Long-term mass variations of Greenland and Antarctica from low-degree Stokes gravity field
Abstract
Thanks to the GRACE and GRACE-FO missions, surface mass variations of the major ice shelves are routinely monitored since 2002 at monthly timescales with horizontal resolutions of a few hundreds of kilometers.
Low degree gravity coefficients can also be retrieved from tracking satellites using SLR (Satellite Laser Ranging) and DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellites) techniques since 1992. Using a mascon approach, we derive estimates bi-weekly Greenland and Antarctica mass variations from 1992 to 2019. The solutions we present are derived from a complete reprocessing of all the SLR & DORIS data, using updated nonconservative force modeling, better troposphere refraction corrections for the DORIS data, application of the IERS2014 linear mean pole, and use throughout the time series of the GFZ-supplied 3-hrly AOD files provided for GRACE RL06 processing. We compare our estimates to GRACE and GRACE-FO solutions for the 2003-2019 period and show SLR and DORIS derived estimates can be used to consistently monitor long term mass variations over nearly three decades. We also compare our time series to long-term estimates from radar altimetry measurements and mass-balance models. We also compute vertical displacements from permanent GNSS stations using the PPP approach, allowing to independently provide estimates of present-day ice mass variations and GIA parameters.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.G53C0635B
- Keywords:
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- 1218 Mass balance;
- GEODESY AND GRAVITY;
- 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions;
- GEODESY AND GRAVITY;
- 1225 Global change from geodesy;
- GEODESY AND GRAVITY;
- 1655 Water cycles;
- GLOBAL CHANGE