The interplay between regeneration and scavenging fluxes drives ocean iron cycling
The interplay between regeneration and scavenging fluxes drives ocean iron cycling
复制标题
再生通量和清除通量之间的相互作用驱动海洋铁循环
作者：
A. Tagliabue;A. Bowie;T. DeVries;M. Ellwood;W. Landing;A. Milne;D. Ohnemus;B. Twining;P. Boyd
尽管最近在观测数据覆盖方面取得了进展，但不同的物理和地球化学过程如何塑造溶解铁分布的定量限制仍然难以捉摸，降低了对铁有限地区未来预测的信心。在这里，我们表明，溶解铁在太平洋模式和中间水循环迅速，并在再生和清除强烈相反的通量控制的速率积累。结合新的数据集内的水团框架表明，几十年溶解铁积累远低于预期的铁再生通量的荟萃分析。这种不匹配只能通过调用显着的铁去除率来平衡铁的再生，这意味着生成自生颗粒铁池来调和。因此，铁的快速内部循环，而不是它的物理传输，是在全球的中间沃茨观测到的铁储量的主要控制和上层海洋铁限制将是非常敏感的内部循环平衡的微妙变化。铁对海洋光合作用至关重要，但缺乏对关键铁循环过程大小的观测限制。在这里，作者使用一系列观测数据集来证明地下铁再供应和去除之间的平衡控制着上层海洋铁的限制。
Despite recent advances in observational data coverage, quantitative constraints on how different physical and biogeochemical processes shape dissolved iron distributions remain elusive, lowering confidence in future projections for iron-limited regions. Here we show that dissolved iron is cycled rapidly in Pacific mode and intermediate water and accumulates at a rate controlled by the strongly opposing fluxes of regeneration and scavenging. Combining new data sets within a watermass framework shows that the multidecadal dissolved iron accumulation is much lower than expected from a meta-analysis of iron regeneration fluxes. This mismatch can only be reconciled by invoking significant rates of iron removal to balance iron regeneration, which imply generation of authigenic particulate iron pools. Consequently, rapid internal cycling of iron, rather than its physical transport, is the main control on observed iron stocks within intermediate waters globally and upper ocean iron limitation will be strongly sensitive to subtle changes to the internal cycling balance. Iron is crucial for marine photosynthesis, but observational constraints on the magnitude of key iron cycle processes are lacking. Here the authors use a range of observational data sets to demonstrate that the balance between iron re-supply and removal in the subsurface controls upper ocean iron limitation.
影响因子：
5.2
作者：
Tagliabue, Alessandro;Aumont, Olivier;Yool, Andrew
通讯作者：
Yool, Andrew
基于钍供应的北大西洋一系列元素的更换时间
影响因子：
5.2
作者：
Hayes C
通讯作者：
Hayes C
影响因子：
18.3
作者：
Moore, C. Mark;Mills, Matthew M.;Woodward, E. Malcolm S.
通讯作者：
Woodward, E. Malcolm S.