Long‐Term Infrasonic Monitoring of Land and Marine‐Terminating Glaciers in Greenland
Long‐Term Infrasonic Monitoring of Land and Marine‐Terminating Glaciers in Greenland
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格陵兰岛陆地和海洋终止冰川的长期次声监测
DOI：
10.1029/2021gl097113
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发表时间：
2022
影响因子：
5.2
通讯作者：
Sugiyama S.
中科院分区：
文献类型：
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作者：
Evers L. G.;Smets P. S. M.;Assink J. D.;Shani‐Kadmiel S.;Kondo K.;Sugiyama S.
一个为期18年的次声记录进行了分析，从微型气压计阵列（I18DK）在格陵兰岛西北部，Qaanaaq附近。在北极的夏天，在I18DKs声景中进行了大量的次声探测，超过70万次。同时确定了来自海洋终止冰川的产犊事件和来自陆地终止冰川的放电相关声学。这种次声活动分别与海面和大气温度相关。检索到的年际至每日变化显示次声检测率存在很强的变异性，因此冰川活动也存在很强的变异性。近年来，在陆地终止冰川中发现了最多的次声探测。后者得到实际排放测量值和部分排放模型的支持。它的结论是，监测次声从冰川可以补充其他技术远程和被动地获得洞察冰川动态与高的时间和空间分辨率。
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.