[MITgcm-support] Open boundary conditions using ECCO data

Tue Apr 25 21:14:54 EDT 2017

Hi Martin,

Thanks for your kind answer, which is the first reply I received :)

Here is another question about how to get hFacW and hFacS. I am using the ECCO-v4 1/2 degree interpolted fields (ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/interp_monthly/). So should I calculate hFacW and hFacS by myself  based on the interpolated grid faces rather than use them directly under ftp://mit.ecco-group.org/ecco_for_las/version_4/grids/grids_output/ECCOv4/ ? (which I guess for the original ECCO grid not interpolated grid)

All the best,

Delei

________________________________
From: Martin Losch <Martin.Losch at awi.de>
Sent: 24 April 2017 15:53:39
To: MITgcm Support
Subject: Re: [MITgcm-support] Open boundary conditions using ECCO data

Hi Delei Li,

did you get an answer?

I think you can ignore the bolus velocities. They are computed from the Gent-McWilliams Eddy parameterisation and represent the eddy flux of a tracer.

The mass weighted velocities are hFacW*UVEL and hFacS*VVEL. You should probably back out UVEL and VVEL and use them to drive you model.

Martin
> On 14 Apr 2017, at 08:05, ?? ? <Deleili at hotmail.com> wrote:
>
> Hi all,
>
> I am running a regional version of MITgcm with exf and obcs packages turned on. I would like to use global ECCO u/v/t/s data (ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/interp_monthly/) as the boundary forcings of my regional model.
> However, I have some problems with the forcing data preparation.
>
> (1) There are two kinds of velocity in ECCO v4r2 dataset: Mass-Weighted Comp of Velocity and Bolus Velocity, which one should I use as the velocity boundary forcings?  I prefer the former one, but not very sure about it.
> (2) As the velocity is available in form of mass-weighted, should I make some conversion on it and then interpolate to target  grids?  Or directly interpolate mass-weighted velocity to target grids at vertical levels of each boundary?
>
> Does anyone have any suggestion on the questions? Your help would be much appreciated.
>
> Best regards,
> Delei Li
> ----------------------------------------------------------------
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> Institute of Oceanology, Chinese Academy of Sciences,
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