[ecco-support] [EXTERNAL] Full pressure in ECCO4

[Gabriel Wolf]

Hi Ou,

Thank you for your reply. I didn’t realise I have to use PHIHYDcR instead of PHIHYD. Sanity check now works, geostrophic flow using derivative of p_full_fixeddep now gives me very similar values to UVEL and VVEL. So thanks for your help!

Best regards,
Gabriel

> On 25 Jun 2020, at 18:35, Wang, Ou (US 329B) <ou.wang at jpl.nasa.gov> wrote:
> 
> Gabriel,
> 
> The full 3d pressure in meters (~dbar) can be calculated as 
> P_full=(PHrefC+PHIHYD)/g, where g=9.81 m/s2
> 
> Since the model uses the r* vertical coordinate, the depth of each cell in vertical changes with time. So if you want to calculate the pressure at fixed depth, use PHIHYDcR in replace of PHIHYD
> P_full_fixeddep = (PHrefC+PHIHYD)/g.
> PHIHYDcR is provided in ECCO V4 Release3_alt. 
> 
> Regards,
> Ou 
> 
> is the 3d full pressure in m2/s2. Divide by g(=9.81m/s2) to convert it to meters (~dbar). 
> 
> On 6/23/20, 2:20 AM, "ecco-support-bounces at mit.edu on behalf of Gabriel Wolf" <ecco-support-bounces at mit.edu on behalf of g.a.wolf at reading.ac.uk> wrote:
> 
>    Dear ECCO teams,
> 
>    I’m doing some calculations for which I need the correct full pressure. I’m struggling to find information on this, so not sure I really get this right.
>    I’m using ECCO version4 release 3alt (nctiles_monthly). As far as I understand it, the full 3d pressure P_full in dbar is calculated as
> 
>    P_full = (PHrefC + PHIHYD + SSH * g) * rhoConst * 1e-4
> 
>    with the notation as in the actual dataset, with rhoConst = 1029, g=9.81, PHrefC the 1d hydrostatic reference profile, PHIHYD the 3d anomaly from hydrostatic reference profile and SSH the sea surface height (contributing via the different sea surface heights).
>    Is this the correct procedure? I would be happy if you could confirm this or tell me if I got this wrong.
> 
>    Best regards,
>    Gabriel
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