Ph.D. student in geophysics
Geophysical Institute
903 Koyukuk Dr.
Fairbanks, AK 99775-7320
U.S.A.
Ph: +1 (907) 474-7443
e-mail: amundson@gi.alaska.edu
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Jason
Amundson Ph.D. student in geophysics Geophysical Institute 903 Koyukuk Dr. Fairbanks, AK 99775-7320 U.S.A. Ph: +1 (907) 474-7443 e-mail: amundson@gi.alaska.edu |
My current research focuses on the dynamics of the rapid retreat and acceleration of Jakobshavn Isbræ (Greenlandic: Sermeq Kujalleq), Greenland. Since the late 1990's Jakobshavn Isbræ, as well as several other large outlet glaciers of the Greenland Ice Sheet, has undergone dramatic thinning (~100 m), rapid acceleration (a doubling of the near-terminus velocities), and drastic terminus retreat (over 10 km). Ice sheet models are unable to account for these rapid changes, due to their inability to address mass loss due to calving and the resulting glacier response, thus raising concerns that current predictions of global sea level rise may be significantly too low. I am using velocity measurements, observations of calving and iceberg motion from timelapse and satellite imagery, seismic and audio recordings, and measurements of ocean waves to the mechanisms by which the glacier and ocean interact. Some calving events at Jakobshavn Isbræ have been captured as high temporal-resolution timelapse imagery and stitched into quicktime videos. You can download a few of them here. |
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Publications |
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Amundson, J.M, M. Truffer, M.P. Lüthi, M. Fahnestock, M. West, and R.J. Motyka, 2008. Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbræ, Greenland. Geophys. Res. Lett., 35(L22501), doi:10.1029/2008GL035281. Amundson, J.M., M. Truffer, and M.P. Lüthi, 2006. Time-dependent basal stress conditions beneath Black Rapids Glacier, Alaska, inferred from measurements of ice deformation and surface motion. J. Glaciol., 52(178), 347-357. Amundson, J.M., and N.R. Iverson, 2006. Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada. J. Geophys. Res. - Earth Surface, 111, F01020, doi:10.1029/2005JF000359. |
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Presentations |
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Amundson, J.M, M. Fahnestock, M. Truffer, V. Tsai, and M. West, 2008. Analysis of seismic waveforms generated during iceberg calving events, Jakobshavn Isbræ, Greenland. AGU Fall Meeting: San Francisco, California. Amundson, J.M., M. Truffer, M. Fahnestock, I. Joughin, M.P. Lü, J. Brown, R.J. Motyka, and D. Podrasky, 2008. Effect of melt on the velocity of the main channel of Jakobshavn Isbræ, Greenland. IGS Symposium on Dynamics in Glaciology: Limerick, Ireland. Amundson, J.M., M. Truffer, M. Fahnestock, M.P. Lüthi, R.J. Motyka, and I. Joughin, 2008. Large calving events, Jakobshavn Isbræ. Annual PARCA meeting: Boulder, Colorado. Amundson, J.M., M. Truffer, R. Motyka, M. Fahnestock, M. Lüthi, and J. Brown, 2007. Large calving events and associated seismicity and ice motion, Jakobshavn Isbræ, West Greenland. Northwest Glaciology Meeting: Portland, Oregon. Amundson, J.M., and M. Truffer, 2006. Glacial respirations and hibernations: Diurnal fluctuations in tiltmeter readings and possible implications for basal conditions. Northwest Glaciology Meeting: Fairbanks, Alaska. Amundson, J.M., M. Truffer, and M.P. Lüthi, 2005. Stress redistribution in a transverse cross-section of Black Rapids Glacier, Alaska. American Geophysical Union Fall Meeting: San Francisco, California. Amundson, J.M., and M. Truffer, 2004. A coupled ice-till flow model of Black Rapids Glacier, Alaska. Northwest Glaciology Meeting: Seattle, Washington. Amundson, J.M., and N.R. Iverson, 2003. Testing a glacial erosion rule using hang heights of Hanging Valleys, Jasper National Park, Canada. Arctic Workshop: Boulder, Colorado. |
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Professional organizations |
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International Glaciological Society American Geophysical Union |
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