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 ________________________________________ From: CF-metadata [[email protected]] on behalf of John Graybeal [[email protected]] Sent: 13 February 2015 17:56 To: Jonathan Gregory Cc: CF Metadata List Subject: Re: [CF-metadata] Request for new standard-name: apparent_oxygen_utilization While I agree with your argument that apparent_oxygen_utilization is not ideal as a standard name, it will be a big win for a large community of important ocean science users, who will often be searching on and using the AOU concept; and a relatively small loss for non-oceanographic users, who will quickly be able find the name or meaning of the term as needed. I'm definitely not an expert, but it wasn't hard to discover the derivation, meaning, and widespread adoption of the term. (The next 3 weeks will test that claim, I suppose. :->) John On Feb 13, 2015, at 05:22, Jonathan Gregory <[email protected]> wrote: > Dear Roy > > OK, that's all right then. > > Not intending to change my mind about agreeing to AOU, but just to make clear > that the reason this is not my personal preference is because the idea of a > concentration excess over saturation is an easy-to-understand physical > concept. > If we described the quantity like that, anyone would understand it, I guess. > Describing it as apparent oxygen utilization refers to some biogeochemical > understanding, I presume, which I don't have, and no-one but an expert will > know what it means when that term is used. Hence, if that quantity appears in > a dataset which covers all sorts of quantities e.g. from an ocean model that > includes biogeochemistry, some users of the data will find AOU unhelpful as a > standard name. This seems regrettable to me, and we try to avoid obscurity in > standard names for that reason. But, as I said, if I'm the only person who > thinks that about this instance, I'm not going to hold out for it. > > Best wishes > > Jonathan > > ----- Forwarded message from "Lowry, Roy K." <[email protected]> ----- > >> Date: Thu, 12 Feb 2015 10:02:49 +0000 >> From: "Lowry, Roy K." <[email protected]> >> To: Jonathan Gregory <[email protected]>, John Graybeal >> <[email protected]> >> CC: CF Metadata List <[email protected]> >> Subject: RE: [CF-metadata] Request for new standard-name: >> apparent_oxygen_utilization >> >> Dear Jonathan, >> >> Many thanks. That's a point worth considering, but although the >> oceanographic community use many different physical dimensions for dissolved >> oxygen concentrations (vol/vol, mass/vol, mol/vol, mol/mass) I am unaware of >> anybody deviating from the physical dimensions used by Wally Broeker for AOU >> when the quantity was defined, which is mol/vol (i.e. mol m-3). I therefore >> feel there is no need for an indication of dimensionality in the Standard >> Name. In the unlikely event that practices should change in the future we >> have aliases as a safety net. >> >> Cheers, Roy. >> ________________________________________ >> From: Jonathan Gregory [[email protected]] >> Sent: 12 February 2015 08:56 >> To: John Graybeal >> Cc: CF Metadata List >> Subject: Re: [CF-metadata] Request for new standard-name: >> apparent_oxygen_utilization >> >> Dear John >> >> Thanks for your research. If I'm in a small minority or alone in preferring a >> self-explanatory term then I'll accept the majority view. Do you find that >> this >> quantity always has the same physical dimensions (canonical unit in CF >> terms)? >> A possible cause of confusion would be if, for instance, the same term is >> used >> to mean both kg m-3 and mol m-3. In that case it might help to indicate which >> it is in the standard name. >> >> Best wishes >> >> Jonathan >> >> On Wed, Feb 11, 2015 at 11:21:40AM -0800, John Graybeal wrote: >>> Date: Wed, 11 Feb 2015 11:21:40 -0800 >>> From: John Graybeal <[email protected]> >>> To: CF Metadata List <[email protected]> >>> Subject: Re: [CF-metadata] Request for new standard-name: >>> apparent_oxygen_utilization >>> X-Mailer: Apple Mail (2.1878.6) >>> >>> This discussion has been ongoing a while (though with few participants), >>> and I think it is valuable to the ocean community to resolve it quickly if >>> possible. >>> >>> After a quick round of on-line reading (and absent any uptake on creating >>> an alias), I vote for using apparent_oxygen_utilization. >>> >>> The key sentence for me was in Encyclopedia of Earth content: 'This is a >>> method of estimating the amount of dissolved oxygen utilized by marine >>> organisms via respiration, although it is termed "apparent" for a reason.' >>> (Which it then explains, and contrasts to True Oxygen Utilization.) The >>> fact the term is universally known, taught, and used in the oceanography >>> realm; does not seem to have any ambiguous uses in other domains; and >>> fairly well captures the gist of the concept, says to me it's OK to use it. >>> Even if it is functional rather than naming. >>> >>> I'd tweak the definition slightly: >>> >>>> AOU, Apparent Oxygen Utilization, is defined as the difference between the >>>> saturation oxygen concentration in water at 1 atmosphere, and the observed >>>> oxygen concentration (e.g., Broecker and Peng, 1982). It is a standard >>>> calculation made by oceanographers to estimate non-physical effects on >>>> oxygen, where non-physical means biological processes (uptake/release and >>>> chemical reaction). >>> >>> >>> If it turns out in the future this name causes trouble, we have a mechanism >>> to fix it. But I think the domain-specific name will benefit CF more than >>> hurt it. >>> >>> John >>> >>> --------------- >>> John Graybeal >>> Marine Metadata Interoperability Project: http://marinemetadata.org >>> MMI Ontology Registry and Repository: http://mmisw.org/orr >>> >>> >>> On Feb 2, 2015, at 07:02, Nan Galbraith <[email protected]> wrote: >>> >>>> 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 <[email protected]> ----- >>>>> >>>>>> Date: Mon, 26 Jan 2015 09:20:54 -0500 >>>>>> From: Nan Galbraith <[email protected]> >>>>>> To: [email protected] >>>>>> 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 >>> >>> >>> >>> On Jan 20, 2015, at 10:50, Lowry, Roy K. <[email protected]> wrote: >>> >>>> 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 [[email protected]] >>>> Sent: 20 January 2015 18:35 >>>> To: [email protected] >>>> 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 <[email protected]> >>>> To: Nan Galbraith <[email protected]> >>>> >>>> >>>> >>>> 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 <[email protected] <mailto:[email protected]>> >>>> To: Ajay Krishnan - NOAA Affiliate <[email protected] >>>> <mailto:[email protected]>> >>>> 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 <[email protected] >>>> <mailto:[email protected]>> 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 >>>>> <[email protected] <mailto:[email protected]>> 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 >>>>> >>> >> >>> _______________________________________________ >>> CF-metadata mailing list >>> [email protected] >>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata >> >> _______________________________________________ >> CF-metadata mailing list >> [email protected] >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata >> >> This message (and any attachments) is for the recipient only. 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