Short term mass variability in Greenland, from GRACE


Contact
phuybrechts [ at ] awi-bremerhaven.de

Abstract

We use twenty-two monthly GRACE (GravityRecovery and Climate Experiment) gravity fields to recover nonsecular mass change in Greenland. The results show large seasonal variability. We compare withmodeled precipitation, evaporation, and runoff derived from ERA40 (the 40-year ECMWF Re-Analysis of the global atmosphere). The models seasonal amplitude is controlled by runoff and agrees reasonably well with GRACE. Both GRACE and the model show an April/Maymaximum. But the GRACE results show a delayed minimum relative to the model. This difference is probably associated with omissions in the runoff model, ice discharge, subglacial hydrology, mass loss by blowing snow, and hydrology in ice-free regions. The discrepancy is smaller, but still significant, for south Greenland alone. When we include a proxy for ice discharge the agreementis improved.



Item Type
Article
Authors
Divisions
Programs
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
11761
DOI 10.1029/2004GL021948

Cite as
Velicogna, I. , Wahr, J. , Hanna, E. and Huybrechts, P. (2005): Short term mass variability in Greenland, from GRACE , Geophysical Research Letters, 32, L05501 . doi: 10.1029/2004GL021948


Download
[img]
Preview
PDF (Fulltext)
Vel2005a.pdf

Download (113kB) | Preview
Cite this document as:

Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item