Hi Nan,
AOU could certainly be determined in fresh water, but there's a history in Standard Names of understanding 'sea_water' to include the whole hydrographic domain. There have been discussions (that I don't want to resurrect) on this topic in the past - it would be madness to have fresh_water_temperature in addition to sea_water_temperature: I have datasets running from the North Sea (salinity 34.5) right up the Humber river system into pure freshwater and don't fancy changing Standard Name part way through the data stream. On this basis I was happy with Alison's wording.
Cheers, Roy.
________________________________________
From: Nan Galbraith [ngalbraith at whoi.edu]
Sent: 26 February 2015 18:46
To: cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] Request for new standard-name: apparent_oxygen_utilization
Thanks, Alison -
Your definition looks good to me. Good to include the reference, too.
Maybe Ajay can tell us whether this needs to be limited to sea water,
or if the concept is also used in fresh water work?
- Nan
On 2/26/15 1:11 PM, alison.pamment at stfc.ac.uk<mailto:alison.pamment at stfc.ac.uk> wrote:
Dear Ajay, Roy, All,
Thank you for the clarification regarding units.
We are now settled on
apparent_oxygen_utilization (mol kg-1).
We do already have a couple of ocean biogeochemistry names referring to ?nitrate utilization? so I think this new name is in keeping with those.
Based on the definition provided by Ajay and John Graybeal?s suggested wording, I have currently written the definition as:
?Apparent Oxygen Utilization (often abbreviated as AOU) is the difference between the saturation concentration of oxygen in sea water at a pressure of 1 atmosphere (101325 Pa) and the observed oxygen concentration. It is used to estimate the change in oxygen concentration due to biological and chemical processes. Reference: Broecker, W. S. and T. H. Peng (1982), Tracers in the Sea, Lamont-Doherty Earth Observatory, Palisades, N. Y.? I have deliberately included ?in sea water? in the first sentence of the definition to make it clear that this is an oceanographic quantity.
Does this all look OK? If so, then I think the name can be accepted for inclusion in the standard name table.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamment at stfc.ac.uk<mailto:J.A.Pamment at rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Lowry, Roy K.
Sent: 26 February 2015 15:29
To: Ajay Krishnan - NOAA Affiliate; cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>
Subject: Re: [CF-metadata] Request for new standard-name: apparent_oxygen_utilization
Hi Alison,
Just to clarify that I am in total agreement with this and had a bit of a senior moment in a previous message.
Cheers, Roy.
________________________________
From: Ajay Krishnan - NOAA Affiliate [ajay.krishnan at noaa.gov<mailto:ajay.krishnan at noaa.gov>]
Sent: 26 February 2015 14:56
To: cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>
Subject: Re: [CF-metadata] Request for new standard-name: apparent_oxygen_utilization
Hi Alison,
Yes, please use mol kg-1 as the canonical unit.
Thanks,
Ajay
alison.pamment at stfc.ac.uk<
http://stfc.ac.uk> alison.pamment at stfc.ac.uk <mailto:cf-metadata%40cgd.ucar.edu?Subject=Re%3A%20%5BCF-metadata%5D%20Request%20for%20new%0A%09standard-name%3A%09apparent_oxygen_utilization&In-Reply-To=%3C014539AC4976BE4490A360410A8C20178A2D6062%40EXCHMBX01.fed.cclrc.ac.uk%3E>
Thu Feb 26 03:56:32 MST 2015
Dear All,
Thank you for the constructive discussion of this proposal - it seems that agreement has been reached on apparent_oxygen_utilisation with canonical units of mol kg-1. (Just to double check: is this the correct unit for use with the World Ocean Database, which I believe is the reason for requesting the name in the first place. Units of mol m-3 have also been mentioned in this discussion, but this could be a misunderstanding.
Best wishes,
Alison
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Received on Fri Feb 27 2015 - 02:11:57 GMT
