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C $Header: /u/gcmpack/MITgcm/pkg/gridalt/make_phys_grid.F,v 1.5 2004/11/02 00:54:51 molod Exp $ |
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C $Name: $ |
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|
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subroutine make_phys_grid(drF,hfacC,im1,im2,jm1,jm2,Nr, |
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. Nsx,Nsy,i1,i2,j1,j2,bi,bj,Nrphys,Lbot,dpphys,numlevphys,nlperdyn) |
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c*********************************************************************** |
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c subroutine make_phys_grid |
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c |
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c Purpose: Define the grid that the will be used to run the high-end |
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c atmospheric physics. |
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c |
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c Algorithm: Fit additional levels of some (~) known thickness in |
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c between existing levels of the grid used for the dynamics |
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c |
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c Need: Information about the dynamics grid vertical spacing |
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c |
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c Input: drF - delta r (p*) edge-to-edge |
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c hfacC - fraction of grid box above topography |
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c im1, im2 - beginning and ending i - dimensions |
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c jm1, jm2 - beginning and ending j - dimensions |
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c Nr - number of levels in dynamics grid |
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c Nsx,Nsy - number of processes in x and y direction |
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c i1, i2 - beginning and ending i - index to fill |
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c j1, j2 - beginning and ending j - index to fill |
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c bi, bj - x-dir and y-dir index of process |
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c Nrphys - number of levels in physics grid |
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c |
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c Output: dpphys - delta r (p*) edge-to-edge of physics grid |
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c numlevphys - number of levels used in the physics |
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c nlperdyn - physics level number atop each dynamics layer |
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c |
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c NOTES: 1) Pressure levs are built up from bottom, using p0, ps and dp: |
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c p(i,j,k)=p(i,j,k-1) + dp(k)*ps(i,j)/p0(i,j) |
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c 2) Output dp's are aligned to fit EXACTLY between existing |
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c levels of the dynamics vertical grid |
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c 3) IMPORTANT! This routine assumes the levels are numbered |
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c from the bottom up, ie, level 1 is the surface. |
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c IT WILL NOT WORK OTHERWISE!!! |
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c 4) This routine does NOT work for surface pressures less |
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c (ie, above in the atmosphere) than about 350 mb |
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c*********************************************************************** |
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implicit none |
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c |
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#include "CPP_OPTIONS.h" |
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|
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integer im1,im2,jm1,jm2,Nr,Nsx,Nsy,Nrphys |
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integer i1,i2,j1,j2,bi,bj |
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integer numlevphys |
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_RL hfacC(im1:im2,jm1:jm2,Nr,Nsx,Nsy) |
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_RL dpphys(im1:im2,jm1:jm2,Nrphys,Nsx,Nsy) |
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_RL drF(Nr) |
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integer Lbot(im1:im2,jm1:jm2,Nsx,Nsy) |
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integer nlperdyn(im1:im2,jm1:jm2,Nr,Nsx,Nsy) |
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c |
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integer i,j,L,Lbotij,Lnew |
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c Require 12 (or 15) levels near the surface (300 mb worth) for fizhi. |
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c the dp's are in the dptry arrays: |
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integer ntry,ntry10,ntry40 |
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data ntry10 /12/ |
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data ntry40 /15/ |
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_RL dptry(15),dptry10(12),dptry40(15) |
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_RL dptry_accum(15) |
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data dptry10/300.000,600.000,1000.000,1400.000,1700.000,2500.000, |
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. 2500.000,2500.000,2500.000,5000.000,5000.000,5000.000/ |
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data dptry40/300.000,600.000,1000.000,1400.000,1700.000, |
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. 2500.000,2500.000,2500.000,2500.000,2500.000,2500.000, |
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. 2500.000,2500.000,2500.000,2500.000/ |
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_RL deltap, dpstar_accum |
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integer nlbotmax, nstart, nlevs, nlphys, ndone |
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integer nextra |
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c |
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if( (Nr.eq.10) .or. (Nr.eq.20) ) then |
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ntry = ntry10 |
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do L = 1,ntry |
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dptry(L) = dptry10(L) |
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enddo |
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elseif(Nr.eq.40) then |
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ntry = ntry40 |
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do L = 1,ntry |
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dptry(L) = dptry40(L) |
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enddo |
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else |
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print *,' Dont know how to make fizhi grid ' |
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stop |
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endif |
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c |
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nextra = ntry |
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c |
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do L = 1,Nr |
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do j = j1,j2 |
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do i = i1,i2+1 |
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nlperdyn(i,j,L,bi,bj) = 0 |
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enddo |
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enddo |
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enddo |
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c |
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c Figure out how many physics levels there will be |
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c (need 12 between sfc and 300 mb above it - see how many |
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c there are in the dynamics if the surface pressure is at |
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c the sum of drF, ie, the maximum dynamics grid layers possible) |
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nlevs = 0 |
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dpstar_accum = 0. |
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do L = 1,Nr |
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dpstar_accum = dpstar_accum + drF(L) |
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if(dpstar_accum.le.30000.) nlevs = nlevs+1 |
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enddo |
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numlevphys = Nr - nlevs + ntry + 1 |
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c |
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dptry_accum(1) = dptry(1) |
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do Lnew = 2,ntry |
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dptry_accum(Lnew) = dptry_accum(Lnew-1) + dptry(Lnew) |
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enddo |
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c |
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c do for each grid point: |
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do j = j1,j2 |
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do i = i1,i2 |
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Lbotij = Lbot(i,j,bi,bj) |
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c |
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c Find the maximum number of physics levels to fit in the bottom level |
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c |
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nlbotmax = 0 |
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do Lnew = 1,ntry |
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if ( (nlbotmax.eq.0) .and. |
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. (dptry_accum(Lnew).gt.(hfacC(i,j,Lbotij,bi,bj)*drF(Lbotij))))then |
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nlbotmax = Lnew |
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endif |
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enddo |
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if(nlbotmax.eq.0)then |
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nlbotmax = ntry |
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endif |
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c |
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c See how many of the physics levs can fit in the bottom level |
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c |
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nlphys = 0 |
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deltap = 0. |
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do Lnew = 1,nlbotmax |
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c Test to see if the next physics level fits, if yes, add it |
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if((hfacC(i,j,Lbotij,bi,bj)*drF(Lbotij)).ge. |
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. deltap+dptry(Lnew))then |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = dptry(Lnew) |
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deltap = deltap + dptry(Lnew) |
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else |
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c If the level does not fit, decide whether to make a new thinner |
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c one or make the one below a bit thicker |
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if((dptry(Lnew-1)+(hfacC(i,j,Lbotij,bi,bj)* |
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. drF(Lbotij)-deltap)) .gt. (dptry(Lnew-1)*1.5) ) then |
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c Add a new thin layer |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = |
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. (hfacC(i,j,Lbotij,bi,bj)*drF(Lbotij))-deltap |
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else |
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c Make the one below thicker |
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dpphys(i,j,nlphys,bi,bj) = dpphys(i,j,nlphys,bi,bj) + |
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. (hfacC(i,j,Lbotij,bi,bj)*drF(Lbotij)-deltap) |
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endif |
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deltap = deltap+(hfacC(i,j,Lbotij,bi,bj)*drF(Lbotij)-deltap) |
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endif |
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enddo |
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c |
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nlperdyn(i,j,Lbotij,bi,bj) = nlphys |
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c |
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c Now proceed upwards - see how many physics levels fit in each |
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c subsequent dynamics level - go through all 12 required levels |
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c |
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do L = Lbotij+1,Nr |
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ndone = 0 |
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if(nlphys.lt.ntry)then |
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deltap = 0. |
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nstart = nlphys + 1 |
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do Lnew = nstart,ntry |
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if((hfacC(i,j,L,bi,bj)*drF(L)).ge.deltap+dptry(Lnew))then |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = dptry(Lnew) |
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deltap = deltap + dptry(Lnew) |
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ndone = 0 |
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elseif (ndone.eq.0) then |
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c If the level does not fit, decide whether to make a new thinner |
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c one or make the one below a bit thicker |
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ndone = 1 |
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if( (dptry(Lnew-1)+(hfacC(i,j,L,bi,bj)*drF(L)-deltap)) |
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. .gt. (dptry(Lnew-1)*1.5) ) then |
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c Add a new thin layer |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = |
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. (hfacC(i,j,L,bi,bj)*drF(L))-deltap |
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deltap = hfacC(i,j,L,bi,bj)*drF(L) |
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else |
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c Make the one below thicker |
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dpphys(i,j,nlphys,bi,bj) = dpphys(i,j,nlphys,bi,bj) + |
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. (hfacC(i,j,L,bi,bj)*drF(L)-deltap) |
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deltap = hfacC(i,j,L,bi,bj)*drF(L) |
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endif |
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endif |
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enddo |
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C Need one more peice of logic - if we finished Lnew loop and |
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C now we are done adding new physics layers, we need to be sure |
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C that we are at the edge of a dynamics layer. if not, we need |
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C to add one more layer. |
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if(nlphys.ge.ntry)then |
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if(abs(deltap-hfacC(i,j,L-1,bi,bj)*drF(L-1)).gt.0.001)then |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = hfacC(i,j,L-1,bi,bj)*drF(L-1) |
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. - deltap |
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endif |
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endif |
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|
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elseif(nlphys.eq.ntry)then |
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c Mostly done with new layers - make sure we end at dynamics edge, |
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c if not, make one more thinner (thinner than dyn grid) layer |
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if(abs(deltap-hfacC(i,j,L-1,bi,bj)*drF(L-1)).gt.0.001)then |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = hfacC(i,j,L-1,bi,bj)*drF(L-1) |
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. - deltap |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = hfacC(i,j,L,bi,bj)*drF(L) |
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else |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = hfacC(i,j,L,bi,bj)*drF(L) |
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endif |
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else |
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c we are done adding new physics layers, just copy the rest |
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c of the dynamics grid onto the physics grid |
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nlphys = nlphys + 1 |
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dpphys(i,j,nlphys,bi,bj) = hfacC(i,j,L,bi,bj)*drF(L) |
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endif |
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nlperdyn(i,j,L,bi,bj) = nlphys |
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enddo |
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c |
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c All done adding layers - if we need more to make numlevphys, put |
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c them as thin (0.1 mb) layers near the top |
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if(nlphys.lt.numlevphys)then |
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nlevs = numlevphys-nlphys |
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dpphys(i,j,nlphys,bi,bj) = dpphys(i,j,nlphys,bi,bj)-10. * nlevs |
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do Lnew = nlphys+1,numlevphys |
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dpphys(i,j,Lnew,bi,bj) = 10. |
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enddo |
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nlperdyn(i,j,Nr,bi,bj) = numlevphys |
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endif |
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c END OF LOOP OVER GRID POINTS |
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|
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enddo |
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enddo |
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|
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return |
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end |
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