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module inifilr_m |
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|
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IMPLICIT NONE |
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|
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INTEGER jfiltnu, jfiltnv |
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! index of the last line filtered in northern hemisphere at rlat[uv] |
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! latitudes |
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|
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integer jfiltsu, jfiltsv |
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! index of the first line filtered in southern hemisphere at |
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! rlat[uv] latitudes |
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|
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! Filtre pour les champs situes sur la grille scalaire (longitudes |
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! rlonv, latitudes rlatu) : |
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real, pointer:: matriceun(:, :, :) ! (iim, iim, jfiltnu - 1) |
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real, pointer:: matriceus(:, :, :) ! (iim, iim, jjm - jfiltsu + 1) |
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|
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! Filtre pour les champs situes sur la grille scalaire (longitudes |
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! rlonv, latitudes rlatu), pour le filtre inverse : |
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real, pointer:: matrinvn(:, :, :) ! (iim, iim, jfiltnu - 1) |
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real, pointer:: matrinvs(:, :, :) ! (iim, iim, jjm - jfiltsu + 1) |
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|
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! Filtre pour les champs situes sur la grille de la vorticit\'e |
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! (longitudes rlonu, latitudes rlatv) |
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real, pointer:: matricevn(:, :, :) ! (iim, iim, jfiltnv) matrice |
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real, pointer:: matricevs(:, :, :) ! (iim, iim, jjm - jfiltsv + 1) |
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|
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contains |
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|
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SUBROUTINE inifilr |
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|
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! From filtrez/inifilr.F, version 1.1.1.1, 2004/05/19 12:53:09 |
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! H. Upadhyaya, O. Sharma |
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|
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! This procedure computes the filtering coefficients for scalar |
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! lines and meridional wind v lines. The modes are filtered from |
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! modfrst to iim. We filter all those latitude lines where coefil |
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! < 1. No filtering at poles. colat0 is to be used when alpha |
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! (stretching coefficient) is set equal to zero for the regular |
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! grid case. |
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|
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USE dimens_m, ONLY : iim, jjm |
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USE dynetat0_m, ONLY : rlatu, rlatv, xprimu, grossismx |
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use inifgn_m, only: inifgn |
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use inifilr_hemisph_m, only: inifilr_hemisph |
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use jumble, only: new_unit |
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use nr_util, only: pi, ifirstloc, assert |
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|
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! Local: |
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|
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REAL dlatu(jjm) |
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REAL rlamda(2:iim) ! > 0, in descending order |
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real eignvl(iim) ! eigenvalues (<= 0) sorted in descending order |
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INTEGER j, unit |
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REAL colat0 ! > 0 |
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integer j1 ! index of negative latitude closest to the equator |
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|
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real eignfnu(iim, iim), eignfnv(iim, iim) |
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! eigenvectors of the discrete second derivative with respect to |
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! longitude, at rlon[uv] longitudes |
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|
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!----------------------------------------------------------- |
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|
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print *, "Call sequence information: inifilr" |
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|
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CALL inifgn(eignvl, eignfnu, eignfnv) |
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|
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! Calcul de colat0 |
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forall (j = 1:jjm) dlatu(j) = rlatu(j) - rlatu(j + 1) |
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colat0 = min(0.5, minval(dlatu) / minval(xprimu(:iim))) |
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PRINT *, 'colat0 = ', colat0 |
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|
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rlamda = iim / pi / colat0 * grossismx / sqrt(- eignvl(2: iim)) |
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print *, "1 / rlamda(iim) = ", 1. / rlamda(iim) |
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! This is demonstrated in the notes but just to be sure: |
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call assert(rlamda(iim) * colat0 >= 1. - 2. * epsilon(0.), & |
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"inifilr rlamda(iim) * colat0") |
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|
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call new_unit(unit) |
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open(unit, file = "modfrst.csv", status = "replace", action = "write") |
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write(unit, fmt = *) '"rlat (degrees)" modfrst' ! title line |
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|
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j1 = ifirstloc(rlatu <= 0.) |
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|
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call inifilr_hemisph(rlatu(j1 - 1:2:- 1), rlamda, unit, eignfnv, jfiltnu, & |
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matriceun, matrinvn) |
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jfiltnu = j1 - jfiltnu |
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matriceun = matriceun(:, :, jfiltnu - 1:1:- 1) |
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matrinvn = matrinvn(:, :, jfiltnu - 1:1:- 1) |
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|
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call inifilr_hemisph(- rlatu(j1:jjm), rlamda, unit, eignfnv, jfiltsu, & |
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matriceus, matrinvs) |
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jfiltsu = j1 - 1 + jfiltsu |
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|
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j1 = ifirstloc(rlatv <= 0.) |
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|
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call inifilr_hemisph(rlatv(j1 - 1:1:- 1), rlamda, unit, eignfnu, jfiltnv, & |
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matricevn) |
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jfiltnv = j1 - jfiltnv |
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matricevn = matricevn(:, :, jfiltnv:1:- 1) |
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|
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call inifilr_hemisph(- rlatv(j1:jjm), rlamda, unit, eignfnu, jfiltsv, & |
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matricevs) |
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jfiltsv = j1 - 1 + jfiltsv |
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|
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close(unit) |
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PRINT *, 'jfiltnu =', jfiltnu |
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PRINT *, 'jfiltsu =', jfiltsu |
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PRINT *, 'jfiltnv =', jfiltnv |
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PRINT *, 'jfiltsv =', jfiltsv |
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|
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END SUBROUTINE inifilr |
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|
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end module inifilr_m |
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