Collaborative Research: Physical Feedbacks in the Coastal Alaskan Arctic during Landfast Ice Freeze-up

合作研究：阿拉斯加北极沿海地区陆地冰冻期间的物理反馈

• 批准号: 2336695
• 负责人: Emily Eidam
• 金额: $ 37.9万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-05-01 至 2027-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2336695&HistoricalAwards=false
• 关键词: Collaborative; Research; Physical; Feedbacks; Coastal

The loss of sea ice in the Arctic is increasing the exposure of the coastline to waves and storms. The timing and location of ice formation in the fall also affects how sediment moves through the region. The proposed work will explore how waves, storms, and sediment interact during fall in the Alaskan Arctic. This new understanding will result in better predictions of ice formation at the coastline, which varies significantly in space and time. The project will use observations obtained from instruments deployed on the seafloor and from ships to watch how freeze-up occurs over a section of the coastal Alaskan Arctic. We will introduce new ways of making measurements in the Arctic, that are both cheaper and better-adapted to the harsh environment, which can be incorporated into future work. These observations will be compared with seasonal and prior datasets to understand how the freeze-up may vary in different years. Scientists will engage with middle and high school students both locally (in the Arctic) and from the continental US. This work will focus on developing a coastal ocean unit, which teaches students about the science and walks them through building and deploying small instruments.The rapid decline in landfast ice in the coastal Arctic is increasing the duration of wave exposure and strength of wave energy reaching the coast each year. Because landfast ice forms in shallow water, sediment entrainment into the ice also plays a key role in mediating export. The proposed work will address fundamental feedbacks and connections of physical processes on the Alaskan Arctic shelf during fall freeze-up. This new understanding will enable better predictions of seasonal and decadal changes in landfast ice formation, which has a high amount of variability on multiple spatial and temporal scales. Analysis will also improve our understanding of the sediment pathways during the stormy fall period. The field experiment will use moorings, autonomous systems, and seafloor cables to capture the spatial and temporal variability in freeze-up processes over a region on the Alaskan Beaufort shelf. The research will take a nested approach, utilizing seasonal observations and pre-existing inter-annual time series to capture the roles of offshore forcing, local hydrodynamic processes, and air-sea exchange. Measurements will be made using novel integration of multiple new low-cost telemetered sensors, amphibious drones, seafloor cables, and Arctic-hardened moorings, building capacity for future autonomous observing and monitoring systems adapted for the coastal Arctic. Outreach efforts during the project will engage regional high school students, as well as students who have never experienced the Arctic. We will continue building on a “Coastal Oceanography” unit developed over the past four years for high schoolers in an Alaskan Arctic village, expanded to include the middle school, and incorporating virtual lessons with annual in-person activities to deploy small student-built instruments. Additionally, we will establish ongoing engagement with middle school science classes in three locations with in-person visits prior to the fieldwork, live-stream events during the cruise, and follow-up visits afterwards.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.

北极中海冰的损失正在增加海岸线暴露于海浪和风暴中。秋季冰形成的时间和位置也影响了沉积物如何穿过该地区。拟议的工作将探讨在阿拉斯加北极秋天期间的波浪，暴风雨和沉积物如何相互作用。这种新的理解将在海岸线上更好地预测冰的形成，这在时空和时间上差异很大。该项目将使用从海底部署的工具获得的观察结果，并从船只上观看冰冻的观察，如何在阿拉斯加北极沿海北极的一部分上发生冻结。我们将介绍在北极进行测量的新方法，这些方法既便宜又适合于Harmh环境，这些环境可以纳入将来的工作。这些观察结果将与季节性和先前数据集进行比较，以了解在不同年份中冻结可能会有所不同。科学家将与当地（在北极）和连续美国的中学学生互动。这项工作将着重于开发一个沿海海洋单元，该单元向学生传授科学知识，并通过建造和部署小型乐器来驱动他们。北极沿海地区的Landfast ICE的迅速下降正在增加每年到达沿海的波浪暴露和强度的波浪持续时间。由于在浅水中形成陆地冰块，因此进入冰的沉积物入口在中介出口中也起着关键作用。拟议的工作将介绍秋季冷冻期间阿拉斯加北极架子上物理过程的基本反馈和联系。这种新的理解将可以更好地预测陆地冰形成的季节性和十年变化，这在多个空间和临时尺度上具有很高的可变性。分析还将提高我们对暴风雨期间沉积物途径的理解。现场实验将使用系泊设备，自主系统和海底电缆来捕获阿拉斯加Beaufort货架上一个区域上的冻结过程中的空间和临时变异性。这项研究将采用一种嵌套方法，利用季节性观察和预先存在的年际时间序列来捕获离岸强迫，局部流体动力学过程和空气海洋交换的作用。将使用多个新的低成本遥测传感器，两栖无人机，海底电缆和北极硬化的系泊设备的新型整合进行测量，以使未来自主观察和监测系统适合于沿海北极的建筑能力。该项目期间的推广工作将吸引地区高中生以及从未经历过北极的学生。在过去的四年中，我们将继续建立一个在阿拉斯加北极村庄的高中生开发的“沿海海洋学”部门，扩展到包括中学，并将虚拟课程与年度面对面的活动一起，以部署小型学生建造的乐器。此外，我们将在三个地点与中学科学课程建立持续的互动，并在野外工作之前，在巡航期间进行实时访问，随后进行后续访问。这项奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子和更广泛影响的评估审查审查的审查标准来通过评估来通过评估来获得的支持。