[MITgcm-support] [SPAM] Re: FW: Diagnose momentum equation

[lianzhan at fio.org.cn]

Hi Jean-Michel:

Thank you so much for your help!

The attachements are "data" and "dada.pkg" files of my exp. 

About U/Vm_dPHdx, I think you are right. But in this exp, I have used Non-linear free-surface and apply free surface effect to column total thickness (implicSurfPress = 0.5 & nonlinFreeSurf=4 ...). So how could I output the pressure anomaly horizontal gradient caused by the fluctuation on sea surface?

I am still trying to figure out what happen with U/Vm_Cor and U/Vm_Advec. Does "U/Vm_Advec" respresent the "UdU/dx+VdU/dy+WdU/dz" term in momentum equation? What is the different between "U/Vm_Advec" and "U/Vm_AdvZ3"?

Thanks again!

Cheers

Lianzhan

 
From: Jean-Michel Campin
Date: 2015-09-26 23:19
To: mitgcm-support
Subject: [SPAM] Re: [MITgcm-support] FW: Diagnose momentum equation
Hi Lianzhan,
 
It's likely that if Temp & Salt remains uniform, U/Vm_dPHdx will be zero
(no hydrostatic pressure anomaly horizontal gradient).
Not very clear why U/Vm_Cori would be zero everywhere except for surface level,
unless the velocity (uVel,vVel) is also zero everywhere below k=1.
 
What type of forcing do you have in this set-up ?
 
If you could send (in attachement) the 2 parameter files "data" and
"data.pkg", this would help to figure out what is happening.
 
Cheers,
Jean-Michel
 
On Sat, Sep 26, 2015 at 01:27:27PM +0000, lianzhan wrote:
> Hello everyone
> 
> I want to diagnose the effect of all items in momentum equation (as below for zonal).
> dU/dt+UdU/dx+VdU/dy+WdU/dz=fv-1/rho*dP/dx+Fx+taux/rho
> Fx is dissipative stress, taux is wind stress. Is there any corresponding variable in pkg/diagnostics ? I have tried "U/Vm_Advec" for nonlinear term, but this variable is zero expect for the surface layer. Its value is as same as "U/Vm_Cori", the value of "U/Vm_Cori" is also zero below surface. And "U/Vm_dPHdx"(pressure gradient force ? ) is all zero.
> The settings of my exp is that there is an island located in an ideal rectangular bay,  near which there is a sill. The model has 32 vertical layers and with free surface. The Temp/Salt is uniform. 
> Do you have any recommendations or suggestions?
> Thanks in advance for your helpCheers,Lianzhan
> 
> 
> xiaober at outlook.com
> 
>             
 
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