Iron released from Antarctic ice controls the biological carbon pump in the surrounding Southern Ocean

南极冰释放的铁控制着周围南大洋的生物碳泵

• 批准号: 2275008
• 金额: --
• 依托单位: Plymouth University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2275008
• 关键词: Iron; released; Antarctic; ice; controls

The Southern Ocean surrounding Antarctica accounts for nearly 40% of the global oceanic sink of anthropogenic carbon dioxide emissions. Understanding the mechanisms that regulate this carbon sink is fundamental in forecasting impacts on the Earth system under future climate change scenarios. The ocean's 'biological pump' is integral to this carbon sink and consists of phytoplankton assimilating carbon dioxide into organic matter through photosynthesis. Iron is essential for the growth and productivity of phytoplankton and where it exists in deficient concentrations, such as the Southern Ocean, it controls the efficiency of this pump. The overall aim of this project will be to assess the bioavailability of different iron sources and what effect these have on microbial growth. To achieve this, you will study iron availability from different end-member samples (e.g. glacial/sea-ice, seawaters and sediments) and, in conjunction with other oceanographic data (e.g. light/irradiance), form a better understanding of microbial responses to iron availability in this globally important region. This project will provide an exciting and rare opportunity to study the transport and bioavailability of iron in the Southern Ocean and become part of a UK team studying this region as part of the NERC RoSES research programme.

南极洲周围的南大洋占全球人为二氧化碳排放海洋汇的近40%。了解调节这种碳汇的机制对于预测未来气候变化情景下对地球系统的影响至关重要。海洋的“生物泵”是这个碳汇不可或缺的组成部分，由浮游植物通过光合作用将二氧化碳吸收为有机物组成。铁对于浮游植物的生长和生产力是必不可少的，在缺乏铁的地方，如南大洋，它控制着这个泵的效率。该项目的总体目标是评估不同铁源的生物利用度以及这些铁源对微生物生长的影响。为了实现这一目标，您将研究来自不同端元样品（例如冰川/海冰，海水和沉积物）的铁可用性，并结合其他海洋学数据（例如光/辐照度），更好地了解微生物对这个全球重要地区铁可用性的反应。该项目将提供一个令人兴奋和难得的机会，研究铁在南大洋的运输和生物利用度，并成为研究该地区的英国团队的一部分，作为NERC Roses研究计划的一部分。