Collaborative Research: The physical and chemical dynamics of groundwater flow across the land-sea interface in Arctic lagoon ecosystems

合作研究：北极泻湖生态系统陆海界面地下水流的物理和化学动力学

• 批准号: 1938873
• 负责人: Matthew Charette
• 金额: $ 47.87万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-03-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1938873&HistoricalAwards=false
• 关键词: Collaborative; Research; physical; chemical; dynamics

Coastal areas in the Arctic are changing rapidly, with increases in river flow, coastal erosion, and permafrost thaw, and as underground ice melts, thin, shallow aquifers develop. At the same time, the amount, organic and inorganic nutrient content, and pathways of coastal groundwater have been understudied and remain poorly understood in the Arctic. This study will combine field measurements and numerical modeling to characterize groundwater flow to Beaufort Sea lagoons and how it changes across seasons and years. The project will train undergraduate and graduate students, disseminate the knowledge gained to communities close to the study area and near the investigators’ institutions, including K-12 students and local agencies involved in managing the Arctic coast, create and broadcast content for public education, and provide data and tools to help understand fundamental processes in the Arctic. This project will provide fundamental new knowledge regarding groundwater flow and biogeochemical processes in lagoon systems along the Alaskan Beaufort Sea coast. The primary research objectives are: 1) to determine the mechanisms and pathways for groundwater flow across the land-lagoon interface and how these mechanisms and pathways evolve seasonally; and 2) to understand seasonally-varying fluxes, sources, and lability of groundwater-derived dissolved organic matter and inorganic nutrients delivered to lagoons along the eastern Alaskan Beaufort Sea coast. A suite of methods will include isotopic, biogeochemical, hydrologic, and geophysical field measurements of groundwater flow and solute transport across the land-lagoon interface during spring ice-break-up, later summer open water season, and until winter freeze up. The investigators will interpret the observations and develop physical insight using computation flow and transport modeling.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.

北极沿海地区正在迅速变化，河流流量增加、海岸侵蚀和永久冻土融化，并且随着地下冰融化，薄而浅的含水层的数量、有机和无机养分含量以及通道不断发展。这项研究将通过现场测量和数值模拟来描述波弗特海泻湖的地下水流及其随季节和年份的变化。和研究生，向研究区域附近和调查人员机构附近的社区传播获得的知识，包括 K-12 学生和参与北极海岸管理的当地机构，创建和广播公共教育内容，并提供数据和工具帮助了解北极的基本过程。该项目将提供有关阿拉斯加波弗特海沿岸泻湖系统地下水流和生物地球化学过程的基本新知识。主要研究目标是：1）确定地下水流的机制和路径。这陆地-泻湖界面以及这些机制和路径如何季节性演变；2）了解输送到阿拉斯加波弗特海东部沿岸泻湖的地下水来源的溶解有机物和无机营养物的季节性变化通量、来源和不稳定性。方法将包括在春季破冰期间、夏季晚些时候开放水域季节以及直到研究人员将使用计算流和传输模型来解释观察结果并开发物理洞察力。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力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

Radium Inputs Into the Arctic Ocean From Rivers: A Basin‐Wide Estimate

镭从河流流入北冰洋：一个盆地——广泛估计

• DOI: 10.1029/2022jc018964
• 发表时间: 2022
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Bullock, Emma J.;Kipp, Lauren;Moore, Willard;Brown, Kristina;Mann, Paul J.;Vonk, Jorien E.;Zimov, Nikita;Charette, Matthew A.
• 通讯作者: Charette, Matthew A.