Hi Nan,
I must admit a little discomfort watching the process of CF semantic modelling replacing a well-known term with something that nobody in the domain would recognise without significant education. I didn't comment because I as a semantic modeller I can see both sides. However, I think you're right and Wally Broecker's work is so well absorbed into biogeochemistry that we should respect his terminology.
Cheers, Roy.
________________________________________
From: Nan Galbraith [ngalbraith at whoi.edu]
Sent: 20 January 2015 18:35
To: cf-metadata at 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.krishnan at noaa.gov>
To: Nan Galbraith <ngalbraith at 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.boyer at noaa.gov <mailto:tim.boyer at noaa.gov>>
To: Ajay Krishnan - NOAA Affiliate <ajay.krishnan at noaa.gov
<mailto:ajay.krishnan at 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 <ngalbraith at whoi.edu
<mailto:ngalbraith at 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.krishnan at noaa.gov <mailto:ajay.krishnan at 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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* Nan Galbraith Information Systems Specialist *
* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543(508) 289-2444 <tel:%28508%29%20289-2444> *
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