##Trail for WRF-CHEM, WRF CHEM simulation with dust only tutorial## 1. It is based on this to run compiled wrf chem in serial mode with only dust.

###WPS:Geogrid### 9. As per this point 7, file GEOGRID.TBL.ARW_CHEM in WPS geogrid directory was linked as GEOGRID.TBL using GUI of ubuntu 12.04. 10. The namelist.wps from the page was used. The namelist.wps is as follows,

    &share
            wrf_core = 'ARW',
            max_dom = 1,
            start_date = '2010-07-14_00:00:00','2010-07-14_00:00:00',
            end_date = '2010-07-19_00:00:00','2010-07-19_00:00:00',
            interval_seconds = 10800,
            io_form_geogrid = 2,
            /

            &geogrid
            parent_id         =   1,     1,     1,
            parent_grid_ratio =   1,     5,     5,
            i_parent_start    =   1,     6,     105,
            j_parent_start    =   1,     65,    25,
            e_we              =    41,   201,   226,
            e_sn              =    41,   311,   231,
            geog_data_res     =   '10m', '2m', '30s'
            dx        = 100000,
            dy        = 100000,
            map_proj  =  'lambert',
            ref_lat   =  35.0,
            ref_lon   =  25.0,
            truelat1  =  30.0,
            truelat2  =  40.0,
            stand_lon =  25.0,
            ref_x     =  20.5
            ref_y     =  20.5
            geog_data_path = '/home/hoopoe/ems/wrfems/data/geog'
            /

            &ungrib
            out_format = 'WPS',
            prefix = 'FILE',
            /

            &metgrid
            fg_name = 'FILE'
            io_form_metgrid = 2,
            /
            opt_ignore_dom_center = .true.,

            &mod_levs
            press_pa = 201300 , 200100 , 100000 ,
         95000 ,  90000 ,
         85000 ,  80000 ,
         75000 ,  70000 ,
         65000 ,  60000 ,
         55000 ,  50000 ,
         45000 ,  40000 ,
         35000 ,  30000 ,
         25000 ,  20000 ,
         15000 ,  10000 ,
          5000 ,   1000
            /

1. With this the geogrid was executed by ./geogrid.exe and ended with successful completion and following file geo_em.d01.nc was created. During geogrid.exe, as per the page point 10, EORD was processed but no processing was happen for CLAYFRAC and SANDFRAC.

###WPS: Ungrib###

1. The gfs files downloaded as per this and from here was used, average size around 45MB for each files. The files naming convention in a such a manner that no dates can be clarified from just read.
2. The vtable was linked inside WPS folder by ln -sf ungrib/Variable_Tables/Vtable.GFS Vtable.

3. The GFS files inside the gfs folder is linked with WPS folder by ./link_grib.csh /home/swl-sacon-dst/wrf/WRF341/WRF_CHEM_trails/dust_onlytut/WRF-CHEM_GFS/, by this following file with links were created by this step inside WPS folder.

   GRIBFILE.AAA -> /home/swl-sacon-dst/wrf/WRF341/WRF_CHEM_trails/dust_onlytut/WRF-CHEM_GFS/1019500000000
   GRIBFILE.AAB -> /home/swl-sacon-dst/wrf/WRF341/WRF_CHEM_trails/dust_onlytut/WRF-CHEM_GFS/1019506000000
   GRIBFILE.AAC -> /home/swl-sacon-dst/wrf/WRF341/WRF_CHEM_trails/dust_onlytut/WRF-CHEM_GFS/1019512000000
   

   ……………………………………………… ……………………………………………… GRIBFILE.AAU -> /home/swl-sacon-dst/wrf/WRF341/WRFCHEMtrails/dustonlytut/WRF-CHEMGFS/1020000000000

4. The ungrib.exe was run using this command ./ungrib.exe >& ungrib_data.log, the log file says successful completion of the ungrib and run for about 7 minutes. It created a 41 files such as this FILE:2010-07-14_00.

###WPS:Metgrid###

1. For the metgrid part of WPS, as per the tutorial page the content was checked for namelist.wps and kept as such of geogrid.exe namelist.
2. Then the metgrid was executed by ./metgrid.exe and it ended with successful completion and creation of following nc files named from met_em.d01.2010-07-14_00:00:00.nc to met_em.d01.2010-07-19_00:00:00.nc
3. The metgrid.log was reviewed and it is found message saying the EROD field has been read in and written to file.

###WRF:real.exe###

1. For making WRF run, the folder content from WRFV3CHEM_serial/test/em_real was used as such and all the met files are linked inside the em_real folder using the command ln -sf /home/swl-sacon-dst/wrf/WRF341/WRF_CHEM_trails/dust_onlytut/WPS/met_em* .. With this real.exe was executed and it created wrfinput and wrfbdy files, input file used was of provided with tutorial.

####WRF:wrf.exe###

1. The wrf.exe was executed after real.exe and it ran for 50 minutes to simulate 48 hours of weather condition over the domain.