<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Dave,<div><br></div><div>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 <a href="ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/doc/eccov4_lonlat.m">ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/doc/eccov4_lonlat.m</a> 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:</div><div></div><blockquote type="cite"><div>fldLoc='nctiles_grid/GRID';</div><div>XC=eccov4_lonlat(fldLoc,'XC',1);<br>YC=eccov4_lonlat(fldLoc,'YC',1);<br>fldLoc='nctiles_climatology/THETA';</div><div>THETA=double(eccov4_lonlat(fldLoc,'THETA',[]));</div></blockquote><div><br></div><div>Cheers,</div><div>Gael</div><div><br></div><div><br><div><div>On Mar 24, 2017, at 1:28 PM, David Ferreira <<a href="mailto:d.g.ferreira@reading.ac.uk">d.g.ferreira@reading.ac.uk</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi Dave,<br>Wery likely the field haven't been interpolated back onto the z grid (Gael could confirm this or not).<br>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.<br>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.<br>cheers,<br>david<br><br><br>________________________________________<br>From: <a href="mailto:ecco-support-bounces@mit.edu">ecco-support-bounces@mit.edu</a> [<a href="mailto:ecco-support-bounces@mit.edu">ecco-support-bounces@mit.edu</a>] on behalf of Munday, Dave [<a href="mailto:danday@bas.ac.uk">danday@bas.ac.uk</a>]<br>Sent: Friday, March 24, 2017 11:23 AM<br>To: <a href="mailto:ecco-support@mit.edu">ecco-support@mit.edu</a><br>Subject: [ecco-support] Vertical grid in ECCOv4 r2<br><br>Hi folks,<br><br>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.<br><br>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?<br><br>Many thanks,<br><br>Dave<br>________________________________<br> This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system.<br>________________________________<br><br>_______________________________________________<br>ecco-support mailing list<br><a href="mailto:ecco-support@mit.edu">ecco-support@mit.edu</a><br>http://mailman.mit.edu/mailman/listinfo/ecco-support<br><br>_______________________________________________<br>ecco-support mailing list<br>ecco-support@mit.edu<br>http://mailman.mit.edu/mailman/listinfo/ecco-support<br></blockquote></div><br></div></body></html>