[e200b7a] | 1 | subroutine ohreaction(itime,ltsample,loutnext) |
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| 2 | ! i i i |
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| 3 | !***************************************************************************** |
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| 4 | ! * |
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| 5 | ! * |
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[8a65cb0] | 6 | ! Author: R.L. Thompson * |
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[e200b7a] | 7 | ! * |
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[8a65cb0] | 8 | ! Nov 2014 * |
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[e200b7a] | 9 | ! * |
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| 10 | ! * |
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| 11 | !***************************************************************************** |
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| 12 | ! Variables: * |
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[8a65cb0] | 13 | ! ix,jy indices of output grid cell for each particle * |
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| 14 | ! itime [s] actual simulation time [s] * |
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| 15 | ! jpart particle index * |
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| 16 | ! ldeltat [s] interval since radioactive decay was computed * |
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| 17 | ! loutnext [s] time for which gridded deposition is next output * |
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| 18 | ! loutstep [s] interval at which gridded deposition is output * |
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| 19 | ! oh_average [molecule/cm^3] OH Concentration * |
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| 20 | ! ltsample [s] interval over which mass is deposited * |
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[e200b7a] | 21 | ! * |
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| 22 | !***************************************************************************** |
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| 23 | |
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| 24 | use oh_mod |
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| 25 | use par_mod |
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| 26 | use com_mod |
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| 27 | |
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| 28 | implicit none |
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| 29 | |
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[8a65cb0] | 30 | integer :: jpart,itime,ltsample,loutnext,ldeltat,j,k,ix,jy!,ijx,jjy |
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| 31 | integer :: ngrid,interp_time,n,m,h,indz,i!,ia,il |
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| 32 | integer :: jjjjmmdd,hhmmss,OHx,OHy,OHz |
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| 33 | real, dimension(nzOH) :: altOHtop |
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| 34 | real :: xlon,ylat |
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| 35 | real :: xtn,ytn |
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| 36 | real :: restmass,ohreacted,oh_average |
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| 37 | real :: ohrate,temp |
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| 38 | real, parameter :: smallnum = tiny(0.0) ! smallest number that can be handled |
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[e200b7a] | 39 | real(kind=dp) :: jul |
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| 40 | |
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| 41 | ! Compute interval since radioactive decay of deposited mass was computed |
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| 42 | !************************************************************************ |
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| 43 | |
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| 44 | if (itime.le.loutnext) then |
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| 45 | ldeltat=itime-(loutnext-loutstep) |
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| 46 | else ! first half of next interval |
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| 47 | ldeltat=itime-loutnext |
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| 48 | endif |
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| 49 | |
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[8a65cb0] | 50 | jul=bdate+real(itime,kind=dp)/86400. |
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| 51 | call caldate(jul,jjjjmmdd,hhmmss) |
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| 52 | m=(jjjjmmdd-(jjjjmmdd/10000)*10000)/100 |
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| 53 | h=hhmmss/10000 |
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[e200b7a] | 54 | |
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[8a65cb0] | 55 | ! Loop over particles |
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[e200b7a] | 56 | !***************************************** |
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| 57 | |
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[8a65cb0] | 58 | do jpart=1,numpart |
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| 59 | |
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| 60 | ! Determine which nesting level to be used |
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[e200b7a] | 61 | ngrid=0 |
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| 62 | do j=numbnests,1,-1 |
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| 63 | if ((xtra1(jpart).gt.xln(j)).and.(xtra1(jpart).lt.xrn(j)).and. & |
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| 64 | (ytra1(jpart).gt.yln(j)).and.(ytra1(jpart).lt.yrn(j))) then |
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| 65 | ngrid=j |
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| 66 | goto 23 |
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| 67 | endif |
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| 68 | end do |
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[8a65cb0] | 69 | 23 continue |
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[e200b7a] | 70 | |
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[8a65cb0] | 71 | ! Determine nested grid coordinates |
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[e200b7a] | 72 | if (ngrid.gt.0) then |
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| 73 | xtn=(xtra1(jpart)-xln(ngrid))*xresoln(ngrid) |
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| 74 | ytn=(ytra1(jpart)-yln(ngrid))*yresoln(ngrid) |
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| 75 | ix=int(xtn) |
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| 76 | jy=int(ytn) |
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| 77 | else |
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| 78 | ix=int(xtra1(jpart)) |
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| 79 | jy=int(ytra1(jpart)) |
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| 80 | endif |
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| 81 | |
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[8a65cb0] | 82 | interp_time=nint(itime-0.5*ltsample) |
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| 83 | n=2 |
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| 84 | if(abs(memtime(1)-interp_time).lt.abs(memtime(2)-interp_time)) n=1 |
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[e200b7a] | 85 | |
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[8a65cb0] | 86 | do i=2,nz |
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| 87 | if (height(i).gt.ztra1(jpart)) then |
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| 88 | indz=i-1 |
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| 89 | goto 6 |
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| 90 | endif |
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| 91 | end do |
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[e200b7a] | 92 | 6 continue |
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| 93 | |
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[8a65cb0] | 94 | ! Get OH from nearest grid-cell and specific month |
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| 95 | !************************************************* |
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[e200b7a] | 96 | |
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[8a65cb0] | 97 | ! world coordinates |
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[e200b7a] | 98 | xlon=xtra1(jpart)*dx+xlon0 |
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| 99 | if (xlon.gt.180) then |
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| 100 | xlon=xlon-360 |
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| 101 | endif |
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| 102 | ylat=ytra1(jpart)*dy+ylat0 |
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| 103 | |
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[8a65cb0] | 104 | ! get position in the OH field |
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| 105 | OHx=minloc(abs(lonOH-xlon),dim=1,mask=abs(lonOH-xlon).eq.minval(abs(lonOH-xlon))) |
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| 106 | OHy=minloc(abs(latOH-ylat),dim=1,mask=abs(latOH-ylat).eq.minval(abs(latOH-ylat))) |
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| 107 | |
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| 108 | ! get the level of the OH field for the particle |
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| 109 | ! ztra1 is the z-coord of the trajectory above model orography in metres |
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| 110 | ! altOH is the height of the centre of the level in the OH field above orography |
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| 111 | do i=2,nzOH |
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| 112 | altOHtop(i-1)=altOH(i)+0.5*(altOH(i)-altOH(i-1)) |
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| 113 | end do |
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| 114 | altOHtop(nzOH)=altOH(nzOH)+0.5*(altOH(nzOH)-altOH(nzOH-1)) |
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| 115 | OHz=minloc(abs(altOHtop-ztra1(jpart)),dim=1,mask=abs(altOHtop-ztra1(jpart))& |
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| 116 | &.eq.minval(abs(altOHtop-ztra1(jpart)))) |
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| 117 | |
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| 118 | ! Interpolate between hourly OH fields to current time |
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| 119 | !***************************************************** |
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| 120 | |
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| 121 | oh_average=OH_hourly(OHx,OHy,OHz,1)+& |
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| 122 | &(OH_hourly(OHx,OHy,OHz,2)-OH_hourly(OHx,OHy,OHz,1))*& |
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| 123 | &(itime-memOHtime(1))/(memOHtime(2)-memOHtime(1)) |
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[e200b7a] | 124 | |
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| 125 | if (oh_average.gt.smallnum) then |
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[8a65cb0] | 126 | |
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| 127 | ! Computation of the OH reaction |
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| 128 | !********************************************************** |
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| 129 | |
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| 130 | temp=tt(ix,jy,indz,n) |
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| 131 | |
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| 132 | do k=1,nspec |
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| 133 | if (ohcconst(k).gt.0.) then |
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[78e62dc] | 134 | ohrate=ohcconst(k)*temp**ohnconst(k)*exp(-ohdconst(k)/temp)*oh_average |
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[8a65cb0] | 135 | ! new particle mass |
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| 136 | restmass = xmass1(jpart,k)*exp(-1*ohrate*abs(ltsample)) |
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| 137 | if (restmass .gt. smallnum) then |
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| 138 | xmass1(jpart,k)=restmass |
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| 139 | else |
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| 140 | xmass1(jpart,k)=0. |
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| 141 | endif |
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| 142 | ohreacted=xmass1(jpart,k)*(1-exp(-1*ohrate*abs(ltsample))) |
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[e200b7a] | 143 | else |
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[8a65cb0] | 144 | ohreacted=0. |
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[e200b7a] | 145 | endif |
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[8a65cb0] | 146 | end do |
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| 147 | |
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| 148 | endif ! oh_average.gt.smallnum |
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| 149 | |
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| 150 | end do !continue loop over all particles |
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[e200b7a] | 151 | |
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| 152 | |
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| 153 | end subroutine ohreaction |
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[8a65cb0] | 154 | |
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