The influence of wind-induced mixing on the vertical distribution of buoyant and sinking phytoplankton species
The influence of wind-induced mixing on the vertical distribution of buoyant and sinking phytoplankton species
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DOI：
10.1007/s10452-008-9167-x
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发表时间：
2009-06-01
期刊：
影响因子：
1.8
通讯作者：
George, D. Glen
中科院分区：
文献类型：
--
作者：
Moreno-Ostos, Enrique;Cruz-Pizarro, Luis;George, D. Glen
在这项研究中，我们利用高分辨率自主监测的最新进展，调查短期变化的影响，风引起的混合表面生物量和垂直分布的浮游植物种类的浮力和下沉。一个自主平台（自动水质监测站）停泊在地中海水库，提供了冬季和夏季风速和浮游植物荧光的每分钟记录。这些信息被用来量化短期天气变化对硅藻和蓝藻垂直分布的影响。此外，我们应用一个经验模型来确定夹带的硅藻和蓝藻内的湍流上层的水柱的程度。在冬季，荧光的表面时间序列与风速的短期变化呈正相关。相反，在夏季，荧光与风速呈负相关。在后一种情况下，湍流克服了浮游蓝藻的漂浮速度，从而破坏了它们的垂直分布，减少了表面生物量。在这两种情况下，表层浮游植物生物量的动态响应的短期变化，风应力是迅速的，在分钟尺度。据我们所知，从文献中，这是第一个研究中，风应力和表面浮游植物荧光之间的相互作用已经量化在这样一个精细的时间尺度。最后，预测和油藏管理的相关性。
In this study we exploit recent advances in high-resolution autonomous monitoring to investigate the impact of short-term variations in wind-induced mixing on the surface biomass and vertical distribution of buoyant and sinking phytoplankton species. An autonomous platform (the Automatic Water Quality Monitoring Station) moored in a Mediterranean reservoir provided minute-by-minute records of wind speed and the phytoplankton fluorescence during winter and summer. This information was then used here to quantify the impact of short-term changes in the weather on the vertical distribution of diatoms and cyanobacteria. Additionally, we apply an empirical model to determine the extent of entrainment of diatoms and cyanobacteria within the turbulent upper layers of the water column. During winter, the surface time series of fluorescence was positively correlated with the short-term variations in wind speed. In contrast, during the summer, fluorescence was negatively correlated with wind speed. In the latter case, turbulence overcame the flotation velocity of buoyant cyanobacteria, thus homogenizing their vertical distribution and decreasing surface biomass. In both cases, the dynamic response of surface phytoplankton biomass to short-term changes in wind stress was rapid, within the minute scale. As far as we know from the literature, this is the first study in which the interaction between wind stress and surface phytoplankton fluorescence has been quantified on such a fine temporal scale. Finally, relevance for forecasting and reservoir management is pointed out.