Journal article
Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change
Ohio State University1
University of Colorado2
National Space Institute, Technical University of Denmark3
Geodesy, National Space Institute, Technical University of Denmark4
Cornell University5
University of Luxembourg6
UNAVCO, Inc.7
Polar Field Services8
Geodynamics, National Space Institute, Technical University of Denmark9
The Greenland GPS Network (GNET) uses the Global Positioning System (GPS) to measure the displacement of bedrock exposed near the margins of the Greenland ice sheet. The entire network is uplifting in response to past and present-day changes in ice mass. Crustal displacement is largely accounted for by an annual oscillation superimposed on a sustained trend.
The oscillation is driven by earth’s elastic response to seasonal variations in ice mass and air mass (i.e., atmospheric pressure). Observed vertical velocities are higher and often much higher than predicted rates of postglacial rebound (PGR), implying that uplift is usually dominated by the solid earth’s instantaneous elastic response to contemporary losses in ice mass rather than PGR.
Superimposed on longer-term trends, an anomalous ‘pulse’ of uplift accumulated at many GNET stations during an approximate six-month period in 2010. This anomalous uplift is spatially correlated with the 2010 melting day anomaly.
| Language: | English |
|---|---|
| Publisher: | National Academy of Sciences |
| Year: | 2012 |
| Pages: | 11944-11948 |
| ISSN: | 10916490 and 00278424 |
| Types: | Journal article |
| DOI: | 10.1073/pnas.1204664109 |
| ORCIDs: | Khan, Shfaqat Abbas , Knudsen, Per and Forsberg, René |
