GitHub Issue #604 Undefined values found in radar reflectivity direct DA

src/gsi/read_dbz_nc.f90

@@ -69,11 +69,12 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
   use kinds, only: r_kind,r_double,i_kind,r_single
   use constants, only: zero,half,one,two,deg2rad,rad2deg, &
                        one_tenth,r1000,r60,r60inv,r100,r400,grav_equator, &
-                       eccentricity,somigliana,grav_ratio,grav,semi_major_axis,flattening 
+                       eccentricity,somigliana,grav_ratio,grav,semi_major_axis,flattening,r_missing
   use gridmod, only: tll2xy,nsig,nlat,nlon
   use obsmod, only: iadate,doradaroneob,oneoblat,oneoblon,oneobheight, &
                     mintiltdbz,maxtiltdbz,minobrangedbz,maxobrangedbz,&
                     static_gsi_nopcp_dbz,rmesh_dbz,zmesh_dbz
+  use gsi_4dvar, only: iwinbgn
   use hybrid_ensemble_parameters,only : l_hyb_ens
   use obsmod,only: radar_no_thinning,missing_to_nopcp
   use convinfo, only: nconvtype,ctwind,icuse,ioctype
@@ -147,7 +148,7 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
   integer(i_kind) :: maxobs,nchanl,ilat,ilon,scount
 
   real(r_kind) :: thistiltr,thisrange,this_stahgt,thishgt                           
-  real(r_kind) :: thisazimuthr,t4dv, &
+  real(r_kind) :: thisazimuthr, &
                   dlat,dlon,thiserr,thislon,thislat, &
                   timeb
   real(r_kind) :: radartwindow
@@ -337,6 +338,7 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
 
   call w3fs21(iadate,mins_an)  !mins_an -integer number of mins snce 01/01/1978
   rmins_an=mins_an             !convert to real number
+  timeb=real(mins_an-iwinbgn,r_kind)  !assume all observations are at the analysis time
 
   ivar = 1
 
@@ -453,7 +455,7 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
 
 
            ntmp=ndata  ! counting moved to map3gridS
-           timedif=abs(t4dv) !don't know about this
+           timedif=zero  ! assume all observations are at the analysis time
            crit1 = timedif/r6+half
 
            call map3grids(1,zflag,zl_thin,nlevz,thislat,thislon,&
@@ -481,7 +483,10 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
 
         !!end modified for thinning
 
-         thisazimuthr=0.0_r_kind
+         thisazimuthr=r_missing
+         thistiltr=r_missing
+         this_stahgt=r_missing
+         thisrange=r_missing
          this_staid=radid                !Via equivalence in declaration, value is propagated
                                                            !  to rstation_id used below.
          cdata_all(1,iout) = thiserr                       ! reflectivity obs error (dB) - inflated/adjusted
@@ -491,7 +496,7 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
          cdata_all(5,iout) = dbzQC(i,j,k)                      ! radar reflectivity factor 
          cdata_all(6,iout) = thisazimuthr                  ! 90deg-azimuth angle (radians)
 
-         cdata_all(7,iout) = timeb*r60inv                  ! obs time (analyis relative hour)
+         cdata_all(7,iout) = timeb*r60inv                  ! obs time (relative hour from beginning of the DA window)
          cdata_all(8,iout) = ikx                           ! type                  
          cdata_all(9,iout) = thistiltr                     ! tilt angle (radians)
          cdata_all(10,iout)= this_stahgt                   ! station elevation (m)
@@ -521,7 +526,6 @@ subroutine read_dbz_nc(nread,ndata,nodata,infile,lunout,obstype,sis,hgtl_full,no
   !---all looping done now print diagnostic output
 
   write(6,*)'READ_dBZ: Reached eof on radar reflectivity file'
-  write(6,*)'READ_dBZ: # volumes in input file             =',nvol
   write(6,*)'READ_dBZ: # read in obs. number               =',nread
   write(6,*)'READ_dBZ: # elevations outside time window    =',numbadtime
   write(6,*)'READ_dBZ: # of noise obs to no precip obs     =',num_nopcp

src/gsi/setupdbz.f90

@@ -590,14 +590,17 @@ subroutine setupdbz(obsLL,odiagLL,lunin,mype,bwork,awork,nele,nobs,is,radardbz_d
 !    Compute observation pressure (only used for diagnostics)
      dz     = zges(k2)-zges(k1)
      dlnp   = prsltmp(k2)-prsltmp(k1)
-     pobl   = prsltmp(k1) + (dlnp/dz)*(zob-zges(k1))
-
-     presw  = ten*exp(pobl)
-
      if ( l_use_dbz_directDA ) then
-        presq  = presw         
+        pobl   = prsltmp(k1) + (dlnp/dz)*(zob-zges(k1))
+        presw  = ten*exp(pobl)
+        presq  = presw
      else
-        if( (k1 == k2) .and. (k1 == 1) ) presw=ten*exp(prsltmp(k1)) 
+        if( (k1 == k2) .and. (k1 == 1) ) then
+           presw  = ten*exp(prsltmp(k1))
+        else
+           pobl   = prsltmp(k1) + (dlnp/dz)*(zob-zges(k1))
+           presw  = ten*exp(pobl)
+        end if
      end if
 
 !    solution to Nan in some members only for EnKF which causes problem?