Volcanic ash as an oceanic iron source and sink
Volcanic ash as an oceanic iron source and sink
复制标题
DOI：
10.1002/2016gl067905
复制
发表时间：
2016-03
影响因子：
5.2
通讯作者：
Nicholas Rogan;E. Achterberg;Frédéric A. C. Le Moigne;C. Marsay;A. Tagliabue;Richard G. Williams
中科院分区：
文献类型：
--
作者：
Nicholas Rogan;E. Achterberg;Frédéric A. C. Le Moigne;C. Marsay;A. Tagliabue;Richard G. Williams
火山灰沉积到海洋形成了铁（Fe）的天然来源，形成了地表水微生物群落。产岩物质的输入也可能通过扫食促进铁的去除。结合溶解铁（dFe）和钍- 234观测和建模，我们研究了Eyjafjallajökull火山爆发后北大西洋对铁的清除。在典型条件下，生物颗粒在清除中占主导地位，而火山灰颗粒在喷发中占主导地位。颗粒的大小很重要，因为较小的清除颗粒可以被表面结合的离子饱和。模型模拟表明，与Eyjafjallajökull相关的灰沉积可能导致净铁去除。我们的模型表明，如果火山灰沉积发生在生长季节晚些时候，当该地区铁有限时，生物活性的刺激将增加三倍。在评估火山灰沉积对海洋铁循环和生产力的影响时，需要考虑火山灰颗粒清除、喷发时间和颗粒饱和度的影响。
Volcanic ash deposition to the ocean forms a natural source of iron (Fe) to surface water microbial communities. Inputs of lithogenic material may also facilitate Fe removal through scavenging. Combining dissolved Fe (dFe) and thorium‐234 observations alongside modeling, we investigate scavenging of Fe in the North Atlantic following the Eyjafjallajökull volcanic eruption. Under typical conditions biogenic particles dominate scavenging, whereas ash particles dominate during the eruption. The size of particles is important as smaller scavenging particles can become saturated with surface‐associated ions. Model simulations indicate that ash deposition associated with Eyjafjallajökull likely led to net Fe removal. Our model suggests a threefold greater stimulation of biological activity if ash deposition had occurred later in the growing season when the region was Fe limited. The implications of ash particle scavenging, eruption timing, and particle saturation need to be considered when assessing the impact of ash deposition on the ocean Fe cycle and productivity.