Antwort: Re: [CF-metadata] snow temperature

[Karl Taylor]

Burkhardt,

yes, makes sense to me.  I'm sure Jonathan Gregory will weigh in on this 
too.

I just noticed in the description of "surface" you quoted below, it says 
"over sea areas this is taken to be the mean sea level".  This should 
perhaps read "over *ice-free* sea areas this is taken to be the mean sea 
level".

Karl

Burkhardt.Rockel at gkss.de wrote:
> 
> Karl, thank you for the prompt reply.
> 
>  > If you have a
>  > grid-cell (or a larger region) over which you want to characterize a
>  > snow surface temperature, distinct from the temperature of the snow-free
>  >   portion, then we do indeed need a new name.
> 
> exactly that is why I proposed the name.
> I constructed it similar to already existing standard names, for example:
> 
> "surface_snow_thickness_where_sea_ice
> The surface called "surface" means the lower boundary of the atmosphere; 
> over sea areas this is taken to be mean sea level. Unless indicated, a 
> quantity is assumed to apply to the whole area of each horizontal grid 
> box. The qualifier where_/type/ specifies instead that the quantity 
> applies only to the part of the grid box of the named /type/."
> 
> Regards,
> Burkhardt
> 
> 
> Karl Taylor <taylor13 at llnl.gov> schrieb am 27.01.2006 17:58:10:
> 
>  > Dear all,
>  >
>  > Actually, the standard name "surface_temperature" refers, I believe, to
>  > the "skin" temperature at the interface between the atmosphere, and
>  > whatever solid or liquid surface underlies it (i.e., sea ice, ocean,
>  > snow, glacial ice, bare land, vegetated land, etc), so
>  > surface_temperature and surface_temperature_where_snow would be
>  > identical if an entire region were snow covered.  If you have a
>  > grid-cell (or a larger region) over which you want to characterize a
>  > snow surface temperature, distinct from the temperature of the snow-free
>  >   portion, then we do indeed need a new name.
>  >
>  > I note that we define sea_surface_temperature, so that we can
>  > characterize ocean surface temperature distinct from surface temperature
>  > where there is seaice or land.   Actually, I am not absolutely sure
>  > whether sea_surface_temperature should be an average of the surface
>  > temperature of the ocean only in areas where it is in direct contact
>  > with the atmosphere, or if the surface of the ocean under sea ice
>  > (presumably at the freezing point) should also contribute. I would vote
>  > for the first definition.
>  >
>  > regards,
>  > Karl
>  >
>  > Burkhardt.Rockel at gkss.de wrote:
>  > >
>  > > Dear All,
>  > >
>  > > I need to define the surface temperature (i.e. the temperature at the
>  > > interface between snow and atmosphere, this is NOT the bulk snow
>  > > temperature) for the part of the model grid box covered by snow.
>  > > I propose a the following standard name for it:
>  > >
>  > > surface_temperature_where_snow (K)
>  > >
>  > > is this ok?
>  > >
>  > > Regards
>  > > Burkhardt
>  > >
>  > >
>  > >
>  > > 
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