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

本研究的主要目的是在CLIVAR重复水文（RH）计划的第二阶段收集和分析放射性碳（P14PC）和稳定碳（P13PC, P12PC）同位素。这项研究将集中在大西洋。样本将在未来6年内从所有计划的RH大西洋邮轮中收集和分析，另外还将从4个非美国的重复邮轮中收集和分析。除了监测炸弹- p14pc瞬态变化外，整个计划采样将允许对大西洋的三维放射性碳分布进行更新估计。放射性碳采样将继续按15-20年的重复时间表进行，比国际CLIVAR每十年一次的重复采样要慢。放射性碳一直被认为是海洋过程研究的重要示踪剂。本研究产生的数据可用于研究混合、通风率、生产速率、在深海的停留时间、深海生物地球化学和氧气利用率、海气交换、温跃层通风率，作为海洋中人为cobb的代理，并评估海洋环流模型（OGCM）的性能。后一种应用尤其重要，因为我们依赖这些模型来预测全球cobb增加的后果。放射性碳和氟氯化碳在ogcm中的联合输入为模型提供了一个至关重要的测试，这是单独通过一种示踪剂无法获得的。这项研究没有为科学解释和任何形式的学生参与（高中生作为洗瓶子者除外）提供资金。因此，直接的更广泛的影响非常有限。一旦这些数据公开，特别是在它们被纳入大规模数据产品之后，预计其结果将对生物地球化学和物理海洋学领域产生重要和非常广泛的影响。这些数据将与所有可用来源的结果相结合，并将以易于使用的格式提供给整个国际社会。

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.