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Shad O'Neel Title: Research Geophysicist |
Areas of Specialization and/or Research Interests
Ph.D. 2006 Institute of Arctic and Alpine Research, Dept. of Geological Sciences, University of Colorado Boulder Geophysics M.S. 2000 Geophysical Institute, University of Alaska Fairbanks Geophysics B.A. 1997 University of Montana Environmental Geology
Professional ExperienceGlacier-climate interactions and sea level rise: Melting of glaciers and ice-sheets provides the largest eustatic contribution to global sea level rise. Terrestrial glaciers respond to temperature changes, but nonlinear dynamic processes at marine-terminating glaciers are important, yet poorly constrained. Such dynamic instabilities allow rapid flow and even faster iceberg calving, complicating estimates of sea level contributions.
Small glaciers: The world’s glaciers and ice caps, not the great ice sheets, are changing most rapidly and will have the largest and most immediate impact on Earth’s population.
Glacier-generated seismicity: Information pertaining to both flow and calving are stored in the seismograms produced by glaciers, yet these signals are poorly understood. Automatic event detection and time-series development, analysis of site and path effects, frequency-magnitude distributions are underway and serve to clarify the source physics of iceberg calving.
Photogrammetry: Dynamical information can be extracted from images acquired from spaceborne, airborne and terrestrial photography. Time-lapse sequences provide robust time series of change, and I am working on automatic processing algorithms to streamline data acquisition.
Professional Activities and/or Memberships
2007 - 2008 Postdoctoral Scholar, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, UC San Diego 2007 - 2008 Geophysical Institute, University of Alaska Fairbanks 2007 Lecturer at University of Colorado Boulder, graduate level glaciology 2001 - 2003 Geodetic Engineer at UNAVCO in Boulder, CO; Assisted NSF research projects with GPS deployment and data processing as a Glacier GPS specialist.
Significant Recent PublicationsAffiliate of University of Colorado Boulder’s Institute of Arctic and Alpine Research (INSTAAR)
American Geophysical Union
International Glaciological Society
Websites of InterestPfeffer, W.T., J.T Harper, S O’Neel (in press), Kinematic constraints on glacier and land ice contributions to 21st century sea level rise, Science, 2008.
O’Neel S. and W.T. Pfeffer (2007), Source mechanisms for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK, Geophys. Res. Lttrs., 2007.
M. F. Meier, M. B. Dyurgerov, U. K. Rick, S. O’Neel, W. T. Pfeffer, R. S. Anderson, S.P. Anderson and A.F. Glazovsky (2007), Glaciers dominate eustatic sea-level rise in the 21st century, Science, 317(5841), 1064-1067, doi: 10.1126/science.1143906.
O’Neel S., H.P. Marshall, D.E. McNamara and W.T. Pfeffer (2007), Detection and analysis of icequakes at Columbia Glacier, AK, Jour. Geophys. Res., 112, F02S13, doi: 10.1029/2006JF000595.
Harper, J. T., N. F. Humphrey, W.T. Pfeffer, T. Fudge and S. O’Neel (2005), Evolution of subglacial water pressure along a glacier’s length, Ann. Glaciol., 40, 31-36.
O'Neel S., W.T. Pfeffer, R.M. Krimmel and M.F. Meier (2005), Evolving force balance at Columbia Glacier, during its rapid retreat, Jour. Geophys. Res., 110, F03012, doi: 10.1029/2005JF000292.
Anderson, R.S., S.P. Anderson, K.R. MacGregor, S. O’Neel, C.A. Riihimaki, E.D. Waddington and M.G. Loso (2004), Strong feedbacks between hydrology and sliding of a small alpine glacier, Jour. Geophys. Res., 109, F03005.
O’Neel, S., K.A. Echelmeyer and R.J. Motyka (2003), Short-term variations in calving of a tidewater glacier: LeConte Glacier, Alaska. J. Glaciol., 49(167), 587-598.
Motyka R.J., S. O'Neel, C.L. Connor and K.A. Echelmeyer (2003), Twentieth century thinning of Mendenhall Glacier, Alaska, and its relationship to climate, lake calving, and glacier run-off, Global and Planetary Change, 35 (1-2): 93-112.
O'Neel S., K.A. Echelmeyer and R.J. Motyka (2001), Short-term flow dynamics of a retreating tidewater glacier: LeConte Glacier, Alaska, USA J. Glaciol. 47 (159): 567-578.
http://ak.water.usgs.gov/glaciology/
http://tintin.colorado.edu/
http://fairweather.gps.alaska.edu/chris/
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