Voir la source de HowTo: Run an aquaplanet simulation

== The aquaplanet configuration ==
The ''aquaplanet'' configuration is a simpler setup than a usual simulation of the Earth's atmosphere in that idealized initial and boundary conditions are used: no topography and imposed surface temperatures over the whole globe (hence the "aqua"). Apart from this, the full physics package is used, just like in a "regular" LMDZ simulation.

== aquaplanet parameters ==
In practice setting up an aquaplanet simulation is simpler as one may start without initial condition files (start.nc and startfi.nc). This requires setting
<pre>
read_start=n
</pre>
in run.def

In addition one must specify a value of '''iflag_phys''' between 101 and 114 to trigger the aquaplanet mode, e.g.
<pre>
iflag_phys=101
</pre>
This will automatically generate initial conditions and trigger the generation of a '''limit.nc''' file adapted to the aquaplanet setup. The values of surface temperature that will be put in the limit.nc file depend on '''iflag_phys''' (see routines ''iniaqua'' and ''profil_sst'' in libf/phylmd/phyaqua_mod.F90).

== Good to know ==
Note that to continue an aquaplanet simulation (i.e. using restart.nc and restartphy.nc files from a previous aquaplanet simulation) one should revert iflag_phys to 1.

03/12/2021

[[Category:HowTo]]