ET‐ACDM 2025‐3: 19 August - wmo-im/et-acdm GitHub Wiki

Date and Time

19 August 2025 11:00 UTC (13:00 CET)

Venue

telecon

Participants

Jörg Klausen, Kaisa Lakkala, Kentaro Ishijima, Keiichi Sato, Debra Kollonige, Alex Vermeulen, Tom Kralidis, Kaisa Lakkala, Lingaona Zhu (Secretariat), Julie Bourdeu (Secretariat) and Sergi Moreno (Secretariat)

Agenda

1. Approval of minutes from previous meeting

Minutes approved:

https://github.com/wmo-im/et-acdm/wiki/ET%E2%80%90ACDM-2025%E2%80%902:-28-May-2025

  • Jörg highlighted need for the group to monitor data centres that may be under pressure (financial, structural, or technical).

  • The current GAWSIS-OSCAR/Surface will not be supported by MeteoSwiss after early 2027; discussions ongoing with EUMETNET for possible collaboration. Login authentication will remain until Q3/2026.

2. GAW updates from Secretariat

  • SAG Ozone and SAG GHG joint meeting (July):
    • Ozone: Draft strategy for future of the global ozone observing system requested by 31 October (focus on Brewer/Dobson replacement, complementarity of networks, alternatives to costly intercomparisons).
    • GHG: Nearly finalised Greenhouse Gas Measurement Guidelines (to be key for training/monitoring).
    • Next GHG Measurement Techniques meeting planned in South Africa (2026).
    • Vienna Convention Trust Fund: new mandate emerging to support monitoring of ozone-depleting substances-ODS (halocarbons, HCFCs, etc.); possible early-stage projects under discussion.
  • NOAA Global Monitoring Laboratory: flask sampling programme face severe funding uncertainty. Risk to long-term records (Mauna Loa, South Pole, etc.).
  • WMO Secretariat restructuring: ~10% staff reduction expected. GAW not directly affected (funded via extrabudgetary sources).
  • O3 intercomparison instruments from Spain: most returned; delays remain with Egypt, Kenya, Uganda. Lesson learned on customs/transit challenges.

3. Level 0 data (Kaisa, 20')

https://github.com/wmo-im/et-acdm/issues/23

  • Kaisa's slides
  • General consensus:
    • Focus on enabling reproducibility and reprocessing.
    • Centralized archiving at data centres where possible.
    • SAGs to provide guidance on what is required scientifically.
    • Need to balance ambition with resources, especially in developing countries.

4. WOUDC 2.0, user services and technology behind the portal

Presentation: https://github.com/wmo-im/et-acdm/blob/master/docs/wiki/woudc-updates-sag-ozone-uv-2025.pdf

Links:

  • Launch of WOUDC 2.0 platform in June 2025.

    • Lighter technology and infrastructure footprint;
    • Search interface provides both raw file downloads and API/web services;
    • WOUDC will become a WIS 2.0 facility for publishing data, sending real-time notifications via broker;
    • Dobson cross section corrections in progress;
    • All code and tools made open-source on GitHub (including Python library and Jupyter notebooks).

  • WIS 2.0 registration process for WDC is ongoing; may require re-submission of official letters from Permanent Representatives (seen as redundant by some).

  • The mechanism with respect to Eubrewnet, NDACC or SHADOZ data files has not changed. Data remains in each network's data centre as a single data point, but can be searched through WOUDC.

  • WOUDC backs up data every week and has a recovery plan.

  • Suggestion to have cash data from other data centres because of the instability in the whole system.

Action: To open an issue to explore DCs cashing data from other DC

cf. https://github.com/wmo-im/et-acdm/issues/27

5. Presentation on the planned webtool for monitoring GAW network

Postponed 30/09/2025

6. Discussion about KPIs

https://github.com/wmo-im/et-acdm/issues/26

Postponed 30/09/2025

6. AOB, next meeting 30 September at 11:00 UTC