Geophysical Research Letters
Supporting Information for
Underwater acoustic signatures of glacier calving
Oskar Glowacki1, Grant B. Deane2, Mateusz Moskalik1, Philippe Blondel3, Jaroslaw Tegowski4, Malgorzata Blaszczyk5
1. Centre for Polar Studies, Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland
2. Scripps Institution of Oceanography, UCSD, La Jolla, USA
3. University of Bath, Department of Physics, Bath, United Kingdom
4. University of Gdansk, Institute of Oceanography, Gdynia, Poland
5. University of Silesia, Faculty of Earth Sciences, Sosnowiec, Poland]
Contents of this file
Figure S1
Table S1
Additional Supporting Information (Files uploaded separately)
Captions for Movies S1 to S3
Introduction
We provide three movies containing underwater sounds, each lasting one minute. They show different calving modes from the Hans Glacier, captured during a 3-day experiment conducted in the Hornsund fjord, Spitsbergen in August 2013. Our 5-Mpixel GoPro Gero 3 Silver Edition digital camera took time-lapse photos every half a second with 19 mm full-frame focal length equivalent, f/2.8 f-stop size and ISO-100 sensitivity. The loud background noise is generated by air bubbles escaping from the glacial ice.
Additionally, we present one figure showing the study site and one table with correlation coefficients between basic variables.
Figure S1. Overview of the study site (a, b) together with Hans Glacier front velocity (in cm per hour) between August 5 and August 24, 2013 (c). Positions of time-lapse camera (TLC), acoustic (S1 for August 20, S2 for August 21 and S3 for August 24) and glacier (GPS1, GPS2) measurements, superimposed on a Landsat 8 RGB composite, are marked with dots. Colored dots show locations of ice fall events with distinction between modes, where green means typical detachment, red – sliding, and orange - submarine. The black line in the velocity plot corresponds to measurements at the northernmost point (GPS2) and the grey line to the southernmost point (GPS1). Red patterns highlight Hans glacier area loss between August 24 and September 25, equaling 130,000 m2. Satellite data collected on August 24, 2013, courtesy of the U.S. Geological Survey, Department of the Interior.
Variable / (1) / (2) / (3) / (4)(1) Acoustic energy / 1
(2) Block length / 0.73 / 1
(3) Block height / 0.86 / 0.89 / 1
(4) Drop height / -0.39 / -0.62 / -0.32 / 1
Table S1. Correlation matrix for basic variables.
Movie S1. Typical subaerial calving event from the Hans Glacier captured in August 24, 2013.
Movie S1. Sliding subaerial calving event from the Hans Glacier captured in August 20, 2013.
Movie S1. Submarine calving event from the Hans Glacier captured in August 21, 2013.
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