Integrating and ground truthing the profiling float microrosette

集成和地面实况分析浮子微玫瑰花结

• 批准号: 1538580
• 负责人: Todd Martz
• 金额: $ 50.44万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-10-01 至 2021-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1538580&HistoricalAwards=false
• 关键词: Integrating; ground; truthing; profiling; float

The autonomous profiling float platform provides 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. The development of new chemical sensors for measurement of CO2 dissolved in the ocean will improve our ability to quantify globally significant biogeochemical processes such as annual net community production in the ocean; and, in addition, the process of ocean acidification which is considered to be one of the most significant anthropogenic threats to the marine ecosystem. This research will develop a new technology known as the Micro-Rosette which will ultimately contribute a new tool to the short list of sensors available for integration into autonomous profiling floats.The Micro-Rosette is a device intended to operate specifically on board a profiling float. The system captures sub-milliliter volumes of seawater at pre-determined depths, stores the samples for a period of time, analyzes all of the discrete seawater samples ex situ (at the park depth), ejects them, and then repeats the cycle. When combined with a typical profiling float cycle, this approach adapts to the float's ascent/decent/park cycle, taking advantage of the multi-day park cycle to perform all of the chemical analyses. Determination of dissolved inorganic carbon is accomplished through acidification of the seawater sample, equilibration across a gas-permeable membrane, and quantification via a conductivity measurement. The Micro Rosette is purposefully built for profiling floats, and by taking advantage of the extended park cycle to carry out chemical analyses, this approach embraces the fact that many chemical analysis techniques require a time-dependent reaction or diffusion step leading to response times that make such analyses poorly suited for on-the-fly measurements. The application of this research is the measurement of total dissolved inorganic carbon, but the concept of a micro-rosette system is well-suited to several other types of analyses such as ammonia, organic carbon, and iron, and may potentially lead to a new family of profiling-float-ready wet chemical analyzers.

自主剖面浮标平台为海洋观测提供了相对于船舶的数量级改进的潜力。研究海洋热量收支和大规模混合过程的物理海洋学家已经认识到了这一事实，现在海洋生物地球化学和生态模型界的势头正在增强。开发用于测量溶解在海洋中的二氧化碳的新的化学传感器将提高我们量化全球重大生物地球化学过程的能力，例如每年海洋中的净群落生产；此外，海洋酸化过程被认为是对海洋生态系统最重大的人为威胁之一。这项研究将开发一种名为微型玫瑰花的新技术，它最终将为可用于集成到自主剖面浮标中的传感器提供一个新的工具。微型玫瑰花是一种专门在剖面浮标上操作的设备。该系统在预定深度捕获亚毫升体积的海水，将样本存储一段时间，对所有离散的海水样本进行异地分析(在公园深度)，将其排出，然后重复该循环。当与典型的分析浮标周期相结合时，这种方法适应浮标的上升/体面/停放周期，利用多天的停放周期来执行所有的化学分析。溶解无机碳的测定是通过海水样品的酸化、在透气膜上的平衡以及通过电导率测量来定量来完成的。微型玫瑰花是专门为分析浮标而建造的，通过利用延长的公园周期进行化学分析，这种方法接受了这样一个事实，即许多化学分析技术需要依赖时间的反应或扩散步骤，从而导致响应时间，这使得这种分析不太适合实时测量。这项研究的应用是总溶解无机碳的测量，但微玫瑰花环系统的概念非常适合于其他几种类型的分析，如氨、有机碳和铁，并可能导致一种新的分析浮法准备的湿式化学分析仪系列。