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Modelling a simple mechanism for the formation of phytoplankton thin layers using large-eddy simulation: in situ growth
Marine Ecology Progress Series ( IF 2.5 ) Pub Date : 2020-10-29 , DOI: 10.3354/meps13471
A Brereton 1 , Y Noh 1 , S Raasch 2
Affiliation  

ABSTRACT: A curious phenomenon found in phytoplankton communities is the forming of socalled thin layers, wherein phytoplankton biomass can stretch out kilometres in the horizontal but only a few metres in the vertical. These layers are typically found at the pycnocline, just below the surface mixed layer. Thin layers are usually attributed to a range of complex environmental and species-dependent factors. However, we believe that, given the frequency at which this phenomenon is observed, a simpler mechanism is at play. In this study, we found that phytoplankton thin layers can be attributed simply to a decreasing light availability with depth, when there is an abundance of nutrients in the euphotic zone and below the mixed layer. This mechanism was ascertained using a number of modelling approaches ranging in complexity from analytical solutions of a simple 1-dimensional plankton model to a 3-dimensional biophysical model incorporating large-eddy simulation. The conditions which, according to the results of our study, allow thin layers to form are ubiquitous in the coastal ocean and are therefore a likely candidate explanation as to why planktonic thin layers are so frequently observed.

中文翻译:

使用大涡模拟为浮游植物薄层形成的简单机制建模:原位生长

摘要:在浮游植物群落中发现的一个奇怪现象是所谓的薄层的形成,其中浮游植物的生物量可以在水平方向延伸数公里,而在垂直方向延伸数米。这些层通常在比可可啉的表面混合层下面。薄层通常归因于一系列复杂的环境和物种相关因素。但是,我们认为,鉴于观察到这种现象的频率,一种更简单的机制正在发挥作用。在这项研究中,我们发现,当在富营养区和混合层以下存在大量营养素时,浮游植物薄层可以简单地归因于随深度的光利用率降低。这种机制是使用多种建模方法确定的,这些方法的复杂程度从简单的一维浮游生物模型的解析解到包含大涡流仿真的3维生物物理模型,不一而足。根据我们的研究结果,允许薄层形成的条件在沿海海洋中无处不在,因此可能解释了为什么如此频繁地观察到浮游性薄层。
更新日期:2020-10-30
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