[ecco-support] [EXTERNAL] Question on ECCO velocity variables

[Wang, Ou (US 329B)]

Damien,

“Geometry-weighted” means a variable is weighted by the fraction of a grid cell in vertical which is wet, namely hFacC, hFacW, or hFacS in the model. They are unitless, ranging from 0 to 1 for a fully dry and wet point and in between for partial cells. “Geometry-weighted” replaces “Mass-weighted” that was used in older versions, as the weighting is not in mass unit and therefore we decided to use “Geometry Mass-weighted” instead.

EVEL, NVEL, and WVELMASS are the E-W, N-S, and bottom-up 3D velocity fields. WVELMASS is just an alias of WVEL.

Cheers,
Ou

From: <ecco-support-bounces at mit.edu> on behalf of ddesbruy <Damien.Desbruyeres at ifremer.fr>
Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu>
Date: Thursday, October 1, 2020 at 6:44 AM
To: "ecco-support at mit.edu" <ecco-support at mit.edu>
Subject: [EXTERNAL] [ecco-support] Question on ECCO velocity variables


Dear ECCO team,

I have a quick question regarding the ECCO interpolated velocity fields (Version 4 Release 4, interp_monthly).

What does "geometry-weighted" exactly mean ? I have also found some other mentions of "mass-weighted" velocities in older versions. I am not entirely sure to what they correspond (in particular when considering the regular interpolated fields).

My aim is to use the north-south, east-west, bottom-up 3D velocity fields. I have considered using EVEL, NVEL, and WVELMASS (there is no corresponding WVEL) and I just want to make sure that these are the variables to use.

Many thanks in advance for your reply,

Damien
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.mit.edu/pipermail/ecco-support/attachments/20201001/1be13efc/attachment.html