As a rough approximation, keep about 1/3 of the coarse-grid domain surrounding each side of the nest.
Your nest domain dimensions will be (ending index - starting index)*3+1
For nested domains, e_we and e_sn must be one greater than an interger multiple of the nest’s parent_grid_ratio. This is to ensure that a nest always starts and ends on a parent grid point. (i.e., e_we=n*parent_grid_ratio+1 for some integer n).
It is recommended to have domains no smaller than about 100x100. Note that there will be about 10 grid points (minimum of 5) on each side, in the boundary zone. If domains are too small, the solution will be determined by forcing data. Child domains should contain similar number of grid cells as the parent.
Possible available resolutions are 10m (~19km), 5m (~9km), 2m (~4km), and 30s (~0.9km).
When there are multiple resolutions available for geographical input data, choose a resolution that is slightly better than your grid resolution. For example, if your grid resolution is 9km, using 2 minute static data would be ideal.
It is recommended that dx and dy have the same value for Mercator, Polar, and Lambert projections.
it’s recommended that these are set to the center of the coarse domain
If this longitude is set to the same value as ref_lon, your coarsest domain will be centered.
out_format = ‘WPS’,
prefix = ‘…………/WRF3.9.1/WPS/ungrib_output/FILE’, !set output_dir
fg_name = ………./WRF3.9.1/WPS/ungrib_output/FILE’
io_form_metgrid = 2,
opt_output_from_metgrid_path = ‘……………/WRF3.9.1/WPS/metgrid_output’ !set output_dir
ln –s ungrib/Variable_Tables/Vtable.GFS Vtable
Link GRIB files to the correct file names in the run directory:
Here are my steps to generate emissions:
Run real.exe (chem_opt=0) to generate wrfinput_d0*and wrfbdy_d01;
Generate FINN fire-emissions following the README.WRF.fire;data_files fire_emis.inp fire_emis.tgz README.WRF.fire testFINNv1.5_2016.MOZ4.tar.gz fire_emis_input.tar README.GLB.fire srcGLOBAL_FINNv15_2016_MOZ4_05022017.txtshrub_from_img.nctropfor_from_img.ncwrfinput_d0*grass_from_img.nctempfor_from_img.nc&controldomains = 3,fire_directory = '/public/home/zhangxin/models/data/FINN/data_files/',fire_filename = 'GLOBAL_FINNv15_2016_MOZ4_05022017.txt',wrf_directory = '/public/home/zhangxin/models/data/FINN/data_files/',start_date = '2015-08-07',end_date = '2015-08-08',diag_level = 400,wrf2fire_map = 'co -> CO', 'no -> NO', 'so2 -> SO2', 'bigalk -> BIGALK','bigene -> BIGENE', 'c2h4 -> C2H4', 'c2h5oh -> C2H5OH','c2h6 -> C2H6', 'c3h8 -> C3H8','c3h6 -> C3H6','ch2o -> CH2O', 'ch3cho -> CH3CHO','ch3coch3 -> CH3COCH3','ch3oh -> CH3OH','mek -> MEK','toluene -> TOLUENE','nh3 -> NH3','no2 -> NO2','open -> BIGALD','c10h16 -> C10H16','gly -> CH3COCHO','acetol -> HYAC','isop -> ISOP','macr -> MACR''mvk -> MVK', 'ch3cooh -> CH3COOH','cres -> CRESOL','glyald -> GLYALD','mgly -> CH3COCHO','oc -> 0.24*PM25 + 0.3*PM10;aerosol', 'bc -> 0.01*PM25 + 0.08*PM10;aerosol','sulf -> -0.01*PM25 + 0.02*PM10;aerosol','pm25 -> 0.36*PM25;aerosol','pm10 -> -0.61*PM25 + 0.61*PM10;aerosol'/
Generate MEGAN biogenic-emissions following README.bio_emiss and no error in the log;&controldomains = 3,start_lai_mnth = 7,end_lai_mnth = 8,wrf_dir = '/nuist/u/home/xinzhang1215/work/model/history',/
Generate MEIC anthropogenic-emissions （like NEI anthropogenic-emissions) successfully;
Generate wesely and exo_coldens data files for MOZART successfully;&controldomains = 3,wrf_dir = '/nuist/u/home/xinzhang1215/work/model/history',/&controldomains = 3,wrf_dir = '/nuist/u/home/xinzhang1215/work/model/history',/
Link all these emission files to the ‘em_real’ directory;
Change chem_opt=112 and run real.exe again.
Create lateral boundary and initial conditions from a global chemistry model NCAR/ACOM. Download required files of mozbc from https://www2.acom.ucar.edu/wrf-chem/wrf-chem-tools-community.
Note: mozart data must be 1-2 days before and after simulation date. For example, you simulation date is 2015-08-07~2015-08-08. Then you should download 2015-08-05~2015-08-10 mozart data
- copy modfied wrfinput* and wrfbdy_d01 to ‘em_real’ directory
- Run wrf.exe