US GEOTRACES N. Atlantic: Measuring the δ13C-DIC distribution and quantifying the impact of organic matter export on δ13C, nutrients and biologically active trace

美国 GEOTRACES 北大西洋：测量

• 批准号: 0926213
• 负责人: Paul Quay
• 金额: $ 38.51万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2012-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0926213&HistoricalAwards=false
• 关键词: US; GEOTRACES; N.; Atlantic; Measuring

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).In this project, researchers at the University of Washington will address two of the overriding goals of the GEOTRACES program: advancing our understanding of the processes that control trace element distributions in the ocean, and understanding the processes that control the concentrations of geochemical species used for proxies of the past ocean environment. The overall goal is to improve our ability to use trace element and del13C proxies as indicators of past changes in ocean circulation and carbon cycling. The research has three components: (1) to measure the 13C/12C of the dissolved inorganic carbon (DIC) during the GEOTRACES cruise in the North Atlantic Ocean; (2) to estimate the rate of organic matter (OM) export from the surface layer; and (3) to quantify the impact that air-sea CO2 gas exchange, OM export, remineralization and circulation have on the modern distributions of bioactive trace elements, del 13C-DIC and nutrients in the Atlantic Ocean. Del13C-DIC will be measured at all stations for a total of ca. 600 samples with particular emphasis on improving the sampling coverage in intermediate waters and deep sea. Additionally, the team will measure the dissolved O2/Ar gas ratio in the surface layer using discrete and underway measurements. The rates of OM export will be determined using two approaches. The first method relies on the air-sea disequilibrium of the ä13C-DIC; the second method relies on the air-sea disequilibrium of the dissolved oxygen gas. Air-sea gas exchange rates will be estimated from satellite-based wind speeds. The goal of this part of the project is to improve our understanding of the impact of OM export on bioactive trace elements. Broader Impacts. This project is part of an international scientific program (GEOTRACES) and, thus, the data and research results will be broadly distributed to the international oceanographic community. Additionally, the results will be incorporated into the principal investigator's teaching curricula, specifically in an undergraduate course entitled Climatic Extremes and graduate course entitled Isotope Biogeochemistry. Third, there will be active undergraduate participation in preparing samples for del13C-DIC analyses during this project. Lastly, there are clear societal benefits from the GEOTRACES program goals that will improve predictions of future climate change under increasing atmospheric CO2 levels.

该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。在该项目中，华盛顿大学的研究人员将解决 GEOTRACES 计划的两个首要目标：增进我们对以下过程的理解：控制海洋中的微量元素分布，并了解控制用于代表过去海洋环境的地球化学物质浓度的过程，总体目标是提高我们使用微量元素和 del13C 的能力。该研究由三个部分组成：(1) 测量北大西洋 GEOTRACES 航行期间溶解的无机碳 (DIC) 的 13C/12C；估计表层有机质 (OM) 输出率；(3) 量化海气 CO2 气体交换、OM 输出、再矿化和循环对生物活性微量现代分布的影响大西洋中的元素、del 13C-DIC 和营养物将在所有站测量总共约 600 个样本，特别注重提高中层水域和深海的采样覆盖率。使用离散和持续测量来测量表层溶解的 O2/Ar 气体比率。第一种方法依赖于海气不平衡。 ä13C-DIC；第二种方法依赖于溶解氧气的海气不平衡，该方法将根据基于卫星的风速来估计。 OM 出口对生物活性微量元素的影响。该项目是国际科学计划 (GEOTRACES) 的一部分，因此，数据和研究结果将广泛分发给国际海洋学界。将纳入首席研究员的教学课程，特别是题为“极端气候”的本科生课程和题为“同位素生物地球化学”的研究生课程。第三，在该项目期间，本科生将积极参与准备 del13C-DIC 分析的样品。 GEOTRACES 计划目标将带来社会效益，这些目标将改善对大气二氧化碳水平不断增加的情况下未来气候变化的预测。