南大洋的铁丰富实验:碳循环在高Si和低Si水域
Kenneth H Coale1, Kenneth S Johnson, Francisco P Chavez
1Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, CA 95039-9647, USA. coale@mlml.calstate.edu
Science (New York, N.Y.)
|April 17, 2004
概括
南大洋的铁缩大大促进了植物浮游生物的生长,影响了碳吸收和大气中的二氧化碳水平. 这突出了铁.
科学领域:
- 海洋化学 海洋化学
- 生物海洋学是生物海洋学.
- 气候科学是气候科学.
背景情况:
- 铁的可用性控制了海洋生物的生产力,并影响了大气中的二氧化碳水平在冰川周期.
- 南大洋是一个关键的地区,因为它的庞大尺寸和高酸盐度.
- 植物浮游生物的生长,特别是藻,可以由铁和酸限制,区域差异很大.
研究的目的:
- 为了研究铁丰富对南大洋植物浮游生物生长的影响.
- 为了研究不同度的酸如何影响铁对生物生产力的影响.
- 了解铁在碳吸收和大气二氧化碳调节中的作用.
主要方法:
- 在南大洋进行了两次大尺度实验.
- 用铁丰富了特定的海洋区域,以观察效应.
- 在酸度高低的地区之间比较结果.
主要成果:
- 铁缩显著增强了植物浮游生物的生长.
- 铁的影响因酸度而异,影响藻生长.
- 铁在控制海洋碳吸收方面发挥了关键作用.
结论:
- 铁是调节南大洋生物生产率和碳循环的关键因素.
- 了解铁和酸相互作用对于预测海洋对气候变化的反应至关重要.
- 铁的丰富直接影响大气中二氧化碳的部分压力.
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