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Standard names: Adding reference epoch sentence to anomaly terms #27
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Although "climatology" is used in isccp_cloud_area_fraction, it simply expands the acronym: ISCCP = International Satellite Cloud Climatology Project. There is no climatological period needed or used in defining isccp_cloud_area_fraction. Similarly, the use of climatology in the description of change_over_time_in_sea_water_absolute_salinity and sea_water_absolute_salinity may not imply a climatological period is needed in defining these quantities. Perhaps an ocean expert can comment. |
@taylor13 I added those three standard names to the list based on a simple search for the term climatology in standard name descriptions, just so that any such standard name should not be accidentally overlooked. The intention was by no means to imply that they ought to have a reference period specified but rather to give the opportunity for others to step in and say, as you just did, that this is not necessary/relevant. As a matter of understanding (and not arguing with you!): as the specified "climatology" represents the "ISCCP epoch" could there be a value for data users to have this specified in the metadata even though the project as such is widely known? @feggleton I think the suggested sentence to add is well crafted, but from @davidhassell's comment I got the impression that adding such a sentence to the definition of a standard name may have implications for the existing usage of the term. Is that right? |
Understood. Thanks for identifying all the variables that warranted some review. Regarding the "ISCCP epoch", my understanding is that although the algorithms developed to determine the isccp_cloud_area_fraction were developed during a particular time, these algorithms do not depend to any significant degree on the climate of that period. They can be applied to any cloud field. |
Thanks for clarifying, much appreciated! /Lars |
Does the
where TAR, AR4 and AR5 refer to different IPCC assessment reports, which used different reference periods. Could the rule here be the same as for any other coordinate variable: the dimensions of the reference time for variable The definition of |
This issue has had no activity in the last 30 days. This is a reminder to please comment on standard name requests to assist with agreement and acceptance. Standard name moderators are also reminded to review @feggleton @japamment |
@martinjuckes: I think that your examples/use cases make a lot of sense. As does the rule you refer to
The description of teh |
I have a few additional standard names that take a
What do we need to do to add some reference_epoch boilerplate added to the descriptions of those standard names? |
Hello @sethmcg @taylor13 @larsbarring, I am coming back to this conversation after the migration of currently active and closed issues relating to standard names to the new vocabularies repo on GitHub. The first possibility I could see would be adding I would suggest adding the above description to the names @feggleton has mentioned from issue #188 (I believe @roy-lowry and @larsbarring were involved in finding these):
as well as @sethmcg's names in the comment above this one:
Are there any objections to this? Happy to continue the discussion if I've misunderstood/oversimplified. Best regards, |
Dear Ellie Thanks for reviving this issue. I agree with your approach. In your proposed text, it would be helpful to mention the word "climatology" as well, since it's commonly used e.g. "To specify the reference (baseline or climatological) epoch ...". I think the "As specifying" sentence should include the possibility of there being a scalar reference epoch, which is the commonest case. I suggest, "... provide a coordinate variable with standard name The text is very likely to apply to any standard name including Best wishes Jonathan |
Regarding Jonathan's last paragraph immediately above, I don't think changes are needed to |
For the phrasebank, I think rather than saying "To specify the reference (baseline) epoch to which the quantity applies", I would say something like "To specify the reference (baseline) epoch used in deriving the quantity". An anomaly doesn't apply to a baseline, the baseline is used to calculate the anomaly. Do we need the last sentence? I think it's a little confusing, and may not be correct: "As when specifying any other coordinate variable: the dimensions of the reference time for variable X should be a subset of the dimensions of X." The |
Proposer's name Francesca Eggleton (not original proposer)
Date 20-10-2020
In #188 it was mentioned that we should add a sentence about using the reference_epoch into the definition of terms which are anomalies or related. The following terms were suggested:
air_pressure_anomaly | Pa | | 26
air_temperature_anomaly | K | | 25
brightness_temperature_anomaly | K | |
geopotential_height_anomaly | m | | 27
ratio_of_sea_water_potential_temperature_anomaly_to_relaxation_timescale | K s-1 | |
ratio_of_sea_water_practical_salinity_anomaly_to_relaxation_timescale | s-1 | |
sea_water_temperature_anomaly | K | |
surface_temperature_anomaly | K | |
change_over_time_in_sea_water_absolute_salinity
isccp_cloud_area_fraction
sea_water_absolute_salinity
The comment can be seen here: #188
Sentence suggested: "To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch."
Please add any other names or comments about this below.
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