[ecco-support] VT closure North Atlantic

[Helene Asbjørnsen]

Hi,



I was wondering if I could get some pointers on how to correctly calculate meridional volume transports across zonal lines on the ECCOv4 native grid.



I’ve been looking at calc_MeridionalTransports.m, which is helpful. But I ultimately want to end up with a full 3D velocity/VT field for the North Atlantic to do further operations on (so only ending up with one total transport value at each latitude is not ideal).





Some details:

I’ve extracted face 1 and 5 and pieced the fields together (recognising that VVEL is -UVEL and dx is dy for face 5). I’ve tried to integrate transports along the x-dimension of the extracted North Atlantic area, but also along near zonal and meridional lines based on output from gcmfaces_lines_zonal.m.



I end up not getting a near zero net transport at around 62N in the North Atlantic. The imbalance is large - around 6 Sv or so, and seems to originate from the part of the section east of Greenland.





All help is much appreciated,

Helene

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.mit.edu/pipermail/ecco-support/attachments/20220304/1b81fdf7/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: NorthAtlantic_mask.png
Type: image/png
Size: 28210 bytes
Desc: NorthAtlantic_mask.png
URL: <http://mailman.mit.edu/pipermail/ecco-support/attachments/20220304/1b81fdf7/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: VT_closure_issue.png
Type: image/png
Size: 101492 bytes
Desc: VT_closure_issue.png
URL: <http://mailman.mit.edu/pipermail/ecco-support/attachments/20220304/1b81fdf7/attachment-0003.png>