Announce: Atmosphere Working Group

Atmosphere Working Group
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Atmosphere WG meeting 24.06.2026

For a calendar invite, simply click on the relevant calendar link below

Agenda:

  1. Admin: Volunteer for taking today’s meeting minutes to post here on the Forum.

  2. ACCESS Community updates: (5mins)

    • Introduce Andrew Brown (recently appointed Atmosphere WG co-chair)

  3. From SVN to Git - A gentle introduction to contemporary suite development on Gadi Ben Schroeter, ACCESS-NRI (12+5mins)
    CABLE development successfully transitioned from SVN to Git in 2023, paving the way to more robust and collaborative model development. Ben will share some lessons learned, a brief example of switching your suite over to git and how ACCESS-AM3 suite development fits into the broader development infrastructure at ACCESS-NRI.

    :backhand_index_pointing_right: See Ben’s video: detailed instructions on working with Git delivered to the Land Surface community

  4. ACCESS-AM2 aerosol sensitivity to dimethyl sulfide emissions associated with Antarctic sea ice Alanah Chapman (12+5mins)
    The complex interactions between radiation, clouds and aerosol remains the largest source of uncertainty in estimates of climate sensitivity to anthropogenic emissions. In the remote Southern Ocean far from anthropogenic sources, climate models significantly underestimate the number of aerosol particles, which importantly affect cloud properties, precipitation and radiation. Efforts to improve aerosol representation have so far shown limited success, highlighting issues with the aerosol to cloud microphysical processes within climate models. Recent work has suggested that improving natural aerosol processes may be a key part to improving the modelling for this region. This work explores the sensitivity of ACCESS-AM2 to dimethyl sulfide (DMS) emissions from Antarctic sea ice, a source not represented in global climate models. Alanah will share recent results comparing observations and modelled DMS and aerosol, highlighting the high (unrealistic) emission DMS run shows improvements to modelled aerosol number concentrations. These results indicate issues in the simple DMS oxidation scheme and sulfate aerosol production pathways within ACCESS.

  5. Discussion: ACCESS-AM3-chem configuration (N96) Martin Dix (5mins)

    • What should be included in a beta release of ACCESS-AM3-chem configuration on ACCESS-NRI 2026/27 Work plan?

  6. ACCESS Community Workshop: Connecting Machine Learning to Earth System Science Melbourne, 19-21 Aug 2026. Heidi Nettelbeck (5mins)
    :backhand_index_pointing_right: Register now Draft program.pdf

    • Atmosphere WG annual meeting: at 15:30-16:15 on 20 August (Day 2)
    • Agenda ideas/discussions?

  7. EOI 2026: Visualisation Project with ACCESS-NRI Heidi Nettelbeck (5mins)
    ACCESS-NRI is inviting expressions of interest from researchers to collaborate on a 3-6 month visualisation project. We’re offering technical support and expert guidance to help you bring your science to life.

    • Call open until 15 July 2026

  8. UKCA science meeting
    University of Leeds, 15-17 July. Sonya Fiddes (2mins)
    Comprises a conference (remote attendance possible) followed by a hackathon (in-person only). More details: UKCA2026_flyer.pdf

  9. Compute/storage resources: Heidi Nettelbeck (2mins)
    Any experiment proposals for Q2/2026 (2 MSU allocation)?
    → See here for how to apply for Atmosphere WG Resources.

  10. Next Atmosphere WG meeting: July 2026

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!!Reminder: Atmosphere WG meeting 24.06.2026

For a calendar invite, simply click on the relevant calendar link below

Agenda:

  1. Admin: Volunteer for taking today’s meeting minutes to post here on the Forum.

  2. ACCESS Community updates: (5mins)

    • Introduce Andrew Brown (recently appointed Atmosphere WG co-chair)

  3. From SVN to Git - A gentle introduction to contemporary suite development on Gadi Ben Schroeter, ACCESS-NRI (12+4mins)
    CABLE development successfully transitioned from SVN to Git in 2023, paving the way to more robust and collaborative model development. Ben will share some lessons learned, a brief example of switching your suite over to git and how ACCESS-AM3 suite development fits into the broader development infrastructure at ACCESS-NRI.

    :backhand_index_pointing_right: See Ben’s video: detailed instructions on working with Git delivered to the Land Surface community

  4. ACCESS-AM2 aerosol sensitivity to dimethyl sulfide emissions associated with Antarctic sea ice Alanah Chapman (12+4mins)
    The complex interactions between radiation, clouds and aerosol remains the largest source of uncertainty in estimates of climate sensitivity to anthropogenic emissions. In the remote Southern Ocean far from anthropogenic sources, climate models significantly underestimate the number of aerosol particles, which importantly affect cloud properties, precipitation and radiation. Efforts to improve aerosol representation have so far shown limited success, highlighting issues with the aerosol to cloud microphysical processes within climate models. Recent work has suggested that improving natural aerosol processes may be a key part to improving the modelling for this region. This work explores the sensitivity of ACCESS-AM2 to dimethyl sulfide (DMS) emissions from Antarctic sea ice, a source not represented in global climate models. Alanah will share recent results comparing observations and modelled DMS and aerosol, highlighting the high (unrealistic) emission DMS run shows improvements to modelled aerosol number concentrations. These results indicate issues in the simple DMS oxidation scheme and sulfate aerosol production pathways within ACCESS.

  5. Discussion: ACCESS-AM3-chem configuration (N96) Martin Dix (5mins)

    • What should be included in a beta release of ACCESS-AM3-chem configuration on ACCESS-NRI 2026/27 Work plan?

  6. ACCESS-AM3 evaluation (N512): need your help! Heidi Nettelbeck (5mins)

    • W21C now has a 2-year high-resolution ACCESS-AM3 (N512) and need your help to evaluate the model by writing and sharing code! Currently, we’re collating a list of potential figures/analyses, where we’d need volunteers to write and share code on this AM3-evaluation GitHub repository . An AM3-evaluation meeting planned for 6 Aug, and a tutorial of how to contribute scripts on the AM3-evaluation GitHub repository is also planned.

  7. ACCESS Community Workshop: Connecting Machine Learning to Earth System Science Melbourne, 19-21 Aug 2026. Heidi Nettelbeck (5mins)
    :backhand_index_pointing_right: Register now Draft program.pdf

    • Atmosphere WG annual meeting: at 15:30-16:15 on 20 August (Day 2)
    • Agenda ideas/discussions?

  8. EOI 2026: Visualisation Project with ACCESS-NRI Heidi Nettelbeck (2mins)
    ACCESS-NRI is inviting expressions of interest from researchers to collaborate on a 3-6 month visualisation project. We’re offering technical support and expert guidance to help you bring your science to life.

    • Call open until 15 July 2026

  9. ACCESS-NRI documentation: Read the Docs Heidi Nettelbeck (2mins)
    Over the next 2–3 weeks, ACCESS-NRI will be transitioning all of our documentation sites to a new hosting platform - Read the Docs. For most users, this should be barely noticeable and won’t change how you access or contribute to sites. You can read more about the transition in this Forum post.

  10. UKCA science meeting
    University of Leeds, 15-17 July. Sonya Fiddes (2mins)
    Comprises a conference (remote attendance possible) followed by a hackathon (in-person only). More details: UKCA2026_flyer.pdf

  11. Compute/storage resources: Heidi Nettelbeck (2mins)
    Any experiment proposals for Q2/2026 (2 MSU allocation)?
    → See here for how to apply for Atmosphere WG Resources.

  12. Next Atmosphere WG meeting: July 2026