[MITgcm-support] Open boundary conditions using ECCO data

[Longjiang Mu]

Hi Delei,

hFacS or hFacW ... are generated during model initialization.
I think for new grids maybe you'll need UVEL or VVEL, then you can try 
to fill the grids where hFacW/hFacS < 1.0 with UVEL or VVEL.
If you just have UVELMASS or VVELMASS, maybe UVEL can be got by 
UVEL=UVELMASS/hFacW.
And don't forget to balance the boundary flux after that.

Longjiang
在 2017年04月27日 00:00, mitgcm-support-request at mitgcm.org 写道:
> 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
>> ----------------------------------------------------------------
>> Key Laboratory of Ocean Circulation and Waves,
>> Institute of Oceanology, Chinese Academy of Sciences,
>> Nanhai Street No. 7, 266071, Qingdao, P.R. China
>> Telephone: 0532-82898839
>>
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