Post on 15-Jan-2016
description
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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) Step 1 : to prepare an Aladin/Arome file
–ACADFA facilities- Step 2 : run the model Step 3 : Post-processing –FLUX
facilities-
ACADFA (many versions)
ACADFA
Runsrc finit
Makefile
Source files
.exe
namelist
Output file
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
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, …
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)
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
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)
Theta-theta0
Relative wind Cloud
Vertical velocity
Sum hydroTKE
humidity
2D Academic Squall Line 2D Academic Squall Line TKE+microphysics (Yann TKE+microphysics (Yann Seity, feb 2004)Seity, feb 2004)
2D Academic Squall Line TKE+microphysics Yann Seity feb 20042D Academic Squall Line TKE+microphysics Yann Seity feb 2004
AROME(7.5s) (+8h) AROME (30s)
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