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ROMS/TOMS

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PostPosted: Thu Oct 04, 2018 7:26 pm 
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Joined: Fri Sep 20, 2013 1:09 pm
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Location: India
Hi all,

Could someone tell me what would happen if LMD_BKPP module is undefined while using other modules of LMD scheme?

Also, I would be grateful if you could tell me where can read about all LMD modules.

LMD_SKPP
LMD_BKPP
LMD_RIMIX
LMD_CONVEC
LMD_DDMIX
LMD_NONLOCAL

Thanks in adavance, Jayasankar


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PostPosted: Thu Oct 04, 2018 7:52 pm 
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Joined: Wed Dec 31, 2003 6:16 pm
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Location: USGS, USA
here is a place to start:
https://www.myroms.org/wiki/Vertical_Mi ... erizations
suggest you also dig into the code a bit. you can grep for those options and they are mostly in Nonlinear/lmd_...

-j


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PostPosted: Thu Oct 04, 2018 8:26 pm 
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Joined: Fri Sep 20, 2013 1:09 pm
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Hi jc,

Thanks for the reply.I have gone through the link that has been given, however, it doesn't address each module separately nor it mentions a bottom boundary layer. I specifically would like to know what would happen if LMD_BKPP is undefined. Could you help.

Thanks a lot. jay


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PostPosted: Thu Oct 04, 2018 8:44 pm 
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Location: USGS, USA
Here is another paper that i remembered-
https://marine.rutgers.edu/po/Papers/Durski_JGR04.pdf
See what Scott did in that paper. I think he undefined the bottom bbl.

The code looks to me like lmd_bkpp computes the eddy diffusivity and viscosity, and will replace those values where
"! Compute boundary layer mixing coefficients, combine them
! with interior mixing coefficients. Take the maximum estimate
! of vertical mixing only where the surface and bottom boundary
! layers overlap. (Do not let the interior overwrite the boundary
! layer estimate)."

So if you dont have bkpp on, then this bottom part would not get computed and the AKV and AKT would extend to the bottom but only based on interior information, not any bottom processes. That is my take on it, but i dont use this mixing scheme.

-john


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PostPosted: Thu Oct 04, 2018 8:47 pm 
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Joined: Wed Jul 02, 2003 5:29 pm
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Location: IMS/UAF, USA
The original KPP has only a surface boundary layer. Scott Durski took the surface BBL and flipped it to add a bottom BBL. Without the bottom one, it is more like pure Large et al.


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PostPosted: Thu Oct 04, 2018 9:00 pm 
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Joined: Fri Sep 20, 2013 1:09 pm
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Thank you john.
I think the paper would help :D .


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