OCE PRF Track 2 (International): Tracking mesopelagic carbon flux and particle size on a multi-ocean scale using a fleet of bio-optical profiling floats

有机碳通过中远洋（100-1000米）的下沉是大气二氧化碳的重要长期汇，也是深海和底栖生态系统的碳源。该项目的研究成果将对碳通量科学做出重大贡献，这对改善气候预测和了解深层生态系统都很重要。该项目已提交给海洋科学博士后研究奖学金计划，将进一步发展一个有前途的科学家的职业生涯。鉴于研究中大洋碳通量的全球性，该研究员由herv<s:1> Claustre主持，在法国维尔弗朗什海洋实验室（LOV）开展强有力的国际合作，以增进对这一国际重要课题的理解。该奖项得到了国际和综合活动办公室的资助。温带和亚极地浮游植物大量繁殖造成了大量中上层碳通量。由于气候变化，中上层通量格局在未来可能发生重大变化，可能造成气候反馈和/或威胁深层生态系统。目前用于测量介层通量的技术在后勤上具有挑战性，涉及物理样品的检索。由于采样尺度和方法不同，目前的方法也难以进行比较。在这个项目中，该研究员将通过将其在研究生学习期间开发的新方法应用于大型“Bio-Argo”漂浮数据集，增加高纬度浮游植物繁殖期间中上层通量测量的覆盖率。这个项目产生的通量数据集将对科学界大有裨益，除了使用传统方法进行密集的、特定区域的通量研究外，还可以对全球格局进行广泛的分析。通过确定通量及其驱动因素的大尺度模式，这项工作将增加对所研究区域的了解，并帮助卫星海洋学家和建模者测试和改进通量产品。此外，随着Bio-Argo船队扩展成一个永久性的全球网络，这项工作将成为一个更大项目的开始：一个全球的原位通量记录。因此，在该项目分析过程中获得的方法经验教训将为未来的抽样策略和验证工作提供信息，有助于确保这一全球记录的质量。

The sinking of organic carbon through the mesopelagic ocean (100-1000 meters) represents an important long-term sink for atmospheric carbon dioxide and a carbon source for deep-sea and benthic ecosystems. Research results from this project will make a significant contribution to the science of carbon flux, which is important both for improving climate projections and understanding deep ecosystems. The project was submitted to the Ocean Sciences Postdoctoral Research Fellowship program and will further the career of a promising scientist. Given the global nature of studying carbon flux in the mesopelagic, the fellow is being hosted by Hervé Claustre at the Laboratoire d'Oceanographie de Villefranche(LOV) in France and building strong international collaborations to improve understanding on this internationally important topic. This award was supported with funding from the Office of International and Integrative Activities.Temperate and subpolar phytoplankton blooms account for large amounts of mesopelagic carbon flux. Mesopelagic flux patterns may change considerably in the future due to climate change, potentially causing climate feedbacks and/or threatening deep ecosystems. Current technologies for measuring mesopelagic flux are logistically challenging, involving the retrieval of physical samples. Current methods are also difficult to compare, due to differing sampling scales and methods. In this project, the fellow will increase coverage of mesopelagic flux measurements during high-latitude phytoplankton blooms by applying novel methods the fellow developed during graduate studies to a large "Bio-Argo" float dataset. The flux dataset produced as a result of this project will be of great benefit to the scientific community, allowing broad analysis of global patterns in addition to the intensive, region-specific flux studies undertaken using traditional methods. By identifying broad-scale patterns in flux and their drivers, this work will increase knowledge of the regions studied and help satellite oceanographers and modelers test and improve flux products. Furthermore, as the Bio-Argo fleet expands to form a permanent, global network, this work will form the start of something bigger: a global, in situ flux record. As such, methodological lessons learned during analysis of this project will inform future sampling strategies and validation efforts, helping to ensure the quality of this global record.