Impacts of Acid Mine Drainage on Dissolved Inorganic Carbon Cycling in Receiving Streams

酸性矿山排水对接收流中溶解无机碳循环的影响

• 批准号: 0715562
• 负责人: Eliot Atekwana
• 金额: --
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-11-10 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0715562&HistoricalAwards=false
• 关键词: Impacts; Acid; Mine; Drainage; Dissolved

05-10954 Atekwana... Streams represent an important link in the conversion of terrestrial carbon and its transfer to the atmospheric or oceanic reservoir. Perturbation of dissolved inorganic carbon (DIC) pool in streams by acid mine drainage (AMD) has important consequences for biological activities, chemical reactions, and carbon dynamics. This project will investigate the hypothesis that AMD impacted watersheds act as a "chemical pump" converting and transferring carbon from terrestrial reservoirs to the atmospheric reservoir. Carbonate buffering reactions in AMD impacted watersheds potentially convert large amounts of carbon stored in the terrestrial reservoir into solution, which is lost to the atmosphere as acid mine drainage is discharged to streams. Given the more than 557,650 abandoned mine sites in the United States, and more globally, AMD impacted watersheds may serve as a significant source of CO2 to the atmosphere in the long term, and thus increasing the atmospheric carbon budget. Carbon cycling in AMD impacted streams will be investigated by assessing DIC flux from AMD impacted groundwater to streams, the evolution of DIC within the streams, the exchange between stream water DIC and atmospheric CO2, and export of stream water DIC from impacted watersheds. The project objectives will be achieved by conducting field and laboratory studies to: 1) document the spatial and temporal patterns of DIC, isotope ratio of DIC, major ions, and metals in AMD impacted groundwater and stream water, 2) determine the important physical and biogeochemical processes controlling the distribution, concentration, and isotope ratio of DIC in AMD impacted stream water, and 3) develop a model that captures the dynamic interaction of the processes and controls on carbon cycling in AMD impacted streams. Research on carbon cycling in AMD impacted watersheds is an important component of the larger global change question resulting from anthropogenic forcing. Thus, the proposed research is expected to provide a framework for understanding carbon fluxes in AMD impacted watersheds, which is critical for assessing anthropogenic forcing on watershed-scale carbon dynamics. This study will allow us to determine important controls on the transfer and exchange of CO2 between AMD impacted watershed and the atmosphere. As part of the broader impact components, two students (a minority graduate and an undergraduate student) will be mentored and trained in this project. Field sampling related to the proposed project will form the basis of hands-on field and laboratory exercises in aqueous geochemistry and stable isotope geology courses taught by the PI. The PI will also engage other undergraduates as part of University of Missouri Rolla (UMR) Opportunities for Undergraduate Research Experience (OURE) program. Seniors and junior high school students in the UMRs summer Jackling Institute with a geosciences preference will also be engaged in the field and laboratory component of this project. The results of the study will be disseminated at geoscience conferences and in peer review publications

05-10954 Atekwana ...流是陆生碳转换及其转移到大气或海洋水库的重要联系。通过酸矿物排水（AMD）在溪流中溶解的无机碳（DIC）库的扰动对生物活性，化学反应和碳动力学有重要影响。该项目将调查AMD影响流域的假设作为一种“化学泵”，将碳从地面储层转移到大气储层。 AMD中的碳酸盐缓冲反应影响了陆地储层中存储的大量碳的流域，随着酸矿物排水排放到溪流中，陆地储层中的大量碳被转化为溶液。鉴于在美国以及全球范围内有超过557,650层被废弃的矿场，从长远来看，受AMD影响的分水岭可以作为大气的重要来源，从而增加了大气碳预算。通过评估AMD影响地下水的DIC通量，溪流中DIC的演变，流水DIC和大气CO2之间的交换以及从受影响的流域出口流水DIC，将研究受影响的溪流中的碳循环。 The project objectives will be achieved by conducting field and laboratory studies to: 1) document the spatial and temporal patterns of DIC, isotope ratio of DIC, major ions, and metals in AMD impacted groundwater and stream water, 2) determine the important physical and biogeochemical processes controlling the distribution, concentration, and isotope ratio of DIC in AMD impacted stream water, and 3) develop a model that captures the dynamic interaction of the AMD中碳循环的过程和控制受影响的流。对AMD影响的流域中碳循环的研究是由人为强迫引起的全球变化问题的重要组成部分。因此，拟议的研究有望提供一个框架，以了解AMD受影响的流域中的碳通量，这对于评估在流域规模碳动力学上的人为强迫至关重要。这项研究将使我们能够确定对AMD影响的分水岭和大气之间CO2转移和交换的重要控制。作为更广泛的影响组成部分的一部分，将在该项目中对两个学生（少数毕业生和一名本科生）进行指导和培训。与拟议项目相关的现场抽样将构成在水性地球化学和稳定的同位素地质课程中的动手实地和实验室练习的基础。 PI还将吸引其他本科生，作为密苏里大学Rolla大学（UMR）的本科研究经验（Oure）计划的一部分。 UMRS Summer Jackling Institute的高年级学生和年级学生也将参与该项目的现场和实验室组成部分。该研究的结果将在地球科学会议和同行评审出版物中传播