COSIMA TWG Meeting Minutes 2025

COSIMA TWG
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Date: May 21, 2025
Chair: @cbull
Attendees: @cbull, @dougiesquire, @helen, @ezhilabareesh8, @anton, @MartinDix, @AndyHoggAnu, @PaulSpence, @aekiss, @sofarrell

Ocean Team Survey

  • Ocean team survey is available here
  • All staff, including those not formally in the ocean team, are encouraged to complete it.
  • Purpose: To gather feedback on team collaboration and workflows. Responses will inform potential changes.

Model Development Meeting Planning

  • Config Documentation Presentation (Anton): To support other teams needing configuration documentation.
  • Release Definitions Discussion: Clarify terms like alpha, beta, and release across the organization.
  • Config documentation discussion should be delayed until the documentation team finalizes a template.
  • The release discussion could be informal and framed as sharing the ocean team’s experience.
  • Potential to invite someone from the release team to participate.

Work Plan and Community Engagement

  • Hive forum discussion on workload and priorities is here
  • SAC Feedback: Emphasis on prioritizing an 8 km resolution model.
  • Concerns Raised:
    • Risk of overcommitting to an 8 km alpha release by end of FY26.
    • Need to balance 25 km evaluation (for CM3) with community interest in 8 km.
  • Considerations:
    • 25 km model is foundational for CM3 and must be evaluated first.
    • Community is more engaged with high-resolution Antarctic modeling (8 km).
    • Discussion on whether to proceed with 25 km and 8 km in parallel or sequentially.

Evaluation Paper Planning

  • Purpose: To formalize model evaluation, engage the community, and provide documentation.
  • Scope Discussion:
    • Whether to focus on 25 km, 8 km, or include other configurations (e.g., WaveWatch III, Wombat).
    • Comparisons between OM2 and OM3, and potentially between OM3 resolutions.
    • Whether to publish a peer-reviewed paper or a technical report with DOI.
  • Community Engagement:
    • Paper could encourage ECRs to contribute.
    • Need to ensure contributors to 25 km scripts are credited in future 8 km papers.
  • Action Items:
    • Draft agenda for next week’s meeting to scope the paper.
    • Use Hive forum here to coordinate and collect agenda items.

Alpha Release Status

  • Goal: Release a new alpha version this week to support Minghang’s work.
  • Status Update:
    • Generic tracers: Complete
    • Build flags: Pending confirmation
    • MOM6 update: Awaiting merge
    • MOM6 metrics: Delayed
  • Next Steps: Sprint planned to finalize configuration and documentation.

Mediterranean Sea Salinity Issue

  • Problem: Excessive salinity in the eastern Mediterranean in ESM 1.6 due to limited salt transport.
  • Findings:
    • Bathymetry shows unrealistic depth and width at the Strait of Sicily.
    • Maximum depth is only 50m in UV grid, compared to ~300m in ACCESS-OM2 01
  • Recommendations:
    • Adjust Sicily strait depth and possibly width to improve flow.
    • Compare salt transport and Nile runoff with ACCESS-OM2 01

Next Steps

  • Finalize alpha release
  • Paul to invite broader community to the evaluation paper scoping meeting.
  • Coordinate agenda and participation for evaluation paper meeting.