TY - CHAP

T1 - GREENLAND ICE SHEET CHANGES FROM SPACE USING LASER, RADAR AND

AU - Sørensen, Louise Sandberg

AU - Stenseng, Lars

AU - Simonsen, Sebastian Bjerregaard

AU - Forsberg, René

AU - Poulsen, S. K.

AU - Helm, V.

PY - 2010

Y1 - 2010

N2 - The Greenland cryosphere is undergoing rapid changes, and these are documented by remote sensing from space. In this paper, an inversion scheme is used to derive mass changes from gravity changes observed by GRACE, and to derive the mean annual mass loss for the Greenland Ice Sheet, which is estimated to be 204 Gt/yr for the period 2002-2010. NASA’s laser altimetry satellite ICESat has provided elevation estimates of the ice sheet since January 2003. In order to be able to compare GRACE and ICESat derived results, the ICESat volume change must be converted into a mass change estimate. Therefore, it is necessary to model the densities and compaction of the firn. We find that data from ASIRAS show great potential for validating the glaciological models used to determine the densities and firn compaction.

AB - The Greenland cryosphere is undergoing rapid changes, and these are documented by remote sensing from space. In this paper, an inversion scheme is used to derive mass changes from gravity changes observed by GRACE, and to derive the mean annual mass loss for the Greenland Ice Sheet, which is estimated to be 204 Gt/yr for the period 2002-2010. NASA’s laser altimetry satellite ICESat has provided elevation estimates of the ice sheet since January 2003. In order to be able to compare GRACE and ICESat derived results, the ICESat volume change must be converted into a mass change estimate. Therefore, it is necessary to model the densities and compaction of the firn. We find that data from ASIRAS show great potential for validating the glaciological models used to determine the densities and firn compaction.

M3 - Book chapter

BT - Greenland Ice Sheet Changes from Space Using Laser, Radar and Gravity

Y2 - 28 June 2010 through 2 July 2010

ER -