Antarctic Ice Mass Change
We provide time series of storage variations in gigatons (Gt) for 25 major drainage basins of the Antarctic ice sheet. Empirical uncertainty estimates are included. The basin definition follows Sasgen et al. (2013), and will be made available as a separate file. The inversion method adjusts an a priori distribution of mass change (forward model) to the GRACE data by the method of least squares.
In addition, a gridded product is provided based on the processing standards used for generating ESA CCI ice sheet products (Groh & Horwath, 2016). This product is provided in terms of mass changes per surface area (kg/m²). At the basin level, both data sets agree within the monthly GRACE uncertainty.
The Glacial Isostatic Adjustment (GIA) correction applied is ICE-5G / VM2 (click here for more details ). Alternative GIA corrections are under development by the processing team and will be provided alongside the ice products in due course.
Sasgen, I., Konrad, H., Ivins, E.R., Van den Broeke, M.R., Bamber, J.L., Martinec, Z., Klemann, V., 2013:
Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates
The Cryosphere, 7, p. 1499—1512 , https://doi.org/10.5194/tc-7-1499-2013
Groh, A., Horwath, M., 2016:
The method of tailored sensitivity kernels for GRACE mass change estimates
Geophysical Research Abstracts, 18, EGU2016-12065