TY - JOUR
T1 - Calving signature in ocean waves at helheim glacier and sermilik fjord, east greenland
AU - Vaňková, Irena
AU - Holland, David M.
N1 - Funding Information:
Field work at Sermilik Fjord and Helheim Glacier and the work of both authors was supported by NSF Office of Polar ProgramGrants ARC-0806393 and ARC-1304137, NASA Polar ProgramsGrant NNX08AN52G, and the NYU Abu Dhabi Center for Global Sea Level Change Grant G1204. Moorings in the fjord were deployed by Carl Gladish in August 2013. NYU High-Performance Computing clusters in New York were used to runMITgcm simulations. We thank the reviewers, Mark Inall and Jason Amundson, for useful suggestions and insights that significantly improved the quality of this article.
Publisher Copyright:
© 2016 American Meteorological Society.
PY - 2016
Y1 - 2016
N2 - When glaciers calve icebergs, a fraction of the released potential energy is radiated away via gravity waves. The characteristics of such waves, caused by iceberg calving on Helheim Glacier in east Greenland, are investigated. Observations were collected from an array of five high-frequency bottom pressure meters placed along Sermilik Fjord. Calving-generated tsunami waves were identified and used to construct a calving event catalog. Calving events are observed to cluster around high and low semidiurnal tides and around high and prior-to-low semimonthly tides. In the postcalving ocean state, discrete spectral peaks associated with calving events are observed, and they are consistent among all the events. A numerical model is used to compute the resonant modes of the fjord and to simulate calving-generated ocean waves. Damped oscillator boundary forcing with 5- to 10-min periods is found to reproduce well the observed properties of calving waves. These observations and modeling are relevant for better understanding of wave dynamics in glacier fjords.
AB - When glaciers calve icebergs, a fraction of the released potential energy is radiated away via gravity waves. The characteristics of such waves, caused by iceberg calving on Helheim Glacier in east Greenland, are investigated. Observations were collected from an array of five high-frequency bottom pressure meters placed along Sermilik Fjord. Calving-generated tsunami waves were identified and used to construct a calving event catalog. Calving events are observed to cluster around high and low semidiurnal tides and around high and prior-to-low semimonthly tides. In the postcalving ocean state, discrete spectral peaks associated with calving events are observed, and they are consistent among all the events. A numerical model is used to compute the resonant modes of the fjord and to simulate calving-generated ocean waves. Damped oscillator boundary forcing with 5- to 10-min periods is found to reproduce well the observed properties of calving waves. These observations and modeling are relevant for better understanding of wave dynamics in glacier fjords.
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U2 - 10.1175/JPO-D-15-0236.1
DO - 10.1175/JPO-D-15-0236.1
M3 - Article
AN - SCOPUS:84994175832
VL - 46
SP - 2925
EP - 2941
JO - Journal of Physical Oceanography
JF - Journal of Physical Oceanography
SN - 0022-3670
IS - 10
ER -