Collaborative Research: GreenFjord-FIBER, Observing the Ice-Ocean Interface with Exceptional Resolution

格林峡湾纤维项目是一项科学研究，它使用高科技测量来了解流入海洋的格陵兰冰川在冬季和夏季之间是如何变化的。调查人员将重点放在冰层与海洋的交汇处。通过测量振动和温度的特殊传感器，研究人员的目标是测量冰山从冰川分离的地点和时间，并落入海洋。研究人员还想找出温暖的海水在哪里融化冰层，以及冰川流入海洋的速度是否有联系。这些测量将帮助我们更多地了解格陵兰冰川未来将如何变化，以及这可能对世界各地的海平面意味着什么。这项研究的科学结果及其对当地社区的影响将在格陵兰的课堂上传播。该提议旨在验证这样一种假设，即在从春季到夏季的过渡期，融化源区的制度发生了变化，从以温度为主的融化和崩解转变为以亚冰川排放为主的过程。为了验证这一假设，研究人员将在格陵兰岛卡朱塔普塞尔米亚潮水冰川的崩解前沿部署一种新的光纤仪器。该仪器将测量声学和温度数据，以更好地了解冰下融化和排放对冰解的影响。该项目将利用分布式温度传感(DTS)和分布式声学传感(DAS)系统产生新的测量结果，为冰川-海洋界面观测提供一个令人信服的概念验证，这个环境对设备和人员来说是出了名的危险。包括陆地上的宽带仪器、海底的地震仪和船上的电导率、温度和深度(CTD)数据，将为DTS/DAS的测量提供重要的基准。该项目将支持华盛顿大学主办的夏季研究项目中的两名早期研究人员、一名博士后和一名本科生。与当地一名格陵兰受训教师合作，这项研究的科学结果及其对当地社区的影响将在格陵兰的课堂上传播。这一奖项反映了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。

The GreenFjord-FIBER project is a scientific study that uses high-tech measurements to understand how Greenlandic glaciers flowing into the ocean change between winter and summer. The investigators are focusing on the points where the ice meets the ocean. With special sensors measuring vibrations and temperature, the investigators aim to measure where and when icebergs detach from the glacier and fall into the ocean. The investigators also want to find out where warm ocean water is melting the ice and if there is a connection to the speed at which the glacier flows into the ocean. The measurements will help us learn more about how Greenland's glaciers will change in the future and what that might mean for sea levels around the world. In collaboration with a local Greenlandic teacher-trainee, the scientific results of the study and their implications for local communities will be disseminated in Greenland’s classrooms.The proposal aims to test the hypothesis that a regime change in melt source regions occurs during the spring-to-summer transition period, shifting from temperature-dominated melt and calving to sub-glacial discharge-dominated processes. To test this hypothesis, the investigators will deploy a new optical fiber instrument at the calving front of the Qajuuttap Sermia tidewater glacier in Greenland. This instrument will measure acoustic and temperature data to better understand the effect of sub-glacial melt and discharge on calving. The project will generate novel measurements from Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) systems, making a compelling proof-of-concept for glacier-ocean interface observations, an environment that is notoriously treacherous for equipment and personnel. The inclusion of broadband instruments on land, seismometers on the ocean bottom, and conductivity, temperature, and depth (CTD) casts from boats will provide important benchmarks against the measurements from DTS/DAS. The project will support two early-career researchers, one postdoc, and an undergraduate in a University of Washington hosted summer research program. In collaboration with a local Greenlandic teacher-trainee, the scientific results of the study and their implications for local communities will be disseminated in Greenland’s classrooms.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.