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.

本数据集记录了格陵兰卡纳克（Qaanaaq）周边四座冰川在2004-2021年间的每日次声检测次数。相关观测、数据处理与解读内容详见Evers等人发表于《地球物理学研究快报（Geophysical Research Letters）》2022年的研究论文。
研究团队对格陵兰西北部卡纳克附近的微气压计阵列（microbarometer array）I18DK的18年时长的次声记录开展了系统分析。北极夏季期间，该阵列的声景中累计检测到超过70万次的次声信号，数量庞大。研究同时识别出海洋终止型冰川（marine-terminating glaciers）的崩解事件，以及陆地终止型冰川（land-terminating glacier）的融水径流量相关的声学信号。该次声活动分别与海表温度和大气温度存在显著相关性。研究提取得到年际至日际的变化特征，结果显示次声检测率及冰川活动均存在显著波动。近年陆地终止型冰川的次声检测次数最高，这一结论得到了实际径流量实测数据的支撑，部分结果也得到了径流量模型的验证。最终研究得出结论：对冰川次声信号开展监测，可作为其他被动遥感监测手段的有效补充，能够以高时空分辨率深入解析冰川动力学过程。