Collaborative Research: Collection and Analysis of Radiocarbon Samples on Repeat Hydrography Lines

这项研究的主要目标是收集和分析CLIVAR重复水文记录(RH)计划第二阶段的放射性碳(P14PC)和稳定碳(P13PC，P12PC)同位素。这项研究将集中在大西洋上。样本将从未来6年计划中的所有RH大西洋邮轮以及另外4个非美国重复邮轮收集和分析。除了监测Bomb-P14PC瞬变的变化外，计划中的总采样还将允许更新大西洋3-D放射性碳分布的估计。放射性碳的采样将持续15-20年的重复计划，慢于国际CLIVAR每十年一次的重复采样。长期以来，放射性碳一直被认为是研究海洋过程的重要示踪剂。这项研究产生的数据可用于研究混合、通风率、生产率、深海停留时间、深海生物地球化学和氧气利用率、气-海气体交换、温跃层通气率，作为海洋中人为COB2B的替代指标，并评估海洋大气环流模式(OGCM)的性能。后一种应用尤其重要，因为我们依赖这样的模型来预测全球COB2B增加的后果。放射性碳和氯氟化碳的组合输入OGCMS提供了对仅靠一种示踪剂无法获得的模型的至关重要的测试。这项研究没有为科学解释提供资金，也没有为学生参与任何形式的活动提供资金(高中生作为洗瓶者除外)。因此，直接的更广泛的影响非常有限。一旦这些数据公之于众，特别是在它们被纳入大规模数据产品之后，其结果预计将对生物地球化学和海洋物理领域产生重要和非常广泛的影响。这些数据将与来自所有现有来源的结果结合起来，并将以易于使用的格式向整个全球社区提供。

The major objective of this study is to collect and analyze both radiocarbon (P14PC) and stable carbon (P13PC, P12PC) isotopes during the second phase of the CLIVAR Repeat Hydrography (RH) program. The study will be focused on the Atlantic Ocean. Samples will be collected and analyzed from all of the planned RH Atlantic cruises over the next 6 years and additionally from 4 non-US repeat cruises. The total planned sampling will allow an updated estimate of the 3-D radiocarbon distribution for the Atlantic in addition to monitoring changes in the bomb-P14PC transient. Sampling for radiocarbon will continue on a repeat schedule of 15-20 years, slower than the international CLIVAR repeat sampling of once per decade. Radiocarbon has long been recognized as an important tracer for studies of ocean processes. Data generated from this study can be used to study mixing, ventilation rates, production rates, residence times in the deep ocean, deep ocean biogeochemistry and oxygen use rates, air-sea gas exchange, thermocline ventilation rates, as a proxy for anthropogenic COB2B in the ocean, and to evaluate ocean general circulation model (OGCM) performance. The latter application is particularly important based on our reliance on such models to predict the consequences of increased global COB2B. The combined input of radiocarbon and CFCs into OGCMs provides a critically important test of the models that cannot be gained through one tracer alone. The study includes no funding for scientific interpretation nor for student participation of any kind (with the exception of high school students as bottle washers). Consequently, the immediate broader impacts are very limited. Once the data are public and especially after they have been incorporated into large scale data products the results are expected to have important and very wide impact on both the biogeochemical and physical oceanographic fields. The data will be combined with results from all available sources and will be available to the entire global community in easy to use formats.