RAPID: Dissolved carbon transport and CO2 outgassing under an unprecedented long-lasting flood of the Mississippi-Atchafalaya River System

RAPID：密西西比-阿查法拉亚河系统前所未有的长期洪水下的溶解碳迁移和二氧化碳释放

• 批准号: 1937826
• 负责人: YiJun Xu
• 金额: $ 3.43万
• 依托单位: Louisiana State University Agricultural Center
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1937826&HistoricalAwards=false
• 关键词: RAPID; Dissolved; carbon; transport; CO2

The Mississippi River is experiencing the longest, consecutive days of flooding. During floods, large amounts of carbon can be transported in rivers. Carbon in rivers can be in the form of particles or dissolved in the water. The carbon can also be released to the atmosphere from the river. This project investigates how much carbon is transported or released in the Mississippi River during prolonged flooding. The carbon in rivers impacts aquatic species and water quality. The results of this project increase the understanding of the impact of floods on carbon dynamics in large rivers. Undergraduate and graduate students participate in sampling the water.The knowledge of the effect of climate change on river carbon transport and transformation is limited. This project takes advantage of a unique and unanticipated opportunity to couple prolonged flooding of the Mississippi River with measurements of carbon flux and transport. The project intensively measures the partial pressure of dissolved carbon dioxide, dissolved organic carbon, and dissolved inorganic carbon in the surface water. These measurements are used to quantify the total dissolved carbon and carbon dioxide flux from this large river during all flood stages. The results are used to test hypotheses regarding how changes in river flow regime may impact in-stream carbon dynamics. Undergraduate and graduate students receive training in field sampling and data analysis during this project.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.

密西西比河正在经历最长，连续的洪水。在洪水期间，可以在河流中运输大量碳。 河流中的碳可以以颗粒的形式或溶解在水中。碳也可以释放到河中的大气中。 该项目调查了长期洪水期间在密西西比河中运输或释放多少碳。 河流中的碳影响水生植物和水质。 该项目的结果增加了对洪水对大河碳动态的影响的理解。本科生和研究生参与取水。了解气候变化对河流碳运输和转型的影响的了解是有限的。该项目利用了一个独特而意外的机会，将密西西比河的长时间洪水与碳通量和运输的衡量相结合。该项目深入测量溶解的二氧化碳，溶解有机碳的部分压力，并溶解在地表水中的无机碳。 在所有洪水阶段，这些测量值用于量化这条大河流中溶解的碳和二氧化碳通量。结果用于检验有关河流状况变化如何影响流碳动力学的假设。本项目期间，本科生和研究生接受了现场抽样和数据分析的培训。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响评估标准，被认为值得通过评估来获得支持。

项目成果

Dissolved carbon export and CO2 outgassing from the lower Mississippi River – Implications of future river carbon fluxes

• DOI: 10.1016/j.jhydrol.2019.124093
• 发表时间: 2019-11
• 期刊: Journal of Hydrology
• 影响因子: 6.4
• 作者: J. Reiman;Y. Xu