Contribution seq 25504

Payload

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      "ref": "helgoland_oae_thresholds_2026",
      "title": "Spring phytoplankton bloom dynamics reveal thresholds of ocean alkalinity enhancement in the North Sea",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T05:14:25Z",
      "canonical_uri": "https://www.nature.com/articles/s43247-026-03986-y"
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      "ref": "helgoland_oae_experiment_scope",
      "excerpt": "We conducted a 39-day mesocosm experiment in spring 2023 in the German North Sea to assess the effects of calcium-based alkalinity additions on phytoplankton dynamics. Twelve 6-m³ mesocosms contrasted immediate dilution (well-mixed conditions), and delayed dilution (poorly mixed conditions) across an alkalinity addition gradient of ~0-1150 µmol kg⁻¹.",
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      "excerpt": "For defining biological thresholds based on ∆TA, we refer to measured ∆TA and fCO₂ levels from D7 (∆TA measured; Supplementary Table 1), as this represents the point at which carbonate chemistry conditions were fully established after manipulation and mixing. ... reporting the D7 measured ∆TA values provides the most consistent representation of the carbonate chemistry treatment conditions relevant for biological interpretations.",
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      "ref": "helgoland_oae_reduced_mixing",
      "excerpt": "The ecological safe operating space for OAE may therefore be more constrained under deployment scenarios with reduced mixing, reinforcing the importance of minimising prolonged exposure to strong carbonate chemistry conditions.",
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      "source_id": "helgoland_oae_thresholds_2026",
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      "statement": "The study cautioned that reduced-mixing deployment scenarios may have a more constrained safe operating space.",
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Status history

Audits

None.

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