Abstract
Abstract. A least squares inversion of satellite laser ranging (SLR) data over
Greenland and Antarctica could extend gravimetry-based estimates of mass loss
back to the early 1990s and fill any future gap between the current Gravity
Recovery and Climate Experiment (GRACE) and the future GRACE Follow-On
mission. The results of a simulation suggest that, while separating the mass
change between Greenland and Antarctica is not possible at the limited
spatial resolution of the SLR data, estimating the total combined mass change
of the two areas is feasible. When the method is applied to real SLR and
GRACE gravity series, we find significantly different estimates of inverted
mass loss. There are large, unpredictable, interannual differences between
the two inverted data types, making us conclude that the current 5×5
spherical harmonic SLR series cannot be used to stand in for GRACE. However,
a comparison with the longer IMBIE time series suggests that on a 20-year
time frame, the inverted SLR series' interannual excursions may average out,
and the long-term mass loss estimate may be reasonable.
Funder
National Aeronautics and Space Administration
Subject
Earth-Surface Processes,Water Science and Technology
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