AGS-PRF: Observing and Diagnosing Mechanisms of Energy Balance in Temperate Freshwater Systems

AGS-PRF：温带淡水系统能量平衡的观测和诊断机制

• 批准号: 1430396
• 负责人: David Reed
• 金额: $ 8.6万
• 依托单位: Reed David E
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-05-01 至 2017-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1430396&HistoricalAwards=false
• 关键词: AGS; PRF; Observing; Diagnosing; Mechanisms

Freshwater lakes play a small but important role in the transfer of energy and carbon to the atmosphere. Current earth system models rely mainly on lake temperature to determine how active these systems are, but they do an inadequate job during wintertime ice and transition season conditions. The funding under this grant will provide an early career researcher the opportunity to study the complete picture of lake thermodynamics by making a suite of measurements from a platform in the middle of a mid-latitude lake. The main scientific benefit of this award will be improved modeling of lakes within the widely used Community Land Model. Local high school students and undergraduates will be actively solicited to participate with the project and the lead researcher will also work to develop high school teaching modules. Data from this project, such as ice thickness, will be disseminated at near real-time to stakeholders including the Wisconsin Department of Natural Resources, which will benefit the public and economy by increasing the safety of major wintertime activities like ice fishing.Freshwater energy, momentum, and biogeochemical cycles are coupled in ways unique to other terrestrial or ocean systems, but observations and theoretical improvements of all these processes has been limited. This research project will specifically focus on quantifying all parts of a lake energy budget with the goal of reaching a complete thermodynamic closure, in order to improve process-level understanding of changes in ice-cover and feedbacks to biogeochemistry. The researcher will use year round eddy covariance flux data currently deployed on a lake, in combination with novel lake thermal measurements, to understand time lake processes, particularly in winter. With new insight into the processes that control surface heat flux, this project will refine theories of lake energy cycling and improve prediction of lake carbon cycling, particularly during ice-transition periods.

淡水湖在将能量和碳转移到大气中起着很小但很重要的作用。目前的地球系统模型主要依靠湖泊温度来确定这些系统的活动程度，但它们在冬季结冰和过渡季节条件下的作用不够充分。这笔赠款下的资金将为早期职业研究人员提供机会，通过在中纬度湖泊中央的平台上进行一系列测量，来研究湖泊热力学的完整图景。该奖项的主要科学收益将是在广泛使用的社区土地模型中改进湖泊建模。将积极征集当地高中生和本科生参与该项目，首席研究员也将致力于开发高中教学模块。来自该项目的数据，如冰层厚度，将近乎实时地传播给包括威斯康星州自然资源部在内的利益相关者，这将通过提高主要冬季活动(如冰钓)的安全性而造福公众和经济。淡水能量、动量和生物地球化学循环以其他陆地或海洋系统独有的方式耦合，但对所有这些过程的观察和理论改进一直有限。这一研究项目将特别侧重于量化湖泊能量收支的所有部分，目标是实现完全的热力学闭合，以便改进对冰盖变化和对生物地球化学的反馈的过程一级的了解。研究人员将使用目前部署在湖泊上的全年涡旋协方差通量数据，结合新的湖泊温度测量，来了解时间湖泊过程，特别是在冬季。随着对控制地表热通量的过程有了新的认识，该项目将完善湖泊能量循环的理论，并提高对湖泊碳循环的预测，特别是在冰川过渡时期。