Changes between Version 82 and Version 83 of Doc/FAQ


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Timestamp:
03/03/23 10:28:18 (16 months ago)
Author:
snguyen
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  • Doc/FAQ

    v82 v83  
    297297### Why would you want to do that ? ### 
    298298 
    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 sea surface height drift which can become non negligible with very long simulations over several millenia. 
    300  
    301 So, can you use your MOSAIC simulation restarts for running your MOSAIX simulation? 
    302  
    303 The short answer is : no, you can't do it.  
     299Extending 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. 
     300 
     301So, can you use your MOSAIC simulation restarts for running your MOSAIX simulation ? 
     302 
     303The short answer is : no, you can't do it. 
    304304 
    305305The 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. 
    … …  
    307307### Why is it so ? ### 
    308308 
    309 There are two things you need to know to understand the problem. 
     309The problem originates from the combination of two facts. 
    310310 
    311311'''First''' 
    … …  
    316316 
    317317'''The actual problem''' 
    318 When you try to use MOSAIX interpolation weights and restart LMDZ from a simulation with an o2a.nc file produced by MOSAIC embedded in the LMDZ restarts, you will get wrong values for the interpolation of quantities located at the points where the coastlines differ. This can result in numerical instability and the code blowing or, much worse,false balances but the code running fine ! 
     318When you try to use MOSAIX interpolation weights and restart LMDZ from a simulation with an o2a.nc file produced by MOSAIC embedded in the LMDZ restarts, you will get wrong values for the interpolation of quantities located at the points where the coastlines differ. This can result in numerical instability and the code blowing or, much worse, imbalance in the fluxes between ocean and atmosphere but the code running fine ! 
    319319 
    320320### The trick to get around this ###