将来の海洋におけるシリカの輸出の増加は,地球規模の藻の減少を引き起こします
Jan Taucher1, Lennart T Bach2, A E Friederike Prowe3
1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany. jtaucher@geomar.de.
Nature
|May 25, 2022
まとめ
海洋酸性化により 沈没する海洋物質のシリコンと窒素の比率が変化し 藻類の個体数に影響します この研究は,シリコン酸の利用可能性が低下したため,地球規模でダイアトムの減少が予測されていることを明らかにしています.
科学分野:
- 海洋生物学
- 生地化学
- 海洋学
背景:
- ダイアトムは海洋産物の40%を占める 重要な原産物です
- 成長と貝殻形成には シリチウム酸が必要です
- ダイアトムは海洋酸性化に 耐性があると考えられています
研究 の 目的:
- 海洋酸性化がダイアトムや海洋生物化学サイクルに及ぼす地球規模の影響を調査する.
- シリコンサイクルと藻のコミュニティ構造に対するpHの低下の影響を理解する.
主な方法:
- プランクトンの自然環境でのメソコスム実験
- 世界的な堆積物トラップのデータ分析
- 地球システムモデルのシミュレーション
主要な成果:
- 海洋酸性化により,シリコン (Si) と窒素 (N) の比率は2100年の予測条件で17%増加しました.
- このシフトは,より低いpHでシリカ溶解が遅いことに起因する.
- 全球的な堆積物トラップデータは,水柱のSi:N比に対するpHの影響を確認した.
結論:
- 将来の海洋酸化は,シリカ溶解を減少させ,表面のシリカ酸の可用性を減少させると予測されています.
- 2200年までに13~26%の世界的に減少すると予測されています
- この発見は,海洋酸化の影響に関する現在の理解を変える予期せぬ地球システムのフィードバックを強調しています.
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