Abstract A coupled physical-biogeochemical model (ROMS-PISCES) forced by climatological fields is used to examine the role of upwelling filaments in the offshore exchange of particulate (POC) and dissolved (DOC) organic carbon in the Canary Current eastern boundary upwelling system (CanC EBUS). In this region, mesoscale filaments at Capes Ghir ( ∼ 30.5 °N) and Juby ( ∼ 27.5 °N) have been frequently described using both observational and numerical data. Due to their semi-permanent presence and unique dynamical characteristics, studies focusing on filaments often provide an incomplete picture of the physical and biological processes at work, and their effects on coast-to-ocean export. The present model experiment confirms the complex three-dimensional structure of the filaments that comprises both offshore and onshore flow components. The model shows strong seasonal variability in the offshore transport mediated by the filaments. Recirculation at the edges of the filaments returns water towards the shore, especially in autumn when they are diverted northwards by the large scale boundary circulation. By contrast, offshore transport peaks during late spring - early summer when onshore recirculation is limited. Overall, the estimated net annual offshore flux of excess total organic carbon (e-TOC, the non-refractory pools of DOC and POC) averages 2.0 × 10 9 kg C y−1, and may increase up to 4.3 × 10 9 kg C y−1 during the peak upwelling season, each filament contributing to export of up to 22.6% of the organic carbon within the first 100 km from shore along the CanC EBUS (between 9.5 and 32 ° N). These results strongly support the inclusion of offshore transport estimates by coastal filaments in regional carbon budgets.

中文翻译：

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加那利洋流系统中上升流丝对有机碳的海上运输

摘要 利用气候场强迫的耦合物理-生物地球化学模型 (ROMS-PISCES) 来研究上升流丝在加那利洋流东部边界上升流系统中颗粒 (POC) 和溶解 (DOC) 有机碳的离岸交换中的作用。 CanC EBUS）。在该地区，经常使用观测和数值数据描述 Capes Ghir（~ 30.5 °N）和 Juby（~ 27.5 °N）的中尺度细丝。由于它们的半永久性存在和独特的动力特性，专注于细丝的研究通常提供了工作中物理和生物过程的不完整图片，以及它们对海岸到海洋出口的影响。本模型实验证实了包括海上和陆上流动分量的细丝的复杂三维结构。该模型显示了由长丝介导的海上运输的强烈季节性变化。细丝边缘的再循环使水返回海岸，特别是在秋季，当它们被大规模边界环流向北转移时。相比之下，海上运输在晚春至初夏达到高峰，此时陆上再循环受到限制。总体而言，估计的过量总有机碳（e-TOC，DOC 和 POC 的非耐火池）的年度净海上通量平均为 2.0 × 10 9 kg C y−1，并可能增加到 4.3 × 10 9 kg C在上升流高峰季节的 y−1 期间，每根细丝在离岸边沿 CanC EBUS（9.5 到 32°N）的前 100 公里内输出高达 22.6% 的有机碳。