[MITgcm-support] how to calculate the relative velocity in the calculation of wind stress in the sea ice areas

Thu Jun 30 10:55:15 EDT 2016

Hello , Martin

    How to calculate wind stress over the ocean where is covered by the sea ice ? and the wind stress over the sea  ice ?

    When the relative wind is considered, how to calculate the relative velocity in the calculation of wind stress in the sea ice covered areas ?

Does the wind used in calculation of wind stress  read directly from the input atmospheric forcing without any  processings in the package of "seaice", except the interpolation?

Thank you  very much !

Yang 

From: mitgcm-support-request
Date: 2016-05-24 00:00
To: mitgcm-support
Subject: MITgcm-support Digest, Vol 155, Issue 15
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Today's Topics:

   1. if the ocean surface current is subtracted from the
      atmospheric wind in calculating of latent and sensible heat
      fluxes when the realtive wind is concerned (wuyang at nuist.edu.cn)
   2. Re: Read NetCDF data (Internal Waves) (Alejandro Jim?nez Rico)
   3. Re: if the ocean surface current is subtracted from the
      atmospheric wind in calculating of latent and sensible heat
      fluxes when the realtive wind is concerned (Martin Losch)
   4. Re: Read NetCDF data (Internal Waves) (Martin Losch)
   5. Re: Read NetCDF data (Internal Waves) (Roland Young)

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Message: 1
Date: Mon, 23 May 2016 22:17:07 +0800
From: "wuyang at nuist.edu.cn" <wuyang at nuist.edu.cn>
To: mitgcm-support <mitgcm-support at mitgcm.org>
Subject: [MITgcm-support] if the ocean surface current is subtracted
from the atmospheric wind in calculating of latent and sensible heat
fluxes when the realtive wind is concerned
Message-ID: <2016052322170641119614 at nuist.edu.cn>
Content-Type: text/plain; charset="gb2312"

Hello All,

The ocean surface current is subtracted from the atmospheric wind in the calculation of wind stress when the relative wind is set as "TRUE" in the file of data.exf.

And the question is that  if the ocean surface current is also subtracted from the atmospheric wind in calculating of latent and sensible heat fluxes when the  realtive wind is concerned ?

Thanks 

Yang

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Message: 2
Date: Mon, 23 May 2016 14:50:23 +0000
From: Alejandro Jim?nez Rico <paulexca at hotmail.com>
To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] Read NetCDF data (Internal Waves)
Message-ID: <DUB127-W542E0DD7A366858B77195D84E0 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"

Hi,
First of all: Really thank you for helping me. This is going tougher than I expected and you are very useful :)
Right now I am trying to glue the two .nc files that I want to read and process, but the mitgcm scripc didn't work (or I failed using it), it shows up an erro message and a new 'global' file completely empty.
Any ideas?
Thank you!Alejandro     
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Message: 3
Date: Mon, 23 May 2016 16:50:43 +0200
From: Martin Losch <martin.losch at awi.de>
To: MITgcm Support <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] if the ocean surface current is
subtracted from the atmospheric wind in calculating of latent and
sensible heat fluxes when the realtive wind is concerned
Message-ID: <C4A7E01F-C2C1-486E-A60F-95135866A97C at awi.de>
Content-Type: text/plain; charset="utf-8"

Yang,

the answer is ?yes? (as far as I can tell, but you can check for yourself): after reading uwind (and vwind) in exf_getffields.F a new uwind is computed as
           uwind(i,j,bi,bj) = uwind(i,j,bi,bj) - 0.5 _d 0 *
     &          (uVel(i,j,1,bi,bj)+uVel(i+1,j,1,bi,bj))
and from then on uwind (and vwind) are used for all computations of wind stress and friction velocities (that go into latent and sensible heat, first in exf_wind.F and then in exf_bulkformulae.F).

Martin

> On 23 May 2016, at 16:17, wuyang at nuist.edu.cn wrote:
> 
> 
> Hello All,
> 
> The ocean surface current is subtracted from the atmospheric wind in the calculation of wind stress when the relative wind is set as "TRUE" in the file of data.exf.
> 
> And the question is that  if the ocean surface current is also subtracted from the atmospheric wind in calculating of latent and sensible heat fluxes when the  realtive wind is concerned ?
> 
> 
> Thanks 
> 
> Yang
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support

------------------------------

Message: 4
Date: Mon, 23 May 2016 17:03:18 +0200
From: Martin Losch <martin.losch at awi.de>
To: MITgcm Support <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] Read NetCDF data (Internal Waves)
Message-ID: <525FE3DC-9550-4ED2-839F-753CAEA57309 at awi.de>
Content-Type: text/plain; charset="iso-8859-1"

Hi Alejandro, 
it would be easier to help if you provided more information: (1) the script that you are using (gluemncbig?) (2) the full command line (3) the error message. 
Here a wild guess of what you might need: an example of how to use gluemncbig. I use the output that I generated on my laptop by running a verification experiment: cd verification && ./testresport -t isomip && cd isomip/tr_run.htd/mnc_test_0001
>> ls state*.nc
state.0000008640.t001.nc state.0000008640.t004.nc state.0000008640.t007.nc
state.0000008640.t002.nc state.0000008640.t005.nc state.0000008640.t008.nc
state.0000008640.t003.nc state.0000008640.t006.nc
>> ../../../../utils/python/MITgcmutils/scripts/gluemncbig -o state.0000008640.glob.nc state.0000008640.t00*
Tiled dimensions: Xp1 Y X Yp1
Record dimension: T
Writing non-record variables
Writing 2 records: ..
>> ls *.glob.nc
state.0000008640.glob.nc
>>

Hope that helps,
Martin

> On 23 May 2016, at 16:50, Alejandro Jim?nez Rico <paulexca at hotmail.com> wrote:
> 
> Hi,
> 
> First of all: Really thank you for helping me. This is going tougher than I expected and you are very useful :)
> 
> Right now I am trying to glue the two .nc files that I want to read and process, but the mitgcm scripc didn't work (or I failed using it), it shows up an erro message and a new 'global' file completely empty.
> 
> Any ideas?
> 
> Thank you!
> Alejandro
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support

------------------------------

Message: 5
Date: Mon, 23 May 2016 15:07:23 +0000
From: Roland Young <Roland.Young at physics.ox.ac.uk>
To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] Read NetCDF data (Internal Waves)
Message-ID: <01BA5583-2032-4067-8DB7-B01D0FA908B0 at physics.ox.ac.uk>
Content-Type: text/plain; charset="windows-1252"

Hi Alejandro,

The glueing script should be fairly reliable. If you have two output files output.t001.nc and output.t002.nc then the following should combine them into a global file:

gluemncbig -o output.global.nc output.t001.nc output.t002.nc

You have to include all the tiles (so if you have four output files t001 through t004 and try to glue only two of them then it won't work). It?s a python script, so you must have this installed (note: I don?t think it will work with Python v3).

If this gives you errors I suggest posting exactly what commands you typed and what the output was.

Roland

On 23 May 2016, at 15:50, Alejandro Jim?nez Rico <paulexca at hotmail.com<mailto:paulexca at hotmail.com>> wrote:

Hi,

First of all: Really thank you for helping me. This is going tougher than I expected and you are very useful :)

Right now I am trying to glue the two .nc files that I want to read and process, but the mitgcm scripc didn't work (or I failed using it), it shows up an erro message and a new 'global' file completely empty.

Any ideas?

Thank you!
Alejandro
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