[MITgcm-devel] MOC and forcing fields

[Patrick Heimbach]

Dimitris,

On Sep 21, 2007, at 8:50 AM, Dimitris Menemenlis wrote:

> Martin, a naive question: the MOC slows down relative to what?  How  
> does one know what the actual MOC should look like?

Just to provide some context for Martin's mail,
Armin has run the 1 deg. LLC setup for 50 years (NCEP/NCAR period)
and noticed erosion of transports.
Judging from other projects this seems a generic problem for
truly global setups running over longer periods,
or at least it seems rxtrapolating from Martin's info.

> Is that relative to the Ganachaud and Wunsch estimates?  Are there  
> any other data-based estimates available?

Dimitris, what a heretic question!
Of course there are other data-based estimates.
Check e.g. http://www.ecco-group.org
;o)

-p.



> I am also still waiting for instructions from you regarding latest  
> ice dynamics solver changes.  What tests do I need to repeat and  
> what tests are OK?  D.
>
> Dimitris Menemenlis
> cell: 818-625-6498
>
> -----Original Message-----
>
> From:  Martin Losch <Martin.Losch at awi.de>
> Subj:  [MITgcm-devel] MOC and forcing fields
> Date:  Fri Sep 21, 2007 12:11 am
> Size:  1K
> To:  MITgcm-devel at mitgcm.org
>
> FYI,
>
> I have noticed that with the CORE climatoloty and the 2deg llc grid
> the Atlantic MOC slows down considerably to
> I have heard from other modellling groups that they had the same
> experience (Arne Biastoch in Kiel, Adrian New in Southampton, both
> with OPA/NEMO and at different resolutions). I asked Adrian, and he
> pointed me to the DRAKKAR project in France. The two documents
> describe this problem and the document how they modified the forcing
> fields (starting from CORE) to alleviate this problem. They have come
> up with something called DSF3 (Drakkar forcing set number 3):
>
> Drakkar Project report, Section 4.1.3 on atmospheric forcing
> http://www.ifremer.fr/lpo/treguier/drakkar/reports/2006/Drakkar-
> CRA2006-Final.pdf
>
> technical report, section 3.2
> http://www.ifremer.fr/lpo/treguier/drakkar/configs/ORCA025/
> orca025_G70.pdf
>
> As far as I know the Kiel-group handles this problem by massive
> restoring in the Arctic.
>
> Martin
>
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---
Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
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