[MITgcm-support] 回复： MITgcm-support Digest, Vol 120, Issue 7

Sat Jun 8 23:07:27 EDT 2013

Hi, all:
    I have run the model for several days, and the boundary value is now correctly assigned at every step, though there is still unexpected noisy in the simulated field which seems start from the southern-western corner, and propagate towards the inner part. I have attached the sea ice thickness figure, and the noisy signal is clear at day 5. I thought the noisy came from the calculation of ice stress and then the ice velocity.
    Does anybody know how to handle this kind problem? 

Thanks,
liqun

________________________________
 发件人： "mitgcm-support-request at mitgcm.org" <mitgcm-support-request at mitgcm.org>
收件人： mitgcm-support at mitgcm.org 
发送日期： 2013年6月9日, 星期日, 12:00 上午
主题: MITgcm-support Digest, Vol 120, Issue 7

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Today's Topics:

   1. Re: MITgcm online tutorial problems (Menemenlis, Dimitris (3248))
   2. OBCS for sea ice! (liqun_hu818 at yahoo.com.cn)

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Message: 1
Date: Fri, 7 Jun 2013 18:30:46 +0000
From: "Menemenlis, Dimitris (3248)" <Dimitris.Menemenlis at jpl.nasa.gov>
To: "Zhang, Hong (3248-Affiliate)" <hong.zhang at ucla.edu>
Cc: MITgcm Support <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] MITgcm online tutorial problems
Message-ID: <1D69D054-AE74-4854-8AFF-E63B69E8A25B at jpl.nasa.gov>
Content-Type: text/plain; charset="us-ascii"

Hong, thanks for quick response!

Could you also add the information below to MITgcm_contrib/high_res_cube/cube92/README.cs510<http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/high_res_cube/cube92/README.cs510>
so it's ready to go for next user.

I cc your message to support list for future reference.

Cheers

Dimitris Menemenlis
818-625-6498

On Jun 7, 2013, at 2:13 PM, "Hong Zhang" <hong.zhang at ucla.edu<mailto:hong.zhang at ucla.edu>> wrote:

On 06/07/2013 10:18 AM, Jonny Williams wrote:
Thank you very much for the welcome, Hong!

I've checked out the experiment and started going through the README file and I'm experiencing some errors which I imagine are due to the fact that I haven't downloaded the initial condition, bathymetry and forcing files as yet. I notice that the links to these contain many files so I'd be grateful if you could let me know if there is a simple way to download them and also where to put them?

I should emphasise that although I am an experienced modeller and and comfortable with UNIX/LINUX, I am a complete newbie to MITgcm. I am really looking forward to seeing what it can do!
Hi Jonny,
Some files are not necessary.
Here I list the essentail ones. As you're working on linux box,
that will make it easy, especially by use of wildcard in file names and wget.

http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/high_res_cube/cube92/
and see  readme file for instruction:
http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/high_res_cube/cube92/README.cs510?view=markup
Initial condition and bathymetry files can be found here:
http://ecco2.jpl.nasa.gov/data1/cube/run_template/
for run_template/, need
*cube78
tile*
GEBCO*

Forcing files are here:
http://ecco2.jpl.nasa.gov/data2/data/atmos/blend_forcing/cube78_forcing/
There are 2 sets of forcing fields. Basically we use JRA25 now.
So for cube78_foring/, need
DIFFKR*
runoff*

http://ecco2.jpl.nasa.gov/data2/data/atmos/jra25/
for jra25/, download
jra25*_19*
jra25*_20*

That should save a lot of traffic time and disk space.
So now you have three folders, run_template/, cube78_forcing/, and jra25/
can put them aywhere.
Then look at http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/high_res_cube/cube92/README.cs510?view=markup
need to change line 19-21, line 26-27 (link those three folders or files therein to you own work directory)
BTW, probably you need to change line 12, using some build option file for your own supercomputer to compile.
Good luck,
hong
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Message: 2
Date: Sat, 8 Jun 2013 14:06:46 +0800 (CST)
From: liqun_hu818 at yahoo.com.cn
To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
Subject: [MITgcm-support] OBCS for sea ice!
Message-ID:
    <1370671606.24732.YahooMailNeo at web15907.mail.cnb.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi, all:
??? I am now trying setup a regional ice-ocean coupled application with MITgcm checkpoint64h, OBCs are prescribed from global model products. 

??? However, there is some problem with the Vvel at the southern boundary and the Uvel at the western boundary. These two boundary value are masked by the northern and eastern sea ice velocity mask. I checked the obcs_apply_uvice.F, and commented the seaiceMaskU/V, the problem still exist. And so I changed the value of seaiceMaskU/V to 1 in theseaice_init_varia.F, this kind problem could be solved.

? ? After checking the code, I found that seaiceMaskU(i,Jsouth)=AREA(i,Jsouth)+AREA(i,Jsouth-1), and if Jsouth=1, it seems that the AREA(i,0) is set to be AREA(I,end), simila with the western boundary with Iwest=1.? 
??? Though the seaiceMaskU/V are mainly used in the dynamic solver, could there be other problems?

Best wishes,
liqun
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