All,
Only trivial thing: "aerocentric_longitude" should be
"areocentric_longitude" ("RE" instead of "ER").
I think it's the first time to use the word "longitude" to represent a
coordinate in space, like in ecliptic longitude or galactic longitude. I'm
not inventing other wording, so my suggestion is to modify the description:
"Longitude is positive eastward; its units of degree_east (or equivalent)
indicate this explicitly. In a latitude-longitude system defined with
respect to a rotated North Pole, the standard name of grid_longitude should
be used instead of longitude. Grid longitude is positive in the
grid-eastward direction, but its units should be plain degree."
Best Regards,
--
Eizi TOYODA
http://www.google.com/profiles/toyoda.eizi
----- Original Message -----
From: <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Tuesday, January 25, 2011 11:49 PM
Subject: [CF-metadata] Standard names for Martian climate model data
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: [email protected]
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
--
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