Data underlying the publication: Long-term infrasonic monitoring of land and marine-terminating glaciers in Greenland

Number of infrasonic detections per day for 2004-2021 for four glaciers surrounding Qaanaaq (Greenland). The observations, data processing and interpretation are described in Evers et al., Geophysical Research Letters, 2022.A period of 18 years of infrasonic recordings was analyzed from a microbarometer array (I18DK) in northwestern Greenland, near Qaanaaq. A huge number of infrasonic detections, over 700,000, have been made in I18DKs soundscape during the Arctic summers. Simultaneously identified were both calving events from marine-terminating glaciers and discharge related acoustics from a land-terminating glacier. This infrasonic activity is correlated to sea-surface and atmospheric temperature, respectively. Inter-yearly to daily variations were retrieved showing a strong variability in infrasonic detection rates and hence glacier activity. The highest number of infrasonic detections were found in recent years from the land-terminating glacier. The latter is supported by actual discharge measurements and partly by a discharge model. It is concluded that monitoring infrasound from glaciers can complement other techniques to remotely and passively get insights into glacier dynamics with high temporal and spatial resolution.<br>

本数据集涵盖格陵兰卡纳克（Qaanaaq）周边四座冰川2004年至2021年的每日次声检测（infrasonic detection）次数。本数据集的观测方案、数据处理流程及解读方法详见Evers等人2022年发表于《Geophysical Research Letters》的研究成果。研究分析了格陵兰西北部卡纳克附近的微压传感器阵列（microbarometer array，编号I18DK）获取的18年时长的次声记录数据。在北极夏季期间，该阵列的监测声域内共记录到超过70万次次声检测事件。本次研究同时识别出入海冰川（marine-terminating glacier）的冰崩事件（calving event），以及陆基冰川（land-terminating glacier）的径流相关声学信号。该次声活动分别与海表温度及大气温度呈显著相关。研究提取了年际至逐日的变化特征，结果显示次声检测率乃至冰川活动均存在显著波动。研究发现近年来陆基冰川的次声检测次数最多，该结果得到实际径流测量数据的佐证，部分结论同时辅以径流模型验证。综上，对冰川次声的监测可作为其他技术的补充手段，以高时空分辨率实现冰川动力学过程的被动遥感式认知。