Dear Matthias,
I've had a quick look back at this discussion. The name and units are fine:
acoustic_signal_roundtrip_travel_time_in_sea_water (s).
I see that there was some discussion of additional metadata that should be provided in addition to the standard name itself, but no definition text was really decided. It seems to me that the name itself is quite generic, although in your particular application it is being used for roundtrip times between the sea floor and the sea surface. Therefore, I am suggesting the following definition, based on the mailing list discussion:
'The quantity with standard name acoustic_signal_roundtrip_travel_time_in_sea_water is the time taken for an acoustic signal to propagate from the emitting instrument to a reflecting surface and back again to the instrument. In the case of an instrument based on the sea floor and measuring the roundtrip time to the sea surface, the data are commonly used as a measure of ocean heat content.'
Does that sound OK? If we can agree a definition then the name can be accepted and included in the next standard name table update.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
Centre for Environmental Data Analysis Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf
> Of Matthias Lankhorst
> Sent: 12 October 2015 19:44
> To: cf-metadata at cgd.ucar.edu
> Subject: [CF-metadata] looking to finalize standard name
> acoustic_signal_roundtrip_travel_time_in_sea_water
>
> Hi,
>
> in 2013, I started a brief discussion about a new standard name for
> inverted echo sounder data, see e-mail thread below.
>
> The proposed name would be:
> acoustic_signal_roundtrip_travel_time_in_sea_water
>
> It is duly listed on the CF website about standard names that are
> pending. Any chance this could be approved now? I do not recall any
> objections, but I am wondering why this is taking so long. Do I need to
> do anything else to get this approved speedily?
>
> Matthias
>
>
>
>
> [CF-metadata] standard_name for acoustic travel time from echo sounder
> Lowry, Roy K. rkl at bodc.ac.uk
> Thu May 30 07:45:54 MDT 2013
>
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> travel time from echo sounder
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>
> ___________________________________________________________________
> _____
> Dear All,
>
> Of Matthias's suggestions I have a strong preference for a slight
> extension of roundtrip_acoustic_travel_time_in_sea_water, namely
> acoustic_signal_roundtrip_travel_time_in_sea_water. 'two-way' is a
> possible alternative to 'roundtrip' but I think the former carries
> unfortunate seismic semantic implications, so 'roundtrip' is better for
> IES. Including 'in_sea_water' is also essential to clearly distinguish
> it from seismic data.
>
> Cheers, Roy.
>
>
>
> ________________________________________
> From: CF-metadata [cf-metadata-bounces at cgd.ucar.edu] On Behalf Of
> Matthias Lankhorst [mlankhorst at ucsd.edu]
> Sent: 30 May 2013 13:16
> To: cf-metadata at cgd.ucar.edu
> Subject: [CF-metadata] standard_name for acoustic travel time from echo
> sounder
>
> Dear CF,
>
> I have oceanographic data from IES instruments (inverted echo sounder)
> that I
> would like to publish via OceanSITES in a CF-compliant form. The data in
> question are acoustic travel times from the echo sounding device. This
> means
> the time it took for the acoustic signal to run from the instrument (which
> sits on the seafloor) to the sea surface and back to the instrument. These
> data are commonly used as a proxy for ocean heat content.
>
> I don't think there is a suitable CF standard_name out there, and ask for your
> help in finding/creating one. Which of the following sound good?
>
> acoustic_travel_time
> vertical_acoustic_travel_time
> roundtrip_acoustic_travel_time_in_sea_water
> echo_sounder_acoustic_travel_time
>
> ...I could think of a couple more combinations using the words above, but
> would like to hear other people's opinions.
>
> The canonical units would obviously be seconds.
>
> I assume the data would need some additional description to denote the
> vertical extent of the measurement, such as cell_bounds and
> cell_methods='Z:sum'.
>
> Any comments?
>
> Kind regards, Matthias
>
>
>
> --
> _______________________________________
>
> Dr. Matthias Lankhorst
> Scripps Institution of Oceanography
> 9500 Gilman Drive, Mail Code 0230
> La Jolla, CA 92093-0230
> USA
>
> Phone: +1 858 822 5013
> Fax: +1 858 534 9820
> E-Mail: mlankhorst at ucsd.edu
> http://www-pord.ucsd.edu/~mlankhorst/
>
>
>
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Received on Tue Oct 13 2015 - 05:17:09 BST
