Nitrate and silicate responses of a natural phytoplankton community from the Drake Passage to different climate change scenarios ...

• Main Authors: Pausch, Franziska, Koch, Florian, Hassler, Christel S, Bracher, Astrid, Bischof, Kai, Trimborn, Scarlett
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: CO2; diatoms; iron; Light; mixing; Multiple stressors; Ocean acidification; pH; Southern Ocean; Incubation duration; Experimental treatment; Nitrate; Nitrate, standard deviation; Silicate; Silicate, standard deviation; compiled data; Drake Passage
• Online Access: https://dx.doi.org/10.1594/pangaea.942295; https://doi.pangaea.de/10.1594/PANGAEA.942295

Contrasting models predict two different climate change scenarios for the Southern Ocean (SO), forecasting either less or stronger vertical mixing of the water column. To investigate the responses of SO phytoplankton to these future conditions, we sampled a natural diatom dominated (63%) community from today's relatively moderately mixed Drake Passage waters with both low availabilities of iron (Fe) and light. The phytoplankton community was then incubated at these ambient open ocean conditions (low Fe and low light, moderate mixing treatment), representing a control treatment. In addition, the phytoplankton was grown under two future mixing scenarios based on current climate model predictions. Mixing was simulated by changes in light and Fe availabilities. The two future scenarios consisted of a low mixing scenario (low Fe and higher light, low mixing treatment) and a strong mixing scenario (high Fe and low light, strong mixing treatment). In addition, communities of each mixing scenario were exposed to ...