Publications by authors named "Alba Martin-Espanol"
An assessment of forward and inverse GIA solutions for Antarctica.
J Geophys Res Solid Earth
September 2016
Article Synopsis
- This work evaluates recent estimates of glacial isostatic adjustment (GIA) in Antarctica using both forward and inverse methods, comparing them to GPS vertical velocity data from 2009-2014.
- The study identifies systemic underestimations of uplift rates in areas with low mantle viscosities and thin lithosphere, particularly in the northern Antarctic Peninsula and Amundsen Sea Embayment.
- Conversely, it finds overestimation of uplift in regions traditionally seen as maxima for GIA models, leading to increased uncertainty in ice-sheet mass balance calculations derived from gravimetry methods.
We present spatiotemporal mass balance trends for the Antarctic Ice Sheet from a statistical inversion of satellite altimetry, gravimetry, and elastic-corrected GPS data for the period 2003-2013. Our method simultaneously determines annual trends in ice dynamics, surface mass balance anomalies, and a time-invariant solution for glacio-isostatic adjustment while remaining largely independent of forward models. We establish that over the period 2003-2013, Antarctica has been losing mass at a rate of -84 ± 22 Gt yr, with a sustained negative mean trend of dynamic imbalance of -111 ± 13 Gt yr.
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