Basin-scale changes in net primary production from the biogeochemical-Argo array.

Basin-scale net primary production trends from the biogeochemical-Argo array show statistically significant declines in the Atlantic and Southern Oceans and increases in the Pacific.

• Why it matters: Surface-only remote sensing can miss subsurface variability, limiting detection of how ocean productivity changes with climate forcing.
• What they did: Using biogeochemical-Argo float profiles, the carbon-based production algorithm estimated basin-scale net primary production change, then compared trend direction and magnitude with satellite results.
• The result: The observed trends align with satellites and enable sustained monitoring of ocean productivity change, raising concern if linked to climate forcing.

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