[ecco-support] Vertical grid in ECCOv4 r2

[gael forget]

Hi Dave,

as explained by David differences between z versus z* should generally be negligible. One side note though: if your boundary condition is to the North of 69 degree South then you may want to use native grid fields from ‘nctiles_climatology/' via ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/doc/eccov4_lonlat.m instead of the ‘interp_climatology/' contents; this way you would have full control of interpolation procedures. For example to read XC, YC, and THETA this way in Matlab:
> fldLoc='nctiles_grid/GRID';
> XC=eccov4_lonlat(fldLoc,'XC',1);
> YC=eccov4_lonlat(fldLoc,'YC',1);
> fldLoc='nctiles_climatology/THETA';
> THETA=double(eccov4_lonlat(fldLoc,'THETA',[]));

Cheers,
Gael


On Mar 24, 2017, at 1:28 PM, David Ferreira <d.g.ferreira at reading.ac.uk> wrote:

> Hi Dave,
> Wery likely the field haven't been interpolated back onto the z grid (Gael could confirm this or not).
> But, the difference between z and z* is very small anyway, typically less that the free surface height. So for many purposes, it does not matter much.
> My guess is that for a northern boundary restoring field, it would not be a big deal to interpret the z* values as being at the z level.
> cheers,
> david
> 
> 
> ________________________________________
> From: ecco-support-bounces at mit.edu [ecco-support-bounces at mit.edu] on behalf of Munday, Dave [danday at bas.ac.uk]
> Sent: Friday, March 24, 2017 11:23 AM
> To: ecco-support at mit.edu
> Subject: [ecco-support] Vertical grid in ECCOv4 r2
> 
> Hi folks,
> 
> I’ve been looking into using ECCOv4 to provide stratification for a restoring condition at the northern boundary of a Southern Ocean model. I want a climatology so that I can run the other model for a long time and the interp_climatology fields that I found on the ftp site look ideal.
> 
> In poking around, however, I noticed that ECCOv4 uses rstar coordinates, but that all of the fields give the same depth in the output files. Is this because the interp_climatology has been averaged back on to that vertical grid? Or do I need to worry about the actual vertical locations of the temperature/salinity points?
> 
> Many thanks,
> 
> Dave
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