Long-Term Infrasonic Monitoring of Land and Marine-Terminating Glaciers in Greenland
Laslo Evers (Royal Netherlands Meteorological Institute (KNMI), TU Delft - Applied Geophysics and Petrophysics)
Pieter S.M. Smets (TU Delft - Applied Geophysics and Petrophysics)
J. D. Assink (Royal Netherlands Meteorological Institute (KNMI))
S. Shani-Kadmiel (Royal Netherlands Meteorological Institute (KNMI))
K Kondo (Hokkaido University)
S. Sugiyama (Hokkaido University)
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Abstract
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.
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