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module fxysinus_m |
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IMPLICIT NONE |
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private |
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public fxysinus |
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contains |
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SUBROUTINE fxysinus(rlatu, yprimu, rlatv, yprimv, rlatu1, yprimu1, rlatu2, & |
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yprimu2, rlonu, xprimu, rlonv, xprimv, rlonm025, xprimm025, rlonp025, & |
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xprimp025) |
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! From LMDZ4/libf/dyn3d/fxysinus.F, version 1.1.1.1, 2004/05/19 12:53:06 |
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! and LMDZ4/libf/grid/fxy_sin.h, v 1.1.1.1, 2004/05/19 12:53:05 |
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! Author: P. Le Van |
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! Calcul des longitudes et des latitudes pour une fonction f(x, y) |
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! avec y = Arcsin(j). |
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USE dimens_m, only: iim, jjm |
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USE nr_util, ONLY: pi |
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INTEGER i, j |
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REAL, intent(out):: rlatu(:), yprimu(:) ! (jjp1) |
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REAL, intent(out):: rlatv(:), yprimv(:) ! (jjm) |
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REAL, intent(out):: rlatu1(:) ! (jjm) |
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real, intent(out):: yprimu1(:), rlatu2(:), yprimu2(:) ! (jjm) |
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REAL, intent(out):: rlonu(:), xprimu(:), rlonv(:), xprimv(:) ! (iip1) |
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REAL, intent(out):: rlonm025(:) ! (iip1) |
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real, intent(out):: xprimm025(:), rlonp025(:), xprimp025(:) ! (iip1) |
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! Local: |
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real fxprim |
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!----------------------------------------------------------------------- |
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fxprim = 2. * pi / iim |
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! Calcul des latitudes et de y' |
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forall(j = 1: jjm + 1) |
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rlatu(j) = fy(real(j)) |
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yprimu(j) = fyprim(real(j)) |
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END forall |
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forall(j = 1: jjm) |
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rlatv(j) = fy(real(j) + 0.5) |
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rlatu1(j) = fy(real(j) + 0.25) |
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rlatu2(j) = fy(real(j) + 0.75) |
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yprimv(j) = fyprim(real(j) + 0.5) |
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yprimu1(j) = fyprim(real(j) + 0.25) |
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yprimu2(j) = fyprim(real(j) + 0.75) |
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END forall |
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! Calcul des longitudes et de x' |
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forall(i = 1: iim + 1) |
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rlonv(i) = fx(real(i)) |
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rlonu(i) = fx(real(i) + 0.5) |
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rlonm025(i) = fx(real(i) - 0.25) |
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rlonp025(i) = fx(real(i) + 0.25) |
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xprimv(i) = fxprim |
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xprimu(i) = fxprim |
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xprimm025(i) = fxprim |
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xprimp025(i) = fxprim |
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END forall |
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END SUBROUTINE fxysinus |
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! Fonctions à changer éventuellement, selon x(x) et y(y) choisis. |
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! Ici, on a l'application particulière suivante : |
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! x = 2 * pi / iim * X |
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! y = pi / jjm * Y |
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pure REAL function fy(rj) |
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USE dimens_m, only: jjm |
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REAL, intent(in):: rj |
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fy = asin(1. + 2. * ((1. - rj) / jjm)) |
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end function fy |
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pure real function fx(ri) |
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USE dimens_m, only: iim |
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USE nr_util, ONLY: pi |
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REAL, intent(in):: ri |
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fx = 2.*pi/real(iim)*(ri-0.5*real(iim)-1.) |
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end function fx |
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pure real function fyprim(rj) |
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USE dimens_m, only: jjm |
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REAL, intent(in):: rj |
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fyprim = 1./sqrt((rj-1.)*(jjm + 1.-rj)) |
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end function fyprim |
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end module fxysinus_m |
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