subroutine interpolateH2Ocont(wn,temp,presS,presF,abcoef,firstcall) implicit none !================================================================== ! ! Purpose ! ------- ! Calculates the H2O continuum opacity, using a lookup table from ! Clough (2005) ! ! Authors ! ------- ! R. Wordsworth (2011) ! !================================================================== #include "datafile.h" ! input double precision wn ! wavenumber (cm^-1) double precision temp ! temperature (Kelvin) double precision presS ! self-pressure (Pascals) double precision presF ! foreign (air) pressure (Pascals) ! output double precision abcoef ! absorption coefficient (m^-1) integer nS,nT parameter(nS=1001) parameter(nT=11) double precision kB parameter(kB=1.3806488e-23) double precision amagatS, amagatF, abcoefS, abcoefF, Nmolec double precision wn_arr(nS) double precision temp_arr(nT) double precision abs_arrS(nS,nT) double precision abs_arrF(nS,nT) double precision data_tmp(nT) integer k logical firstcall save wn_arr, temp_arr, abs_arrS, abs_arrF character*100 dt_file integer strlen,ios amagatS=(273.15/temp)*(presS/101325.0) amagatF=(273.15/temp)*(presF/101325.0) if(firstcall)then ! 1.1 Open the ASCII files ! nu array dt_file=datafile(1:LEN_TRIM(datafile))//'/continuum_data/H2O_CONT_NU.dat' open(33,file=dt_file,form='formatted',status='old',iostat=ios) if (ios.ne.0) then ! file not found write(*,*) 'Error from interpolateH2O_cont.for' write(*,*) 'Data file could not be found:' write(*,*) dt_file call abort else do k=1,nS read(33,*) wn_arr(k) enddo endif close(33) ! self broadening dt_file=datafile(1:LEN_TRIM(datafile))//'/continuum_data/H2O_CONT_SELF.dat' open(34,file=dt_file,form='formatted',status='old',iostat=ios) if (ios.ne.0) then ! file not found write(*,*) 'Error from interpolateH2O_cont.for' write(*,*) 'Data file could not be found:' write(*,*) dt_file call abort else do k=1,nS read(34,*) data_tmp abs_arrS(k,1:nT)=data_tmp(1:nT) end do endif close(34) ! foreign (N2+O2+Ar) broadening dt_file=datafile(1:LEN_TRIM(datafile))//'/continuum_data/H2O_CONT_FOREIGN.dat' open(35,file=dt_file,form='formatted',status='old',iostat=ios) if (ios.ne.0) then ! file not found write(*,*) 'Error from interpolateH2O_cont.for' write(*,*) 'Data file could not be found:' write(*,*) dt_file call abort else do k=1,nS read(35,*) data_tmp abs_arrF(k,1:nT)=data_tmp(1:nT) end do endif close(35) temp_arr(1) = 200. temp_arr(2) = 250. temp_arr(3) = 300. temp_arr(4) = 350. temp_arr(5) = 400. temp_arr(6) = 450. temp_arr(7) = 500. temp_arr(8) = 550. temp_arr(9) = 600. temp_arr(10) = 650. temp_arr(11) = 700. print*,'At wavenumber ',wn,' cm^-1' print*,' temperature ',temp,' K' print*,' H2O pressure ',presS,' Pa' print*,' air pressure ',presF,' Pa' call bilinearH2Ocont(wn_arr,temp_arr,abs_arrS,wn,temp,abcoefS) print*,'the self absorption is ',abcoefS,' cm^2 molecule^-1' call bilinearH2Ocont(wn_arr,temp_arr,abs_arrF,wn,temp,abcoefF) print*,'the foreign absorption is ',abcoefF,' cm^2 molecule^-1' print*,'We have ',amagatS,' amagats of H2O vapour' print*,'and ',amagatF,' amagats of air' abcoef = abcoefS*amagatS + abcoefF*amagatF ! Eq. (15) in Clough (1989) Nmolec = (presS+presF)/(kB*temp) print*,'Total number of molecules per m^3 is',Nmolec abcoef = abcoef*Nmolec/(100.0**2) ! convert to m^-1 abcoef = abcoef*(presS/(presF+presS)) ! take H2O mixing ratio into account print*,'So the total absorption is ',abcoef,' m^-1' print*,'And optical depth / km : ',1000.0*abcoef else call bilinearH2Ocont(wn_arr,temp_arr,abs_arrS,wn,temp,abcoefS) call bilinearH2Ocont(wn_arr,temp_arr,abs_arrF,wn,temp,abcoefF) abcoef = abcoefS*amagatS + abcoefF*amagatF ! Eq. (15) in Clough (1989) !abcoef = (presS/100000.0)*3.0e-24 !print*,'Matsui TEST' Nmolec = (presS+presF)/(kB*temp) ! sure this is correct?? abcoef = abcoef*Nmolec/(100.0**2) ! convert to m^-1 abcoef = abcoef*(presS/(presF+presS)) ! take H2O mixing ratio into account ! unlike for Rayleigh scattering, we do not currently weight by the BB function ! however our bands are normally thin, so this is no big deal. endif return end subroutine interpolateH2Ocont !------------------------------------------------------------------------- subroutine bilinearH2Ocont(x_arr,y_arr,f2d_arr,x_in,y_in,f) ! Necessary for interpolation of continuum data implicit none integer nX,nY,i,j,a,b parameter(nX=1001) parameter(nY=11) real*8 x_in,y_in,x,y,x1,x2,y1,y2 real*8 f,f11,f12,f21,f22,fA,fB real*8 x_arr(nX) real*8 y_arr(nY) real*8 f2d_arr(nX,nY) integer strlen character*100 label label='subroutine bilinear' x=x_in y=y_in ! 1st check we're within the wavenumber range if ((x.lt.x_arr(2)).or.(x.gt.x_arr(nX-2))) then f=0.0D+0 return else ! in the x (wavenumber) direction 1st i=1 10 if (i.lt.(nX+1)) then if (x_arr(i).gt.x) then x1=x_arr(i-1) x2=x_arr(i) a=i-1 i=9999 endif i=i+1 goto 10 endif endif if ((y.lt.y_arr(1)).or.(y.gt.y_arr(nY))) then write(*,*) 'Warning from bilinear.for:' write(*,*) 'Outside continuum temperature range!' if(y.lt.y_arr(1))then y=y_arr(1)+0.01 endif if(y.gt.y_arr(nY))then y=y_arr(nY)-0.01 endif else ! in the y (temperature) direction 2nd j=1 20 if (j.lt.(nY+1)) then if (y_arr(j).gt.y) then y1=y_arr(j-1) y2=y_arr(j) b=j-1 j=9999 endif j=j+1 goto 20 endif endif f11=f2d_arr(a,b) f21=f2d_arr(a+1,b) f12=f2d_arr(a,b+1) f22=f2d_arr(a+1,b+1) ! 1st in x-direction fA=f11*(x2-x)/(x2-x1)+f21*(x-x1)/(x2-x1) fB=f12*(x2-x)/(x2-x1)+f22*(x-x1)/(x2-x1) ! then in y-direction f=fA*(y2-y)/(y2-y1)+fB*(y-y1)/(y2-y1) return end subroutine bilinearH2Ocont