Abstract The energetic mesoscale and submesoscale processes in the Southwest Indian Ocean (SWIO) have a significant effect on phytoplankton growth revealed by satellite observations and numerical simulations. Based on observations from two Bio-Argo floats deployed in the SWIO, a prominent phenomenon of subsurface Chl-a maximum (SCM) is observed in this region during spring, summer and autumn. After comparing the Chl-a profiles with and without mixed layer restratification (ML restratification), we found that the ML restratification favors to increase the upper ocean Chl-a concentration in spring, autumn and winter, while decrease Chl-a concentration in summer, which could be explained by nutrient-light colimitation on growth rates. Further analysis imply ML restratification is likely caused by the surface heating and up-front wind-driven Ekman transport.

中文翻译：

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从 Bio-Argo 浮标表征西南印度洋垂直叶绿素 a 剖面的季节性

摘要 卫星观测和数值模拟揭示了西南印度洋（SWIO）中高能中尺度和亚中尺度过程对浮游植物生长有显着影响。根据部署在 SWIO 中的两个 Bio-Argo 浮标的观察结果，在春季、夏季和秋季期间，在该地区观察到了一个突出的地下 Chl-a 最大值 (SCM) 现象。通过比较有无混合层再分层（ML再分层）的 Chl-a 剖面，我们发现 ML 再分层有利于春季、秋季和冬季增加上层海洋 Chl-a 浓度，而在夏季降低 Chl-a 浓度，这可以通过对生长率的营养光共限来解释。