Beyond salt: Effects of estuarine circulation and mixing timescales on biogeochemistry

除了盐：河口循环和混合时间尺度对生物地球化学的影响

• 批准号: 2122420
• 负责人: Parker MacCready
• 金额: $ 68.57万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2122420&HistoricalAwards=false
• 关键词: Beyond; salt; Effects; estuarine; circulation

Simplified physics using theoretical approaches will allow prediction of the response of coastal environments, particularly their water quality, to climate variations. This study will attempt to derive reliable results from simplified physics that are equivalent to results from complex three-dimensional computer models in estuaries, based on full-fledged physics principles. The study will then incorporate biogeochemical variables, such as carbon and dissolved oxygen, in the theoretical formulation and explore different responses of an estuary to processes that can be linked to climate variability. This project will support one graduate student and its results will benefit regional stakeholders such as fishery and aquaculture managers, state agencies and indigenous people.The goals of this study are twofold: 1) to advance understanding of the link between vertical mixing and horizontal advection in estuaries, and 2) to investigate the effects of transport timescales and spatial structure on biogeochemical properties in estuaries. The investigation will extrapolate the efflux-reflux theory of Cokelet & Stewart (1985), showing that horizontal exchange transports are comparable to vertical transports. The approach is to apply the theory to the output from idealized and realistic numerical models. Particle-tracking experiments will further determine which portion of the water is brought into the estuary with the exchange flow and which portion is mixed upward, becoming part of the outflow. The study will also explore a parameter space for various exchange rates, via box models. The project will continue to support one graduate student. Results will eventually be useful for studies of water quality in estuaries.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.

使用理论方法的简化物理学将能够预测沿海环境，特别是其水质对气候变化的反应。这项研究将尝试从简化的物理中得出可靠的结果，这些结果相当于河口复杂的三维计算机模型的结果，基于成熟的物理原理。然后，该研究将把生物地球化学变量，如碳和溶解氧，纳入理论公式，并探索河口对可能与气候变化有关的过程的不同反应。该项目将支持一名研究生，其成果将使渔业和水产养殖管理人员、国家机构和土著人民等区域利益攸关方受益。本研究的目的有两个：1)进一步了解河口垂直混合与水平平流之间的联系；2)研究输送时间尺度和空间结构对河口生物地球化学性质的影响。本研究将推断Cokelet & Stewart（1985）的流出回流理论，表明水平交换运输与垂直运输相当。方法是将理论应用于理想化和现实的数值模型的输出。颗粒跟踪实验将进一步确定哪些部分的水随交换流进入河口，哪些部分向上混合，成为流出的一部分。该研究还将通过盒模型探索各种汇率的参数空间。该项目将继续资助一名研究生。研究结果最终将对河口水质的研究有用。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。