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Impact of the North Equatorial Current meandering on a pelagic ecosystem: A modeling approach

机译：赤道北部弯道对远洋生态系统的影响：一种建模方法

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A modeling study was conducted to investigate the effects of time-dependent mesoscale meandering of the North Equatorial Current on a pelagic ecosystem in the southwestern Canary Basin. The North Equatorial Current jet was represented as a quasi-geostrophic flow using a two-layer model; a standard bulk mixed layer model is included. Two cases for the biological/physical coupled model were examined: (a) a nutrient-phytoplankton-zooplankton (NPZ) model and (b) the addition of a sinking detritus pool (NPZD) in the ecosystem. The horizontal length scale of simulated eddies is 100 to 200 km. The surface eddy kinetic energy has a peak value of 110 cm~2/s~2 and a mean value of 26 cm~2/s~2 in the simulated North Equatorial Current. Maximum vertical velocity is of the order of 1.5 m/day at 100 m depth, the base of the mixed layer. The additional nutrients due to eddy upwelling lead to a maximum increase of phytoplankton biomass up to 26% located at the edge of eddies. This trend is even more pronounced when introducing a detritus pool with a 1 m/day sinking velocity into the ecosystem (33%). When upwelling events are seldom present at "mooring" sites, it is the particulate organic carbon input by horizontal advection which feeds the carbon loss by detritus sinking. At "mooring" sites undergoing upwelling events, the upwelled carbon flux largely dominates losses by sedimentation and leads to a 10% enhancement of the sinking exported carbon flux. When the eddies are resolved, the mean values of the primary and exported productions in the jet zone are doubled. The results suggest that the vertical motion due to eddies and eddy-eddy interactions in a weak (10 cm/s) horizontal current such as the North Equatorial Current can be a non-negligible source of nitrogen-nutrients for oceanic plankton production in the mixed layer.
机译：进行了建模研究，以研究北赤道洋流随时间变化的中尺度弯曲对西南金丝雀盆地中上层生态系统的影响。使用两层模型将北赤道水流表示为准地转流；包括一个标准的本体混合层模型。研究了两种生物/物理耦合模型：（a）营养-浮游植物-浮游动物（NPZ）模型，（b）在生态系统中增加了沉没碎屑池（NPZD）。模拟涡流的水平长度范围为100至200 km。在模拟的北赤道流中，表面涡动能的峰值为110 cm〜2 / s〜2，平均值为26 cm〜2 / s〜2。在100 m深度（混合层的基础）上，最大垂直速度约为1.5 m / day。由于涡流上升而产生的额外营养物导致浮游植物生物量最大增加，位于涡流边缘的浮游生物量最多可达26％。当向生态系统中引入沉降速度为1 m / day的碎屑池时，这种趋势更加明显（33％）。当在“系泊”位置很少出现上升流事件时，水平对流输入的颗粒有机碳将通过碎屑沉入来补充碳损失。在发生上涌事件的“系泊”位置，上涌的碳通量在很大程度上控制了沉积造成的损失，并导致下沉的出口碳通量增加了10％。解决了涡流后，射流区内初级产品和出口产品的平均值加倍。结果表明，在弱（10 cm / s）水平洋流中（例如北赤道洋流），由于涡流和涡流相互作用而引起的垂直运动可能是混合海洋中浮游生物生产中不可忽略的氮营养来源。层。

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