藻通过南大洋次极黄昏区的低效转移
J R Williams1, S L C Giering2, C A Baker2
1School of Ocean and Earth Science, University of Southampton, Southampton, UK.
Nature geoscience
|January 17, 2025
概括
南大洋中的二氧化不能有效地将碳转移到深海. 其他过程,而不是藻骨,推动碳出口,这表明气候变化对碳储存的影响可能被高估了.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋生物地质化学海洋生物地质化学
- 气候科学 气候科学
背景情况:
- 南洋对于全球碳循环和通过生物碳调节大气中的二氧化碳至关重要.
- 据信,以其二氧化骨架 (珀石) 的二氧化可以增强向深海的碳出口.
- 关于 diatoms 和 opal 在微粒有机碳流中的作用存在相互矛盾的数据,特别是在黄昏区.
研究的目的:
- 为了研究藻,石和南大洋中的微粒有机碳流之间的机械联系.
- 为了评估碳转移到深度在亚极南大洋的黄昏区域的效率.
- 确定藻在不断变化的气候条件下作为碳储存载体的作用.
主要方法:
- 在南极亚极海洋的不同部门进行了直接的春季流量测量.
- 分析的重点是光区的有机碳颗粒和珀流.
- 研究了影响碳转移的因素,例如藻浮力和牧草活动.
主要成果:
- 在亚极黄昏区域的大片地区观察到高效的碳向深层转移.
- 来自藻骨的石在很大程度上被保留在海洋表面,并没有对深层碳出口做出重大贡献.
- 对碳出口的二氧化碳压力效应被诸如浮力调节和放牧者重新包装等过程所否定.
结论:
- 在地表水中藻的存在并不能保证通过它们的骨架将高效的碳转移到深海.
- 南大洋的碳出口是由除了藻弹之外的其他机制驱动的.
- 气候变化引起的植物浮游生物群落的变化可能对隔离的碳池的影响比以前预测的要小.
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