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2D-model in arp/ifs framework

2D-model in arp/ifs framework. Same code as the complete 3D-model Few modifications driven by the LMAP key Setup (geometry) SL scheme Developped by the NH Aladin team Also some utilisations within Arome (Squall line). Running the 2D-model (3 steps).

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2D-model in arp/ifs framework

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  1. 2D-model in arp/ifs framework • Same code as the complete 3D-model • Few modifications driven by the LMAP key • Setup (geometry) • SL scheme • Developped by the NH Aladin team • Also some utilisations within Arome (Squall line)

  2. Running the 2D-model (3 steps) • Step 1 : to prepare an Aladin/Arome file –ACADFA facilities- • Step 2 : run the model • Step 3 : Post-processing –FLUX facilities-

  3. ACADFA (many versions) ACADFA finit src Run Makefile Source files .exe namelist Output file

  4. The different steps of ACADFA • Set up internal constants • Read namelist • Set-up of namelist-deductible variables • Temp from brunt-Vaissala frequency • Pressure and level coefficients from dZ,Temp, Ref pressure • Prepare output file (frame of the fa file) • Write grid-point data • Compute orography (from the def of the hill) • Write constant fields • Write 2D spectral data • Compute surf pressure from interpolation of ref pressure over the hill • Write 3D spectral data • Write other fields with constant values in general

  5. some namelist variables of Acadfa • IDGUX (C+I) & IDGL (C+I+E), IFLEV • INSMAX= meridional truncation • ZDELY, ZDELZ • LMPHYS, LREASUR • LNHDYN • LMAP • IPOSITION (position of Hill), ZWIDTH, ZHEIGHT • ZT00, ZP00, ZU00, …

  6. Run a 2D case • Nothing special providing the good file except : • Lmap=F, RCORI_ACAD (coriolis for academic) in nemgeo • Tune or not the sponge (mountain waves absorbing layer at the top) • Nproma=-ndgl (namdim)

  7. Flux facilities (post-processing for academic cases) • An ensemble of sources able to read fa 2d outputs and to make ascii files • Then can be plotted with usual graphics tools

  8. Ex in Arome 2D squall line • To test Microphysics and 1D TKE in Arome • Some tuning of Acadfa to put a prescribed profile (T, Q, U) coming from an observed RS + horizontal homogeneity. • Some prescribed values during the run (a cooling during a limited period of time and on a bounded layer, some idealized values of surface fluxes), still in the code under key • LSQUALL key (NAMMNH)

  9. 2D Academic Squall Line TKE+microphysics (Yann Seity, feb 2004) Theta-theta0 Vertical velocity Relative wind Cloud humidity TKE Sum hydro

  10. 2D Academic Squall Line TKE+microphysics Yann Seity feb 2004 AROME(7.5s) (+8h) AROME (30s)

  11. Concluding remarks • A tool developped by dynamicians • But should interest also the physicians to test for ex the importance of advection for some processes or some phys-dyn interactions in a simplified framework

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