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首页> 外文期刊>Ocean Science Discussions >Observations of phytoplankton spring bloom onset triggered by a density front in NW Mediterranean
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Observations of phytoplankton spring bloom onset triggered by a density front in NW Mediterranean

机译：地中海西北部密度前锋引发的浮游植物春季开花的观测

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Phytoplankton bloom in NW Mediterranan sea is a seasonal event that mainly occurrs in a limited area (Gulf of Lyon and Proven?al basin) where this phenomenon is promoted by a cyclonic circulation, strong wind-driven mixing and subsequent spring restratification. At the southern boundary of this area a density front (North Balearic Front) separating denser waters from the lighter Modified Atlantic Waters reservoir at south is suspected to trigger weaker and earlier (late winter) blooms by (a) enhanced pumping of nutrients into the euphotic layer and (b) promoting an early restratification of the water column (by frontal instabilities). A multisensor glider round trip, equipped with CTD and fluorimeter, crossing the frontal area in February–March 2013, allowed to observe the bloom triggering after the decrease of intense wind-driven turbulent convection and mixing. Satellite imagery supports and confirms in-situ observations. It was shown that frontal activity has a relevant role in the promotion and acceleration of the dynamical restratification, with a consequent biological response in terms of primary production. Restratification is necessary preconditioning factor for bloom triggering in frontal area, net of other involved mechanism promoting the bloom as the enhanced biological pump. So, like for high-latitude fronts (Taylor and Ferrari, 2011a), also for this mid-latitude oligotrophic region front seems to promote new production by dynamically enahnced restratification inhibiting mixing. Finally, we argued that Sverdrup's Critical Depth criterion seems to apply in the northern well-mixed area, where the zeroing of heat fluxes (and related turbulent convection) does not correspond to a prompt onset of the bloom (which appeared 1 month later).
机译：西北地中海沿岸的浮游植物开花是一个季节性事件，主要发生在有限区域（里昂湾和普罗旺斯盆地），在这种区域，旋风循环，强风混合和随后的春季再定殖促进了这种现象的发生。在该区域的南部边界，一个密度锋（北巴利阿里锋）被认为将较稠密的水域与南部较轻的修改过的大西洋水库分隔开来，原因是：（a）增强了将营养物泵入富营养区的机会层;（b）促进水柱尽早重新定殖（额叶不稳定）。配备CTD和荧光计的多传感器滑翔机往返飞行，于2013年2月至3月横穿额叶区域，可观察到强风驱动的湍流对流和混合减少后的水华触发。卫星图像支持并确认原位观测。结果表明，额叶活动在促进和加速动态再平衡中具有重要作用，因此在初级生产方面具有生物学响应。重新定殖是触发额叶开花的必要的预处理条件，除其他相关机制外，它还可以促进开花，从而增强生物泵。因此，就像高纬度锋面（Taylor和Ferrari，2011a）一样，中纬度富营养化地区锋线也似乎通过动态增强再平衡抑制混合来促进新的生产。最后，我们认为，Sverdrup的临界深度标准似乎适用于北部充分混合的地区，那里的热通量归零（以及相关的湍流对流）并不对应于水华的迅速发作（1个月后出现）。

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