Estimating the benthic efflux of dissolved iron on the Ross Sea continental shelf
Estimating the benthic efflux of dissolved iron on the Ross Sea continental shelf
复制标题
估算罗斯海大陆架上溶解铁的底栖流出量
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
D. McGillicuddy
中科院分区：
文献类型：
--
作者：
C. Marsay;P. Sedwick;M. Dinniman;P. M. Barrett;S. Mack;D. McGillicuddy
大陆边缘沉积物为上层海洋提供了潜在的大量但约束不严格的溶解铁（dFe）来源。罗斯海大陆架是一个底栖生物供应被认为在调节季节性初级生产规模方面发挥关键作用的地区。在这里，我们提供了2012年南方夏季收集的数据，揭示了表面低（0.08±0.07 nM）和海底附近高（0.74±0.47 nM） dFe浓度的对比。将这些观测结果与高分辨率物理环流模式的结果相结合，我们估计来自罗斯海大陆架较深部分（>400 m）的dFe流出量为5.8 × 107 mol yr - 1；足以解释在生长季节开始时推断的“冬季储备”dFe库存。此外，在较浅的水深测量中观察到的dFe浓度升高表明，这些特征全年为光区提供了额外的dFe输入。
Continental margin sediments provide a potentially large but poorly constrained source of dissolved iron (dFe) to the upper ocean. The Ross Sea continental shelf is one region where this benthic supply is thought to play a key role in regulating the magnitude of seasonal primary production. Here we present data collected during austral summer 2012 that reveal contrasting low surface (0.08 ± 0.07 nM) and elevated near‐seafloor (0.74 ± 0.47 nM) dFe concentrations. Combining these observations with results from a high‐resolution physical circulation model, we estimate dFe efflux of 5.8 × 107 mol yr−1 from the deeper portions (>400 m) of the Ross Sea continental shelf; more than sufficient to account for the inferred “winter reserve” dFe inventory at the onset of the growing season. In addition, elevated dFe concentrations observed over shallower bathymetry suggest that such features provide additional inputs of dFe to the euphotic zone throughout the year.
DOI：
10.1016/j.dsr.2014.02.003
发表时间：
2014-05-01
影响因子：
2.4
作者：
Wadley, Martin R.;Jickells, Timothy D.;Heywood, Karen J.
通讯作者：
Heywood, Karen J.