Collaborative Research: What controls the marine refractory DOC reservoir?
合作研究:海洋难熔DOC储层的控制因素是什么?
基本信息
- 批准号:2049590
- 负责人:
- 金额:$ 37.11万
- 依托单位:
- 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:2021-07-15 至 2024-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Dissolved organic carbon (DOC) in the ocean consists of free-floating organic molecules left over from the metabolisms of microscopic marine biota, analogous to the organic residues left behind within soils on land. The ocean currently holds ~660 gigatons C of this DOC, making it the largest reservoir of reduced carbon in the ocean; its size rivaling that of atmospheric CO2. Approximately 97% of this reservoir is comprised of a long-lived fraction, with a mean radiocarbon age of 4000-6000 years, termed refractory DOC (RDOC). RDOC has been traditionally considered a relatively inert and slowly-cycling C reservoir, but recent research suggests its cycling may be more dynamic than previously thought. A dynamic RDOC cycle could play a significant role in Earth’s carbon-climate system, with oxidation of only ~0.4% of the marine RDOC reservoir in one year sufficient to counterbalance the current oceanic sink for atmospheric CO2. However, the biological, chemical, and physical processes that govern this reservoir have largely eluded quantification thus far. This project will use data assimilation of marine DOC concentrations and its isotopes in a numerical modeling synthesis to test, diagnose, and quantify the environmental processes responsible for the production and removal of marine RDOC. The processes that control the marine RDOC reservoir will then be represented in a prognostic Earth System Model, using a future climate forced simulation to reveal the sign and strength of the marine RDOC carbon-climate feedback.The standard paradigm regarding the marine RDOC reservoir is that nearly all marine DOC is internally produced in the surface ocean by primary production and that a fraction persists for 1000’s of years due to production of chemically recalcitrant organic molecules during biological utilization, a process termed the microbial carbon pump. An alternative view is that the marine RDOC pool is instead comprised of a heterogenous mixture of externally & internally produced, modern & aged molecules that have localized sources/sinks and distinct residence times. For example, recently identified localized RDOC removal processes have been identified both at the sea surface (marine aerosol formation) and near the crustal/water column interface (hydrothermal vents, crustal aquifers). Reconciling the many hypothesized DOC sources, sinks, and persistence mechanisms while synthesizing a coherent understanding of what controls the marine RDOC reservoir will require numerical modeling at global scales. This project will utilize recent advances in global ocean basin coverage of marine DOC isotope (both 14C and 13C) measurements to diagnose and quantify the sources and sinks controlling the RDOC reservoir through the implementation of a novel global inverse model of DOC cycling and its isotopes. The pertinent RDOC cycling processes and mechanisms including carbon isotopes from the results of the inverse model will be implemented within the ocean biogeochemistry component (MARBL) of the Community Earth System Model, in order to assess the sign and magnitude of the marine RDOC carbon-climate feedback with a future climate forced coupled simulation. Two graduate students will be supported by this project, one each at UNH and UCSB. The UNH team will work with high school instructors to deliver ocean carbon cycle and Earth & Ocean science curricula modules. Two undergraduate summer interns in ocean science research located at UCSB will be recruited from HBCU’s.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.
海洋中的溶解有机碳(DOC)是由海洋微生物代谢后自由漂浮的有机分子组成,类似于陆地土壤中的有机残留物。海洋目前拥有约660 gigatons C的DOC,使其成为海洋中最大的还原碳库;其大小与大气CO2相当。大约97%的储层是由一个长寿的部分,平均放射性碳年龄为4000-6000年,称为难熔DOC(RDOC)。传统上,RDOC被认为是一种相对惰性和缓慢循环的C库,但最近的研究表明,它的循环可能比以前认为的更动态。一个动态的RDOC循环可能在地球的碳-气候系统中发挥重要作用,一年中海洋RDOC储层的氧化仅为0.4%,足以抵消目前海洋对大气CO2的吸收。然而,到目前为止,控制这一储层的生物、化学和物理过程在很大程度上无法量化。该项目将使用海洋DOC浓度及其同位素的数据同化在数值模拟合成测试,诊断和量化的环境过程负责的生产和去除海洋RDOC。控制海洋RDOC储层的过程将在预测地球系统模型中表示,使用未来气候强迫模拟来揭示海洋RDOC碳的迹象和强度,关于海洋RDOC储层的标准范例是,几乎所有海洋DOC都是通过初级生产在表面海洋中内部产生的,并且由于海洋中的水的存在,在生物利用过程中产生化学上可分解的有机分子,这一过程被称为微生物碳泵。另一种观点是,海洋RDOC池是由外部内部产生的,现代老化的分子,具有本地化的源/汇和不同的停留时间的异质混合物。例如,最近查明的局部RDOC清除过程既在海面(海洋气溶胶形成),也在地壳/水柱界面(热液喷口、地壳含水层)附近。 许多假设的DOC源,汇和持久性机制,同时合成一个一致的理解是什么控制海洋RDOC水库将需要在全球范围内的数值模拟。该项目将利用全球海洋DOC同位素(14 C和13 C)测量覆盖范围的最新进展,通过实施DOC循环及其同位素的新型全球逆模型,诊断和量化控制RDOC水库的源和汇。相关的RDOC循环过程和机制,包括碳同位素的逆模型的结果将在社区地球系统模型的海洋地球化学成分(MARBL)内实施,以评估未来气候强迫耦合模拟的海洋RDOC碳-气候反馈的迹象和幅度。两名研究生将得到该项目的支持,UNH和UCSB各一名。UNH团队将与高中教师合作,提供海洋碳循环和地球海洋科学课程模块。两名位于UCSB的海洋科学研究的本科生暑期实习生将从HBCU招募。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Robert Letscher其他文献
New insights on the deep alkaline phosphatase paradox from a site in the Northeastern Pacific Ocean
来自东北太平洋一个地点的关于深层碱性磷酸酶悖论的新见解
- DOI:
10.1016/j.dsr.2024.104419 - 发表时间:
2025-01-01 - 期刊:
- 影响因子:2.100
- 作者:
Kerry Dykens;Robert Letscher;Atsushi Matsuoka;Kai Ziervogel - 通讯作者:
Kai Ziervogel
Robert Letscher的其他文献
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{{ truncateString('Robert Letscher', 18)}}的其他基金
Collaborative Research: Contribution of allochthonous dissolved organic nitrogen to biological nitrogen demand in the subtropical North Pacific
合作研究:北太平洋副热带地区外来溶解有机氮对生物氮需求的贡献
- 批准号:
2343222 - 财政年份:2024
- 资助金额:
$ 37.11万 - 项目类别:
Continuing Grant
Collaborative Research: Transparent exopolymer and phytoplankton vertical migration as sources for preformed nitrate anomalies in the subtropical N. Pacific Ocean
合作研究:透明外聚合物和浮游植物垂直迁移作为北太平洋副热带硝酸盐异常的来源
- 批准号:
1923687 - 财政年份:2019
- 资助金额:
$ 37.11万 - 项目类别:
Standard Grant
Collaborative Research: Dissolved organic phosphorus controls on marine nitrogen fixation and export production
合作研究:溶解有机磷对海洋固氮和出口生产的控制
- 批准号:
1829916 - 财政年份:2018
- 资助金额:
$ 37.11万 - 项目类别:
Standard Grant
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