusn(i, j) = (zusn(i + 1, j) - zusn(i - 1, j))**2 / zdeltax**2 |
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zxtzyusn(i, j) = (zusn(i, j + 1) - zusn(i, j - 1)) / zdeltay & |
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* (zusn(i + 1, j) - zusn(i - 1, j)) / zdeltax |
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ENDDO |
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ENDDO |
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! Summation over gridpoint area |
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zleny = pi / real(jusn) * rad |
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xincr = pi / 2. / real(jusn) |
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DO ii = 1, iim + 1 |
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DO jj = 1, jjm + 1 |
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num_tot(ii, jj) = 0. |
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num_lan(ii, jj) = 0. |
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DO j = 2, jusn + 1 |
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zlenx = zleny * cos(yusn(j)) |
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zdeltax = zdeltay * cos(yusn(j)) |
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zbordnor = (c(jj) - yusn(j) + xincr) * rad |
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zbordsud = (yusn(j) - d(jj) + xincr) * rad |
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weighy = MAX(0., min(zbordnor, zbordsud, zleny)) |
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IF (weighy /= 0) THEN |
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DO i = 2, iusn + 2 * iext - 1 |
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zbordest = (xusn(i) - a(ii) + xincr) * rad * cos(yusn(j)) |
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zbordoue = (b(ii) + xincr - xusn(i)) * rad * cos(yusn(j)) |
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weighx = MAX(0., min(zbordest, zbordoue, zlenx)) |
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IF (weighx /= 0) THEN |
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num_tot(ii, jj) = num_tot(ii, jj) + 1. |
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if (zusn(i, j) >= 1.) & |
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num_lan(ii, jj) = num_lan(ii, jj) + 1. |
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weight(ii, jj) = weight(ii, jj) + weighx * weighy |
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zxtzx(ii, jj) = zxtzx(ii, jj) & |
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+ zxtzxusn(i, j) * weighx * weighy |
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zytzy(ii, jj) = zytzy(ii, jj) & |
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+ zytzyusn(i, j) * weighx * weighy |
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zxtzy(ii, jj) = zxtzy(ii, jj) & |
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+ zxtzyusn(i, j) * weighx * weighy |
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ztz(ii, jj) = ztz(ii, jj) & |
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+ zusn(i, j) * zusn(i, j) * weighx * weighy |
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! mean |
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zmea(ii, jj) = zmea(ii, jj) + zusn(i, j) * weighx * weighy |
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! peacks |
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zpic(ii, jj) = max(zpic(ii, jj), zusn(i, j)) |
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! valleys |
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zval(ii, jj) = min(zval(ii, jj), zusn(i, j)) |
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ENDIF |
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ENDDO |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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if (any(weight == 0.)) then |
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print *, "zero weight in grid_noro" |
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stop 1 |
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end if |
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! Compute parameters needed by the Lott & Miller (1997) and Lott |
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! (1999) subgrid-scale orographic scheme. |
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DO ii = 1, iim + 1 |
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DO jj = 1, jjm + 1 |
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mask(ii, jj) = num_lan(ii, jj) / num_tot(ii, jj) |
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! Mean orography: |
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zmea (ii, jj) = zmea (ii, jj) / weight(ii, jj) |
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zxtzx(ii, jj) = zxtzx(ii, jj) / weight(ii, jj) |
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zytzy(ii, jj) = zytzy(ii, jj) / weight(ii, jj) |
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zxtzy(ii, jj) = zxtzy(ii, jj) / weight(ii, jj) |
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ztz(ii, jj) = ztz(ii, jj) / weight(ii, jj) |
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! Standard deviation: |
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zstd(ii, jj) = sqrt(MAX(0., ztz(ii, jj) - zmea(ii, jj)**2)) |
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ENDDO |
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ENDDO |
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! Correct values of horizontal slope near the poles: |
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DO ii = 1, iim + 1 |
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zxtzx(ii, 1) = zxtzx(ii, 2) |
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zxtzx(ii, jjm + 1) = zxtzx(ii, jjm) |
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zxtzy(ii, 1) = zxtzy(ii, 2) |
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zxtzy(ii, jjm + 1) = zxtzy(ii, jjm) |
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zytzy(ii, 1) = zytzy(ii, 2) |
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zytzy(ii, jjm + 1) = zytzy(ii, jjm) |
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ENDDO |
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guez |
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! Masque prenant en compte maximum de terre. On met un seuil \`a 10 |
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! % de terre car en dessous les param\`etres de surface n'ont pas de |
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! sens. |
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mask_tmp = merge(1., 0., mask >= 0.1) |
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zphi(:iim, :) = zmea(:iim, :) * mask_tmp(:iim, :) |
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! (zmea is not yet smoothed) |
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guez |
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! Filters to smooth out fields for input into subgrid-scale |
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! orographic scheme. |
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! First filter, moving average over 9 points. |
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guez |
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CALL MVA9(zmea) |
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CALL MVA9(zstd) |
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CALL MVA9(zpic) |
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CALL MVA9(zval) |
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CALL MVA9(zxtzx) |
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CALL MVA9(zxtzy) |
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CALL MVA9(zytzy) |
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guez |
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DO ii = 1, iim |
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DO jj = 1, jjm + 1 |
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! Coefficients K, L et M: |
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xk = (zxtzx(ii, jj) + zytzy(ii, jj)) / 2. |
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xl = (zxtzx(ii, jj) - zytzy(ii, jj)) / 2. |
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xm = zxtzy(ii, jj) |
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xp = xk - sqrt(xl**2 + xm**2) |
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xq = xk + sqrt(xl**2 + xm**2) |
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xw = 1e-8 |
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if (xp <= xw) xp = 0. |
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if (xq <= xw) xq = xw |
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if (abs(xm) <= xw) xm = xw * sign(1., xm) |
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guez |
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! modification pour masque de terre fractionnaire |
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! slope: |
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zsig(ii, jj) = sqrt(xq) * mask_tmp(ii, jj) |
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! isotropy: |
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zgam(ii, jj) = xp / xq * mask_tmp(ii, jj) |
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! angle theta: |
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zthe(ii, jj) = 57.29577951 * atan2(xm, xl) / 2. * mask_tmp(ii, jj) |
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guez |
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ENDDO |
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ENDDO |
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guez |
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guez |
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zmea(:iim, :) = zmea(:iim, :) * mask_tmp(:iim, :) |
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zpic(:iim, :) = zpic(:iim, :) * mask_tmp(:iim, :) |
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zval(:iim, :) = zval(:iim, :) * mask_tmp(:iim, :) |
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zstd(:iim, :) = zstd(:iim, :) * mask_tmp(:iim, :) |
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guez |
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guez |
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print *, 'MEAN ORO: ', MAXVAL(zmea(:iim, :)) |
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print *, 'ST. DEV.: ', MAXVAL(zstd(:iim, :)) |
298 |
|
|
print *, 'PENTE: ', MAXVAL(zsig(:iim, :)) |
299 |
|
|
print *, 'ANISOTROP: ', MAXVAL(zgam(:iim, :)) |
300 |
|
|
print *, 'ANGLE: ', minval(zthe(:iim, :)), MAXVAL(zthe(:iim, :)) |
301 |
|
|
print *, 'pic: ', MAXVAL(zpic(:iim, :)) |
302 |
|
|
print *, 'val: ', MAXVAL(zval(:iim, :)) |
303 |
|
|
|
304 |
guez |
68 |
! gamma and theta at 1. and 0. at poles |
305 |
|
|
zmea(iim + 1, :) = zmea(1, :) |
306 |
|
|
zphi(iim + 1, :) = zphi(1, :) |
307 |
|
|
zpic(iim + 1, :) = zpic(1, :) |
308 |
|
|
zval(iim + 1, :) = zval(1, :) |
309 |
|
|
zstd(iim + 1, :) = zstd(1, :) |
310 |
|
|
zsig(iim + 1, :) = zsig(1, :) |
311 |
|
|
zgam(iim + 1, :) = zgam(1, :) |
312 |
|
|
zthe(iim + 1, :) = zthe(1, :) |
313 |
guez |
3 |
|
314 |
guez |
147 |
zweinor = sum(weight(:iim, 1)) |
315 |
|
|
zweisud = sum(weight(:iim, jjm + 1)) |
316 |
|
|
zmeanor = sum(zmea(:iim, 1) * weight(:iim, 1)) |
317 |
|
|
zmeasud = sum(zmea(:iim, jjm + 1) * weight(:iim, jjm + 1)) |
318 |
guez |
3 |
|
319 |
guez |
68 |
zmea(:, 1) = zmeanor / zweinor |
320 |
|
|
zmea(:, jjm + 1) = zmeasud / zweisud |
321 |
guez |
3 |
|
322 |
guez |
68 |
zphi(:, 1) = zmeanor / zweinor |
323 |
|
|
zphi(:, jjm + 1) = zmeasud / zweisud |
324 |
guez |
3 |
|
325 |
guez |
147 |
zpic(:, 1) = sum(zpic(:iim, 1) * weight(:iim, 1)) / zweinor |
326 |
|
|
zpic(:, jjm + 1) = sum(zpic(:iim, jjm + 1) * weight(:iim, jjm + 1)) & |
327 |
|
|
/ zweisud |
328 |
guez |
3 |
|
329 |
guez |
147 |
zval(:, 1) = sum(zval(:iim, 1) * weight(:iim, 1)) / zweinor |
330 |
|
|
zval(:, jjm + 1) = sum(zval(:iim, jjm + 1) * weight(:iim, jjm + 1)) & |
331 |
|
|
/ zweisud |
332 |
guez |
3 |
|
333 |
guez |
147 |
zstd(:, 1) = sum(zstd(:iim, 1) * weight(:iim, 1)) / zweinor |
334 |
|
|
zstd(:, jjm + 1) = sum(zstd(:iim, jjm + 1) * weight(:iim, jjm + 1)) & |
335 |
|
|
/ zweisud |
336 |
guez |
3 |
|
337 |
guez |
147 |
zsig(:, 1) = sum(zsig(:iim, 1) * weight(:iim, 1)) / zweinor |
338 |
|
|
zsig(:, jjm + 1) = sum(zsig(:iim, jjm + 1) * weight(:iim, jjm + 1)) & |
339 |
|
|
/ zweisud |
340 |
guez |
3 |
|
341 |
guez |
68 |
zgam(:, 1) = 1. |
342 |
|
|
zgam(:, jjm + 1) = 1. |
343 |
guez |
3 |
|
344 |
guez |
68 |
zthe(:, 1) = 0. |
345 |
|
|
zthe(:, jjm + 1) = 0. |
346 |
guez |
3 |
|
347 |
|
|
END SUBROUTINE grid_noro |
348 |
|
|
|
349 |
|
|
end module grid_noro_m |