[MITgcm-support] vertical momentum tendency

[钱钰坤]

Hi,


I might find a workaround to get instantaneous TOTWTEND (not time-mean one)
by adding the following lines:
  CALL DIAGNOSTICS_SCALE_FILL( wVel, tmpFac, 1, 'TOTWTEND',0,Nr,0,1,1,myThid )
to diagnostics_fill_state.F file, following TOTUTEND and TOTVTEND  (see here).  And
also add a call to 
  CALL DIAGNOSTICS_ADDTOLIST()
at diagnostics_main_init.F (see here).


Then I re-compile the model and run it well.  However, the tendency of w TOTWTEND
seems to be much larger than expected in my case:



I am not sure DIAGNOSTICS_SCALE_FILL really do the time-differencing.  Is this
the right way to get TOTWTEND?  Why it looks so large in magnitude?



  Best regards 
 
-----------------------------------------
Yu-Kun Qian (钱钰坤)South China Sea Institute of Oceanology
Sun Yat-sen University
Xingang West Road, Haizhu District
Guangzhou, P.R. China
Email: qianyukun at scsio.ac.cn, qianyk at mail3.sysu.edu.cn
   


 
------------------ 原始邮件 ------------------
发件人: "Matthew Mazloff"<mmazloff at ucsd.edu>;
发送时间: 2022年5月18日(星期三) 上午9:47
收件人: "MITgcm-support"<mitgcm-support at mitgcm.org>; 

主题: Re: [MITgcm-support] vertical momentum tendency

 

Hi Haoron

Dump snapshots at the interval you need to get dW/dt.


For example daily tendency would be derived from 
   frequency(1) = -86400.0,
   timePhase(1) = 0.0,
   fields(1,1) = 'WVEL    ',
   filename(1) = ‘WvelSnap’,




Matt


On May 17, 2022, at 5:47 PM, 钱钰坤 <qianyk at mail3.sysu.edu.cn> wrote:

Hi Haoran,


Thank you for your help.  But I don't really know how these two diagnostics
could help in deriving the tendency of w (unit of acceleration).


My understanding is that these two diagnostics are useful in calculating the
eddy momentum flux when the output is time-average <> one.  For example,
<w'u'> = <wu> - <w><u>
If we output monthly mean wu, w, and u, we can get eddy flux <w'u'> for this
month.



  Best regards 
 
-----------------------------------------
Yu-Kun Qian (钱钰坤)South China Sea Institute of Oceanology
Sun Yat-sen University
Xingang West Road, Haizhu District
Guangzhou, P.R. China
Email: qianyukun at scsio.ac.cn, qianyk at mail3.sysu.edu.cn
   
 

 
 
 
------------------ 原始邮件 ------------------
发件人: "Haoran Xu"<xu1jian2wei3 at 163.com>;
发送时间: 2022年5月17日(星期二) 晚上7:40
收件人: "MITgcm-support"<mitgcm-support at mitgcm.org>; 

主题: Re: [MITgcm-support] vertical momentum tendency

 

Hi，
 If I understand correctly,these two diagnostics could help.




WU_VEL  |WU      LR|m.m/s^2         |Vertical Transport of Zonal Momentum WV_VEL  |WV      LR|m.m/s^2         |Vertical Transport of Meridional Momentum


 Haoran Xu.




At 2022-05-17 18:30:48, "钱钰坤" <qianyk at mail3.sysu.edu.cn> wrote:
Hi all,


Just a quick question.  Why there is no tendency of vertical momentum,
like TOTWTEND, in the diagnostics even the non-hydrostatic option is
turned on?


To close the energy budget, I guess we need this diagnostic.  Is there any
workaround to obtain it if there is no TOTWTEND?




 Best regards.
 
---------------------------
Yu-Kun Qian (钱钰坤)
South China Sea Institute of Oceanology

Sun Yat-sen University 
Xingang West Road, Haizhu District 
Guangzhou, P.R. China
Email: qianyk at mail3.sysu.edu.cn      


 




 




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