Hi Roy and Steve. Your modified names will work fine. I would prefer
units of "ppm" and "ppb" as they match our historical naming. I'm very new
to the CF Conventions, please bear with me. Here is the modified request
for new fields:
name: volume_mixing_ratio_of_water_vapor_in_air
description: The atmospheric water vapor mixing ratio in parts per million
by volume.
units: ppm
name: volume_mixing_ratio_of_ozone_in_air
description: The atmospheric ozone mixing ratio in parts per billion by
volume.
units: ppb
I'll be sure to include the units as attributes of each variable.
Thanks.
- Allen
On Tue, Feb 28, 2017 at 2:40 AM, Lowry, Roy K. <rkl at bodc.ac.uk> wrote:
>
> Hi Steve,
>
>
> I think there is a CF precedent would pacify you a little here, which is
> to have Standard Names of the form 'volume_mixing_ratio' with canonical
> units of dimensionless such as volume_mixing_ratio_of_oxygen_at_stp_in_sea_water.
> I would suggest following this practice in this case with:
>
>
> volume_mixing_ratio_of_water_vapor_in_air
>
> volume_mixing_ratio_of_ozone_in_air
>
>
> A note to Allen is that your actual units including scaling factor are
> explicity included in CF NetCDF as a parameter attribute.
>
>
> Cheers, Roy.
>
> Please note that I partially retired on 01/11/2015. I am now only working
> 7.5 hours a week and can only guarantee e-mail response on Wednesdays, my
> day in the office. All vocabulary queries should be sent to
> enquiries at bodc.ac.uk. Please also use this e-mail if your requirement is
> urgent.
>
>
> ------------------------------
> *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Steve
> Emmerson <emmerson at ucar.edu>
> *Sent:* 27 February 2017 22:04
> *To:* Allen Jordan - NOAA Affiliate
> *Cc:* CF Metadata Mail List
> *Subject:* Re: [CF-metadata] new standard names request
>
> BEGIN RANT
>
> This is the kind of stuff that I don't like: putting additional (and
> unnecessary) semantics into the unit specification. "ppm" is bad enough
> (1e-6 would be better) but *volume*!
>
> The attributes of a physical quantity are attributes of the quantity
> itself -- *not* its unit. If a physical quantity is atmospheric mixing
> ratio by volume, then name it as such and leave the unit alone. The
> alternative is to pollute the unit namespace with "volume", "mass",
> "carbon", and whatever else people think up -- leading to a unending
> additions to the units database.
>
> Call the quantity "atmospheric water vapor mixing ratio by volume" and
> specify the unit as "1e-6" (or "ppm" if you must).
>
> Lest you think I'm alone in this, see sections 7.4 and 7.5 of <
> https://www.nist.gov/pml/nist-guide-si-chapter-7-rules-
> and-style-conventions-expressing-values-quantities>.
>
> <https://www.nist.gov/pml/nist-guide-si-chapter-7-rules-and-style-conventions-expressing-values-quantities>
> NIST Guide to the SI, Chapter 7: Rules and Style ...
> <https://www.nist.gov/pml/nist-guide-si-chapter-7-rules-and-style-conventions-expressing-values-quantities>
> www.nist.gov
> 7.1 Value and numerical value of a quantity The value of a quantity is its
> magnitude expressed as the product of a number and a unit, and the number
> multiplying the ...
>
>
> END RANT
>
> Thanks for letting me get this off my chest. :-)
>
> Regards,
> Steve Emmerson
>
> On Mon, Feb 27, 2017 at 2:21 PM, Allen Jordan - NOAA Affiliate <
> allen.jordan at noaa.gov> wrote:
>
>> I would like to add two standard names for the NOAA GMD OZWV group's
>> weather balloon data:
>>
>> name: water_vapor_mixing_ratio
>> description: The atmospheric water vapor mixing ratio in parts per
>> million by volume.
>> units: ppmv
>>
>> name: ozone_mixing_ratio
>> description: The atmospheric ozone mixing ratio in parts per billion by
>> volume.
>> units: ppbv
>>
>>
>> _______________________________________________
>> CF-metadata mailing list
>> CF-metadata at cgd.ucar.edu
>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>>
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