Iron limits primary productivity during spring bloom development in the central North Atlantic
Iron limits primary productivity during spring bloom development in the central North Atlantic
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DOI：
10.1111/j.1365-2486.2006.01122.x
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发表时间：
2006-04-01
影响因子：
11.6
通讯作者：
La Roche, J
中科院分区：
文献类型：
--
作者：
Moore, CM;Mills, MM;La Roche, J
我们提出了在原位生物物理测量和生物测定实验，证明铁的初级生产力的限制，在北大西洋中部的春季水华。质量平衡计算表明，硝酸盐下降是铁（Fe）的限制，风成铁供应这一地区不能支持最大的浮游植物生长在水华。使用一个简单的模拟模型，我们表明，解除铁限制在春季水华可以增加硝酸盐下降，因此，新的初级生产，70%。我们的结论是，由粉尘沉积提供的铁的情节性是一个重要的因素控制春季水华的动态。从这一点上，我们假设，响应风成铁供应的春季水华的时间和幅度的变化将影响碳下降和食物网动态在北大西洋中部。
We present in situ biophysical measurements and bioassay experiments that demonstrate iron limitation of primary productivity during the spring bloom in the central North Atlantic. Mass balance calculations indicate that nitrate drawdown is iron (Fe)-limited and that aeolian Fe supply to this region cannot support maximal phytoplankton growth during the bloom. Using a simple simulation model, we show that relief of Fe limitation during the spring bloom can increase nitrate drawdown and, hence, new primary production, by 70%. We conclude that the episodic nature of iron supplied by dust deposition is an important factor controlling the dynamics of the spring bloom. From this, we hypothesize that variability in the timing and magnitude of the spring bloom in response to aeolian Fe supply will affect carbon drawdown and food web dynamics in the central North Atlantic.