Ice motion in Antarctica using ALOS PALSAR observations from 2006 and 2007
(1) University of California Irvine, Jet Propulsion Laboratory, Pasadena, United States
The PALSAR interferometric instrument onboard ALOS has collected unique
data in the Antarctic during the first cycles of 2006 and during three
consecutive cycles of 2007. Despite the long repeat cycle of the
satellite, we have successfully employed a speckle tracking technique on
the data which provides ice velocity estimates at an unprecedented
level of accuracy averaged over 46 days. The results have been employed to
reveal a large acceleration of ice on Pine Island Glacier that is
unprecedented in the last 16 years. A comparison with ERs-1 data from
1996 have also revealed the extent of the speed up of the glaciers in this
region for the first time. We have also employed the data in double
interferometry mode to map the grounding line of these glaciers. Again,
due to the exceptional temporal coherence of the data and the fine beam
resolution of PALSAR, we are able to restitute the visibility of
interferometric fringes in double differential mode. On Pine Island
Glacier, the signal is blurred by the ongoing acceleration but suggests
that the grounding line retreat is not as large as suspected. Finally, we
have begun a large scale efforts of ice sheet motion mapping with PALSAR.
The first results on Larsen C ice shelf and Getz ice shelf will be shown,
as well as future plans and recommendations for mission continuation.
This work was conducted at UCI and at JPL under a contract with the
National Aeronautics and Space Administration's Cryosphere Science Program.