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GEOPHYSICAL RESEARCH LETTERS,
VOL. 30, NO. 13,
1706,
doi:10.1029/2003GL017609,
2003
Timing of Recent Accelerations of Pine Island Glacier, Antarctica
Ian Joughin
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Eric Rignot
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Christine E. Rosanova
Natural Resources Conservation Service, Bozeman, Montana, USA
Baerbel K. Lucchitta
U.S. Geological Survey, Flagstaff, Arizona, USA
Jennifer Bohlander
National Snow and Ice Data Center, University of Colorado, Boulder, Colorado, USA
Abstract
We have used Interferometric Synthetic Aperture Radar (InSAR) data and sequential Landsat imagery to identify and temporally
constrain two acceleration events on Pine Island Glacier (PIG). These two events are separated by a period of at least seven
years (1987–1994). The change in discharge between two flux gates indicates that the majority of the increase in discharge
associated with the second acceleration originates well inland (>80 km) from the grounding line. An analysis indicates that
changes in driving stress consistent with observed thinning rates are sufficient in magnitude to explain much of the acceleration.
Received 24
April
2003;
accepted 5
June
2003;
published 11
July
2003.
Index Terms: 0933 Exploration Geophysics: Remote sensing; 1827 Hydrology: Glaciology (1863); 4556 Oceanography: Physical: Sea level variations; 9310 Information Related to Geographic Region: Antarctica.
Read Full Article (file size: 182830 bytes) Cited by
Citation: Joughin, I., E. Rignot, C. E. Rosanova, B. K. Lucchitta, and J. Bohlander
(2003),
Timing of Recent Accelerations of Pine Island Glacier, Antarctica,
Geophys. Res. Lett.,
30(13),
1706,
doi:10.1029/2003GL017609.
Copyright 2003 by the American Geophysical Union.
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