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Velocities of Pine Island and Thwaites glaciers, West Antarctica, from ERS-1 SAR imagesAverage velocities of Pine Island and Thwaites glaciers (West Antarctica) were measured for the time periods between 1992 and 1994 by tracking ice-surface patterns. Velocities of the central flow of the Pine Island glacier range from 1.5 km/yr above the grounding line (separating the grounded from the floating parts of a glacier) to 2.8 km/yr near the terminus; velocities of the central Thwaites glacier range from 2.2 km/yr above the grounding line to 3.4 km/yr at the limit of measurements on the tongue. Both glaciers show an increase in velocity of about 1 km/yr where they cross their grounding lines. The velocities derived from ERS-1 images are higher than those previously derived from Landsat images, perhaps reflecting acceleration of the glaciers. Both glaciers are exceptionally fast. The high velocities may be due to high precipitation rates over West Antarctica and the lack of a major buttressing ice shelf.
Document ID
19990078370
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Lucchita, Baerbel K.
(Geological Survey Flagstaff, AZ United States)
Rosanova, Christine E.
(Geological Survey Flagstaff, AZ United States)
Date Acquired
August 19, 2013
Publication Date
May 1, 1997
Publication Information
Publication: Proceedings of the 3rd ERS Symposium on Space at the Service of Our Environment
Volume: 2
Subject Category
Earth Resources And Remote Sensing
Distribution Limits
Public
Copyright
Other
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