Collaborative Research: Characterizing The Evolving Oceanic Radiocarbon Distribution: Sampling and Analysis During GO-SHIP and Ships of Opportunity Cruises

合作研究：描述不断变化的海洋放射性碳分布：GO-SHIP 和机会邮轮期间的采样和分析

• 批准号: 2046475
• 负责人: Roberta Hansman
• 金额: $ 63.65万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-02-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2046475&HistoricalAwards=false
• 关键词: Collaborative; Research; Characterizing; Evolving; Oceanic

This project supports the global measurement of carbon isotope tracers as part of the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP). The US component of GO-SHIP typically occupies 2 or 3 major oceanic hydrographic sections per year. The team will sample a subset of these to determine changes in 14C and 13C of dissolved inorganic carbon (DIC). These data provide key metrics for climate and earth-system models and can be used by the broader research community for a diverse set of scientific applications, such as climate model development and calibration. Both institutions will also endeavor to engage postdoctoral researchers supported under separate funding, contributing to the training of the next generation of scientists.Carbon isotopic data affords key insights into ocean processes that are not available from any other measurements: 14C provides high signal/noise quantification of decadal-scale penetration of anthropogenic perturbation through the bottom of the thermocline and into the deep sea. It also provides key insights into the global overturning circulation by documenting return flow of Southern Ocean intermediate waters to the sea surface. Delta 14C is critical to quantifying the air-sea CO2 gas exchange rate. For 13C, the air-sea 13C disequilibrium is readily measured, thus quantifying the uptake of the anthropogenic CO2 perturbation at the sea surface. When combined with the accumulation of anthropogenic 13C changes in the ocean interior, it is possible to quantify basin-scale redistribution of anthropogenic CO2 in the ocean interior from observations alone. These processes are difficult, if not impossible to examine with synthetic anthropogenic tracers like Chlorofluorocarbon and with conventional C system measurements. The availability of carbon isotope data will aid a wide range of studies including climate change, oceanic anthropogenic CO2, thermocline ventilation, thermohaline overturning rates, air-sea gas exchange rates, biological cycling rates, and model evaluation or calibration. As GO-SHIP cruise schedules are planned, the team will carefully evaluate which legs would yield the best science return from the limited analytical capacity. Sampling will likely focus on long, meridional sections in the Atlantic and Pacific oceans where a strong signal is anticipated, and on any other areas where measurements have been lacking. The water samples will be transported to the National Ocean Sciences Accelerator Mass Spectrometry facility (NOSAMS) for analysis. The sampling design, final quality control, and submission of the data to the CLIVAR and Carbon Hydrographic Data Office (CCHDO) and to the Ocean Carbon Data System (OCADS) will be performed at the University of Washington.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目支持碳同位素示踪剂的全球测量，作为全球海洋船舶水文调查计划 (GO-SHIP) 的一部分。 GO-SHIP 的美国部分通常每年占据 2 或 3 个主要海洋水文剖面。该团队将对其中的一部分进行采样，以确定溶解无机碳 (DIC) 的 14C 和 13C 的变化。这些数据为气候和地球系统模型提供了关键指标，可供更广泛的研究界用于各种科学应用，例如气候模型开发和校准。两个机构还将努力聘请在单独资助下支持的博士后研究人员，为下一代科学家的培训做出贡献。碳同位素数据提供了任何其他测量所无法提供的海洋过程的关键见解：14C提供了高信号/噪声量化十年尺度的人为扰动穿过温跃层底部并进入深海。它还通过记录南大洋中间水域返回海面的流量，提供对全球翻转环流的重要见解。 Delta 14C 对于量化海气二氧化碳气体交换率至关重要。对于 13C，气海 13C 不平衡很容易测量，从而量化海面人为 CO2 扰动的吸收。当与海洋内部人为 13C 变化的积累相结合时，可以仅通过观测来量化海洋内部人为 CO2 的盆地规模重新分布。使用合成的人为示踪剂（如氯氟烃）和传统的 C 系统测量来检查这些过程即使不是不可能，也是很困难的。碳同位素数据的可用性将有助于广泛的研究，包括气候变化、海洋人为二氧化碳、温跃层通风、温盐翻转率、空气-海洋气体交换率、生物循环率以及模型评估或校准。在规划 GO-SHIP 巡航时间表时，团队将仔细评估哪些航段能够从有限的分析能力中产生最佳的科学回报。采样可能会集中在预计会出现强信号的大西洋和太平洋的长经向区域，以及缺乏测量的任何其他区域。水样将被运送到国家海洋科学加速器质谱设施（NOSAMS）进行分析。采样设计、最终质量控制以及向 CLIVAR 和碳水道测量数据办公室 (CCHDO) 以及海洋碳数据系统 (OCADS) 提交数据将在华盛顿大学进行。该奖项反映了 NSF 的法定使命和通过使用基金会的智力优点和更广泛的影响审查标准进行评估，该项目被认为值得支持。

项目成果

COMPARABILITY OF RADIOCARBON MEASUREMENTS IN DISSOLVED INORGANIC CARBON OF SEAWATER PRODUCED AT ETH-ZURICH

苏黎世联邦理工学院生产的海水中溶解无机碳的放射性碳测量结果的可比性

• DOI: 10.1017/rdc.2023.16
• 发表时间: 2023
• 期刊: Radiocarbon
• 影响因子: 8.3
• 作者: Castrillejo, Maxi;Hansman, Roberta L;Graven, Heather D;Lester, Joanna G;Bollhalder, Silvia;Kündig, Kayley;Wacker, Lukas
• 通讯作者: Wacker, Lukas