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

该奖项是根据2009年美国复苏和再投资法案资助的（公法111-5）。在这个项目中，华盛顿大学的研究人员将解决GEOTRACES计划的两个首要目标：推进我们对控制海洋中微量元素分布的过程的理解，并了解控制地球化学物种浓度的过程，这些物种被用作过去海洋环境的替代物。 总体目标是提高我们使用微量元素和del 13 C替代物作为海洋环流和碳循环过去变化指标的能力。研究内容包括三个方面：（1）测量GEOTRACES在北大西洋航行期间溶解无机碳（DIC）的~（13）C/~（12）C值，（2）估算表层有机质（OM）输出速率，（3）估算表层有机质输出速率，（4）估算表层有机质输出速率。（3）量化海气CO2气体交换、有机质输出海水化和环流对大西洋生物活性微量元素、del 13 C-DIC和营养盐的现代分布有影响。将在所有站点测量Del 13 C-DIC，总计约600个样本，特别强调扩大在中层沃茨和深海的采样范围。此外，该团队将使用离散和正在进行的测量来测量表层中溶解的O2/Ar气体比率。将采用两种方法确定有机物出口率。第一种方法依赖于a13 C-DIC的海气不平衡;第二种方法依赖于溶解氧气体的海气不平衡。海气交换率将根据卫星风速估算。该项目的这一部分的目标是提高我们对OM出口对生物活性微量元素的影响的理解。更广泛的影响。 该项目是国际科学计划（GEOTRACES）的一部分，因此数据和研究成果将广泛分发给国际海洋学界。此外，研究结果将纳入主要研究员的教学课程，特别是题为“极端气候”的本科课程和题为“同位素生物地球化学”的研究生课程。第三，在本项目期间，将有积极的本科生参与准备del 13 C-DIC分析的样本。最后，GEOTRACES计划的目标有明显的社会效益，这将改善对大气CO2水平增加下未来气候变化的预测。

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.