Collaborative Research: Calibration of a new approach to reconstruct ancient bottom water oxygen levels

合作研究：重建古代底层水氧水平的新方法的校准

• 批准号: 1060992
• 负责人: Anthony Rathburn
• 金额: $ 15.56万
• 依托单位: Indiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1060992&HistoricalAwards=false
• 关键词: Collaborative; Research; Calibration; new; approach

Changes in dissolved oxygen availability strongly influence biological and geochemical processes in marine systems. However, marine oxygen concentrations often co-vary with other environmental factors, such as organic carbon flux, confounding paleoceanographic proxies for dissolved oxygen concentration in most deep-sea settings. This collaborative project, involving researchers and students from Indiana State University and Duke University, seeks to develop a proxy for bottom-water oxygen levels based on the shell morphology of benthic foraminifera. The research will include a sea-going expedition off San Diego, CA, to collect samples. The researchers will use Scanning Electron Microscopy (SEM) and image analysis tools for quantitative analysis of both archived and newly collected samples to calibrate the relationship between dissolved oxygen and pore densities of living epifaunal deep sea taxa. Specifically, they will determine: 1) how sensitive pore density is to small changes in oxygenation, 2) how pore characteristics change within and across obvious taxonomic boundaries, and 3) the range of dissolved oxygen that is best for each species. Funding supports students at both institutions, including their participation on the cruise. The research team will also develop a cruise blog that will be featured in an interactive exhibit at Indiana State University.

溶解的氧气可用性的变化强烈影响海洋系统中的生物学和地球化学过程。然而，海洋氧浓度通常与其他环境因素（例如有机碳通量，在大多数深海环境中溶解的氧气浓度）相混淆。这个合作项目涉及印第安纳州立大学和杜克大学的研究人员和学生，旨在根据底栖有孔虫的壳形态来开发底水氧水平的代理。这项研究将包括加利福尼亚州圣地亚哥附近的海探险，以收集样品。研究人员将使用扫描电子显微镜（SEM）和图像分析工具对存档和新收集的样品进行定量分析，以校准溶解的氧气与活的Epifaunal深海分类单元的溶解氧与孔密度之间的关系。具体而言，他们将确定：1）孔密度对氧合的小变化的敏感性如何，2）孔特性在明显的分类学边界内和跨越明显的分类学边界内的变化，以及3）最适合每个物种的溶解氧范围。资金支持这两个机构的学生，包括他们参加巡航。研究团队还将开发一个巡航博客，该博客将在印第安纳州立大学的互动展览中展出。