在南大洋追逐铁的生物可用性:来自Phaeocystis antarctica和铁物种化的见解
Marion Fourquez1,2, David J Janssen3, Tim M Conway4
1Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UMR 110, Marseille 13288, France.
Science advances
|June 28, 2023
概括
南大洋的生物可用溶解铁 (dFe) 比以前认为的更为多样化,影响大气中二氧化碳的吸收. 这种由冰川来源和连接体影响的变异性挑战了当前的铁吸收模型.
科学领域:
- 海洋化学 海洋化学
- 生物地质化学生物地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 溶解铁 (dFe) 的可用性是南洋生物的一个关键限制因素,控制大气中二氧化碳的吸收.
- 生物可用dFe的变化直接影响全球气候调节.
研究的目的:
- 在南洋自然样本中调查溶解铁 (dFe) 生物可用性范围.
- 评估影响dFe生物利用度的因素,不仅仅是度和深度.
- 探索连接物和湿性物质在海洋铁循环中的作用.
主要方法:
- 使用南极洲虫 (Phaeocystis antarctica) 的种类进行了热吸收实验.
- 在各种自然样本条件下对dFe生物可用性的分析.
- 在现场研究dFe的生物可用性和同位素特征.
主要成果:
- 在南大洋中溶解铁 (dFe) 的生物可用性表现出比以前认可的更广泛的范围 (<1~200%的自由无机Fe).
- 在冰川源附近观察到更高的dFe生物利用率,而不依赖dFe度和深度.
- 生物介导的配体,特别是性物质,在海洋铁的生态化学循环中发挥着重要作用.
结论:
- 在现场的dFe度和深度本身是铁吸收的不足预测因素.
- 重新审视性物质的作用对于理解南大洋海洋铁循环是至关重要的.
- 现场dFe生物利用率和同位素特征之间的联系需要进一步调查.
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