[MITgcm-support] pressure from MITgcm

[Sergey Vinogradov]

Hi All!

    Jean-Michel: I attached my data file. I experimented with changing 
eos from poly3 to linear and it had no noticeable changes in the 
results. However, I didn't try anything else. I guess my offline density 
computations can have some flaws: I don't interpolate vertical density 
integral; I use constant density for the whole layer instead. I use some 
old seawater eos subroutines.
    Following Dimitris suggestion, I have added Pbar(t) to the pressure 
computation from density, also replacing the full sea-surface height 
with just the dynamic signal (dynamic signal = full ssh minus inverted 
barometer response). This changed the picture (see attached plot), 
bringing the offline pressure computation closer to one that was 
computed from totPhiHyd. Still, there is a significant difference in HF. 
I'm not sure if this would be the nonlinearity effect of  hydrostatic 
equation, as Martin suggests. Another thing I noticed that the pressure 
variability stays almost the same for all vertical layers, which implies 
a strong surface trapping of the atmospheric pressure load. Did anyone 
have somewhat similar results?
    Thanks a lot,

Sergey

Jean-Michel Campin wrote:

>Hi Sergey,
>
>Can you provide more informations about the parameters
>you are using (such as eosType, Integr_GeoPot, vertical
>discretisation, or, in short, a copy of the "data" file)
>and the way you integrate rho.g.dz ?
>
>Jean-Michel
>
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