CHLA Reprocessing – Updates & Resources

• The BGC-Argo program is undertaking its first high-impact reprocessing of CHLA data to improve accuracy and usability.
• A new physiological ratio will be applied during the Real-Time Adjustment of CHLA (Sauzède et al., 2025; DOI:10.17882/105732).
• This adjustment will have a significant impact on BGC-Argo CHLA data, with changes by a factor of ~4 in certain areas, such as the Southern Ocean.
• This reprocessing may have a significant impact on end-users. During the transition period, beginning in June 2026, please note that the dataset may temporarily lack homogeneity.

If you are interested in the details of the new Real-Time physiological ratio computation, the timeline for operationalization, and the broader implications of this update for ocean science and operational applications, please follow our webinar.

• Link to the webinar registration (pre-event):
  Register for the Zoom Webinar – Tuesday, May 12, 2026, 16:00 CEST / 14:00 UTC)
• Link to the webinar recording (post-event):
  4D-BGC webinars are recorded. Previous presentations can be found on our YouTube channel.

• Countdown: Visual timer tracking progress toward the June 8, 2026 implementation.
• Progress Tracker:
• % of data reprocessed (real-time updates).
• Circular progress bar per DAC (starting at 0%).
• Interactive Map: Visual representation of processed vs. unprocessed floats (→ choose two adequate colors : to do).