Development of a Micro-Rosette Sensor for Total Dissolved Inorganic Carbon Measurement from Autonomous Lagrangian Ocean Profilers

与船只相比，剖面浮标阵列为海洋观测提供了数量级改进的潜力。研究海洋热收支和大规模混合过程的物理海洋学家已经认识到这一事实，并且现在在海洋生物地球化学和生态建模社区中获得了动力。到目前为止，将现成的CO2系统传感器添加到剖面浮子上的尝试是无效的，因为这些设备并没有明确的意图在剖面仪上运行，而且因为目前可用的传感器仅限于pCO2测量，由于pCO2对温度和压力高度敏感，响应时间慢，需要在深度间隔长时间停留以达到平衡，并且不容易在非原位测量。因此，目前没有技术可用于有意义的观察无机碳系统的剖面浮子。本提案中概述的微玫瑰结方法将首次允许从剖面浮子中提取溶解无机碳的剖面。PI要求资助建立和测试一个新概念：“微型玫瑰结”，部署在argo型剖面浮标上。微型玫瑰结是一种专门用于分析浮子的设备，在浮子上升过程中捕获离散的海水样本，并将其存储起来，供后续化学分析使用。我们在这里关注的应用是测量总溶解无机碳，CT。这将产生第一个自主的、拉格朗日的CT垂直剖面。实现一个工作原型微玫瑰包括一个工程组件，以开发一个低功耗的旋转木马式装置，以及一个化学组件，负责修改和微调一个经过验证的流动注射分析方法。一个成功的项目将产生第一个自主的，在2000米以上的拉格朗日CT垂直剖面，这标志着开发新一代工具的重要一步，这些工具可以更好地了解海洋中碳的年循环，并提供对海洋酸化的直接观测。该项目支持在美国/爱尔兰研发合作计划下提高美国、爱尔兰和北爱尔兰研究人员之间的合作水平。这三个合作伙伴都将从各自的国家科学资助机构获得专门的资助。这项工作是多学科的，汇集了海洋生物地球化学（Martz，美国）、海洋物理学（Ward，爱尔兰）和微流体工程（Maguire和McLaughlin，北爱尔兰）的专业知识。更广泛的影响：已确定的更广泛的影响包括改善评估海洋无机碳循环当前和未来变化的数据数量，以及将其应用于其他分析物的巨大潜力。在美国/爱尔兰研发合作计划下，美国、爱尔兰和北爱尔兰的研究人员之间的合作也必须被视为具有更广泛的影响。这三个合作伙伴都将从各自的国家科学资助机构获得专门的资助。努力是多方面的？汇集了海洋生物地球化学（Martz， US）、海洋物理（Ward， IE）和微流体工程（Maguire and McLaughlin， NI）方面的专业知识。美国和爱尔兰部分包括支持一名全日制研究生，北爱尔兰部分将支持一名研究助理。

Arrays of profiling floats provide the potential for orders-of-magnitude improvement in ocean observing, relative to ships. This fact has already been realized by physical oceanographers studying the ocean heat budget and large-scale mixing processes and is now gaining momentum in the ocean biogeochemistry and ecological modeling communities. Attempts to add off-the-shelf sensors for the CO2 system to profiling floats has thus far been ineffectual because these devices were not built with the express intention of operating on profilers, and because the sensors available at present are limited to pCO2 measurements which require long dwelling times at depth intervals for equilibration due to slow response times as pCO2 is highly sensitive to temperature and pressure and cannot be easily measured ex-situ. Consequently, there is currently no technology available for meaningful observations of the inorganic carbon system from profiling floats. The micro-rosette approach outlined in this proposal will allow, for the first time, profiles of dissolved inorganic carbon from profiling floats.The PI's request funding to build and test a new concept: a "micro-rosette" to be deployed on an ARGO-type profiling float. The micro-rosette is a device intended to operate specifically on board a profiling float, capturing discrete seawater samples during float ascent and storing them for subsequent chemical analysis. The application that we focus on here is the measurement of total dissolved inorganic carbon, CT. This will result in the first autonomous, Lagrangian vertical profiles of CT. Realizing a working prototype micro-rosette involves an engineering component in order to develop a low power carousel-type device in addition to a chemistry componentresponsible for modification and fine-tuning of a proven flow injection analysis method. A successful project will result in the first autonomous, Lagrangian vertical profiles of CT in the upper 2000 m, marking a major step in development of a new generation of tools necessary to better understand annual cycles of carbon in the ocean in addition providing direct observations of ocean acidification over large areas of the ocean.This project supports an increase in the level of collaboration between researchers in the US, Ireland, and Northern Ireland under the US/Ireland R&D Partnership Program. Each of the three partners will receive funding exclusively from their respective national science funding agencies. The effort is multi-disciplinary, and brings together expertise in ocean biogeochemistry (Martz, US), ocean physics (Ward, Ireland) and microfluidics engineering (Maguire and McLaughlin, Northern Ireland).Broader Impacts: The identified broader impacts included improving the quantity of data for evaluating present and future changes in the ocean inorganic carbon cycle and the great potential for application to other analytes. The collaboration between researchers in the US, Ireland, and Northern Ireland under the US/Ireland R&D Partnership Program must also be considered a broader impact. Each of the three partners will receive funding exclusively from their respective national science funding agencies. The effort is multi?disciplinary, and brings together expertise in ocean biogeochemistry (Martz, US), ocean physics (Ward, IE) and microfluidics engineering (Maguire and McLaughlin, NI). The US and Ireland portions includes support for a full time graduate student, the Northern Ireland portion will support a research associate.