RAPID: Continuation of U.S. GEOTRACES North Atlantic Section: CFC and SF6 Measurements

RAPID：美国 GEOTRACES 北大西洋部分的延续：CFC 和 SF6 测量

• 批准号: 1132545
• 负责人: William Smethie
• 金额: $ 3.15万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1132545&HistoricalAwards=false
• 关键词: RAPID; Continuation; U.S.; GEOTRACES; North

The U.S. GEOTRACES North Atlantic campaign cruise was launched from Lisbon on the R/V/ Knorr in October, 2010. Unfortunately, in mid-course, a problem with the propulsion system developed, and the cruise had to be aborted. The Knorr went to a shipyard in Charleston, SC for repairs where scientific equipment and samples were offloaded there and shipped back to the various home institutions of the various scientists. This project addresses the efforts of one investigator originally funded through an ARRA award to participate in the North Atlantic campaign -- to resume a set of essential observations when the field program resumes in November, 2011. With support through a Grant for Rapid Response Research (RAPID), a research team at the Lamont-Dougherty earth Observatory will measure the CFC-11, CFC-12 and SF6 distributions along the autumn 2011 continuation of the previously aborted US GEOTRACES North Atlantic transect. They will use these data to identify the most recently ventilated cores of the North Atlantic water masses, to estimate transit times of these water masses from their source regions, and to estimate oxygen consumption rates and rates of production or decomposition of selected trace elements measured on this program using the transit time information. Such measurements are critically important to understanding how the physical processes of advection, mixing, and water mass formation affect the distributions of trace elements and isotopes in the ocean. The evolving CFC and SF6 distributions in the ocean provide strong constraints on these processes. Measurement of CFCs and SF6 on the GEOTRACES program places the GEOTRACES data in the context of large scale ventilation patterns established by CFC/SF6 measurements on these cruises. Broader Impacts. In addition to providing information on ventilation and transit times for the GEOTRACES project, the CFC and SF6 data collected on this cruise will also expand the transient tracer data base for the North Atlantic Ocean. The data will be disseminated widely to the research community following NSF guidelines. Several CLIVAR cruises to the North Atlantic are planned for the 2010 - 2012 time period, and the GEOTRACES cruise will increase the coverage for CFCs and SF6. This database of the temporally evolving CFC and SF6 concentrations in the North Atlantic Ocean is used in studies of the role of the ocean in global climate and the global CO2 cycle. It is used to validate models of ocean circulation and to quantify the uptake and storage of anthropogenic CO2 in the ocean. Such information is critical for society to make sound decisions on policies to deal with climate change.

2010年10月，美国GEOTRACES北大西洋战役巡航船在R/V/ Knorr号上从里斯本起航。不幸的是，在中途，推进系统出现了问题，巡航不得不中止。knor号去了南卡罗来纳州查尔斯顿的一个造船厂进行维修，在那里卸下科学设备和样品，然后运回各个科学家的各个家庭机构。该项目解决了一名最初通过ARRA奖资助参与北大西洋运动的研究者的努力-在2011年11月实地项目恢复时恢复一系列基本观察。在快速反应研究基金（Rapid）的支持下，Lamont-Dougherty地球观测站的一个研究小组将在2011年秋季沿着先前中止的美国GEOTRACES北大西洋样带继续测量CFC-11、CFC-12和SF6的分布。他们将使用这些数据来确定北大西洋水团最近的通风核心，估计这些水团从其来源区域的传输时间，并使用传输时间信息估计该程序测量的选定微量元素的耗氧率和产生或分解率。这些测量对于理解平流、混合和水团形成的物理过程如何影响海洋中微量元素和同位素的分布至关重要。海洋中不断变化的CFC和SF6分布对这些过程提供了强有力的限制。GEOTRACES程序中CFC和SF6的测量将GEOTRACES数据置于这些巡航中CFC/SF6测量建立的大规模通风模式的背景下。更广泛的影响。除了为GEOTRACES项目提供有关通风和运输时间的信息外，此次航行收集的CFC和SF6数据还将扩展北大西洋的瞬态示踪剂数据库。这些数据将按照美国国家科学基金会的指导方针广泛传播给研究界。CLIVAR计划在2010年至2012年期间前往北大西洋进行几次巡航，GEOTRACES巡航将增加氟氯化碳和SF6的覆盖范围。这个北大西洋CFC和SF6浓度的时间演变数据库用于研究海洋在全球气候和全球二氧化碳循环中的作用。它被用来验证海洋环流模式，并量化海洋中人为二氧化碳的吸收和储存。这些信息对于社会就应对气候变化的政策做出合理决策至关重要。