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Software News

13.03.2007 15:29 Age: 13 Jahre

Arctic glaciers movement

Figure 1: Horizontal displacement from ALOS PALSAR

Figure 2: Horizontal displacement from ALOS PALSAR

Horizontal displacement for Novaya Zemlya from ALOS PALSAR offset tracking between images of December 6, 2006 and January 21, 2007 (Figure 1) and JERS-1 SAR offset tracking between images of January 28 and March 13, 1998 (Figure 2). Background is MODIS imagery from July 29, 2003. Outlet glacier boundaries are after The catalogue of glaciers of the USSR (1978). Glacier names are after World Glacier Inventory (National Snow and Ice Data Center, 1999).

In the area covered by both satellite images, the ice-surface velocities in the marginal part of Kropotnika Glacier measured with JERS-1 SAR in 1998 and ALOS PALSAR in 2007 are similar. Frontal velocity estimates in 44 respectively 46 days are about 120 m/year with expected errors of about ±20 m/year. The marginal part of Shury Glacier shows an increase in ice-surface velocities from 1998 (about 120 m/year measured with JERS-1 SAR) to 2007 (about 160 m/year measured with ALOS PALSAR). The boundaries of outlet glaciers from the catalogue are generally consistent with JERS-1 SAR and ALSO PALSAR offset-tracking results in the lower parts, but the satellite-based ice-surface motion maps show a significantly larger glacier feeding zone in the upper parts.

PALSAR is the L-Band SAR system on the recently launched Japanese ALOS satellite.

Support FP6 EC INTEGRAL project. JERS-1 SAR data courtesy C1P.2611 (SIGMA, P.I. A. Sharov), ALOS PALSAR data courtesy P1750001, © JAXA, processing Gamma Remote Sensing. MODIS images courtesy of MODIS Rapid Response Project at NASA/GSFC.