[RegCNET] Slab ocean model

[Solmon Fabien]

Dear Michael et al.

The slaboc option is quite straightforward to use .

1) Build a climatology of q-fluxes ( compensating for the deviation of
the SST calculated using a simple mixed layer energy budget , and the
observations you force normally the model with e.g  OISST) :
you do a first simulation using

islab_ocean=1
in physicsparam
and
&slabocparam
 do_restore_sst = .true.
 do_qflux_adj = .false.

This will produce a monthly q-flux file in your _input_ directory call
domname_SOM.YYYYMMDDHH.nc. You need at least to run one year to have a
complete annual cycle, but it is advised to run for several year to
build a proper climatology. In this run the slaboc SST are restored to
observations , so it should be close to run with purely forces SST. If
you check it you should see normally the bigger value of q-fluxes ( +or
-)where the slab-ocean prognostic SST are diverging strongly from
reality, i.e. where the ocean dynamic plays a lot in determining SST 's,
e.g upwelling regions.

Then you can proceed to "adjusted runs"  runs where you will use the SST
calculated from the slab ocean energy budget accounting fro the
corrective energy fluxes saved in phase one ( the q flux basically
drives the seasonal cycle insuring your SST stays realistic, while
allowing shorter time intearctions with the atmosphere) ..

islab_ocean=1
in physicsparam
and
&slabocparam
 do_restore_sst = .false.
 do_qflux_adj = .true.
 
Typically you run a control "adjusted" run, and then some experiment
"adjusted" runs  where you modify e.g. landuse, aerosol, convection
schemes, etc .

Overall this is simple to operate ,the inconvenient is that you need to
perform one more run to produces a reference q-flux climatology ..it has
also been tested mostly over the Indian domain .
 

Good to know, there are some parameters that might be sensitive ( but
never really tested ) in the slaboc . e.g. the time scale for restoring
( fixed to five days ) , or the depth of the mixed layer ( fixed to 50m)
. We have a monthly climatology of global mixed layer depth that would
be good to use, but never had time to integrate this ...


Fabien





On 11/11/15 16:40, Michael Notaro wrote:
>
> Is there any documentation on how to run RegCM4 with the slab ocean
> model option?
>
> I found minimal discussion in the gforge documents (e.g. user's
> guide) and a brief discussion in the following article.
>
> http://www.atmos-chem-phys.net/15/8051/2015/acp-15-8051-2015.pdf
> Is the RegCM4-slab ocean model running without any issues and is it
> straightforward to use?
>
> Thanks, Michael
>
>
>
> Michael Notaro
> Associate Director
> Nelson Institute Center for Climatic Research
> University of Wisconsin-Madison
> Phone: (608) 261-1503
> Email: mnotaro at wisc.edu
>
>
> _______________________________________________
> RegCNET mailing list
> RegCNET at lists.ictp.it
> https://lists.ictp.it/mailman/listinfo/regcnet


-- 
---------------------------------------------------
Fabien Solmon
Research Scientist
+39 040 2240206 (office) | Earth System Physics  
+39 040 2240449 (fax)    | ICTP (UNESCO-IAEA)  
esp.ictp.it              | Strada Costiera 11  
                         | 34014 Trieste, Italy

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ictp.it/pipermail/regcnet/attachments/20151113/f5861c78/attachment-0001.html>