Hello,
 I ran RegCM4.5 with dust model and I got the output files.
 But, I don't understand the variables of CHE files. Could you please send me a  file that helps me understand the variables?
The variables are followings:
       float wdrflx ( time, iy, jx )
         long_name : Wet deposition flux due to rainout
         standard_name : wet_deposition_flux_from_rainout
         units : mg m-2 day-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: mean

      float wdwflx ( time, iy, jx )
         long_name : Wet deposition flux due to washout
         standard_name : wet_deposition_flux_from_washout
         units : mg m-2 day-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: mean

      float ddflx ( time, iy, jx )
         long_name : Dry deposition flux
         standard_name : dry_deposition_flux
         units : mg m-2 day-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: mean

      float emflx ( time, iy, jx )
         long_name : Surface emission flux
         standard_name : surface_emission_flux
         units : mg m-2 day-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: mean

      float ddvel ( time, iy, jx )
         long_name : Dry deposition velocity
         standard_name : dry_deposition_velocity
         units : m s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: mean

      float burden ( time, iy, jx )
         long_name : Tracer total burden
         standard_name : tracer_burden
         units : mg m-2
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: mean

      float emiten ( time, iy, jx )
         long_name : Tendency of tracer due to emission
         standard_name : tendency_of_mixing_ratio_due_to_emission
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float mixrat ( time, kz, iy, jx )
         long_name : Atmosphere tracer mixing ratio
         standard_name : atmosphere_mixing_ratio_of_tracer
         units : 1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float cheten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to chemical reactions
         standard_name : tendency_of_mixing_ratio_due_to_chemical_prod_loss
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float advhten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to horizontal advection
         standard_name : tendency_of_mixing_ratio_due_to_horizontal_advection
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float advvten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to vertical advection
         standard_name : tendency_of_mixing_ratio_due_to_vertical_advection
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float difhten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to diffusion
         standard_name : tendency_of_mixing_ratio_due_to_diffusion
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float cuten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to convective transport
         standard_name : tendency_of_mixing_ratio_due_to_convective_transport
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float tuten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to vertical turbolence
         standard_name : tendency_of_mixing_ratio_due_to_vertical_turbolence
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float raiten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to total rainout
         standard_name : tendency_of_mixing_ratio_due_to_total_rainout
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float wasten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to total washout
         standard_name : tendency_of_mixing_ratio_due_to_total_washout
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float bdyten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to boundary conditions
         standard_name : tendency_of_mixing_ratio_due_to_boundary_conditions
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float sedten ( time, kz, iy, jx )
         long_name : Tendency of tracer due to sedimentation
         standard_name : tendency_of_mixing_ratio_due_to_sedimentation
         units : kg kg-1 s-1
         coordinates : xlat xlon
         grid_mapping : crs
         cell_methods : time: point

      float time ( time )
         long_name : time
         standard_name : time
         units : hours since 1949-12-01 00:00:00 UTC
         calendar : gregorian
         bounds : time_bnds

      float time_bnds ( time, time_bounds )
         units : hours since 1949-12-01 00:00:00 UTC
         calendar : gregorian

      character crs ( ncl_scalar )
         proj4_params : +proj=omerc +lat_0=12.00 +alpha=90.0 +lonc=8.00 +x_0=-30000. +y_0=-30000. +ellps=sphere +a=6371229. +b=6371229. +units=m +no_defs
         grid_mapping_name : rotated_mercator
         latitude_of_projection_origin :   12
         longitude_of_projection_origin :    8
         scale_factor_at_projection_origin :    1
         semi_major_axis : 6371229
         inverse_flattening :    0
         false_easting : -30000
         false_northing : -30000
         _CoordinateTransformType : Projection
         _CoordinateAxisTypes : GeoX GeoY

Best regards
Lucy