identify WIS2 topics to be used for data publication

[tomkralidis]

Following #20 (comment), identify each data centre's WIS2 data publication topics.

• WDC-RSAT (World Data Center for Remote Sensing of the Atmosphere)
• WDCA (World Data Centre for Aerosols)
• WDCGG (World Data Centre for Greenhouse Gases)
• WDCRG (World Data Centre for Reactive Gases)
• WOUDC (World Ozone and UV Data Centre)
• WRDC (World Radiation Data Centre)WDC-RSAT (World Data Center for Remote Sensing of the Atmosphere)

[tomkralidis]

For WOUDC:

WOUDC Dataset category	Topic
Ozone (total column, vertical profile)	atmospheric-composition/observations/gases/ozone
UV irradiance	atmospheric-composition/observations/radiant-latent-heat/ultraviolet-radiation

[markusfiebig]

For WDCA:
atmospheric-composition/observations/Aerosol particles and clouds

[markusfiebig]

For WDCRG:
atmospheric-composition/observations/gases/Reactive gases (excluding stratospheric ozone)

[tomkralidis]

Please note that the reference point for atmospheric composition topics should be the DRAFT that is currently in the WIS2 Topic Hierarchy efforts (https://github.com/wmo-im/wis2-topic-hierarchy/tree/et-acdm-topics/topic-hierarchy/earth-system-discipline/atmospheric-composition).

[ejwelton]

@tomkralidis I've inspected the other topic hierarchies. They have mostly responded with platform or observation methods. For instance, weather and ocean use sub-topics such as "ship", "bouy", "radar", sometimes linked with a variable like temp or wind. Space weather literally just lists satellite missions. We have been approaching the atmos-comp topic quite differently based on prior discussion. So I have some questions first:

1. Is this the last (bottom) level of our hierarchy? For instance, if we added "Aerosol Particles" will there be a sub-topic under that? Its really too broad to be helpful for searching and categorizing. If no sub-topic, then we need to be more specifc at this level. If there is a sub-topic, then we still need to specify that level.
2. Perhaps we should be thinking about grouping similar to other topics? "aerosol-sunphotometer", "aerosol-lidar", "ozone-lidar", "aerosol-insitu" or something similar? I'm not advocating this approach, I think its too vague. But it would have us in-line with the other topics, and if we only have this one topic level then we cannot add a hundred different variable groupings.
3. The space weather group uses mission names (ACE, GEOS, etc). Could we do the same? Maybe a mixture of atmos comp species/method and also networks by name (NDACC, SHADOZ, MPLNET, ACTRIS, etc).
4. If we added network names, then how frequently can this topic be updated? That was a question I had when I saw space weather. They would have to update that at least yearly, if not more freq.

[lakkala]

EUBREWNET:
Ozone, total column -> atmospheric-composition/observations/gases/ozone
spectral UV / UV irradiance -> atmospheric-composition/observations/radiation-latent-heat/ultraviolet-radiation
AOD -> ?
SO2 -> atmospheric-composition/observations/gases/SO2 ?

[atverm]

WDCGG/G3W:

CO2 (carbon dioxide) -> atmospheric-composition/observations/gases/carbon-dioxide
CH4 (methane) -> atmospheric-composition/observations/gases/methane
N2O (nitrous oxide) -> atmospheric-composition/observations/gases/nitrous-oxide
Other LLGHG -> atmospheric-composition/observations/gases/other-llghg

Measurements can be in-situ-surface, in-situ-tower (often vertical profile), in-situ-total-column, in-situ-vertical-profile, in-situ-mobile

Topic should describe also data quality objective (GAW compatibility goal, highest level or extended), data level (NRT, final QAQC), and time resolution and timeliness

[tomkralidis]

FYI issue now opened in wmo-im/wis2-topic-hierarchy#233 with the current proposal.