[MITgcm-support] questions

[Riema Rachmayani]

hi all..

Is MITGCM using sigma coordinate?? how to treat if there is slope for vertical grid without sigma coordinate??

what the different between T.init and tref in internal_wave verification??

thx
rima

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To: mitgcm-support at mitgcm.org
Sent: Friday, October 27, 2006 11:00:06 PM
Subject: MITgcm-support Digest, Vol 40, Issue 16

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Today's Topics:

   1. KPP and KPP_ghatUseTotalDiffus (David Ferreira)
   2. Re: KPP and KPP_ghatUseTotalDiffus (Martin Losch)


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

Message: 1
Date: Thu, 26 Oct 2006 20:40:08 -0400
From: David Ferreira <dfer at ocean.mit.edu>
Subject: [MITgcm-support] KPP and KPP_ghatUseTotalDiffus
To: mitgcm-support <mitgcm-support at mitgcm.org>
Message-ID: <45415568.9000800 at ocean.mit.edu>
Content-Type: text/plain; charset=us-ascii; format=flowed

Hi,

I just run into the "KPP_ghatUseTotalDiffus" flag in KPP.
It seems to be adding some contribution coming from
GM Redi to the KPP diffusivity, but it's not quite to clear to me.

Could someone explain me what this flag exactly does
and what's the reason for it ?
Thanks,
david



-- 

Ferreira David               Tel : 617 253 7967 
EAPS Room 54-1515,
Massachusetts Institute of Technology,
77 Massachusetts Avenue
Cambridge, MA, 02139



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

Message: 2
Date: Fri, 27 Oct 2006 08:38:26 +0200
From: Martin Losch <mlosch at awi-bremerhaven.de>
Subject: Re: [MITgcm-support] KPP and KPP_ghatUseTotalDiffus
To: mitgcm-support at mitgcm.org
Message-ID: <BA52AD18-38D9-4876-BB03-C92FDADC5F42 at awi-bremerhaven.de>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hi David,
as far as I can see, the flag is used in kpp_transport_t/s/ptr where  
the counter-gradient flux (or non-local term) of KPP is applied (the  
second term in the following expression):
kappa1*dtracer/dz - kappa2*ghat*surfaceFlux

In pure KPP kappa1=kappa2, but GM has a vertical component of kappa  
as well and I guess here you can decide whether this contribution is  
included in kappa2 (it's part of kappa1) as well. I don't know the  
reason/"physics" behind this.

Martin

On 27 Oct 2006, at 02:40, David Ferreira wrote:

> Hi,
>
> I just run into the "KPP_ghatUseTotalDiffus" flag in KPP.
> It seems to be adding some contribution coming from
> GM Redi to the KPP diffusivity, but it's not quite to clear to me.
>
> Could someone explain me what this flag exactly does
> and what's the reason for it ?
> Thanks,
> david
>
>
>
> -- 
>
> Ferreira David               Tel : 617 253 7967 EAPS Room 54-1515,
> Massachusetts Institute of Technology,
> 77 Massachusetts Avenue
> Cambridge, MA, 02139
>
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support



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