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jmc |
1.8 |
C $Header: /u/gcmpack/MITgcm/pkg/exf/exf_wind.F,v 1.7 2007/03/08 15:09:52 mlosch Exp $ |
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jmc |
1.4 |
C $Name: $ |
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heimbach |
1.1 |
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#include "EXF_OPTIONS.h" |
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subroutine exf_wind(mytime, myiter, mythid) |
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c ================================================================== |
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c SUBROUTINE exf_wind |
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c ================================================================== |
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c |
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c o Prepare wind speed and stress fields |
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c |
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c ================================================================== |
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c SUBROUTINE exf_wind |
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c ================================================================== |
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implicit none |
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c == global variables == |
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jmc |
1.4 |
#include "SIZE.h" |
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heimbach |
1.1 |
#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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jmc |
1.4 |
c #include "DYNVARS.h" |
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c #include "GRID.h" |
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heimbach |
1.1 |
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jmc |
1.8 |
#include "EXF_PARAM.h" |
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#include "EXF_FIELDS.h" |
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#include "EXF_CONSTANTS.h" |
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heimbach |
1.1 |
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#ifdef ALLOW_AUTODIFF_TAMC |
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#include "tamc.h" |
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#endif |
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c == routine arguments == |
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integer mythid |
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integer myiter |
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_RL mytime |
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c == local variables == |
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integer bi,bj |
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jmc |
1.4 |
integer i,j |
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heimbach |
1.1 |
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_RL ustmp |
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mlosch |
1.5 |
_RL ustar |
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_RL tmp1, tmp2, tmp3, tmp4, tmp5 |
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heimbach |
1.1 |
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c == external functions == |
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integer ilnblnk |
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external ilnblnk |
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c == end of interface == |
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c-- Use atmospheric state to compute surface fluxes. |
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c Loop over tiles. |
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do bj = mybylo(mythid),mybyhi(mythid) |
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do bi = mybxlo(mythid),mybxhi(mythid) |
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do j = 1,sny |
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do i = 1,snx |
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c |
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c-- Initialise |
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us(i,j,bi,bj) = 0. _d 0 |
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cw(i,j,bi,bj) = 0. _d 0 |
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sw(i,j,bi,bj) = 0. _d 0 |
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sh(i,j,bi,bj) = 0. _d 0 |
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c |
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#ifdef ALLOW_ATM_WIND |
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c Wind speed and direction. |
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ustmp = uwind(i,j,bi,bj)*uwind(i,j,bi,bj) + |
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& vwind(i,j,bi,bj)*vwind(i,j,bi,bj) |
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if ( ustmp .ne. 0. _d 0 ) then |
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us(i,j,bi,bj) = sqrt(ustmp) |
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cw(i,j,bi,bj) = uwind(i,j,bi,bj)/us(i,j,bi,bj) |
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sw(i,j,bi,bj) = vwind(i,j,bi,bj)/us(i,j,bi,bj) |
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else |
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us(i,j,bi,bj) = 0. _d 0 |
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cw(i,j,bi,bj) = 0. _d 0 |
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sw(i,j,bi,bj) = 0. _d 0 |
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endif |
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#else /* ifndef ALLOW_ATM_WIND */ |
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c |
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c The variables us, sh and rdn have to be computed from |
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c given wind stresses inverting relationship for neutral |
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c drag coeff. cdn. |
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c The inversion is based on linear and quadratic form of |
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c cdn(umps); ustar can be directly computed from stress; |
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jmc |
1.4 |
C- no need for wind-stress inversion since everything |
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C (ustar, ... etc ...) is derived directly from wind-stress |
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heimbach |
1.1 |
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mlosch |
1.6 |
ustmp = 0.5* |
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& (ustress(i, j,bi,bj)*ustress(i ,j,bi,bj) |
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& +ustress(i+1,j,bi,bj)*ustress(i+1,j,bi,bj) |
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& +vstress(i,j, bi,bj)*vstress(i,j ,bi,bj) |
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& +vstress(i,j+1,bi,bj)*vstress(i,j+1,bi,bj)) |
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mlosch |
1.5 |
if ( ustmp .ne. 0. _d 0 ) then |
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ustar = sqrt(ustmp/atmrho) |
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cw(i,j,bi,bj) = ustress(i,j,bi,bj)/sqrt(ustmp) |
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sw(i,j,bi,bj) = vstress(i,j,bi,bj)/sqrt(ustmp) |
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else |
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ustar = 0. _d 0 |
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cw(i,j,bi,bj) = 0. _d 0 |
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sw(i,j,bi,bj) = 0. _d 0 |
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endif |
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if ( ustar .eq. 0. _d 0 ) then |
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us(i,j,bi,bj) = 0. _d 0 |
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else if ( ustar .lt. ustofu11 ) then |
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mlosch |
1.6 |
tmp1 = -cquadrag_2/cquadrag_1/2. |
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mlosch |
1.5 |
tmp2 = sqrt(tmp1*tmp1 + ustar*ustar/cquadrag_1) |
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us(i,j,bi,bj) = sqrt(tmp1 + tmp2) |
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else |
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mlosch |
1.6 |
tmp3 = clindrag_2/clindrag_1/3. |
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tmp4 = ustar*ustar/clindrag_1/2. - tmp3**3 |
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mlosch |
1.5 |
tmp5 = sqrt(ustar*ustar/clindrag_1* |
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mlosch |
1.6 |
& (ustar*ustar/clindrag_1/4. - tmp3**3)) |
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us(i,j,bi,bj) = (tmp4 + tmp5)**(1./3.) + |
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& tmp3**2 * (tmp4 + tmp5)**(-1./3.) - tmp3 |
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mlosch |
1.5 |
endif |
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uwind(i,j,bi,bj) = us(i,j,bi,bj)*cw(i,j,bi,bj) |
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vwind(i,j,bi,bj) = us(i,j,bi,bj)*sw(i,j,bi,bj) |
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heimbach |
1.1 |
#endif /* ifndef ALLOW_ATM_WIND */ |
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c-- set lower limit |
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sh(i,j,bi,bj) = max(us(i,j,bi,bj),umin) |
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jmc |
1.4 |
c-- if wspeed available, overwrite sh, |
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heimbach |
1.1 |
c-- otherwise fill wspeed array for later use |
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if ( wspeedfile .NE. ' ' ) then |
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mlosch |
1.2 |
us(i,j,bi,bj) = wspeed(i,j,bi,bj) |
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heimbach |
1.1 |
sh(i,j,bi,bj) = max(wspeed(i,j,bi,bj),umin) |
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else |
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wspeed(i,j,bi,bj) = sh(i,j,bi,bj) |
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endif |
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enddo |
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enddo |
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enddo |
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enddo |
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mlosch |
1.3 |
return |
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heimbach |
1.1 |
end |
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