diff --git a/sorc/chgres_cube.fd/write_data.F90 b/sorc/chgres_cube.fd/write_data.F90
index 1c02ab27c..325c5ffe9 100644
--- a/sorc/chgres_cube.fd/write_data.F90
+++ b/sorc/chgres_cube.fd/write_data.F90
@@ -1323,109 +1323,109 @@ subroutine write_fv3_atm_data_netcdf(localpet)
    endif
 
 !--- define field
-   error = nf90_def_var(ncid, 'geolon', NF90_FLOAT, (/dim_lon,dim_lat/), id_lon)
+   error = nf90_def_var(ncid, 'geolon', NF90_FLOAT, (/dim_lon,dim_lat/), id_lon, chunksizes=(/i_target_out,j_target_out/))
    call netcdf_err(error, 'DEFINING GEOLON FIELD' )
    error = nf90_put_att(ncid, id_lon, "long_name", "Longitude")
    call netcdf_err(error, 'DEFINING GEOLON NAME' )
    error = nf90_put_att(ncid, id_lon, "units", "degrees_east")
    call netcdf_err(error, 'DEFINING GEOLON UNITS' )
 
-   error = nf90_def_var(ncid, 'geolat', NF90_FLOAT, (/dim_lon,dim_lat/), id_lat)
+   error = nf90_def_var(ncid, 'geolat', NF90_FLOAT, (/dim_lon,dim_lat/), id_lat, chunksizes=(/i_target_out,j_target_out/))
    call netcdf_err(error, 'DEFINING GEOLAT FIELD' )
    error = nf90_put_att(ncid, id_lat, "long_name", "Latitude")
    call netcdf_err(error, 'DEFINING GEOLAT NAME' )
    error = nf90_put_att(ncid, id_lat, "units", "degrees_north")
    call netcdf_err(error, 'DEFINING GEOLAT UNITS' )
 
-   error = nf90_def_var(ncid, 'geolon_s', NF90_FLOAT, (/dim_lon,dim_latp/), id_lon_s)
+   error = nf90_def_var(ncid, 'geolon_s', NF90_FLOAT, (/dim_lon,dim_latp/), id_lon_s, chunksizes=(/i_target_out,jp1_target_out/))
    call netcdf_err(error, 'DEFINING GEOLON_S FIELD' )
    error = nf90_put_att(ncid, id_lon_s, "long_name", "Longitude_s")
    call netcdf_err(error, 'DEFINING GEOLON_S NAME' )
    error = nf90_put_att(ncid, id_lon_s, "units", "degrees_east")
    call netcdf_err(error, 'DEFINING GEOLON_S UNITS' )
 
-   error = nf90_def_var(ncid, 'geolat_s', NF90_FLOAT, (/dim_lon,dim_latp/), id_lat_s)
+   error = nf90_def_var(ncid, 'geolat_s', NF90_FLOAT, (/dim_lon,dim_latp/), id_lat_s, chunksizes=(/i_target_out,jp1_target_out/))
    call netcdf_err(error, 'DEFINING GEOLAT_S FIELD' )
    error = nf90_put_att(ncid, id_lat_s, "long_name", "Latitude_s")
    call netcdf_err(error, 'DEFINING GEOLAT_S NAME' )
    error = nf90_put_att(ncid, id_lat_s, "units", "degrees_north")
    call netcdf_err(error, 'DEFINING GEOLAT_S UNITS' )
 
-   error = nf90_def_var(ncid, 'geolon_w', NF90_FLOAT, (/dim_lonp,dim_lat/), id_lon_w)
+   error = nf90_def_var(ncid, 'geolon_w', NF90_FLOAT, (/dim_lonp,dim_lat/), id_lon_w, chunksizes=(/ip1_target_out,j_target_out/))
    call netcdf_err(error, 'DEFINING GEOLON_W FIELD' )
    error = nf90_put_att(ncid, id_lon_w, "long_name", "Longitude_w")
    call netcdf_err(error, 'DEFINING GEOLON_W NAME' )
    error = nf90_put_att(ncid, id_lon_w, "units", "degrees_east")
    call netcdf_err(error, 'DEFINING GEOLON_W UNITS' )
 
-   error = nf90_def_var(ncid, 'geolat_w', NF90_FLOAT, (/dim_lonp,dim_lat/), id_lat_w)
+   error = nf90_def_var(ncid, 'geolat_w', NF90_FLOAT, (/dim_lonp,dim_lat/), id_lat_w, chunksizes=(/ip1_target_out,j_target_out/))
    call netcdf_err(error, 'DEFINING GEOLAT_W FIELD' )
    error = nf90_put_att(ncid, id_lat_w, "long_name", "Latitude_w")
    call netcdf_err(error, 'DEFINING GEOLAT_W NAME' )
    error = nf90_put_att(ncid, id_lat_w, "units", "degrees_north")
    call netcdf_err(error, 'DEFINING GEOLAT_W UNITS' )
 
-   error = nf90_def_var(ncid, 'ps', NF90_FLOAT, (/dim_lon,dim_lat/), id_ps)
+   error = nf90_def_var(ncid, 'ps', NF90_FLOAT, (/dim_lon,dim_lat/), id_ps,  chunksizes=(/i_target_out,j_target_out/))
    call netcdf_err(error, 'DEFINING PS' )
    error = nf90_put_att(ncid, id_ps, "coordinates", "geolon geolat")
    call netcdf_err(error, 'DEFINING PS COORD' )
 
-   error = nf90_def_var(ncid, 'w', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_w)
+   error = nf90_def_var(ncid, 'w', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_w, chunksizes=(/i_target_out,j_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING W' )
    error = nf90_put_att(ncid, id_w, "coordinates", "geolon geolat")
    call netcdf_err(error, 'DEFINING W COORD' )
 
-   error = nf90_def_var(ncid, 'zh', NF90_FLOAT, (/dim_lon,dim_lat,dim_levp1/), id_zh)
+   error = nf90_def_var(ncid, 'zh', NF90_FLOAT, (/dim_lon,dim_lat,dim_levp1/), id_zh, chunksizes=(/i_target_out,j_target_out,levp1_target/))
    call netcdf_err(error, 'DEFINING ZH' )
    error = nf90_put_att(ncid, id_zh, "coordinates", "geolon geolat")
    call netcdf_err(error, 'DEFINING ZH COORD' )
 
-   error = nf90_def_var(ncid, 't', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_t)
+   error = nf90_def_var(ncid, 't', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_t, chunksizes=(/i_target_out,j_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING T' )
    error = nf90_put_att(ncid, id_t, "coordinates", "geolon geolat")
    call netcdf_err(error, 'DEFINING T COORD' )
 
-   error = nf90_def_var(ncid, 'delp', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_delp)
+   error = nf90_def_var(ncid, 'delp', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_delp, chunksizes=(/i_target_out,j_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING DELP' )
    error = nf90_put_att(ncid, id_delp, "coordinates", "geolon geolat")
    call netcdf_err(error, 'DEFINING DELP COORD' )
 
    do n = 1, num_tracers
      if (localpet==0) print*, "write to file tracer ", trim(tracers(n))
-     error = nf90_def_var(ncid, tracers(n), NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_tracers(n))
+     error = nf90_def_var(ncid, tracers(n), NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_tracers(n), chunksizes=(/i_target_out,j_target_out,lev_target/))
      call netcdf_err(error, 'DEFINING TRACERS' )
      error = nf90_put_att(ncid, id_tracers(n), "coordinates", "geolon geolat")
      call netcdf_err(error, 'DEFINING TRACERS COORD' )
    enddo
 
    if (use_thomp_mp_climo) then
-     error = nf90_def_var(ncid, 'ice_aero', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_qnifa)
+     error = nf90_def_var(ncid, 'ice_aero', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_qnifa, chunksizes=(/i_target_out,j_target_out,lev_target/))
      call netcdf_err(error, 'DEFINING QNIFA' )
      error = nf90_put_att(ncid, id_qnifa, "coordinates", "geolon geolat")
      call netcdf_err(error, 'DEFINING QNIFA COORD' )
 
-     error = nf90_def_var(ncid, 'liq_aero', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_qnwfa)
+     error = nf90_def_var(ncid, 'liq_aero', NF90_FLOAT, (/dim_lon,dim_lat,dim_lev/), id_qnwfa, chunksizes=(/i_target_out,j_target_out,lev_target/))
      call netcdf_err(error, 'DEFINING QNWFA' )
      error = nf90_put_att(ncid, id_qnwfa, "coordinates", "geolon geolat")
      call netcdf_err(error, 'DEFINING QNWFA COORD' )
    endif
 
-   error = nf90_def_var(ncid, 'u_w', NF90_FLOAT, (/dim_lonp,dim_lat,dim_lev/), id_u_w)
+   error = nf90_def_var(ncid, 'u_w', NF90_FLOAT, (/dim_lonp,dim_lat,dim_lev/), id_u_w, chunksizes=(/ip1_target_out,j_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING U_W' )
    error = nf90_put_att(ncid, id_u_w, "coordinates", "geolon_w geolat_w")
    call netcdf_err(error, 'DEFINING U_W COORD' )
 
-   error = nf90_def_var(ncid, 'v_w', NF90_FLOAT, (/dim_lonp,dim_lat,dim_lev/), id_v_w)
+   error = nf90_def_var(ncid, 'v_w', NF90_FLOAT, (/dim_lonp,dim_lat,dim_lev/), id_v_w, chunksizes=(/ip1_target_out,j_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING V_W' )
    error = nf90_put_att(ncid, id_v_w, "coordinates", "geolon_w geolat_w")
    call netcdf_err(error, 'DEFINING V_W COORD' )
 
-   error = nf90_def_var(ncid, 'u_s', NF90_FLOAT, (/dim_lon,dim_latp,dim_lev/), id_u_s)
+   error = nf90_def_var(ncid, 'u_s', NF90_FLOAT, (/dim_lon,dim_latp,dim_lev/), id_u_s, chunksizes=(/i_target_out,jp1_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING U_S' )
    error = nf90_put_att(ncid, id_u_s, "coordinates", "geolon_s geolat_s")
    call netcdf_err(error, 'DEFINING U_S COORD' )
 
-   error = nf90_def_var(ncid, 'v_s', NF90_FLOAT, (/dim_lon,dim_latp,dim_lev/), id_v_s)
+   error = nf90_def_var(ncid, 'v_s', NF90_FLOAT, (/dim_lon,dim_latp,dim_lev/), id_v_s, chunksizes=(/i_target_out,jp1_target_out,lev_target/))
    call netcdf_err(error, 'DEFINING V_S' )
    error = nf90_put_att(ncid, id_v_s, "coordinates", "geolon_s geolat_s")
    call netcdf_err(error, 'DEFINING V_S COORD' )