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<div>Hello Tatsu,</div>
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<div>NVELMASS and EVELMASS are not native model velocities and thus may not be suitable for studying integrated quantities or doing budget analysis. They are the northward and eastward geometry-weighted velocities that are converted from native model variables
UVELMASS and VVELMASS; the latter two should be used instead to compute the meridional transport. The Matlab toolbox gcmfaces <a href="https://gcmfaces.readthedocs.io/en/latest/" target="_blank" rel="noopener noreferrer">https://gcmfaces.readthedocs.io/en/latest/</a> has
a built-in script to compute the meridional transport using UVELMASS and VVELMASS. The particular Matlab script is
<a href="https://github.com/gaelforget/gcmfaces/blob/master/gcmfaces_calc/calc_MeridionalTransport.m">
https://github.com/gaelforget/gcmfaces/blob/master/gcmfaces_calc/calc_MeridionalTransport.m</a>.</div>
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<div>Cheers,</div>
<div>Ou Wang</div>
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<span style="font-weight:bold">From: </span><<a href="mailto:ecco-support-bounces@mit.edu">ecco-support-bounces@mit.edu</a>> on behalf of Tatsu Monkman <<a href="mailto:tdmonkman@uchicago.edu">tdmonkman@uchicago.edu</a>><br>
<span style="font-weight:bold">Reply-To: </span>"ECCO support list, wider membership" <<a href="mailto:ecco-support@mit.edu">ecco-support@mit.edu</a>><br>
<span style="font-weight:bold">Date: </span>Monday, November 19, 2018 at 10:47 AM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:ecco-support@mit.edu">ecco-support@mit.edu</a>" <<a href="mailto:ecco-support@mit.edu">ecco-support@mit.edu</a>><br>
<span style="font-weight:bold">Subject: </span>[ecco-support] Artifacts in global meridional overturning circulation<br>
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<div dir="ltr">Hello,
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<div>I'm a current graduate student at the University of Chicago working with the latest ECCO v4r3 data output and am having some issues. When I do a global integration of NVELMASS tiles multiplied by DRF and DXG and then integrate by depth from the surface
I see bright bands developing at several latitudes. This could be a simple calculation mistake on my end and I was wondering if this has been seen before and if there is a known solution. I suspect this may have to do with tiles near land-sea boundaries, but
I assumed that NVELMASS was weighted for that, and have tried NVEL multiplied by hFacS with similar results. I am performing all of these calculations on NVEL and GRID data arrays extracted from Version4 Release3 on
<a href="ftp://ecco.jpl.nasa.gov/">ftp://ecco.jpl.nasa.gov/</a> . I've attached a plot of my output for reference.</div>
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<div>I am running ecco through the python 2.7 on OS Mojave 10.14.1</div>
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<div>Thanks!</div>
<div>-Tatsu Monkman</div>
<div>University of Chicago</div>
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