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

围绕南极洲的南大洋占全球海洋人为二氧化碳排放量的近40%。了解调节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一部分，由浮游植物通过光合作用将二氧化碳吸收成有机物组成。铁对浮游植物的生长和生产力至关重要，在铁浓度不足的地方，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及其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），更好地了解这个全球重要地区微生物对铁可用性的反应。该项目将为研究南大洋铁的运输和生物利用度提供一个令人兴奋和难得的机会，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。

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.