Changes between Initial Version and Version 6 of Ticket #1646


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Timestamp:
2017-09-28T23:09:06+02:00 (3 years ago)
Author:
nicolasmartin
Comment:

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  • Ticket #1646

    • Property Owner changed from NEMO team to jamesharle
    • Property Keywords DOM SCO added; domzgr zgr sco removed
    • Property Status changed from new to assigned
    • Property Cc jamesharle added
  • Ticket #1646 – Description

    initial v6  
    11Having had a look at the NOCL set up of a high resolution AMM60 configuraton I've come across a possible pit fall concerning the choice of parameters in the Furner-Siddorn vertical coordinates. See the attached figures of the top grid box depth (e3t) using the Siddorn-Furner sigma coords for hc=150 and hc=50 (50 being the default shipped with NEMO for the AMM12 domain). Spot the discontinuity! 
     2 
     3{{{#!div style='text-align: center' 
     4[[Image(fs_hc_150.png)]][[Image(fs_hc_50.png)]] 
     5}}} 
    26 
    37From reading the code - it looks like the fixed surface grid box depth (rn_zs=1m in AMM60) and stretched coordinates come into play at depths > hc. Anything less than the hc depth and we're in pure sigma - so as AMM60 has only 50 wet vertical levels - top grid box (e3t) is going to just under 3m at depths approaching 150m (i.e. hc=150). And that's why hc = 50 looks as it should!