[CF-metadata] additional standard name for ISMIP6
alison.pamment at stfc.ac.uk
alison.pamment at stfc.ac.uk
Thu Feb 9 07:53:03 MST 2017
Many thanks for the quick reply. The following standard name is now accepted for publication and will be added to the table at the next update:
grounded_ice_sheet_area (Canonical units: m2)
' "X_area" means the horizontal area occupied by X within the grid cell. The extent of an individual grid cell is defined by the horizontal coordinates and any associated coordinate bounds or by a string valued auxiliary coordinate variable with a standard name of "region". "Grounded ice sheet" indicates where the ice sheet rests over bedrock and is thus grounded. It excludes ice-caps, glaciers and floating ice shelves.'
I will also update the existing X_area names to add the sentence about grid cell extent to their definitions. This affects the following four names: burned_area; fire_area; sea_area; sea_ice_area.
> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of
> Jonathan Gregory
> Sent: 09 February 2017 14:28
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] additional standard name for ISMIP6
> Dear Alison
> > Jonathan replied:
> > > Are you sure we can't call it area? It seems to me it's fine to call it that
> > > if the coordinates indicate it refers to the whole world (regarded as one
> > > grid cell) or to some large region (containing an entire ice sheet).
> > I certainly agree that it seems more natural to call it
> grounded_ice_sheet_area. The definitions of the four existing "X_area" names
> say '"X_area" means the horizontal area occupied by X within the grid cell'.
> When I made my previous comments I was thinking about summing areas
> across multiple grid cells each of which contains a part of the ice sheet, but
> actually if the 'grid cell' in this case covers the entire area of the ice then it's
> not a problem. Perhaps the definition should be modified to emphasize that a
> bit more. Maybe something like:
> > ' "X_area" means the horizontal area occupied by X within the grid cell. The
> extent of an individual grid cell is defined by the horizontal coordinates and any
> associated coordinate bounds or by a string valued auxiliary coordinate variable
> with a standard name of "region".' Does that sound OK?
> Yes, I think that would be fine for this and other area-integral quantities
> like it. It seems fine to allow "grid cell" to mean any region which can be
> defined by horizontal coord bounds.
> > You're right, it should be floating_ice_shelf_area_fraction to be consistent
> with the new area type of floating_ice_shelf that we have just introduced for
> ISMIP6. I think the terminology changed part way through the conversation and I
> neglected to update the standard name. I will create an alias
> (floating_ice_sheet_area_fraction -> floating_ice_shelf_area_fraction) and
> modify the definition accordingly. This will be included in the next update of
> standard names, planned for 21st February.
> Thanks very much
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Alison Pamment Tel: +44 1235 778065
Centre for Environmental Data Analysis Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
Harwell Campus, Didcot, OX11 0QX, U.K.
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