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c $Header: /u/gcmpack/MITgcm/pkg/exf/exf_wind.F,v 1.2 2006/05/30 22:47:08 mlosch Exp $ |
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|
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#include "EXF_OPTIONS.h" |
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|
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subroutine exf_wind(mytime, myiter, mythid) |
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|
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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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|
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implicit none |
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|
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c == global variables == |
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|
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#include "EEPARAMS.h" |
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#include "SIZE.h" |
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#include "PARAMS.h" |
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#include "DYNVARS.h" |
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#include "GRID.h" |
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|
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#include "exf_param.h" |
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#include "exf_fields.h" |
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#include "exf_constants.h" |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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#include "tamc.h" |
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#endif |
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|
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c == routine arguments == |
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|
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integer mythid |
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integer myiter |
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_RL mytime |
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|
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c == local variables == |
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|
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integer bi,bj |
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integer i,j,k |
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|
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_RL ustmp |
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_RL ustar |
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|
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c == external functions == |
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|
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integer ilnblnk |
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external ilnblnk |
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|
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_RL tmp1 |
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_RL tmp2 |
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_RL tmp3 |
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_RL tmp4 |
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_RL tmp5 |
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|
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c == end of interface == |
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|
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c-- Use atmospheric state to compute surface fluxes. |
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|
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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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k = 1 |
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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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|
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ustmp = ustress(i,j,bi,bj)*ustress(i,j,bi,bj) + |
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& vstress(i,j,bi,bj)*vstress(i,j,bi,bj) |
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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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|
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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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tmp1 = -cquadrag_2/cquadrag_1/2 |
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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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tmp3 = clindrag_2/clindrag_1/3 |
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tmp4 = ustar*ustar/clindrag_1/2 - tmp3**3 |
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tmp5 = sqrt(ustar*ustar/clindrag_1* |
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& (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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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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c |
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#endif /* ifndef ALLOW_ATM_WIND */ |
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|
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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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|
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c-- if wspeed available, overwrite sh, |
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c-- otherwise fill wspeed array for later use |
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if ( wspeedfile .NE. ' ' ) then |
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us(i,j,bi,bj) = wspeed(i,j,bi,bj) |
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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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|
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enddo |
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enddo |
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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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