Hi Ajay, To me, this doesn't differ significantly from Alison's words except it uses 'parcel of water' rather than 'sea water' and 'in equilibrium with the atmosphere' rather than 'saturation at a pressure of one atmosphere'. My only problem is that CF definitions don't usually include units. Like Nan, I also like the inclusion of the reference in Alison's definition.
Would everybody be happy with: Apparent Oxygen Utilization (AOU) is defined as the difference between the solubility concentration of oxygen in equilibrium with the atmosphere at the temperature and salinity of a parcel of water and the observed dissolved oxygen concentration. It is used to estimate the change in dissolved oxygen in a parcel of water due to biological and chemical processes at depth since it left the surface. 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. We need to agree something. At the moment we seem to be doing everything possible to prevent this Standard Name being accepted!!! Cheers, Roy. ________________________________________ From: Ajay Krishnan - NOAA Affiliate [ajay.krish...@noaa.gov] Sent: 27 February 2015 16:32 To: Lowry, Roy K.; Hernan Garcia - NOAA Federal Cc: alison.pamm...@stfc.ac.uk; cf-metadata@cgd.ucar.edu Subject: Re: [CF-metadata] Request for new standard-name: apparent_oxygen_utilization Hi Alison, I had to defer this to to our subject matter expert, Hernan Garcia. His response is copied below. I am also including Hernan in this email now, just so that we're all on the same page, moving forward. Apparent Oxygen Utilization (AOU) is defined as the difference between the solubility concentration of oxygen in equilibrium with the atmosphere at the temperature and salinity of a parcel of water and the observed dissolved oxygen concentration. It is used to estimate the change in dissolved oxygen in a parcel of water due to biological and chemical processes at depth since it left the surface. AOU and dissolved oxygen concentrations are nominally expressed in micro-moles per kilogram (umol kg^-1) Thanks, Ajay On Fri, Feb 27, 2015 at 3:47 AM, Lowry, Roy K. <r...@bodc.ac.uk<mailto:r...@bodc.ac.uk>> wrote: Hello Alison, Looks good to me. Cheers, Roy. ________________________________________ From: alison.pamm...@stfc.ac.uk<mailto:alison.pamm...@stfc.ac.uk> [alison.pamm...@stfc.ac.uk<mailto:alison.pamm...@stfc.ac.uk>] Sent: 26 February 2015 18:11 To: Lowry, Roy K.; ajay.krish...@noaa.gov<mailto:ajay.krish...@noaa.gov>; cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu> Subject: RE: [CF-metadata] Request for new standard-name: apparent_oxygen_utilization 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<tel:%2B44%201235%20778065> NCAS/Centre for Environmental Data Archival Email: alison.pamm...@stfc.ac.uk<mailto:alison.pamm...@stfc.ac.uk><mailto:j.a.pamm...@rl.ac.uk<mailto:j.a.pamm...@rl.ac.uk>> STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu<mailto:cf-metadata-boun...@cgd.ucar.edu>] On Behalf Of Lowry, Roy K. Sent: 26 February 2015 15:29 To: Ajay Krishnan - NOAA Affiliate; cf-metadata@cgd.ucar.edu<mailto:cf-metadata@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.krish...@noaa.gov<mailto:ajay.krish...@noaa.gov>] Sent: 26 February 2015 14:56 To: cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu><mailto:cf-metadata@cgd.ucar.edu<mailto:cf-metadata@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><http://stfc.ac.uk> alison.pamment at stfc.ac.uk<http://stfc.ac.uk> <mailto:cf-metadata%40cgd.ucar.edu<mailto:cf-metadata%2540cgd.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<http://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. 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