An Integrated Molecular and Isotopic Approach to Assess Organc Sources and Carbon Sequestration over the Holocene Arctic Ocean

这项工作的重点是碳循环，其与气候变率的联系反映在到达沉积物的有机来源的平衡中，并最终与沉积物层的同位素特征和年龄结构一起保存下来。这项工作是基于这样的假设，即西北冰洋在全新世以来经历了初级生产力和陆地碳输送的周期性变化，这反映在现有的有机碳结构中，并保留了它们的同位素特征。与德国同事进行样品交换和分析，可以与欧亚北极地区进行比较，以获得碳年龄和保存的泛北极视角。该研究将提供全新世北冰洋碳输入和保存的重要信息，这是理解现代碳循环和预测北极沉积盆地在不同气候情景下碳封存作用的核心需求。重点将放在北极西部，通过河流输入与水文系统建立联系，并利用最近收集的重要全新世序列。包括通过国际合作进行样本交换和比较措施，以提供关于北极盆地碳转移和保存的泛北极视角。参与本提案的研究人员将参与本科生和研究生的培训和教育，其中包括本科生和教师的外展活动。该项目还包括在当地一所大学进行实时、互动的远程教育项目，以及对博士生的跨学科培训，以及通过暑期实习项目让本科生参与其中。公众外展将通过研究人员所在大学的广泛传播（Web）和以当地为重点的倡议来完成。

P.I.: H. Rodger Harvey Proposal Number: 0612580The focus of this work is on the carbon cycle whose linkage to climate variability is reflected in the balance of organic sources which arrive at sediments, and are ultimately preserved together with the isotopic signature and age structure of the sediment horizons. The work is based on the hypothesis that the western Arctic Ocean has undergone cyclical changes in primary productivity and delivery of terrestrial carbon over the Holocene, which are reflected in the organic carbon structure present and with their isotopic signatures preserved. Sample exchange and analysis with German colleagues will allow comparisons with the Eurasian Arctic for a pan-Arctic perspective of carbon age and preservation. The study will provide important information on the inputs and preservation of carbon over the Holocene Arctic Ocean, a central need for understanding the modern carbon cycle and forecasting the role of the Arctic sedimentary basin in carbon sequestration under variable climate scenarios. The focus will be on the western Arctic, which allows linkages to the hydrologic system through riverine input and takes advantage of recent collections of important Holocene sequences. Included are sample exchange and comparative measures through international collaborations to provide a pan-Arctic perspective on the transfer and preservation of carbon over the Arctic Basin. The researchers participating in this proposal will take part in undergraduate and graduate student training and education, which includes outreach activities for undergraduates and teachers. This project also includes a real-time, interactive teleducation program at a local university, as well as interdisciplinary training of doctoral students, and participation of undergraduates through summer intern programs. Public outreach will be accomplished via broadly disseminated (Web) and locally focused initiatives at the researchers' universities.