在未来的海洋中增强的二氧化出口引发了全球藻的减少
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
概括
海洋酸化改变了沉没的海洋物质中的和的比率,影响了藻种群. 这项研究揭示了由于减少酸的可用性而导致藻的预计全球减少.
科学领域:
- 海洋生物学 海洋生物学
- 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:
- 藻是重要的初级生产者,占海洋产量的高达40%.
- 它们需要酸来生长和形成.
- 藻通常被认为是抗性,甚至是受益于海洋酸化.
研究的目的:
- 研究海洋酸化对藻和海洋生物地球化学循环的全球影响.
- 了解降低pH对循环和藻群体结构的影响.
主要方法:
- 在现场中宇宙实验与自然浮游生物群落.
- 全球沉积物陷数据的分析.
- 地球系统模型模拟.
主要成果:
- 在预计的2100年条件下,海洋酸化使沉降生物质的 (Si) 与 (N) 的比率增加了17%.
- 这种转变归因于在较低的pH值下,二氧化溶解速度较慢.
- 全球沉积物陷数据证实了pH对水柱Si:N比率的影响.
结论:
- 预计未来的海洋酸化将减少二氧化的溶解,从而减少表面酸的可用性.
- 这将导致预计到2200年藻的全球数量减少13-26% .
- 这些发现突出了地球系统的意想不到的反,改变了我们目前对海洋酸化影响的理解.
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