在SOFeX过程中以机器人观察增强的碳生物质和55度的出口
James K B Bishop1, Todd J Wood, Russ E Davis
1Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, CA 94720, USA. JKBishop@lbl.gov
概括
在南大洋的铁化肥显著提高了碳生物质和出口到100米深的深度. 这项研究在2002年南洋铁实验 (SOFeX) 中观察到高酸盐,低酸盐水中的结果高于预期.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋化学 海洋化学
- 生物地质化学循环的过程
背景情况:
- 南大洋水域的特点是酸盐度高,酸盐度低.
- 铁是这些高营养,低 (HNLC) 地区植物浮游生物生长的限制营养素.
- 了解碳出口对于评估海洋在气候调节中的作用至关重要.
研究的目的:
- 调查铁肥对南大洋表面水中的碳生物质和出口的影响.
- 在2002年南洋铁实验 (SOFeX) 中量化碳出口到100米深.
- 在高酸盐,低酸盐环境中分析铁添加和碳出口之间的关系.
主要方法:
- 使用自主造型浮标进行现场测量.
- 在SOFeX期间进行了控制和"补丁"实验.
- 监控碳生物质变化和碳出口流量到100m.
主要成果:
- 观察到铁改水中的碳生物质增加了四倍以上.
- 通过100米深度,碳出口量增加了两到六倍.
- 发现添加的铁与出口的碳的摩尔比为10^4到10^5.
- 铁改低酸盐水的生物质积累和出口明显高于预期.
结论:
- 铁化肥是南大洋碳生物质生产和出口的强大驱动力.
- 在低酸盐水中观察到的高碳出口挑战了以前的假设.
- 需要进一步的研究,才能充分理解HNLC地区的铁受精对生物地化学的影响.
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