GreenFjordFIBER: Submarine Distributed Acoustic– and Temperature Sensing (DAS/DTS) along the Calving Front of a Greenlandic Tidewater Outlet Glacier, 2023

### Access

Data files can be accessed via: https://arcticdata.io/data/10.18739/A2B853K8N

### Overview

Calving fronts of Greenland’s tidewater outlet glaciers are the nexus where atmospheric and oceanic forcings on the cryosphere condense. Dynamic processes acting on these calving fronts, such as iceberg calving, submarine melt, meltwater plume dynamics, and internal wave activity, may not only impact future tidewater glacier evolution but control the stability of the Greenland Ice Sheet.

To study these processes, we deployed a subsea fiber-optic cable along the calving front of Eqalorutsit Kangilliit Sermiat in South Greenland. By utilizing the optical fibers for combined Distributed Acoustic- and Temperature- Sensing (DAS and DTS), we turn the cable into a linear array of thousands of strain and temperature sensing sections. This array of sensors allows to study the seismo-acoustic and thermal wavefield along the calving front, carrying information about dynamic processes such as ice fracturing, calving, subglacial discharge, submarine melt, calving-induced tsunamis and transient internal waves, as well as long-term trends in the fjord thermal stratification.

Gräff, D., Lipovsky, B.P., Vieli, A. et al. Calving-driven fjord dynamics resolved by seafloor fibre sensing. Nature 644, 404–412 (2025). https://doi.org/10.1038/s41586-025-09347-7

### 访问方式
数据集文件可通过以下链接获取：https://arcticdata.io/data/10.18739/A2B853K8N

### 概况
格陵兰潮汐型出口冰川的崩解前沿，是大气与海洋对冰冻圈（cryosphere）的强迫作用汇聚的核心区域。作用于此类崩解前沿的动力过程——涵盖冰山崩解、海底消融、融水羽流动力学与内波活动——不仅会影响未来潮汐型出口冰川的演化轨迹，更将直接调控格陵兰冰盖的整体稳定性。

为研究上述过程，我们在南格陵兰Eqalorutsit Kangilliit Sermiat冰川的崩解前沿布设了一条海底光缆。通过将光纤用于分布式声学与温度联合传感（Distributed Acoustic- and Temperature- Sensing，简称DAS与DTS），我们将这条光缆转化为包含数千个应变与温度传感单元的线性阵列。该传感阵列可用于研究崩解前沿的地震声学与热波场，这些波场携带着诸多动力过程的相关信息，包括冰体断裂、冰山崩解、冰下径流、海底消融、崩解引发的海啸以及瞬时内波，同时也能反映峡湾热层结的长期变化趋势。

Gräff, D., Lipovsky, B.P., Vieli, A. 等. 海底光纤传感解析崩解驱动的峡湾动力学. 《自然》（Nature）, 644, 404–412 (2025). https://doi.org/10.1038/s41586-025-09347-7