Hi all -
In the interest of getting a reply to Ajay, are we going to recommend
the new
standard name
difference_of_oxygen_per_unit_mass_in_sea_water_from_saturation,
as suggested by Jonathan? I suppose we can recommend that the BGC folks use
their domain's preferred term, Apparent Oxygen Utilization, as a long name.
I'll just make one last-ditch effort, by quoting Roy's email of 1/20/15,
then I'll
stop being disagreeable:
Wally Broecker's work is so well absorbed into biogeochemistry that we should
respect his terminology.
Cheers -
Nan
On 1/26/15 12:35 PM, Jonathan Gregory wrote:
Dear Nan
Yes, there are standard_names which are not self-explanatory, I agree. But I
think that in the standard_name table the advantage of being self-explanatory
outweighs the disadvantage of being longer and less familiar. The standard_name
table has a particular purpose of helping to describe quantities so that people
with different sources of data can work out if their quantities are "the same
thing" for the purpose of intercomparison. That's why we may use different and
more explicit terms from the ones that experts in various domains use among
themselves.
Yours equally respectfully
Jonathan
----- Forwarded message from Nan Galbraith<ngalbra...@whoi.edu> -----
Date: Mon, 26 Jan 2015 09:20:54 -0500
From: Nan Galbraith<ngalbra...@whoi.edu>
To:cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] Fwd: Re: Request for new standard-name:
apparent_oxygen_utilization
The terms that have been suggested (like
difference_of_oxygen_per_unit_mass_
in_sea_water_from_saturation) are more descriptive of the method of
measurement
and calculation than of the concept being described, apparent oxygen
utilization,
so I have to respectfully disagree.
I think there are precedents for allowing a concept like 'apparent
oxygen utilization'
to be used as a standard name, in preference to describing measurement and
calculation methods in these terms.
Some examples are richardson_number_in_sea_water,
atmosphere_dry_energy_content,
atmosphere_convective_inhibition_wrt_surface - these all describe
the calculations in
their definitions, not in the names themselves.
Regards -
Nan
On 1/21/15 1:46 PM, Jonathan Gregory wrote:
Dear Nan
Sorry to be awkward, but it doesn't change my opinion. CF standard names are
often not the terms which are customarily used in the expert communities
themselves. They're not really names, but explanations, in many cases. This
is in no way to underrate the expertise of the people concerned, but to make
things clear. For example, in atmospheric science, there is a quantity which
most people would recognise by the name of omega. But that's not at all self-
explanatory and the same letter is used in other fields for different things,
so its standard name is lagrangian_tendency_of_air_pressure, which answers
the question, "What is omega?", rather than being the customary jargon term.
Best wishes
Jonathan
----- Forwarded message from Nan Galbraith<ngalbra...@whoi.edu> -----
Date: Tue, 20 Jan 2015 13:35:36 -0500
From: Nan Galbraith<ngalbra...@whoi.edu>
To:cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] Fwd: Re: Request for new standard-name:
apparent_oxygen_utilization
Hi all -
I received this follow-up from Ajay, and thought it would be OK
to share it with the list. I wasn't aware of it, but 'apparent oxygen
utilization' seems to be a well-defined term in oceanography.
Not sure if this changes others' opinions, but it does change mine.
Regards -
Nan
-------- Original Message --------
Subject: Re: [CF-metadata] Request for new standard-name:
apparent_oxygen_utilization
Date: Thu, 15 Jan 2015 15:24:25 -0500
From: Ajay Krishnan - NOAA Affiliate<ajay.krish...@noaa.gov>
To: Nan Galbraith<ngalbra...@whoi.edu>
Hi Nan,
I posed your question to the Science team that requested the
standard name and this was their response:
Maybe it is better to stick to a citable reference. No additional
description of what AOU is necessary, in my opinion. But if one is
needed, I can slightly modify Tim's version
AOU, Apparent Oxygen Utilization, is defined as the difference
between the saturation oxygen concentration at 1 atmosphere and the
observed oxygen concentration (Broecker and Peng, 1982)
Broecker, W. S. and T. H. Peng (1982), Tracers in the Sea,
Lamont-Doherty Earth Observatory, Palisades, N. Y.
---------- Forwarded message ----------
Date: Thu, 15 Jan 2015 13:21:57 -0500 (EST)
From: Tim Boyer <tim.bo...@noaa.gov <mailto:tim.bo...@noaa.gov>>
To: Ajay Krishnan - NOAA Affiliate <ajay.krish...@noaa.gov
<mailto:ajay.krish...@noaa.gov>>
Subject: Re: Fwd: [CF-metadata] Request for new standard-name:
apparent_oxygen_utilization
Ajay,
...
AOU is a standard calculation made by oceanographers to
estimate non-physical usage of oxygen - non-physical
meaning biological uptake/release and chemical reaction.
Physically, it is assumed that oxygen will be saturated
at the surface with respects to the atmosphere through physical
processes and therefore only non-physical processes can alter oxygen
content from saturation state. If Nan (or Hernan) would like to
suggest a change or addition to the definition, thats
fine.
As for whether AOU should be defined somewhere else,
cell method or standard name modifier - that is something
for you CF experts to decide. Please ask Nan to propose
such a definition.
Thanks,
Tim
On Thu, Jan 15, 2015 at 9:30 AM, Nan Galbraith <ngalbra...@whoi.edu
<mailto:ngalbra...@whoi.edu>> wrote:
Hi, Ajay -
This looks, at first glance, like a too-specific term; the
definition doesn't
carry as much information as the proposed standard name itself. What I
mean, specifically is, aren't there times when the difference
between saturation
oxygen and observed oxygen are NOT a measure of oxygen utilization?
And, isn't there an existing method to describe a value that
represents a
difference such as this? Standard name modifier, or cell method,
I'm not
sure which ... sorry I can't look more closely at this right now!
Regards - Nan
On 1/14/15 11:54 AM, Ajay Krishnan - NOAA Affiliate wrote:
Hi All,
I had requested for a new standard name for
apparent_oxygen_utilization during the last week of November.
Since, there have been no discussions on it, I wanted to quickly
follow up on it.
Thanks,
Ajay
On Mon, Nov 24, 2014 at 2:16 PM, Ajay Krishnan - NOAA Affiliate
<ajay.krish...@noaa.gov <mailto:ajay.krish...@noaa.gov>> wrote:
Dear CF community,
On behalf of NODC, I would like to request for a new standard
name:
apparent_oxygen_utiliziation (AOU)
definition: the difference between saturation oxygen content
and observed oxygen content.
units: micromoles/kg
Description is from Broecker and Peng, 1982, Tracers in
the Sea
http://www.ldeo.columbia.edu/~broecker/Home_files/TracersInTheSea_searchable.pdf
<http://www.ldeo.columbia.edu/%7Ebroecker/Home_files/TracersInTheSea_searchable.pdf>
(pp 131-138)
Some more detail in Garcia et al., World Ocean Atlas
Volume 3: Dissolved Oxygen, Apparent Oxygen Utilization, and
Oxygen Saturation.
http://data.nodc.noaa.gov/woa/WOA13/DOC/woa13_vol3.pdf
Thanks,
Ajay
--
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* Upper Ocean Processes Group Mail Stop 29 *
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