[MITgcm-support] MITgcm-support Digest, Vol 128, Issue 33
李志远
oceanlizy at 163.com
Sat Mar 1 09:56:56 EST 2014
thank you so much for your quick reply , Dimitris Menemenlis and Michael Spall !
I will think about your precious advice , and tell you my latest result .
best regards !
At 2014-02-27 01:40:08,mitgcm-support-request at mitgcm.org wrote:
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>Today's Topics:
>
> 1. is it feasible to use tRef, sRef as initial conditions (???)
> 2. Re: is it feasible to use tRef, sRef as initial conditions
> (Dimitris Menemenlis)
> 3. Re: is it feasible to use tRef, sRef as initial conditions
> (Michael Spall)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Thu, 27 Feb 2014 01:15:05 +0800 (CST)
>From: ??? <oceanlizy at 163.com>
>To: MITgcm <mitgcm-support at mitgcm.org>
>Subject: [MITgcm-support] is it feasible to use tRef, sRef as initial
> conditions
>Message-ID: <6e3f6d73.77.1446f314c0e.Coremail.oceanlizy at 163.com>
>Content-Type: text/plain; charset="gbk"
>
>From: Li zhiyuan <oceanlizy at 163.com>
>To: MITgcm <mitgcm-support at mitgcm.org>
>Subject:"is it feasible to use tRef,sRef as initial conditions "my dear MITgcm users:
> There had been a question troubled me for a long time . I used mitgcm to simulate a wind_diriven circulation in an semi-enclosed domain ,such as " N24-N41,E117-E132" . When I use a pre-processed initial temperature and salt input file (such as Levitus 01 datas) ,the model run some steps then occured "Nan" in the STDOUT file ,but when I use
> " tRef= 26.5, 25.5, 24.4, 23.1, 21.9,
> 20.5, 18.7, 16.4, 13.6, 11.3,
> 8.9, 6.5, 4.6, 4.6, 4.6,
> 4.6, 4.6, 4.6, 4.6, 4.6,
> 4.6, 4.6, 4.6, 4.6, 4.6,
> 4.6, 4.6, 4.6, 4.6, 4.6,
> 4.6, 4.6, 4.6, 4.6, 4.6,
> 4.6,
> sRef= 33.28, 33.59, 33.87, 34.13, 34.36,
> 34.53, 34.61, 34.64, 34.56, 34.48,
> 34.39, 34.35, 34.38, 34.38, 34.38,
> 34.38, 34.38, 34.38, 34.38, 34.38,
> 34.38, 34.38, 34.38, 34.38, 34.38,
> 34.38, 34.38, 34.38, 34.38, 34.38,
> 34.38, 34.38, 34.38, 34.38, 34.38,
> 34.38,
> the model run without errors . I have learnd that this maybe a CFL problem , because the initial conditions are not smooth enough . But I have smooth the data for many times , I think it is smooth. But things went wrong !!! I do not know how to make the initial conditions "enough smooth" .
>So ,I doubt that is it feasible for me to just use the above " tRef ,sRef " as a initial conditions . I want to force the model with wind force, surface heatflux and salt flux for few years until the model run steadily ,when I can get a steady state " temperature , salt filed ", and
>the" u,v velocity filed" . I guess if feasible , it will take a much longer time to get such a steady state . Am I right ?
>
>
> Any quick reply will be great appreciated !
>Yours Li zhiyuan
>Best regards !
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>------------------------------
>
>Message: 2
>Date: Wed, 26 Feb 2014 09:29:10 -0800
>From: Dimitris Menemenlis <dmenemenlis at gmail.com>
>To: MITgcm Support <mitgcm-support at mitgcm.org>
>Subject: Re: [MITgcm-support] is it feasible to use tRef, sRef as
> initial conditions
>Message-ID: <746D4F81-C5C8-4BDA-B5B1-7369DA31DE42 at gmail.com>
>Content-Type: text/plain; charset="utf-8"
>
>Typically when we initialize model from a climatology, we have to use
>much shorter time step initially, e.g., first day or so, to reduce CFL shocks.
>As you ruhn the model check the "advcfl" diagnostics in the STDOUT
>files and make sure they remain below about 0.5. Then you can gradually
>increase time step. The CFL violation often occurs not because the
>initial fields are not sufficiently smooth in the horizontal, but rather because
>there are vertical instabilities in these fields, i.e., dense water over light water.
>
>On Feb 26, 2014, at 9:15 AM, ??? <oceanlizy at 163.com> wrote:
>
>> From: Li zhiyuan <oceanlizy at 163.com>
>> To: MITgcm <mitgcm-support at mitgcm.org>
>> Subject:"is it feasible to use tRef,sRef as initial conditions "
>> my dear MITgcm users:
>> There had been a question troubled me for a long time . I used mitgcm to simulate a wind_diriven circulation in an semi-enclosed domain ,such as " N24-N41,E117-E132" . When I use a pre-processed initial temperature and salt input file (such as Levitus 01 datas) ,the model run some steps then occured "Nan" in the STDOUT file ,but when I use
>> " tRef= 26.5, 25.5, 24.4, 23.1, 21.9,
>> 20.5, 18.7, 16.4, 13.6, 11.3,
>> 8.9, 6.5, 4.6, 4.6, 4.6,
>> 4.6, 4.6, 4.6, 4.6, 4.6,
>> 4.6, 4.6, 4.6, 4.6, 4.6,
>> 4.6, 4.6, 4.6, 4.6, 4.6,
>> 4.6, 4.6, 4.6, 4.6, 4.6,
>> 4.6,
>> sRef= 33.28, 33.59, 33.87, 34.13, 34.36,
>> 34.53, 34.61, 34.64, 34.56, 34.48,
>> 34.39, 34.35, 34.38, 34.38, 34.38,
>> 34.38, 34.38, 34.38, 34.38, 34.38,
>> 34.38, 34.38, 34.38, 34.38, 34.38,
>> 34.38, 34.38, 34.38, 34.38, 34.38,
>> 34.38, 34.38, 34.38, 34.38, 34.38,
>> 34.38,
>> the model run without errors . I have learnd that this maybe a CFL problem , because the initial conditions are not smooth enough . But I have smooth the data for many times , I think it is smooth. But things went wrong !!! I do not know how to make the initial conditions "enough smooth" .
>> So ,I doubt that is it feasible for me to just use the above " tRef ,sRef " as a initial conditions . I want to force the model with wind force, surface heatflux and salt flux for few years until the model run steadily ,when I can get a steady state " temperature , salt filed ", and
>> the" u,v velocity filed" . I guess if feasible , it will take a much longer time to get such a steady state . Am I right ?
>>
>> Any quick reply will be great appreciated !
>> Yours Li zhiyuan
>> Best regards !
>
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>------------------------------
>
>Message: 3
>Date: Wed, 26 Feb 2014 07:39:59 -1000
>From: Michael Spall <mspall at whoi.edu>
>To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
>Cc: MITgcm Support <mitgcm-support at mitgcm.org>
>Subject: Re: [MITgcm-support] is it feasible to use tRef, sRef as
> initial conditions
>Message-ID: <0C1D0958-8AF9-4B04-BC10-F6E420AE4F45 at whoi.edu>
>Content-Type: text/plain; charset="utf-8"
>
>I would also worry about initializing with a density gradient along a boundary
>without a balanced flow through the boundary. You will get large vertical
>velocities next to the boundary, which can cause the model to blow up.
>
>Mike
>
>Sent from my iPad
>
>> On Feb 26, 2014, at 7:29 AM, Dimitris Menemenlis <dmenemenlis at gmail.com> wrote:
>>
>> Typically when we initialize model from a climatology, we have to use
>> much shorter time step initially, e.g., first day or so, to reduce CFL shocks.
>> As you ruhn the model check the "advcfl" diagnostics in the STDOUT
>> files and make sure they remain below about 0.5. Then you can gradually
>> increase time step. The CFL violation often occurs not because the
>> initial fields are not sufficiently smooth in the horizontal, but rather because
>> there are vertical instabilities in these fields, i.e., dense water over light water.
>>
>>> On Feb 26, 2014, at 9:15 AM, ??? <oceanlizy at 163.com> wrote:
>>>
>>> From: Li zhiyuan <oceanlizy at 163.com>
>>> To: MITgcm <mitgcm-support at mitgcm.org>
>>> Subject:"is it feasible to use tRef,sRef as initial conditions "
>>> my dear MITgcm users:
>>> There had been a question troubled me for a long time . I used mitgcm to simulate a wind_diriven circulation in an semi-enclosed domain ,such as " N24-N41,E117-E132" . When I use a pre-processed initial temperature and salt input file (such as Levitus 01 datas) ,the model run some steps then occured "Nan" in the STDOUT file ,but when I use
>>> " tRef= 26.5, 25.5, 24.4, 23.1, 21.9,
>>> 20.5, 18.7, 16.4, 13.6, 11.3,
>>> 8.9, 6.5, 4.6, 4.6, 4.6,
>>> 4.6, 4.6, 4.6, 4.6, 4.6,
>>> 4.6, 4.6, 4.6, 4.6, 4.6,
>>> 4.6, 4.6, 4.6, 4.6, 4.6,
>>> 4.6, 4.6, 4.6, 4.6, 4.6,
>>> 4.6,
>>> sRef= 33.28, 33.59, 33.87, 34.13, 34.36,
>>> 34.53, 34.61, 34.64, 34.56, 34.48,
>>> 34.39, 34.35, 34.38, 34.38, 34.38,
>>> 34.38, 34.38, 34.38, 34.38, 34.38,
>>> 34.38, 34.38, 34.38, 34.38, 34.38,
>>> 34.38, 34.38, 34.38, 34.38, 34.38,
>>> 34.38, 34.38, 34.38, 34.38, 34.38,
>>> 34.38,
>>> the model run without errors . I have learnd that this maybe a CFL problem , because the initial conditions are not smooth enough . But I have smooth the data for many times , I think it is smooth. But things went wrong !!! I do not know how to make the initial conditions "enough smooth" .
>>> So ,I doubt that is it feasible for me to just use the above " tRef ,sRef " as a initial conditions . I want to force the model with wind force, surface heatflux and salt flux for few years until the model run steadily ,when I can get a steady state " temperature , salt filed ", and
>>> the" u,v velocity filed" . I guess if feasible , it will take a much longer time to get such a steady state . Am I right ?
>>>
>>> Any quick reply will be great appreciated !
>>> Yours Li zhiyuan
>>> Best regards !
>>
>> _______________________________________________
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>> MITgcm-support at mitgcm.org
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