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持续时间最长的洪水。在洪水期间，大量的碳可以通过河流运输。河流中的碳可以以颗粒的形式存在，也可以溶解在水中。碳也可以从河流释放到大气中。这个项目调查了在长时间的洪水期间，密西西比河运输或释放了多少碳。河流中的碳影响水生物种和水质。该项目的结果增加了对洪水对大河碳动态影响的理解。本科生和研究生参与取样。气候变化对河流碳运移和转化的影响认识有限。该项目利用了一个独特的、意想不到的机会，将密西西比河的长期洪水与碳通量和运输的测量结合起来。该项目集中测量了地表水中溶解二氧化碳、溶解有机碳和溶解无机碳的分压。这些测量被用来量化这条大河在所有洪水阶段的总溶解碳和二氧化碳通量。研究结果被用来检验关于河流流量变化如何影响河流内碳动态的假设。本科生和研究生在这个项目中接受实地抽样和数据分析的培训。该奖项反映了美国国家科学基金会的法定使命，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

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