Iron supply and demand in an Antarctic shelf ecosystem
Iron supply and demand in an Antarctic shelf ecosystem
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DOI：
10.1002/2015gl065727
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发表时间：
2015-10
影响因子：
5.2
通讯作者：
D. McGillicuddy;P. Sedwick;M. Dinniman;K. Arrigo;T. Bibby;B. Greenan;E. Hofmann;J. Klinck;W. Smith;S. Mack;C. Marsay;B. Sohst;G. Dijken
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作者：
D. McGillicuddy;P. Sedwick;M. Dinniman;K. Arrigo;T. Bibby;B. Greenan;E. Hofmann;J. Klinck;W. Smith;S. Mack;C. Marsay;B. Sohst;G. Dijken
罗斯海维持着丰富的生态系统，是南大洋最具生产力的部分。大部分生产发生在11-2月期间的多尼雅，这时溶解铁(DFE)的可获得性被认为对浮游植物的生长起主要控制作用。在这里，我们结合了关于DFE分布的新数据、对冰川融化和区域环流的高分辨率模式模拟，以及基于卫星的初级产量估计，以量化罗斯海大陆架上的铁供应和需求。我们的分析表明，进入真光层的DFE的最大来源是冬季混合和融化的海冰，来自环极深水的侵入输入较少，来自冰川融化的输入较少。这些来源加在一起与从基于卫星的生产力算法推断的年度生物DFE需求大致平衡，尽管供需估计都有很大的不确定性。
The Ross Sea sustains a rich ecosystem and is the most productive sector of the Southern Ocean. Most of this production occurs within a polynya during the November–February period, when the availability of dissolved iron (dFe) is thought to exert the major control on phytoplankton growth. Here we combine new data on the distribution of dFe, high‐resolution model simulations of ice melt and regional circulation, and satellite‐based estimates of primary production to quantify iron supply and demand over the Ross Sea continental shelf. Our analysis suggests that the largest sources of dFe to the euphotic zone are wintertime mixing and melting sea ice, with a lesser input from intrusions of Circumpolar Deep Water and a small amount from melting glacial ice. Together these sources are in approximate balance with the annual biological dFe demand inferred from satellite‐based productivity algorithms, although both the supply and demand estimates have large uncertainties.