在海洋的黄昏区协调碳预算
Sarah L C Giering1, Richard Sanders2, Richard S Lampitt2
11] National Oceanography Centre, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, UK [2] Ocean and Earth Sciences, University of Southampton, European Way, Southampton SO14 3ZH, UK [3] Institute of Biological and Environmental Sciences, Oceanlab, University of Aberdeen, Newburgh AB41 6AA, UK.
Nature
|March 28, 2014
概括
海洋光合作用向深海输出碳,但它的命运尚不清楚. 微生物,在动物浮游生物的帮助下,是重矿化这个沉没的有机碳的关键.
科学领域:
- 海洋生物学 海洋生物学
- 海洋学 海洋学 海洋学
- 生物地质化学生物地质化学
背景情况:
- 表面海洋光合作用产生大量的有机碳,其中一部分出口到深海.
- 沉没碳的重矿化率控制了海洋的碳储存,但碳预算仍然不平衡.
- 了解深海生物群的碳供需平衡至关重要.
研究的目的:
- 为了量化碳的来源和沉没在海洋的黄昏区.
- 确定不同生物在碳重矿化中的作用.
- 阐明控制海洋碳储存的机制.
主要方法:
- 实地测量碳出口和再矿化率.
- 估计异构生物的呼吸速率.
- 应用一个稳定状态模型来平衡碳预算.
主要成果:
- 在 Porcupine Abyssal 平原,碳源和碳汇在观测不确定性范围内得到了平衡.
- Prokaryotes 在暮色区 (501,000m) 占重新矿物化的 7092%.
- 动物浮游生物碎片化沉没颗粒,释放出更多的有机物质,为微生物循环提供燃料.
结论:
- 深海微生物循环受到微生物与动物浮游生物之间的相互作用的显著刺激.
- 这种协同作用在调节海洋作为碳汇的能力方面发挥着至关重要的作用.
- 精确的碳预算需要考虑微生物和动物浮游生物在颗粒处理中的联合活动.
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