US GEOTRACES ARCTIC: Measuring stable isotopes of carbon in dissolved inorganic carbon and oxygen/argon gas ratios to show impact of organic matter export on nutrient distributions

US GEOTRACES ARCTIC：测量溶解的无机碳中碳的稳定同位素和氧气/氩气比率，以显示有机物输出对营养物分布的影响

• 批准号: 1433349
• 负责人: Paul Quay
• 金额: $ 41.49万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1433349&HistoricalAwards=false
• 关键词: US; GEOTRACES; ARCTIC; Measuring; stable

A scientist from the University of Washington will participate in the 2015 U.S. GEOTRACES Arctic Ocean cruise and measure the vertical distribution of the stable isotopes of carbon found in dissolved inorganic carbon (del13C), a tracer of biogeochemical cycling. In addition, he will determine the spatial variation in the ratio of oxygen gas to argon gas (O2/Ar) in surface water samples because this ratio can be used as a proxy for organic matter export. In common with other multinational initiatives in the International GEOTRACES Program, the goals of the U.S. Arctic expedition are to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. Some trace elements are essential to life, others are known biological toxins, and still others are important because they can be used as tracers of a variety of physical, chemical, and biological processes in the sea. Results from this study will further our understanding of the processes that control observed trace elements, nutrients, and the stable carbon isotopes in dissolved inorganic carbon in the present day ocean and use this information to gain information on past changes in ocean circulation on carbon cycling. This project will also provide training opportunities for undergraduate students, and results will be integrated into public outreach activities and material for class lectures.A better understanding of the impact of physical and biological processes on the distribution of nutrient and trace elements in the modern ocean is critical to our interpretation of future changes in their distributions in the Arctic and their utility as proxies of circulation and biological pump conditions in the historic ocean. One key parameter needed to understand these processes is del13C of dissolved inorganic carbon, for which little to no data currently exists in the Arctic Ocean. This study will aim to measure the depth distribution of the del13C of dissolved inorganic carbon and the dissolved O2/Ar ratio in the surface layer of the ocean. These measurements will help to quantify the contributions of chemical processes and the biological pump on the spatial distribution of nutrients, trace elements, and del13C, as well as estimate organic matter export rates from the surface ocean.

华盛顿大学的一名科学家将参加 2015 年美国 GEOTRACES 北冰洋巡航，测量溶解无机碳 (del13C) 中碳稳定同位素的垂直分布，这是生物地球化学循环的示踪剂。 此外，他还将确定地表水样品中氧气与氩气比例 (O2/Ar) 的空间变化，因为该比例可以用作有机物输出的代理。 与国际地理追踪计划中的其他多国倡议一样，美国北极探险的目标是识别控制海洋中关键微量元素和同位素分布的过程和量化通量，并确定这些分布对变化的敏感性。环境条件。有些微量元素是生命所必需的，有些是已知的生物毒素，还有一些很重要，因为它们可以用作海洋中各种物理、化学和生物过程的示踪剂。这项研究的结果将进一步了解控制当今海洋中溶解的无机碳中所观察到的微量元素、营养物和稳定碳同位素的过程，并利用这些信息来获取过去海洋环流对碳循环的变化的信息。 该项目还将为本科生提供培训机会，其成果将被纳入公共宣传活动和课堂讲座材料中。更好地了解物理和生物过程对现代海洋中营养物和微量元素分布的影响对于我们解释它们在北极的分布的未来变化以及它们作为历史海洋中的环流和生物泵条件的代表的效用至关重要。了解这些过程所需的一个关键参数是溶解无机碳的 del13C，目前北冰洋几乎没有相关数据。本研究旨在测量海洋表层溶解无机碳的 del13C 深度分布和溶解的 O2/Ar 比。这些测量将有助于量化化学过程和生物泵对营养物、微量元素和del13C空间分布的贡献，并估计来自表层海洋的有机物输出率。