Preliminary GNET-derived mass variations for Greenland

Monitoring the Greenland mass balance (GMB) is crucial in the context of
global sea level rise. Currently, three main methods are used to measure
GMB, with the primary source of uncertainty arising from the glacial
isostatic adjustment (GIA) contribution. Here, we propose a novel approach
based on a simple methodology that uses the entire Greenland GNSS network
(GNET) as an instrument to monitor the present-day mass changes. Our
method is validated against GRACE-derived GMB, and we find a very good
agreement. This leads to an independent methodology for estimating
present-day mass changes from GNSS, bridging the gap between GRACE and
GRACE-FO in GMB estimates.