Patchy productivity in the open ocean
Patchy productivity in the open ocean
复制标题
公海生产力参差不齐
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Provenzale
中科院分区：
文献类型：
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作者：
Adrian P. Martin;K. Richards;A. Bracco;A. Provenzale
在公海的许多区域，局部上升流是初级生产的强大驱动力。这是通过增加营养物的垂直通量来实现的，否则会使地表沃茨饥饿。这种上升流热点对区域生产的影响进行了研究，特别强调三个参数：该地区经历上升流的分数，相对于环境沃茨的上升流区域内的营养通量的增加，以及上升流和环境沃茨之间的水平混合率。它表明，虽然独立地增加这些参数之一，对该地区的生产的影响有限，同时增加它们可以显着增加生产。此外，它表明，上升流区域的空间分布可以有很强的影响生产力。许多小的上升流区域比一个大的上升流热点显着增加产量，即使上升流的总速率在两种情况下是恒定的。这种差异的幅度被证明是由相干结构的存在，如在海洋表面的涡流的影响。全球碳循环模式中的海洋部分还远远不能完全解决中尺度特征。这些结果意味着这些模型可能因此大大低估了海洋大部分地区的初级生产力。
Localized upwelling is a strong driver of primary production in many regions of the open ocean. This is achieved through providing an increased vertical flux of nutrients to otherwise starved surface waters. The impact of such upwelling hot spots on regional production is investigated with particular emphasis on three parameters: the fraction of the region experiencing upwelling, the increase in nutrient flux within upwelling regions with respect to ambient waters, and the rate of horizontal mixing between upwelled and ambient waters. It is demonstrated that although independently increasing one of these parameters has a limited effect on the production of the region, increasing them simultaneously can dramatically increase production. Furthermore, it is shown that the spatial distribution of upwelling regions can have a strong influence on productivity. Numerous small upwelling regions increase production significantly more than one large upwelling hot spot even if the total rate of upwelling is constant for the two cases. The magnitude of this discrepancy is shown to be influenced by the presence of coherent structures such as eddies in the surface ocean. The ocean components of global carbon cycle models are still far from being able to resolve mesoscale features fully. These results imply that such models may be greatly underestimating primary production in large parts of the ocean as a consequence.