Characterizing the seasonality of vertical chlorophyll-a profiles in the Southwest Indian Ocean from the Bio-Argo floats
Characterizing the seasonality of vertical chlorophyll-a profiles in the Southwest Indian Ocean from the Bio-Argo floats
复制标题
利用 Bio-Argo 浮标表征西南印度洋垂直叶绿素-a 剖面的季节性
DOI：
10.1016/j.jmarsys.2020.103426
复制
发表时间：
2020-12-01
影响因子：
2.8
通讯作者：
Wang, Guifen
中科院分区：
文献类型：
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作者：
Gu, Yuanyuan;Cheng, Xuhua;Wang, Guifen
卫星观测和数值模拟结果表明，西南印度洋（SWIO）的中、次中尺度过程对浮游植物生长具有重要影响。根据观测部署在SWIO的两个Bio-Argo浮标，一个突出的现象，地下叶绿素a最大值（SCM）观察在该地区在春季，夏季和秋季。通过比较有无混合层限制（ML限制）的Chl-a剖面，发现ML限制有利于春、秋、冬三季上层海洋Chl-a浓度的增加，而夏季则有利于上层海洋Chl-a浓度的降低，这可能是由于营养光共同作用对生长速率的影响。进一步的分析表明，ML的抑制可能是由地面加热和前风驱动的Ekman传输。
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.