[MITgcm-support] "gad_diff_r.F" and mixing

[Matt Palmer]

Thanks Chris.

That makes sense to me. Presumably when using horizontal and vertical 
mixing, "gad_diff_r.F" would be called?

Matt

Chris Hill wrote:

>Hi matt,
>
> in the situation you describe gad_diff_r is not used or needed. With gm
>active the vertical k can become large because it includes a project of the
>along iso surface horizontal diffusivity and bolus transport. Therefore in
>the mode where gm is active implicit vertical diffususion should/is always
>be used.
>
> Does that make sense?
>
>chris 
>
>  
>
>>-----Original Message-----
>>From: mitgcm-support-bounces at mitgcm.org 
>>[mailto:mitgcm-support-bounces at mitgcm.org] On Behalf Of Matt Palmer
>>Sent: Tuesday, August 03, 2004 12:17 PM
>>To: mitgcm-support at mitgcm.org
>>Subject: [MITgcm-support] "gad_diff_r.F" and mixing
>>
>>Hi there.
>>
>>I've been doing model runs using the GMRedi package and 
>>combining a 3-D vertical mixing field. When I compare the 
>>model overturning (the Indian
>>Ocean) using GMRedi and vertical mixing, the result is much smaller (2
>>Sv) than for the same vertical mixing field and 
>>horizontal/vertical mixing (16 Sv).
>>
>>While looking into this discrepency I found that 
>>"gad_diff_r.F" was not being called from "gad_calc_rhs.F". It 
>>seems that if "gad_diff_r.F" is not called, it's because the 
>>model is using implicit diffusion. Can someone tell me 
>>whether "gad_diff_r.F" should be routinely called when using 
>>vertical mixing?
>>
>>Many thanks,
>>
>>Matt Palmer
>>
>>
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>>    
>>
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