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#include "ctrparam.h" |
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|
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! ============================================================ |
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! |
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! CHEMEDDY.F: Subroutine for calculating zonal-average eddy |
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! diffusion of MIT Global Chemistry Model |
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! |
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! ------------------------------------------------------------ |
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! |
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! Author: Chien Wang |
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! MIT Joint Program on Science and Policy |
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! of Global Change |
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! |
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! ---------------------------------------------------------- |
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! |
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! Revision History: |
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! |
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! When Who What |
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! ---- ---------- ------- |
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! 013096 Chien Wang rev. |
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! 080100 Chien Wang repack based on CliChem3 & add cpp |
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! 051804 Chien Wang rev. for 46x11 |
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! |
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! ========================================================== |
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Subroutine chemeddy(ifdiff,x00,x11,dta) |
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|
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#include "chem_para" |
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#include "chem_com" |
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#include "BD2G04.COM" |
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|
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dimension x00 (nlon,nlat,nlev) |
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dimension x11 (nlon,nlat,nlev) |
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|
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dimension vc (nlat,nlev) |
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dimension beta5(nlat) |
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|
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dimension dcdy(nlat,nlev) |
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dimension dcdz(nlat,nlev) |
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dimension dcdc(nlat,nlev) |
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|
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! ---------------------------------------------------------- |
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|
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#if ( defined CPL_CHEM ) |
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|
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c------------------------------------------------------- |
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c Definitions of parameters: |
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c |
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istart=1 |
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iend =nlon |
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|
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beta5(1)=0.0 |
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do j=2,nlat1 |
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beta5(j)=0.573*sqrt(beta2(j))/(1.-0.427*beta2(j)**0.302) |
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end do |
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beta5(nlat)=0.0 |
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|
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c===== |
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c Calculate dcdy and dcdz: |
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c |
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do 5 i=istart,iend |
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do 5 j=2,nlat |
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do 5 k=1,nlev |
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dcdy(j,k)=(x11(i,j,k)-x11(i,j-1,k))/dyv(j) |
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5 continue |
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|
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do 6 i=istart,iend |
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do 6 j=1,nlat |
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do 6 k=1,nlev1 |
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dcdz(j,k)=-(x11(i,j,k+1)-x11(i,j,k))*deltap(j,k) |
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6 continue |
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|
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do 61 i=istart,iend |
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do 61 j=1,nlat |
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do 62 k=2,nlev |
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dcdz(j,k)=dcdz(j,k-1)*dp2dz(j,k-1) |
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62 continue |
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dcdz(j,1)=dcdz(j,2) |
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61 continue |
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|
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do 7 j=2,nlat1 |
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do 7 k=2,nlev1 |
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dcdc(j,k)=dcdz(j,k)*4.0 |
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& /(dcdy(j,k) +dcdy(j+1,k) |
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& +dcdy(j,k+1)+dcdy(j+1,k+1)+1.e-20) |
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7 continue |
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|
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do 8 j=2,nlat1 |
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alamor =beta5(j)/beta2(j) |
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alamor2 =alamor /beta2(j) |
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oneoalam1=1./(1.+beta5(j)) |
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do 8 k=2,nlev1 |
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dcdc(j,k)=oneoalam1*beta1(j)*beta3(j,k) |
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& *(1.0+alamor |
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& +beta3(j,k)*0.25*beta1(j)*dcdc(j,k) |
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& *(1.+alamor2)) |
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8 continue |
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|
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c===== |
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c Calculate meridional eddy diffusion: |
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c |
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do 10 k=1,nlev |
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paver = 0.5*(p00(1,1)+p00(1,2)) |
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fluxl =-fkt(2,k) |
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& /dyv(2)*dcdy(2,k)*dta |
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& * paver |
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fluxl=max(-0.5*x00(1,2,k),min(0.5*x00(1,1, k),fluxl)) |
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vc(2,k)=fluxl/(paver+1.e-20) |
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do 11 j=2,nlat1 |
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paver = 0.5*(p00(1,j)+p00(1,j+1)) |
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fluxr =-fkt(j+1,k) |
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& /dyv(j+1)*dcdy(j+1,k)*dta |
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& * paver |
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fluxr=max(-0.5*x00(1,j+1,k),min(0.5*x00(1,j,k),fluxr)) |
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vc (j+1,k)=fluxr/(paver+1.e-20) |
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x00(1,j,k)=x00(1,j,k)-(fluxr-fluxl) |
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fluxl=fluxr |
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11 continue |
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10 continue |
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|
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c===== |
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c Calculate vertical eddy diffusion: |
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c |
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c 112696 changed also in eddypa.f for beta4 |
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c |
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do 12 j=2,nlat1 |
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fluxb=0.0 |
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do 14 k=1,n_tropopause ! ktrop = 7 for both 9 and 11 layer model |
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fluxt=0.25*(vc(j,k)+vc(j,k+1)+vc(j+1,k)+vc(j+1,k+1)) |
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& *dcdc(j,k+1) |
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& *beta4(j,k+1) |
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& *p00(1,j) |
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|
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c fluxt=max(-0.5*x00(1,j,k) *dsig(k), |
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c & min( 0.5*x00(1,j,k+1)*dsig(k+1),fluxt)) |
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c if(fluxt*dcdz(j,k+1).lt.0.0) fluxt=0.0 |
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c x00(1,j,k)=x00(1,j,k)+(fluxt-fluxb)/dsig(k) |
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|
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fluxt=max(-0.5*x00(1,j,k+1)*dsig(k+1), |
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& min( 0.5*x00(1,j,k) *dsig(k),fluxt)) |
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if(fluxt*dcdz(j,k+1).gt.0.0) fluxt=0.0 |
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x00(1,j,k)=x00(1,j,k)-(fluxt-fluxb)/dsig(k) |
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fluxb=fluxt |
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14 continue |
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12 continue |
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|
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c write(6,*)"FKT = " |
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c write(6,*)fkt |
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c write(6,*)"VC = " |
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c write(6,*)vc |
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c write(6,*)"DCDY = " |
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c write(6,*)dcdy |
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c |
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c 040895 test: |
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c |
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|
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1996 continue |
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|
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c ====== |
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c 013096 |
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c Apply horizontal diffussion to some tracers |
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c to reduce initialization errors in the |
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c global distribution: |
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c |
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if(ifdiff.ne.0) call chemdiff(ifdiff,x00,x11,dta) |
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call chemcheck(x00) |
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#endif |
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|
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return |
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end |
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