三分之一的南洋生产力来自于尘埃沉积
Jakob Weis1,2, Zanna Chase3,4, Christina Schallenberg5,6
1Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Hobart, Tasmania, Australia. jakob.weis@utas.edu.au.
Nature
|May 15, 2024
概括
风吹起来的尘埃在南大洋中显著地施肥, 这种铁肥料占海洋的三分之一以上
科学领域:
- 海洋学
- 生物地质化学
- 古气候学
背景情况:
- 建议通过南大洋的风吹尘土进行自然铁肥, 以提高生物生产力和影响气候.
- 之前的研究缺乏对这一过程的年度和盆地范围的量化.
研究的目的:
- 通过实证方法量化南大洋的灰尘-铁沉积和年度社区净产量 (ANCP) 之间的关系.
- 确定目前和最后一个冰川时期 (LGM) 粉尘铁受精的生物反应.
主要方法:
- 通过自主海洋生物化学分析的浮动物进行了11年的酸盐观测.
- 使用南半球尘埃模拟来模拟尘埃-铁沉积.
- 推导出尘埃铁与ANCP之间的经验关系.
主要成果:
- 据估计,尘埃铁目前支持南洋ANCP的33%±15%.
- 在LGM期间,尘埃沉积率高出5-40倍,尘埃对ANCP的贡献估计为64%±13%.
- 提供了盆地范围内的粉尘-铁肥的定量证据.
结论:
- 在每年和冰川间的时间尺度上,粉铁肥料在南洋生物生产力中起着重要作用.
- 这一过程对全球碳循环和气候调节产生重大影响.
- 突出了尘埃在调节海洋生态系统和气候方面的重要性.
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