Investigation into the impact of storms on sustaining summer primary productivity in the Sub‐Antarctic Ocean
Investigation into the impact of storms on sustaining summer primary productivity in the Sub‐Antarctic Ocean
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调查风暴对维持亚南极海洋夏季初级生产力的影响
DOI：
10.1002/2016gl069973
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发表时间：
2016
影响因子：
5.2
通讯作者：
P. Monteiro
中科院分区：
文献类型：
--
作者：
S. Nicholson;M. Lévy;Joan Llort;S. Swart;P. Monteiro
在亚南极海洋，浮游植物生物量的升高持续到夏季，而由于铁的限制，生产力预计会很低。生物铁回收已被证明支持夏季生物量。此外，我们调查了铁的供应机制，以前在铁预算研究。使用1-D地球化学模型，我们展示了风暴驱动的混合如何通过生产层下方的铁夹带来缓解浮游植物铁的限制。当表面混合层下方存在一个扩散系数很强的混合过渡层（kz > 10−4 m2 s−1）时，这种效应就很明显了。这种次表层混合已被证明是由湍流海洋动力学和风暴驱动的惯性运动之间的相互作用引起的。此外，季节内混合产生的夏季初级生产力增加了60%。这些结果强调需要获得地下混合的观测，并为海洋地球化学模型开发适当的参数化。
In the Sub‐Antarctic Ocean elevated phytoplankton biomass persists through summer at a time when productivity is expected to be low due to iron limitation. Biological iron recycling has been shown to support summer biomass. In addition, we investigate an iron supply mechanism previously unaccounted for in iron budget studies. Using a 1‐D biogeochemical model, we show how storm‐driven mixing provides relief from phytoplankton iron limitation through the entrainment of iron beneath the productive layer. This effect is significant when a mixing transition layer of strong diffusivities (kz > 10−4 m2 s−1) is present beneath the surface‐mixing layer. Such subsurface mixing has been shown to arise from interactions between turbulent ocean dynamics and storm‐driven inertial motions. The addition of intraseasonal mixing yielded increases of up to 60% in summer primary production. These results stress the need to acquire observations of subsurface mixing and to develop the appropriate parameterizations of such phenomena for ocean‐biogeochemical models.