[MITgcm-devel] seaice_get_dynforcing.F: CDAIR SEAICE_drag and OCEAN_drag

[Gael Forget]

Hi Dimitris,

thanks for the clarification. 

If we are to indeed change the SEAICE_drag default, then I would suggest 
rounding it up further to 0.001, since the extra digits (in 0.0011 or 0.00114) 
would give the illusion that we know these parameters with great accuracy
(it does not sound like we do), and because SEAICE_drag = 0.01 
would make the SEAICE_drag / OCEAN_drag equal to 1 exactly.

Gael

On Jan 6, 2014, at 5:36 PM, Menemenlis, Dimitris (3248) wrote:

> Hi Gael, An's adjusted drag coefficient parameters from Table 2 in
> http://ecco2.org/manuscripts/2011/NguyenJGR2011.pdf
> and also from
> http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/arctic/cs_18km/input/data.seaice
> are:
> 
>      SEAICE_waterDrag   = 5.5627,
>      SEAICE_drag        = 0.00114,
> 
> instead of default values:
> 
>      SEAICE_waterDrag   = 5.5    _d 0
>      SEAICE_drag        = 0.002  _d 0
> 
> So your recollection is correct.
> I would leave SEAICE_waterDrag alone, both because the change is small
> and because it is the default AOMIP value.  But we could change the default
> SEAICE_drag to 0.0011 or 0.00114, since it would be more in line with
> the AOMIP range of values between .0011 and .0013.
> 
> Dimitris Menemenlis
> 
> On Jan 6, 2014, at 11:43 AM, Gael Forget wrote:
> 
>> Two related questions :
>> - Are the default pkg/seaice drag parameters "correct" for simulations forced by 
>> wind vectors as opposed to wind stress? I think I recall An arguing that the default 
>> SEAICE_drag could be in error by a factor of 2 in this case (but maybe I recall wrong).
>> - In general, has anyone done a careful comparison of wind stress results from 
>> exf versus seaice? I understand that interpretation of the differences could be 
>> tricky but maybe such a comparison would still be informative.
> 
> 
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