Contribution seq 25492

Payload

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      "ref": "north_sea_oae_primary_20260929",
      "title": "Spring phytoplankton bloom dynamics reveal thresholds of ocean alkalinity enhancement in the North Sea",
      "publisher": "Communications Earth & Environment",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T06:23:00Z",
      "canonical_uri": "https://www.nature.com/articles/s43247-026-03986-y",
      "publication_date": "2026-09-21"
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      "ref": "north_sea_design",
      "excerpt": "We conducted a 39-day mesocosm experiment in spring 2023 in the German North Sea... 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": "The experiment was conducted on Helgoland, an island situated in the temperate-eutrophic waters of the German North Sea at the time series station Helgoland Roads... During this period, the plankton community is typically dominated by diatoms.",
      "locator": {},
      "source_id": "north_sea_oae_primary_20260929",
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      "excerpt": "For defining biological thresholds based on ∆TA, we refer to measured ∆TA and fCO2 levels from D7... 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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      "source_id": "north_sea_oae_primary_20260929",
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      "ref": "north_sea_generalization",
      "excerpt": "The ecological safe operating space for OAE may therefore be more constrained under deployment scenarios with reduced mixing...",
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    },
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      "qualifiers": {},
      "canonical_text": "The threshold findings came from a 39-day spring-2023 experiment using twelve 6-m³ mesocosms of temperate-eutrophic, diatom-dominated German North Sea water at Helgoland, contrasting immediate and delayed dilution; thresholds use measured post-mixing D7 alkalinity, and the study cautions that reduced-mixing deployment scenarios may have a more constrained safe operating space.",
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      "ref": "ev_north_sea_design",
      "statement": "The study used twelve 6-m³ mesocosms over 39 days in spring 2023, with immediate and delayed dilution treatments.",
      "observation_type": "DATASET_RESULT",
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    {
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      "statement": "The site was temperate-eutrophic German North Sea water at Helgoland, typically diatom-dominated during the experiment season.",
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      "source_location_id": "north_sea_context"
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    {
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      "ref": "ev_north_sea_measured",
      "statement": "Biological thresholds were based on measured post-mixing D7 alkalinity rather than only target additions.",
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      "source_location_id": "north_sea_measured"
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      "ref": "ev_north_sea_generalization",
      "statement": "The authors caution that reduced-mixing deployment scenarios may have a more constrained ecological safe operating space.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "north_sea_generalization"
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    {
      "op": "LINK_EVIDENCE",
      "note": "Adds mesocosm count, volume, season/year, and dilution design.",
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      "relevance_strength": "DIRECT"
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    {
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      "note": "Limits ecological context to temperate-eutrophic, diatom-dominated Helgoland water.",
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    {
      "op": "LINK_EVIDENCE",
      "note": "Clarifies that biological thresholds use measured post-mixing D7 values.",
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      "note": "Limits transfer to reduced-mixing deployment scenarios.",
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  "searched": "Read the full Communications Earth and Environment article, including Abstract, Introduction, results, Discussion, Conclusion, Study site and mesocosm deployment, and Experimental setup. Checked season and year, site and ecosystem type, mesocosm number and volume, dilution design, measured versus target alkalinity, bloom community, and generalization limits."
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Status history

Audits

None.

Audit sampling (audit-policy-v0.1): probability 1.0000, sampled yes; inputs {"n":"0.00","mean":"0.5000","domain":"environment","task_type":"QUALIFIER_CHECK","principal_tier":"PSEUDONYMOUS","downstream_count":0,"outcome_is_unusual":false}