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Initialization for Real Data Cases

This guide provides a detailed overview of initializing real data for the WRF model, focusing on the essential steps necessary to run the real-data initialization effectively. Key topics include modifying the namelist, configuring domain size and grid settings, processing output metadata, and properly ingesting SI data. Ideal for users looking to understand the flow of running real.exe, balancing necessary fields, and troubleshooting common issues. This comprehensive resource ensures users can maximize their real-data simulations with minimal errors.

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Initialization for Real Data Cases

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  1. Initialization for Real Data Cases Dave Gill gill@ucar.edu wrf-model.org

  2. Pandas Ingest only bamboo shoots Lethargic, indifferent mating habits real.exe Ingests only SI data Doesn’t screw you very often

  3. WRF real-data init • NECESSARY – the minimum changes: How to run real data initialization • Fix namelist • Put SI data in right place • Run real.exe • Rest of things to take up time slot Files you see before and after Necessary fields Balancing List of gotcha’s Program flow

  4. Running real-data init • Real.exe controlled by namelist file (same one as WRF). Located in ./WRFV1/test/em_real directory • Modify times to process: time_step_max • Domain size (maximal dimensions for C-grid) s_we, e_we s_sn, e_sn s_vert, e_vert

  5. Running real-data init • Domain grid configuration: dx, dy dt, ztop • Times to process: start_year, start_month, start_day, start_hour end_year, end_month, end_day, end_hour interval_seconds

  6. Running real-data init • Get SI-output data in place – # cd ./WRFV1/test/em_real # ln –s ${SI_LOC}/data/siprd/real_input_em.* . Expect to have a single file for each time period to be processed + the metadata file • Run the executable in this directory • # ./real.exe Single processor only

  7. Data Files before and after • Before: Foreach time period - real_input_em_d01.2002-06-27_18:00:00 Only once - real_input_em.global.metadata • From SI system, final output from vinterp

  8. Data Files before and after • After: wrfinput, wrfbdy • Currently, in netCDF format, view with ncdump utility

  9. Necessary Fields • SI provides 3d, 2d, 1d, and constants 3d: u, v, mixing ratio, potential temperature 2d: map factors, Coriolis, lat/lon, map rotations, ground temp, skin temp, dry surface pressure, land use categories, terrain 1d: eta (vertical coordinate) • Already on correct vertical coordinate, each variable is in its correct staggering location, all maximally dimensioned (i,j,k) ordering • Generic reader routine

  10. Balancing - base • Define base state surface pressure, function of elevation • pb = znu(psurf-ptop) + ptop • tb = (t00 + A ln(pb/p00) * (p00/pb)^(R/Cp) • alb = (R/p1000)*tb*(pb/p1000)^cvpm • mub = psurf – ptop; mu = pdsurf - psurf • phb = phb k-1 – 1/znu * mub * alb The code

  11. Balancing • Top level: p = -0.5 (mu + q * mub * 1/znu) qv = 1 + 1.61 q alt = (R/p1000)*t*qv((p+pb)/p1000)^cvpm al = alt – alb The code

  12. Balancing • Integrate down: p, moisture, inverse density ph = ph k-1 – dnw * ( mub + mu*alt ) • u,v as input; w=0 • No other moisture initialized than mixing ratio

  13. List of Gotcha’s • LSM: num_soil_layers = 4, must re-run real.exe if swapping bl_surface_physics • Dates must match SI output files, SI files must be in working directory • Domain size and various grid configurations are compared to the namelist values – don’t share the global metadata file • Single processor only • mm52wrf only works for eh

  14. Program Flow • All main programs are in ./WRFV1/main Do-it-once items: namelist, allocate space Time loop initialize domain for current time if time=0, output IC couple u,v,t,ph,q for lateral BC compute tendencies, output if time > 0 End Time loop

  15. Program Flow • Inside each time loop Read SI input file (flat, binary, Fortran) Assign 2d arrays – be careful of array sizes Logic to determine which fields to use based on which fields you have and physics options selected Soil data initialization and adjustment, % categorical Base state computations Diagnose balanced fields for input to WRF

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