Dear CF community,
In the frame of a collaboration between CNES, EUMETSAT and NOAA we are
working on a way to make Jason-2 netCDF datasets CF compliant, thus we
have new standard names for satellite altimetry to propose you. In
short, an important part of the variables inside the netCDF files are
used to correct the altimetric signal (from geophysical effects among
others), and sometimes are coming from other datasets. It would be
interesting to define some standard name attributes for them, here are
they:
1)
sea_surface_height_correction_due_to_air_pressure_and_wind_at_high_frequ
ency (m)
2) sea_surface_height_correction_due_to_air_pressure
_at_low_frequency (m)
The first attribute stands for high frequency fluctuations of sea
surface topography whereas the second is commonly known as inverted
barometer effect. If "correction" do not fit (I guess correction could
be considered as only representative of the altimetry community point of
view in a sense), maybe something like "difference" or "variation" could
be used instead. What is your opinion on that?
3) backscatter_coefficient
4) sea_surface_height_bias_due_to_sea_surface_roughness (m)
Ocean throughs of waves tend to reflect altimeter pulses better than do
crests; it is commonly known as sea state bias.
5) ionosphere_path_delay (m)
Path delay due to the atmosphere's electron content in
the ionosphere.
6) troposphere_wet_path_delay (m)
Path delay due to liquid water in the troposphere.
7) troposphere_dry_path_delay (m)
Path delay due to dry gases in the troposphere.
8) range (m), or scanned_pulse_distance (m)
An altimeter operates by sending out a short pulse of radiation and
measuring the time required for the pulse to return from the sea
surface; this measurement is called the altimeter range (distance
between instrument and sea surface). My idea was to propose a generic
standard_name (scanned_pulse_distance) for all met-ocean scientists who
are using data based on this measurement principle (ex: LIDAR), what do
you think?
9) altitude_above_reference_ellipsoid (m)
10) sea_surface_height_amplitude_due_to_geocentric_ocean_tide (m)
11) sea_surface_height_amplitude_due_to_earth_tide (m)
12) sea_surface_height_amplitude_due_to_pole_tide (m)
13) sea_surface_height_amplitude_due_to_equilibrium_ocean_tide (m)
14) sea_surface_height_amplitude_due_to_non_equilibrium_ocean_tide (m)
Tides are a significant contributor to the observed sea
surface height, geocentric ocean tide refers to the sum total of ocean
tide and load tide; earth tide refers to solid earth tide; pole tide is
due to variations in the earth's rotation; (non) equilibrium ocean tide
concern long period ocean tide.
15) geoid_height_above_reference_ellipsoid (m)
16) mean_sea_surface_height_above_reference_ellipsoid (m)
17) mean_sea_surface_height_above_geoid (m)
We thank you in advance for all your comments.
Best regards,
Olivier Lauret, on behalf of N.Picot (CNES), J.Lillibridge, K.Casey,
J.Throwe (NOAA), H.Bonekamp, J.Figa (EUMETSAT) and JP.Dumont, P.Sicard
(CLS).
Olivier Lauret
CLS - Space Oceanography Division
Products Dissemination Dpt
8-10 rue Hermes, 31520 Ramonville St.Agne
France
Tel. (+33) (0) 561 39 48 51
Fax:(+33) (0) 561 39 47 80
http://www.cls.fr <
http://www.cls.fr/>
http://www.aviso.oceanobs.com/
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Received on Tue Apr 08 2008 - 08:07:20 BST
