Changes in src/wetdepo.f90 [0539b8f:c8fc724] in flexpart.git

File:

• src/wetdepo.f90 (modified) (6 diffs)

src/wetdepo.f90

@@ -42 +42 @@
 !                                                                            *
 ! Variables:                                                                 *
+! cc [0-1]           total cloud cover                                       *
+! convp [mm/h]       convective precipitation rate                           *
+! grfraction [0-1]   fraction of grid, for which precipitation occurs        *
 ! ix,jy              indices of output grid cell for each particle           *
 ! itime [s]          actual simulation time [s]                              *
 ! jpart              particle index                                          *
 ! ldeltat [s]        interval since radioactive decay was computed           *
+! lfr, cfr           area fraction covered by precipitation for large scale  *
+!                    and convective precipitation (dependent on prec. rate)  *
 ! loutnext [s]       time for which gridded deposition is next output        *
 ! loutstep [s]       interval at which gridded deposition is output          *
+! lsp [mm/h]         large scale precipitation rate                          *
 ! ltsample [s]       interval over which mass is deposited                   *
+! prec [mm/h]        precipitation rate in subgrid, where precipitation occurs*
 ! wetdeposit         mass that is wet deposited                              *
 ! wetgrid            accumulated deposited mass on output grid               *
@@ -64 +71 @@
 
   integer :: jpart,itime,ltsample,loutnext,ldeltat,i,j,ix,jy
-  integer :: itage,nage,il,interp_time, n
+  integer :: ngrid,itage,nage,hz,il,interp_time, n
+  integer(kind=1) :: clouds_v
   integer :: ks, kp
-  integer :: blc_count, inc_count 
-  real :: grfraction(3),wetscav
+!  integer :: n1,n2, icbot,ictop, indcloud !TEST
+  real :: S_i, act_temp, cl, cle ! in cloud scavenging
+  real :: clouds_h ! cloud height for the specific grid point
+  real :: xtn,ytn,lsp,convp,cc,grfraction(3),prec(3),wetscav,totprec
   real :: wetdeposit(maxspec),restmass
   real,parameter :: smallnum = tiny(0.0) ! smallest number that can be handled
+!save lfr,cfr
+
+  real, parameter :: lfr(5) = (/ 0.5,0.65,0.8,0.9,0.95/)
+  real, parameter :: cfr(5) = (/ 0.4,0.55,0.7,0.8,0.9 /)
+
+!ZHG aerosol below-cloud scavenging removal polynomial constants for rain and snow
+  real, parameter :: bclr(6) = (/274.35758, 332839.59273, 226656.57259, 58005.91340, 6588.38582, 0.244984/) !rain (Laakso et al 2003)
+  real, parameter :: bcls(6) = (/22.7, 0.0, 0.0, 1321.0, 381.0, 0.0/) !now (Kyro et al 2009)
+  real :: frac_act, liq_frac, dquer_m
+
+  integer(selected_int_kind(16)), dimension(nspec) :: blc_count, inc_count
+  real    :: Si_dummy, wetscav_dummy
+  logical :: readclouds_this_nest
+
 
 ! Compute interval since radioactive decay of deposited mass was computed
@@ -83 +107 @@
 !************************
 
-  blc_count=0
-  inc_count=0
+  blc_count(:)=0
+  inc_count(:)=0
 
   do jpart=1,numpart
@@ -95 +119 @@
     endif
 
-! Determine age class of the particle - nage is used for the kernel
+! Determine age class of the particle
+    itage=abs(itra1(jpart)-itramem(jpart))
+    do nage=1,nageclass
+      if (itage.lt.lage(nage)) goto 33
+    end do
+33  continue
+
+
+! Determine which nesting level to be used
+!*****************************************
+
+    ngrid=0
+    do j=numbnests,1,-1
+      if ((xtra1(jpart).gt.xln(j)).and.(xtra1(jpart).lt.xrn(j)).and. &
+           (ytra1(jpart).gt.yln(j)).and.(ytra1(jpart).lt.yrn(j))) then
+        ngrid=j
+        goto 23
+      endif
+    end do
+23  continue
+
+
+! Determine nested grid coordinates
+!**********************************
+    readclouds_this_nest=.false.
+
+    if (ngrid.gt.0) then
+      xtn=(xtra1(jpart)-xln(ngrid))*xresoln(ngrid)
+      ytn=(ytra1(jpart)-yln(ngrid))*yresoln(ngrid)
+      ix=int(xtn)
+      jy=int(ytn)
+      if (readclouds_nest(ngrid)) readclouds_this_nest=.true.
+    else
+      ix=int(xtra1(jpart))
+      jy=int(ytra1(jpart))
+    endif
+
+
+! Interpolate large scale precipitation, convective precipitation and
+! total cloud cover
+! Note that interpolated time refers to itime-0.5*ltsample [PS]
+!********************************************************************
+    interp_time=nint(itime-0.5*ltsample)
+
+    if (ngrid.eq.0) then
+      call interpol_rain(lsprec,convprec,tcc,nxmax,nymax, &
+           1,nx,ny,memind,real(xtra1(jpart)),real(ytra1(jpart)),1, &
+           memtime(1),memtime(2),interp_time,lsp,convp,cc)
+    else
+      call interpol_rain_nests(lsprecn,convprecn,tccn, &
+           nxmaxn,nymaxn,1,maxnests,ngrid,nxn,nyn,memind,xtn,ytn,1, &
+           memtime(1),memtime(2),interp_time,lsp,convp,cc)
+    endif
+
+!  If total precipitation is less than 0.01 mm/h - no scavenging occurs
+    if ((lsp.lt.0.01).and.(convp.lt.0.01)) goto 20
+
+! get the level were the actual particle is in
+    do il=2,nz
+      if (height(il).gt.ztra1(jpart)) then
+        hz=il-1
+!        goto 26
+        exit
+      endif
+    end do
+!26  continue
+
+    n=memind(2)
+    if (abs(memtime(1)-interp_time).lt.abs(memtime(2)-interp_time)) &
+         n=memind(1)
+
+    if (ngrid.eq.0) then
+      clouds_v=clouds(ix,jy,hz,n)
+      clouds_h=cloudsh(ix,jy,n)
+    else
+      clouds_v=cloudsn(ix,jy,hz,n,ngrid)
+      clouds_h=cloudshn(ix,jy,n,ngrid)
+    endif
+
+! if there is no precipitation or the particle is above the clouds no
+! scavenging is done
+
+    if (clouds_v.le.1) goto 20
+
+! 1) Parameterization of the the area fraction of the grid cell where the
+!    precipitation occurs: the absolute limit is the total cloud cover, but
+!    for low precipitation rates, an even smaller fraction of the grid cell
+!    is used. Large scale precipitation occurs over larger areas than
+!    convective precipitation.
+!**************************************************************************
+
+    if (lsp.gt.20.) then
+      i=5
+    else if (lsp.gt.8.) then
+      i=4
+    else if (lsp.gt.3.) then
+      i=3
+    else if (lsp.gt.1.) then
+      i=2
+    else
+      i=1
+    endif
+
+    if (convp.gt.20.) then
+      j=5
+    else if (convp.gt.8.) then
+      j=4
+    else if (convp.gt.3.) then
+      j=3
+    else if (convp.gt.1.) then
+      j=2
+    else
+      j=1
+    endif
+
+
+!ZHG oct 2014 : Calculated for 1) both 2) lsp 3) convp 
+! Tentatively differentiate the grfraction for lsp and convp for treating differently the two forms
+! for now they are treated the same
+    grfraction(1)=max(0.05,cc*(lsp*lfr(i)+convp*cfr(j))/(lsp+convp))
+    grfraction(2)=max(0.05,cc*(lfr(i)))
+    grfraction(3)=max(0.05,cc*(cfr(j)))
+
+
+! 2) Computation of precipitation rate in sub-grid cell
+!******************************************************
+    prec(1)=(lsp+convp)/grfraction(1)
+    prec(2)=(lsp)/grfraction(2)
+    prec(3)=(convp)/grfraction(3)
+
+
+! 3) Computation of scavenging coefficients for all species
+!    Computation of wet deposition
+!**********************************************************
+
+    do ks=1,nspec      ! loop over species
+      wetdeposit(ks)=0. 
+      wetscav=0.
+
+! Cycle loop if wet deposition for the species is off
+      if (WETDEPSPEC(ks).eqv..false.) cycle
+
+      if (ngrid.gt.0) then
+        act_temp=ttn(ix,jy,hz,n,ngrid)
+      else
+        act_temp=tt(ix,jy,hz,n)
+      endif
+
+
+!***********************
+! BELOW CLOUD SCAVENGING
+!***********************  
+      if (clouds_v.ge.4) then !below cloud
+
+! For gas: if positive below-cloud parameters (A or B), and dquer<=0
 !******************************************************************
-     itage=abs(itra1(jpart)-itramem(jpart))
-     do nage=1,nageclass
-       if (itage.lt.lage(nage)) goto 33
-     end do
- 33  continue
-
-    do ks=1,nspec      ! loop over species
+        if ((dquer(ks).le.0.).and.(weta_gas(ks).gt.0..or.wetb_gas(ks).gt.0.)) then
+          !        if (weta(ks).gt.0. .or. wetb(ks).gt.0.) then 
+          blc_count(ks)=blc_count(ks)+1
+          wetscav=weta_gas(ks)*prec(1)**wetb_gas(ks)
+
+! For aerosols: if positive below-cloud parameters (Crain/Csnow or B), and dquer>0
+!*********************************************************************************
+        else if ((dquer(ks).gt.0.).and.(crain_aero(ks).gt.0..or.csnow_aero(ks).gt.0.)) then
+          blc_count(ks)=blc_count(ks)+1
+
+!NIK 17.02.2015
+! For the calculation here particle size needs to be in meter and not um as dquer is
+! changed in readreleases
+! For particles larger than 10 um use the largest size defined in the parameterizations (10um)
+          dquer_m=min(10.,dquer(ks))/1000000. !conversion from um to m
+
+! Rain:
+          if (act_temp .ge. 273. .and. crain_aero(ks).gt.0.)  then
+
+! ZHG 2014 : Particle RAIN scavenging coefficient based on Laakso et al 2003, 
+! the below-cloud scavenging (rain efficienty) parameter Crain (=crain_aero) from SPECIES file
+            wetscav=crain_aero(ks)*10**(bclr(1)+(bclr(2)*(log10(dquer_m))**(-4))+ &
+                 & (bclr(3)*(log10(dquer_m))**(-3))+ (bclr(4)*(log10(dquer_m))**(-2))+&
+                 &(bclr(5)*(log10(dquer_m))**(-1))+bclr(6)* (prec(1))**(0.5))
+
+! Snow:
+          elseif (act_temp .lt. 273. .and. csnow_aero(ks).gt.0.)  then 
+! ZHG 2014 : Particle SNOW scavenging coefficient based on Kyro et al 2009, 
+! the below-cloud scavenging (Snow efficiency) parameter Csnow (=csnow_aero) from SPECIES file
+            wetscav=csnow_aero(ks)*10**(bcls(1)+(bcls(2)*(log10(dquer_m))**(-4))+&
+                 &(bcls(3)*(log10(dquer_m))**(-3))+ (bcls(4)*(log10(dquer_m))**(-2))+&
+                 &(bcls(5)*(log10(dquer_m))**(-1))+ bcls(6)* (prec(1))**(0.5))
+
+          endif
+          
+!             write(*,*) 'bl-cloud, act_temp=',act_temp, ',prec=',prec(1),',wetscav=', wetscav, ', jpart=',jpart
+
+        endif ! gas or particle
+!      endif ! positive below-cloud scavenging parameters given in Species file
+      endif !end BELOW
+
+!********************
+! IN CLOUD SCAVENGING
+!********************
+      if (clouds_v.lt.4) then ! In-cloud
+! NIK 13 may 2015: only do incloud if positive in-cloud scavenging parameters are
+! given in species file, or if gas and positive Henry's constant
+        if ((ccn_aero(ks).gt.0. .or. in_aero(ks).gt.0.).or.(henry(ks).gt.0.and.dquer(ks).le.0)) then 
+          inc_count(ks)=inc_count(ks)+1
+! if negative coefficients (turned off) set to zero for use in equation
+          if (ccn_aero(ks).lt.0.) ccn_aero(ks)=0.
+          if (in_aero(ks).lt.0.) in_aero(ks)=0.
+
+!ZHG 2015 Cloud liquid & ice water (CLWC+CIWC) from ECMWF
+! nested fields
+          if (ngrid.gt.0.and.readclouds_this_nest) then
+            cl=ctwcn(ix,jy,n,ngrid)*(grfraction(1)/cc)
+          else if (ngrid.eq.0.and.readclouds) then
+            cl=ctwc(ix,jy,n)*(grfraction(1)/cc)
+          else                                  !parameterize cloudwater m2/m3
+!ZHG updated parameterization of cloud water to better reproduce the values coming from ECMWF
+            cl=1.6E-6*prec(1)**0.36
+          endif
+
+!ZHG: Calculate the partition between liquid and water phase water. 
+          if (act_temp .le. 253.) then
+            liq_frac=0
+          else if (act_temp .ge. 273.) then
+            liq_frac=1
+          else
+            liq_frac =((act_temp-273.)/(273.-253.))**2.
+          end if
+! ZHG: Calculate the aerosol partition based on cloud phase and Ai and Bi
+          frac_act = liq_frac*ccn_aero(ks) +(1-liq_frac)*in_aero(ks)
+
+!ZHG Use the activated fraction and the liqid water to calculate the washout
+
+! AEROSOL
+!********
+          if (dquer(ks).gt.0.) then
+            S_i= frac_act/cl
+
+! GAS
+!****
+          else
+
+            cle=(1-cl)/(henry(ks)*(r_air/3500.)*act_temp)+cl
+!REPLACE to switch old/ new scheme 
+          ! S_i=frac_act/cle
+            S_i=1/cle
+          endif ! gas or particle
+
+! scavenging coefficient based on Hertel et al 1995 - using the S_i for either gas or aerosol
+!OLD 
+          if ((readclouds.and.ngrid.eq.0).or.(readclouds_this_nest.and.ngrid.gt.0)) then
+            wetscav=incloud_ratio*S_i*(prec(1)/3.6E6)
+          else
+            wetscav=incloud_ratio*S_i*(prec(1)/3.6E6)/clouds_h
+          endif
+
+
+        endif ! positive in-cloud scavenging parameters given in Species file
+      endif !incloud
+!END ZHG TEST
 
 !**************************************************
 ! CALCULATE DEPOSITION 
 !**************************************************
-!       wetscav=0.
-       
-!        write(*,*) ks,dquer(ks), crain_aero(ks),csnow_aero(ks)
-!       if (((dquer(ks).le.0.).and.(weta_gas(ks).gt.0..or.wetb_gas(ks).gt.0.)) &
-!          .or. &
-!          ((dquer(ks).gt.0.).and.(crain_aero(ks).gt.0..or.csnow_aero(ks).gt.0.).or. &
-!            (ccn_aero(ks).gt0) .or. (in_aero(ks).gt.0) .or. (henry(ks).gt.0)))  then
-
-      call get_wetscav(itime,ltsample,loutnext,jpart,ks,grfraction,inc_count,blc_count,wetscav)
-      
+!     if (wetscav.le.0) write (*,*) 'neg, or 0 wetscav!'
+!     +          ,wetscav,cle,cl,act_temp,prec,clouds_h,clouds_v
 
       if (wetscav.gt.0.) then
         wetdeposit(ks)=xmass1(jpart,ks)* &
              (1.-exp(-wetscav*abs(ltsample)))*grfraction(1)  ! wet deposition
+!write(*,*) 'MASS DEPOSITED: PREC, WETSCAV, WETSCAVP', prec(1), wetdeposit(ks), xmass1(jpart,ks)* & 
+!             (1.-exp(-wetscav_dummy*abs(ltsample)))*grfraction(1), clouds_v
+
+
       else ! if no scavenging
         wetdeposit(ks)=0.
       endif
- 
+
       restmass = xmass1(jpart,ks)-wetdeposit(ks)
       if (ioutputforeachrelease.eq.1) then
@@ -146 +417 @@
       endif
 
-!    endif ! no deposition
-    end do ! loop over species
+
+    end do !all species
 
 ! Sabine Eckhardt, June 2008 create deposition runs only for forward runs
@@ -164 +435 @@
 
 ! count the total number of below-cloud and in-cloud occurences:
-  tot_blc_count=tot_blc_count+blc_count
-  tot_inc_count=tot_inc_count+inc_count
+  tot_blc_count(1:nspec)=tot_blc_count(1:nspec)+blc_count(1:nspec)
+  tot_inc_count(1:nspec)=tot_inc_count(1:nspec)+inc_count(1:nspec)
 
 end subroutine wetdepo