A sulfur hexafluoride section in the North Pacific Ocean: Application of a dual tracer approach

北太平洋的六氟化硫剖面：双示踪剂方法的应用

• 批准号: 0825095
• 负责人: Rolf Sonnerup
• 金额: $ 28.21万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-15 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825095&HistoricalAwards=false
• 关键词: sulfur; hexafluoride; section; North; Pacific

The North Pacific Ocean plays an important role in the uptake and storage of anthropogenic CO2. According to past research using chemical tracers, the North Pacific Ocean has been identified as a critical region where climate variability is causing changes in oceanic CO2 ventilation rates. Chemical tracers used in previous research, have resulted in data describing only a portion of CO2 transit timescales and were strongly affected by oceanic mixing. To enhance the use of tracer results, two ocean chemists from the University of Washington plan to utilize dual chemical tracers to provide more accurate determinations of thermocline ventilation, oxygen utilization, and anthropogenic CO2 uptake rates. By combining the use of chlorofluorocarbons (CFCs) and sulfur hexafluoride (SF6) as the tracers in a dual tracer approach, the results from this research would refine CO2 transit time distributions (TTD) and implicitly account for ocean mixing while calculating more accurate CO2 ventilation rates. The estimations of these acidification and ventilation rates are of significance to the understanding of the implications of global climate change including anthropogenic CO2 uptake by the oceans, ocean acidification, biological export rates, and decadal climate variability.As regards broader impacts, one graduate student would be supported and trained as part of this project. One undergraduate student would participate in the cruise, learn how to measure trace gases, and the data would provide the basis for his/her undergraduate research project.

北太平洋在吸收和储存人为CO2方面发挥着重要作用。根据过去使用化学示踪剂的研究，北太平洋已被确定为气候变化导致海洋CO2通风率变化的关键区域。在以前的研究中使用的化学示踪剂，导致数据描述的CO2过境时间尺度的一部分，并受到海洋混合的强烈影响。为了加强示踪结果的使用，来自华盛顿大学的两名海洋化学家计划利用双重化学示踪剂来提供更准确的温跃层通风，氧气利用率和人为CO2吸收率的测定。通过结合使用氯氟烃（CFCs）和六氟化硫（SF6）作为示踪剂的双重示踪剂的方法，从这项研究的结果将细化CO2渡越时间分布（TTD）和隐含的海洋混合，同时计算更准确的CO2通风率。对这些酸化和通风率的估计对于理解全球气候变化的影响具有重要意义，包括海洋人为CO2吸收、海洋酸化、生物输出率和十年气候变率。 一名本科生将参加巡航，学习如何测量痕量气体，数据将为他/她的本科研究项目提供基础。