EAGER: Preliminary Investigation of the Stott and Timmermann Hypothesis that Hydrothermal Carbon Fluxes Influenced Glacial/Interglacial DELTA 14C Variability

EAGER：对 Stott 和 Timmermann 假设热液碳通量影响冰川/间冰期 DELTA 14C 变异性的初步研究

• 批准号: 1344514
• 负责人: Lowell Stott
• 金额: $ 3.68万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1344514&HistoricalAwards=false
• 关键词: EAGER; Preliminary; Investigation; Stott; Timmermann

A large number of studies have sought explanations for glacial/interglacial atmospheric carbon dioxide (CO2) cycles via ocean processes that transfer CO2 to/from the deep ocean. While research continues to pursue such mechanisms, recent studies have introduced new observations that require consideration of geologic processes as well. One recent hypothesis that incorporates geologic processes (Stott and Timmermann, 2011) posited that changes in ocean temperatures, which are fixed at high latitudes, regulate CO2-hydrate stability at intermediate depths in the Pacific Ocean and in doing so, modulate the accumulation and release of CO2-rich fluids that accumulate within the sediments that blanket hydrothermal systems. However, without the availability of cores from the sites near known hydrothermal systems in the western Pacific, it has not been possible to adequately test this hypothesis. This EAGER project, led by the faculty member at the University of Southern California who co-authored the concept paper, will fund collaboration with a team of German scientists to collect sediment cores from the western tropical Pacific, near Mindinao. These materials should enable testing of the controversial hydrothermal CO2 hypothesis. If a geologic source for the old carbon signal could be identified and conclusively linked to the water column signals, it could potentially transform the way we think of the connections between the solid Earth and climate. Funding supports participation in the research expedition for two members of the principal investigator's research group, along with generation of key preliminary data from the cores. Broader impacts include international collaborations and partial support of a graduate student at the University of Southern California.

大量研究寻求解释冰川/冰川间大气二氧化碳（CO2）循环，通过将CO2转移到深海的海洋过程。尽管研究继续追求此类机制，但最近的研究也引入了新的观察结果，还需要考虑地质过程。最近结合地质过程的一个假设（Stott and Timmermann，2011年）认为，海洋温度的变化是固定在高纬度上的，可以调节太平洋中间深度的二氧化碳 - 水流稳定性，并在此过程中调节了氧化热量的氧化和释放，从而在氧化和释放中堆积了众多的氧化热量系统。但是，如果没有西太平洋已知的热液系统附近地点的核心，则无法充分检验这一假设。这项由南加州大学的教职员工领导的渴望的项目将与一组德国科学家团队合作，以收集从Mindinao附近的西部热带太平洋地区收集沉积物核心。这些材料应能够测试有争议的水热CO2假设。如果可以识别出旧碳信号的地质来源并最终与水柱信号联系在一起，则它可能会改变我们对固体土和气候之间的联系的方式。资金支持主要研究者研究小组的两名成员的研究探险，以及核心的关键初步数据。更广泛的影响包括国际合作和南加州大学研究生的部分支持。