My air temperature is not the same as your air temperature if my air
temperature is a monthly mean and yours is an instantaneous value :-)
So we're used to going beyond *just* the standard name.
I think it is important however to make sure the mars'acious-ness of the
data clear somehow, but I'm just about in Jonathan's camp. I don't think
you should end up including the mars data in your search anyway, and are
likely to reject it before you get to downloading the data itself ....
At least at our place if you *start* with a search on air temperature
you'll get discovery metadata back - enough to reject (or select) Mars
data ...
Cheers
Bryan
> This raises a broader question about CF, perhaps thinking too far
> ahead.
>
> Per my understanding, the terms in CF are chosen to maximize the
> interoperability of data sets that use them. The idea is that I can
> expect my sea_water_temperature or air_temperature to be pretty much
> the same as yours.
>
> What is the mechanism by which the grand poobah of data set
> searching, or anyone else, can tell that the air_temperature of the
> BADC climate model is of the Martian atmosphere, not the Earth one?
> My assumption has always been that the terms are describing _this
> planet's_ observables.
>
> Presumably casual inspection will be likely to make obvious the
> distinction in many/most (all?) cases, so is that sufficient? Or do
> we want the computer that finds a model with air_temperature to be
> able to understand which planet's air is being referred to, just
> from the variable name?
>
> John
>
> On Jan 25, 2011, at 06:49, <alison.pamment at stfc.ac.uk>
<alison.pamment at stfc.ac.uk> wrote:
> > Dear All,
> >
> > At BADC we are preparing to archive some data generated by a group
> > at Oxford University who are working on a climate model of the
> > Martian atmosphere. The data will be archived as CF-compliant
> > netCDF files. Many of the model variables are the same as those
> > used in earth simulations, e.g., air temperature, u and v wind
> > components, surface atmospheric pressure, and for all these we
> > will use existing standard names. However, there are a small
> > number of variables for which there are no existing standard
> > names. Therefore, we would like to propose the following new
> > names:
> >
> > carbon_dioxide_ice_amount; kg m-2
> > This is the mass per unit area of frozen carbon dioxide on the
> > Martian surface.
> >
> > atmosphere_optical_thickness_due_to_dust_dry_aerosol; 1
> > This follows the pattern of the existing name
> > atmosphere_optical_thickness_due_to_dust_ambient_aerosol and is
> > defined in an analogous way.
> >
> > aerocentric_longitude; degree
> > 'Aerocentric longitude' is a widely used term within the Mars
> > modelling community and indicates the season within the Martian
> > year according to the sun's apparent motion relative to the
> > planet's equator. Zero degrees is defined as the northern
> > hemisphere vernal equinox, i.e., the ascending node of the
> > apparent seasonal motion of the Sun on the planet's equator
> > [http://www.giss.nasa.gov/tools/mars24/help/notes.html]. Thus 90,
> > 180 and 270 degrees indicate, respectively, the summer solstice,
> > autumnal equinox and winter solstice.
> >
> > We would welcome comments on these proposals.
> >
> > Best wishes,
> > Alison
> >
> > ------
> > Alison Pamment Tel: +44 1235 778065
> > NCAS/British Atmospheric Data Centre Fax: +44 1235 446314
> > STFC Rutherford Appleton Laboratory Email:
> > alison.pamment at stfc.ac.uk R25, 2.22
> > Harwell Oxford, Didcot, OX11 0QX, U.K.
>
> John Graybeal <mailto:jgraybeal at ucsd.edu>
> phone: 858-534-2162
> System Development Manager
> Ocean Observatories Initiative Cyberinfrastructure Project:
> http://ci.oceanobservatories.org Marine Metadata Interoperability
> Project: http://marinemetadata.org
>
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
--
Bryan Lawrence
Director of Environmental Archival and Associated Research
(NCAS/British Atmospheric Data Centre and NCEO/NERC NEODC)
STFC, Rutherford Appleton Laboratory
Phone +44 1235 445012; Fax ... 5848;
Web: home.badc.rl.ac.uk/lawrence
Received on Mon Jan 31 2011 - 02:26:00 GMT
