Collaborative Research: Autonomous Lagrangian Floats for Oxygen Minimum Zone Biogeochemistry

合作研究：用于最低氧区生物地球化学的自主拉格朗日浮子

• 批准号: 1154741
• 负责人: Mark Altabet
• 金额: $ 34.96万
• 依托单位: University of Massachusetts, Dartmouth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2016-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1154741&HistoricalAwards=false
• 关键词: Collaborative; Research; Autonomous; Lagrangian; Floats

Intense oxygen minimum zones (OMZ) of the world's oceans, though constituting a small fraction of total oceanic volume, host critical biogeochemical processes and are central to understanding the ocean's N cycle and its biogeochemical and isotopic signatures. OMZ's are sites for a large portion of marine combined N loss to N2 (25 to 50%) and dominate the ocean N isotope budget through cogeneration of 15N and 18O enriched NO3 -. Major outstanding issues include the magnitude of this N sink, the stoichiometry between NO3 - loss and the production of biogenic N2, the microbial pathways leading to N2 production, as well as the interaction between these OMZ processes and the surface export of organic matter as well as physical circulation. The PI's request funding to develop a new, in situ, autonomous tool for studying N loss in OMZ's. It will allow observation of variability over a range in temporal and spatial scales that are critical for understanding controlling processes and better estimating the magnitude of N-loss. The sustained deployments possible with autonomous platforms will be critical for detecting any response of OMZ's to climate change.Broader Impacts: Nitrogen is often the limiting nutrient for biological production in the oceans, and the current global marine nitrogen balance has been in much debate due to a number of uncertainties and questions. A successful development of this proposed sensor-float package may help in resolving some of the important questions on the spatial and temporal variabilities of the OMZs. In turn, such knowledge is essential in assessing the global nitrogen balance in the current and future oceans. This proposed project would involve active participation of undergraduates, graduates and postdocs, as well as the training of a K-12 science teacher. This project would also foster collaboration with international researchers. The PI's have partnered with Ocean Explorium at New Bedford Seaport to provide an educational outreach component designed to aid teacher development and create a field trip program for teachers in the south coast of Massachusetts. The proposal will support post-doc, graduate and undergraduate students.

世界海洋的强烈氧最小区（OMZ）虽然构成了总海洋量的一小部分，但具有关键的生物地球化学过程，对于理解海洋的N周期及其生物地球化学和同位素签名至关重要。 OMZ是大部分海洋的地点，合并N 2（25％至50％），并通过15n和18o富集No3-的高温和18O的高素质预算主导了海洋N同位素预算。重大问题的主要问题包括该氮水槽的大小，NO3损失与生物N2的产生之间的化学计量，导致N2产生的微生物途径以及这些OMZ过程与有机物的表面出口之间的相互作用以及物理循环。 PI要求资金开发一种新的原位自主工具，用于研究OMZ的N损失。它将允许在时间和空间尺度的范围内观察可变性，这对于理解控制过程和更好地估计N损失的幅度至关重要。使用自主平台可能持续的部署对于检测OMZ对气候变化的任何反应至关重要。Boader的影响：氮通常是海洋生物生产的限制营养素，并且由于许多不认真和问题，当前的全球海洋氮平衡引起了很多争议。该提出的传感器流动包装的成功开发可能有助于解决有关OMZ的空间和时间变化的一些重要问题。反过来，这种知识对于评估当前和未来海洋中的全球氮平衡至关重要。这个拟议的项目将涉及本科生，毕业生和博士后的积极参与，以及K-12科学老师的培训。该项目还将促进与国际研究人员的合作。 PI已与New Bedford Seaport的Ocean Explorium合作，提供了一个教育外展组成部分，旨在帮助教师开发并为马萨诸塞州南部海岸的教师创建实地考察计划。该提案将支持新学位，研究生和本科生。