Abstract The seasonal and interannual variability of chlorophyll a was studied between 2008 and 2016 in two coastal bays located in the northeastern limit of the Iberia/Canary upwelling ecosystem. The work aims (i) to understand if small latitudinal distances and/or coastline orientation can promote different chlorophyll a seasonal cycles; and (ii) to investigate if different meteorological and oceanographic variables can explain the differences observed on seasonal cycles. Results indicate three main biological seasons with different patterns in the two studied bays. A uni-modal pattern with a short early summer maximum and relatively low chlorophyll a concentration characterized the westernmost sector of the South coast, while a uni-modal pattern characterized by high biomass over a long period, slightly higher in spring than in summer, and high chlorophyll a concentration characterized the central West coast. Comparisons made between satellite estimates of chlorophyll a and in situ data in one of the bays revealed some important differences, namely the overestimation of concentrations and the anticipation of the beginning and end time of the productive period by satellite. Cross-correlation analyses were performed for phytoplankton biomass and different meteorological and oceanographic variables (SST, PAR, UI, MLD and precipitation) using different time lags to identify the drivers that promote the growth and the high levels of phytoplankton biomass. PAR contributed to the increase of phytoplankton biomass observed during winter/mid-spring, while upwelling and SST were the main explanatory drivers to the high Chl-a concentrations observed in late-spring/summer. Zonal transport was the variable that contributed most to the phytoplankton biomass during late-spring/summer in Lisbon Bay, while the meridional transport combined with SST was more important in Lagos Bay.

中文翻译：

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描述两个东北大西洋沿岸海湾浮游植物生物量季节性周期的特征

摘要 研究了 2008 年至 2016 年间位于伊比利亚/加那利上升流生态系统东北端的两个沿海海湾中叶绿素 a 的季节性和年际变化。这项工作的目的是 (i) 了解小纬度距离和/或海岸线方向是否可以促进不同的叶绿素季节性循环；(ii) 调查不同的气象和海洋变量是否可以解释在季节性周期中观察到的差异。结果表明在两个研究的海湾中具有不同模式的三个主要生物季节。具有较短的初夏最大值和相对较低的叶绿素 a 浓度的单峰模式是南海岸最西端的特征，而单峰模式的特点是长期高生物量，春季略高于夏季，和高叶绿素 a 浓度的特点是中西海岸。对叶绿素 a 的卫星估计与其中一个海湾的原位数据进行的比较揭示了一些重要的差异，即高估了浓度以及卫星对生产期开始和结束时间的预测。使用不同的时间滞后对浮游植物生物量和不同的气象和海洋变量（SST、PAR、UI、MLD 和降水）进行互相关分析，以确定促进浮游植物生物量增长和高水平的驱动因素。PAR 有助于在冬季/中春季观察到的浮游植物生物量的增加，而上升流和 SST 是在晚春/夏季观察到的高 Chl-a 浓度的主要解释驱动因素。