Isotopic approaches to unravelling export and recycling processes in the Southern Ocean

全球变暖导致南极洲的冰大量退缩，导致沿海地区的铁输入增加，可能会为浮游植物生长受限的海洋地区提供营养。西南极半岛（WAP）陆架是全球变暖最快、冰量减少风险最大的地区之一。因此，了解促进CO2吸收的主要过程对于预测增加Fe输入对生态地球化学循环的潜在影响至关重要。玛格丽特湾，位于WAP，被认为是一个“高回收，低出口”的地区，以大型硅藻为主的水华，低转移效率的深水，和密集的反硝化和放牧在上层水柱。该项目旨在利用铁和硅同位素地球化学研究玛格丽特湾出口和回收的主要驱动因素。

Global warming is leading to considerable ice retreat in Antarctica resulting in enhanced iron input into coastal areas, potentially feeding ocean regions where phytoplankton growth is otherwise Fe-limited. West Antarctic Peninsula (WAP) shelf is one of the fastest warming regions at most risk from ice decline. Therefore, it is crucial to understand the main processes promoting CO2 uptake to forecast the potential impact of increased Fe input on biogeochemical cycling. Marguerite Bay, located on the WAP, is considered a 'high recycling, low export' region with blooms dominated by large diatoms, low transfer efficiencies to deep water, and intensive remineralisation and grazing in the upper water-column. This project aims to use Fe and Si isotope geochemistry to investigate the main drivers that regulate export and recycling in Marguerite Bay.