1998 Fall Meeting
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"G41D-03"

------------------------------
HR: 	0830h
AN: 	G41D-03
TI:  	Surface Morphology of the Central West Antarctic Ice Sheet From 
	Airborne Laser Altimetry
AU: 	Blankenship, D D
EM: 	blank@ig.utexas.edu
AF: 	Institute for Geophysics
	The University of Texas at Austin
	4412 Spicewood Springs Rd #600 Austin, Tx 78759-8500  
AU: 	Bell, R E
EM: 	robinb@ldeo.columbia.edu
AF: 	Lamont Doherty Earth Observatory
	Torrey Cliff Palisades, NY 10964-8000  
AU: 	*Morse, D L
EM: 	morse@ig.utexas.edu
AF: 	Institute for Geophysics
	The University of Texas at Austin
	4412 Spicewood Springs Rd #600 Austin, Tx 78759-8500  
AU: 	Kempf, S D
EM: 	scottk@ig.utexas.edu
AF: 	Institute for Geophysics
	The University of Texas at Austin
	4412 Spicewood Springs Rd #600 Austin, Tx 78759-8500  
AU: 	Arko, R B
EM: 	arko@ldeo.columbia.edu
AF: 	Lamont Doherty Earth Observatory
	Torrey Cliff Palisades, NY 10964-8000  
AU: 	Guillemot, C J
EM: 	chrisg@unavco.ucar.edu
AF: 	UNAVCO/UCAR
	P.O. Box 3000
	 Boulder, Co 80307-3000  
AU: 	Brozena, J M
EM: 	john@hp8c.nrl.navy.mil
AF: 	Naval Research Laboratory
	455 Overlook Ave
	 Washington, DC   
AU: 	Jarvis, J L
EM: 	I:jim@nrl.navy.mil
AF: 	Naval Research Laboratory
	455 Overlook Ave
	 Washington, DC   
AU: 	Childers, V A
EM: 
AF: 	Naval Research Laboratory
	455 Overlook Ave
	 Washington, DC   
AU: 	Hodge, S M
EM: 	smhodge@usgs.gov
AF: 	Naval Research Laboratory
	455 Overlook Ave
	 Washington, DC   
AU: 	Hodge, S M
EM: 	smhodge@usgs.gov
AF: 	USGS
	Ice Dynamics Project Office
	University of Puget Sound
	119 Thompson Hall Tacoma, Wa 98416  
AU: 	Scambos, T A
EM: 	teds@icehouse.colorado.edu
AF: 	National Snow and Ice Data Center
	CIRES  Campus Box 449; 1540 30th St.
	University of Colorado
	 Boulder, Co 80309-0449  

AB:  	The portion of the West Antarctic ice sheet (WAIS)
	encompassing the ice divide separating the Pine Island and
	Ross Embayments and the initiation of ice streams B, C and D
	within the Ross Embayment is an increasing focus for WAIS
	research. Proposed activities include both deep ice coring
	and shallow coring traverses near the divide as well as
	seismological traverses of the ice stream onsets.  Here we
	report on results of the laser altimetry component of two
	aerogeophysical surveys of this region: the first is a
	50,000 line-km survey collected by the CASERTZ (Corridor
	Aerogeophysics of the Interior Ross Embayment) project on a
	5.3 km grid over the onsets of ice streams B and C; the
	second is a 100,000 line-km survey (also on a 5.3 km grid)
	collected by the Support Office for Aerogeophysical Research
	(SOAR) covering ice stream D from the ice divide to the
	grounding line.
	
	Both of these surveys utilized a 900 W (peak-power) pulsed
	laser (23 nsec pulse at 1064 nm) with a 3.5 m footprint (at
	a flight elevation of 500 m).  The average range from the
	aircraft to the ice surface was determined every eight to
	nine meters along the flight path by summing the
	travel-times for 64 laser returns.  These averaged laser
	ranges were ultimately projected to a position on the ice
	surface using aircraft attitude information from an on-board
	laser gyroscope.  The aircraft position was determined
	kinematically using differential carrier phase GPS
	observations made at one-second intervals with multiple
	receivers.  Surface elevations determined with this system
	have single-season uncorrected mean deviations for
	observations made at points of intersecting flight paths
	ranging from 0.13 to 1.3 meters.  These mean deviations are
	reduced to 0.09 m to .37 m after correcting profiles for a
	linear drift in the vertical position of the aircraft.
	
	These new surface elevation data provide a calibration
	surface for space-based altimetry measurements and are a
	benchmark for future ice sheet volume change detection.
	Augmented by satellite imagery, these data also should be
	sufficient for resolving the position of the topographic ice
	divide and boundaries of ice stream initiation with the
	sub-kilometer precision necessary for modeling WAIS
	dynamics.
DE: 	9310  Antarctica
DE: 	1827  Glaciology (1863)
DE: 	1640  Remote sensing
SC: 	G
MN:	1998 Fall Meeting

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