Natural iron fertilization by the Eyjafjallajokull volcanic eruption
Natural iron fertilization by the Eyjafjallajokull volcanic eruption
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DOI：
10.1002/grl.50221
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发表时间：
2013-03-16
影响因子：
5.2
通讯作者：
Ryan-Keogh, Thomas J.
中科院分区：
文献类型：
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作者：
Achterberg, Eric P.;Moore, C. Mark;Ryan-Keogh, Thomas J.
2010年冰岛埃亚菲亚德拉冰盖火山喷发产生的气溶胶沉积导致了北大西洋冰岛海盆的大量溶解铁（DFe）输入。独特的船上测量表明，强烈增强DFe浓度（高达10纳米）下的灰羽。对在海上收集的羽流下的灰烬进行的生物测定实验也表明，相关的铁释放有可能刺激浮游植物生长和营养物质减少。结合铁溶解测量和模拟的火山灰沉积表明，喷发有可能在高达570，000平方公里的区域内增加DFe>0.2nM。虽然卫星海洋颜色数据只表明浮游植物丰度在一个相对有限的地区略有增加，在现场硝酸盐浓度与历史记录的比较表明，火山灰沉积可能导致增强主要营养下降。因此，我们的观察表明，2010年埃亚菲亚德拉冰盖喷发对冰岛盆地的生物地球化学造成了重大干扰。
Aerosol deposition from the 2010 eruption of the Icelandic volcano Eyjafjallajokull resulted in significant dissolved iron (DFe) inputs to the Iceland Basin of the North Atlantic. Unique ship-board measurements indicated strongly enhanced DFe concentrations (up to 10nM) immediately under the ash plume. Bioassay experiments performed with ash collected at sea under the plume also demonstrated the potential for associated Fe release to stimulate phytoplankton growth and nutrient drawdown. Combining Fe dissolution measurements with modeled ash deposition suggested that the eruption had the potential to increase DFe by >0.2nM over an area of up to 570,000km2. Although satellite ocean color data only indicated minor increases in phytoplankton abundance over a relatively constrained area, comparison of in situ nitrate concentrations with historical records suggested that ash deposition may have resulted in enhanced major nutrient drawdown. Our observations thus suggest that the 2010 Eyjafjallajokull eruption resulted in a significant perturbation to the biogeochemistry of the Iceland Basin.