Assessing Greenland ice mass loss by means of point-mass modeling: a viable methodology |
| |
Authors: | Oliver Baur Nico Sneeuw |
| |
Institution: | 1.Institute of Geodesy,University of Stuttgart,Stuttgart,Germany;2.Space Research Institute,Austrian Academy of Sciences,Graz,Austria |
| |
Abstract: | Greenland ice mass loss is one of the most serious phenomena of present-day global climate change. In this context, both the
quantification of overall deglaciation rates and its spatial localization are highly significant. We have thoroughly investigated
the technique of point-mass modeling in order to derive mass-balance patterns from GRACE (Gravity Recovery And Climate Experiment)
gravimetry. The method infers mass variations on the Earth’s surface from gravitational signals at satellite altitude. In
order to solve for point-mass changes, we applied least-squares adjustment. Due to downward continuation, numerical stabilization
of the inversion process gains particular significance. We stabilized the ill-posed problem by Tikhonov regularization. Our
simulation and real data experiments show that point-mass modeling provides both rational deglaciation rates and high-resolution
spatial mass variation patterns. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|