Changes between Version 83 and Version 84 of Doc/FAQ

Timestamp:

03/03/23 11:40:37 (16 months ago)

Author:

snguyen

Comment:

--

Doc/FAQ

@@ -299 +299 @@
 Extending a simulation using MOSAIC weights and switching to MOSAIX weights is mostly relevant for long simulations at equilibrium (for instance paleoclimates deeptime simulations). The improved interpolation schemes used in MOSAIX result in a better conservation of some quantities. One of the desirable effects it can have is a reduction of sea surface height drift which can become non negligible with simulations over several millenia.
 
-So, can you use your MOSAIC simulation restarts for running your MOSAIX simulation ?
+### Can you use your MOSAIC simulation restarts for running your MOSAIX simulation ? ###
 
 The short answer is : no, you can't do it.
@@ -305 +305 @@
 The long answer is : no, not as an actual restart for all the components, but you can still use your MOSAIC simulation to initialise a MOSAIX run with the same ocean state.
 
-### Why is it so ? ###
+'''Why is it so ?'''
 
 The problem originates from the combination of two facts.
 
-'''First'''
+''First''
 Because the o2a.nc files produced by MOSAIC and MOSAIX differ (they have different coastlines), when interpolating from the ocean grid to the atmosphere grid points very close to the coast, land points can become sea points and vice versa if you switch from the MOSAIC to the MOSAIX weights.
 
-'''Second'''
+''Second''
 The o2a.nc file is read only once by LMDZ when producing restart files and boundary conditions for a forced simulation with create_etat0_limit.e and is embedded in the restart files.
 
@@ -328 +328 @@
 You can use the last year of the MOSAIC run or a climatology of the last years to equilibrate the atmosphere and then use this equilibrated atmosphere as an initial state for your MOSAIX run.
 
+### The procedure ###
+* take the last year of sst and sea ice coverage from LMDZ in your MOSAIC coupled simulation.
+For a simulation named CM5A2WPIREF we can extract the variables `tsol_oce` and `pourc_sic` from the `histmth.nc` file `CM5A2WPIREF_20400101_20491231_1M_histmth.nc` and extract the last year with nco and cdo:
+{{{
+ncks -v tsol_oce,pourc_sic CM5A2WPIREF_20400101_20491231_1M_histmth.nc CM5A2WPIREF_20400101_20491231_1M_tsol_oce_pourc_sic.nc
+cdo seldate,2049-01-16,2049-12-16 CM5A2WPIREF_20400101_20491231_1M_tsol_oce_pourc_sic.nc CM5A2WPIREF_20490101_20491231_1M_tsol_oce_pourc_sic.nc
+}}}
 
 # FAQ :  Special configurations #